1 13b2bc37 2022-10-23 stsp /*
   2 13b2bc37 2022-10-23 stsp  * Copyright (c) 2022 Stefan Sperling <stsp@openbsd.org>
   3 13b2bc37 2022-10-23 stsp  *
   4 13b2bc37 2022-10-23 stsp  * Permission to use, copy, modify, and distribute this software for any
   5 13b2bc37 2022-10-23 stsp  * purpose with or without fee is hereby granted, provided that the above
   6 13b2bc37 2022-10-23 stsp  * copyright notice and this permission notice appear in all copies.
   7 13b2bc37 2022-10-23 stsp  *
   8 13b2bc37 2022-10-23 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9 13b2bc37 2022-10-23 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10 13b2bc37 2022-10-23 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11 13b2bc37 2022-10-23 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12 13b2bc37 2022-10-23 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13 13b2bc37 2022-10-23 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14 13b2bc37 2022-10-23 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15 13b2bc37 2022-10-23 stsp  */
  16 13b2bc37 2022-10-23 stsp 
  17 13b2bc37 2022-10-23 stsp #include <sys/types.h>
  18 13b2bc37 2022-10-23 stsp #include <sys/queue.h>
  19 13b2bc37 2022-10-23 stsp #include <sys/uio.h>
  20 13b2bc37 2022-10-23 stsp 
  21 13b2bc37 2022-10-23 stsp #include <errno.h>
  22 13b2bc37 2022-10-23 stsp #include <event.h>
  23 13b2bc37 2022-10-23 stsp #include <poll.h>
  24 13b2bc37 2022-10-23 stsp #include <limits.h>
  25 13b2bc37 2022-10-23 stsp #include <sha1.h>
  26 69c6accf 2023-02-04 op #include <sha2.h>
  27 13b2bc37 2022-10-23 stsp #include <stdio.h>
  28 13b2bc37 2022-10-23 stsp #include <stdint.h>
  29 13b2bc37 2022-10-23 stsp #include <stdlib.h>
  30 13b2bc37 2022-10-23 stsp #include <string.h>
  31 13b2bc37 2022-10-23 stsp #include <imsg.h>
  32 13b2bc37 2022-10-23 stsp #include <unistd.h>
  33 13b2bc37 2022-10-23 stsp 
  34 13b2bc37 2022-10-23 stsp #include "got_error.h"
  35 13b2bc37 2022-10-23 stsp #include "got_serve.h"
  36 13b2bc37 2022-10-23 stsp #include "got_path.h"
  37 13b2bc37 2022-10-23 stsp #include "got_version.h"
  38 13b2bc37 2022-10-23 stsp #include "got_reference.h"
  39 13b2bc37 2022-10-23 stsp 
  40 13b2bc37 2022-10-23 stsp #include "got_lib_pkt.h"
  41 13b2bc37 2022-10-23 stsp #include "got_lib_dial.h"
  42 13b2bc37 2022-10-23 stsp #include "got_lib_gitproto.h"
  43 1362b0e3 2023-02-04 op #include "got_lib_hash.h"
  44 13b2bc37 2022-10-23 stsp #include "got_lib_poll.h"
  45 13b2bc37 2022-10-23 stsp 
  46 13b2bc37 2022-10-23 stsp #include "gotd.h"
  47 13b2bc37 2022-10-23 stsp 
  48 13b2bc37 2022-10-23 stsp #ifndef nitems
  49 13b2bc37 2022-10-23 stsp #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
  50 13b2bc37 2022-10-23 stsp #endif
  51 13b2bc37 2022-10-23 stsp 
  52 13b2bc37 2022-10-23 stsp static const struct got_capability read_capabilities[] = {
  53 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_AGENT, "got/" GOT_VERSION_STR },
  54 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_OFS_DELTA, NULL },
  55 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_SIDE_BAND_64K, NULL },
  56 13b2bc37 2022-10-23 stsp };
  57 13b2bc37 2022-10-23 stsp 
  58 13b2bc37 2022-10-23 stsp static const struct got_capability write_capabilities[] = {
  59 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_AGENT, "got/" GOT_VERSION_STR },
  60 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_OFS_DELTA, NULL },
  61 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_REPORT_STATUS, NULL },
  62 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_NO_THIN, NULL },
  63 13b2bc37 2022-10-23 stsp 	{ GOT_CAPA_DELETE_REFS, NULL },
  64 13b2bc37 2022-10-23 stsp };
  65 13b2bc37 2022-10-23 stsp 
  66 9aeaf23a 2023-01-22 op const struct got_error *
  67 9aeaf23a 2023-01-22 op got_serve_parse_command(char **command, char **repo_path, const char *gitcmd)
  68 13b2bc37 2022-10-23 stsp {
  69 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
  70 13b2bc37 2022-10-23 stsp 	size_t len, cmdlen, pathlen;
  71 13b2bc37 2022-10-23 stsp 	char *path0 = NULL, *path, *abspath = NULL, *canonpath = NULL;
  72 13b2bc37 2022-10-23 stsp 	const char *relpath;
  73 13b2bc37 2022-10-23 stsp 
  74 13b2bc37 2022-10-23 stsp 	*command = NULL;
  75 13b2bc37 2022-10-23 stsp 	*repo_path = NULL;
  76 13b2bc37 2022-10-23 stsp 
  77 13b2bc37 2022-10-23 stsp 	len = strlen(gitcmd);
  78 13b2bc37 2022-10-23 stsp 
  79 13b2bc37 2022-10-23 stsp 	if (len >= strlen(GOT_SERVE_CMD_SEND) &&
  80 13b2bc37 2022-10-23 stsp 	    strncmp(gitcmd, GOT_SERVE_CMD_SEND,
  81 13b2bc37 2022-10-23 stsp 	    strlen(GOT_SERVE_CMD_SEND)) == 0)
  82 13b2bc37 2022-10-23 stsp 		cmdlen = strlen(GOT_SERVE_CMD_SEND);
  83 13b2bc37 2022-10-23 stsp 	else if (len >= strlen(GOT_SERVE_CMD_FETCH) &&
  84 13b2bc37 2022-10-23 stsp 	    strncmp(gitcmd, GOT_SERVE_CMD_FETCH,
  85 13b2bc37 2022-10-23 stsp 	    strlen(GOT_SERVE_CMD_FETCH)) == 0)
  86 13b2bc37 2022-10-23 stsp 		cmdlen = strlen(GOT_SERVE_CMD_FETCH);
  87 13b2bc37 2022-10-23 stsp 	else
  88 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_PACKET);
  89 13b2bc37 2022-10-23 stsp 
  90 13b2bc37 2022-10-23 stsp 	if (len <= cmdlen + 1 || gitcmd[cmdlen] != ' ')
  91 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_PACKET);
  92 13b2bc37 2022-10-23 stsp 
  93 13b2bc37 2022-10-23 stsp 	if (memchr(&gitcmd[cmdlen + 1], '\0', len - cmdlen) == NULL)
  94 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_PATH);
  95 13b2bc37 2022-10-23 stsp 
  96 13b2bc37 2022-10-23 stsp 	/* Forbid linefeeds in paths, like Git does. */
  97 13b2bc37 2022-10-23 stsp 	if (memchr(&gitcmd[cmdlen + 1], '\n', len - cmdlen) != NULL)
  98 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_PATH);
  99 13b2bc37 2022-10-23 stsp 
 100 13b2bc37 2022-10-23 stsp 	path0 = strdup(&gitcmd[cmdlen + 1]);
 101 13b2bc37 2022-10-23 stsp 	if (path0 == NULL)
 102 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("strdup");
 103 13b2bc37 2022-10-23 stsp 	path = path0;
 104 13b2bc37 2022-10-23 stsp 	pathlen = strlen(path);
 105 13b2bc37 2022-10-23 stsp 
 106 13b2bc37 2022-10-23 stsp 	/*
 107 13b2bc37 2022-10-23 stsp 	 * Git clients send a shell command.
 108 13b2bc37 2022-10-23 stsp 	 * Trim spaces and quotes around the path.
 109 13b2bc37 2022-10-23 stsp 	 */
 110 13b2bc37 2022-10-23 stsp 	while (path[0] == '\'' || path[0] == '\"' || path[0] == ' ') {
 111 13b2bc37 2022-10-23 stsp 		path++;
 112 13b2bc37 2022-10-23 stsp 		pathlen--;
 113 13b2bc37 2022-10-23 stsp 	}
 114 13b2bc37 2022-10-23 stsp 	while (pathlen > 0 &&
 115 13b2bc37 2022-10-23 stsp 	    (path[pathlen - 1] == '\'' || path[pathlen - 1] == '\"' ||
 116 13b2bc37 2022-10-23 stsp 	    path[pathlen - 1] == ' ')) {
 117 13b2bc37 2022-10-23 stsp 		path[pathlen - 1] = '\0';
 118 13b2bc37 2022-10-23 stsp 		pathlen--;
 119 13b2bc37 2022-10-23 stsp 	}
 120 13b2bc37 2022-10-23 stsp 
 121 13b2bc37 2022-10-23 stsp 	/* Deny an empty repository path. */
 122 13b2bc37 2022-10-23 stsp 	if (path[0] == '\0' || got_path_is_root_dir(path)) {
 123 13b2bc37 2022-10-23 stsp 		err = got_error(GOT_ERR_NOT_GIT_REPO);
 124 13b2bc37 2022-10-23 stsp 		goto done;
 125 13b2bc37 2022-10-23 stsp 	}
 126 13b2bc37 2022-10-23 stsp 
 127 13b2bc37 2022-10-23 stsp 	if (asprintf(&abspath, "/%s", path) == -1) {
 128 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("asprintf");
 129 13b2bc37 2022-10-23 stsp 		goto done;
 130 13b2bc37 2022-10-23 stsp 	}
 131 13b2bc37 2022-10-23 stsp 	pathlen = strlen(abspath);
 132 13b2bc37 2022-10-23 stsp 	canonpath = malloc(pathlen);
 133 13b2bc37 2022-10-23 stsp 	if (canonpath == NULL) {
 134 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("malloc");
 135 13b2bc37 2022-10-23 stsp 		goto done;
 136 13b2bc37 2022-10-23 stsp 	}
 137 13b2bc37 2022-10-23 stsp 	err = got_canonpath(abspath, canonpath, pathlen);
 138 13b2bc37 2022-10-23 stsp 	if (err)
 139 13b2bc37 2022-10-23 stsp 		goto done;
 140 13b2bc37 2022-10-23 stsp 
 141 13b2bc37 2022-10-23 stsp 	relpath = canonpath;
 142 13b2bc37 2022-10-23 stsp 	while (relpath[0] == '/')
 143 13b2bc37 2022-10-23 stsp 		relpath++;
 144 13b2bc37 2022-10-23 stsp 	*repo_path = strdup(relpath);
 145 13b2bc37 2022-10-23 stsp 	if (*repo_path == NULL) {
 146 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("strdup");
 147 13b2bc37 2022-10-23 stsp 		goto done;
 148 13b2bc37 2022-10-23 stsp 	}
 149 13b2bc37 2022-10-23 stsp 	*command = strndup(gitcmd, cmdlen);
 150 13b2bc37 2022-10-23 stsp 	if (*command == NULL)
 151 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("strndup");
 152 13b2bc37 2022-10-23 stsp done:
 153 13b2bc37 2022-10-23 stsp 	free(path0);
 154 13b2bc37 2022-10-23 stsp 	free(abspath);
 155 13b2bc37 2022-10-23 stsp 	free(canonpath);
 156 13b2bc37 2022-10-23 stsp 	if (err) {
 157 13b2bc37 2022-10-23 stsp 		free(*repo_path);
 158 13b2bc37 2022-10-23 stsp 		*repo_path = NULL;
 159 13b2bc37 2022-10-23 stsp 	}
 160 13b2bc37 2022-10-23 stsp 	return err;
 161 13b2bc37 2022-10-23 stsp }
 162 13b2bc37 2022-10-23 stsp 
 163 13b2bc37 2022-10-23 stsp static const struct got_error *
 164 13b2bc37 2022-10-23 stsp append_read_capabilities(size_t *capalen, size_t len, const char *symrefstr,
 165 13b2bc37 2022-10-23 stsp     uint8_t *buf, size_t bufsize)
 166 13b2bc37 2022-10-23 stsp {
 167 13b2bc37 2022-10-23 stsp 	struct got_capability capa[nitems(read_capabilities) + 1];
 168 13b2bc37 2022-10-23 stsp 	size_t ncapa;
 169 13b2bc37 2022-10-23 stsp 
 170 13b2bc37 2022-10-23 stsp 	memcpy(&capa, read_capabilities, sizeof(read_capabilities));
 171 13b2bc37 2022-10-23 stsp 	if (symrefstr) {
 172 13b2bc37 2022-10-23 stsp 		capa[nitems(read_capabilities)].key = "symref";
 173 13b2bc37 2022-10-23 stsp 		capa[nitems(read_capabilities)].value = symrefstr;
 174 13b2bc37 2022-10-23 stsp 		ncapa = nitems(capa);
 175 13b2bc37 2022-10-23 stsp 	} else
 176 13b2bc37 2022-10-23 stsp 		ncapa = nitems(read_capabilities);
 177 13b2bc37 2022-10-23 stsp 
 178 13b2bc37 2022-10-23 stsp 	return got_gitproto_append_capabilities(capalen, buf, len,
 179 13b2bc37 2022-10-23 stsp 	    bufsize, capa, ncapa);
 180 13b2bc37 2022-10-23 stsp }
 181 13b2bc37 2022-10-23 stsp 
 182 13b2bc37 2022-10-23 stsp static const struct got_error *
 183 13b2bc37 2022-10-23 stsp send_ref(int outfd, uint8_t *id, const char *refname, int send_capabilities,
 184 13b2bc37 2022-10-23 stsp     int client_is_reading, const char *symrefstr, int chattygot)
 185 13b2bc37 2022-10-23 stsp {
 186 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 187 13b2bc37 2022-10-23 stsp 	char hex[SHA1_DIGEST_STRING_LENGTH];
 188 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
 189 13b2bc37 2022-10-23 stsp 	size_t len, capalen = 0;
 190 13b2bc37 2022-10-23 stsp 
 191 758dc042 2022-11-06 stsp 	if (got_sha1_digest_to_str(id, hex, sizeof(hex)) == NULL)
 192 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_OBJ_ID);
 193 13b2bc37 2022-10-23 stsp 
 194 13b2bc37 2022-10-23 stsp 	len = snprintf(buf, sizeof(buf), "%s %s", hex, refname);
 195 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf))
 196 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_NO_SPACE);
 197 13b2bc37 2022-10-23 stsp 
 198 13b2bc37 2022-10-23 stsp 	if (send_capabilities) {
 199 13b2bc37 2022-10-23 stsp 		if (client_is_reading) {
 200 13b2bc37 2022-10-23 stsp 			err = append_read_capabilities(&capalen, len,
 201 13b2bc37 2022-10-23 stsp 			    symrefstr, buf, sizeof(buf));
 202 13b2bc37 2022-10-23 stsp 		} else {
 203 13b2bc37 2022-10-23 stsp 			err = got_gitproto_append_capabilities(&capalen,
 204 13b2bc37 2022-10-23 stsp 			    buf, len, sizeof(buf), write_capabilities,
 205 13b2bc37 2022-10-23 stsp 			    nitems(write_capabilities));
 206 13b2bc37 2022-10-23 stsp 		}
 207 13b2bc37 2022-10-23 stsp 		if (err)
 208 13b2bc37 2022-10-23 stsp 			return err;
 209 13b2bc37 2022-10-23 stsp 		len += capalen;
 210 13b2bc37 2022-10-23 stsp 	}
 211 13b2bc37 2022-10-23 stsp 
 212 13b2bc37 2022-10-23 stsp 	if (len + 1 >= sizeof(buf))
 213 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_NO_SPACE);
 214 13b2bc37 2022-10-23 stsp 	buf[len] = '\n';
 215 13b2bc37 2022-10-23 stsp 	len++;
 216 13b2bc37 2022-10-23 stsp 	buf[len] = '\0';
 217 13b2bc37 2022-10-23 stsp 
 218 13b2bc37 2022-10-23 stsp 	return got_pkt_writepkt(outfd, buf, len, chattygot);
 219 13b2bc37 2022-10-23 stsp }
 220 13b2bc37 2022-10-23 stsp 
 221 13b2bc37 2022-10-23 stsp static const struct got_error *
 222 2ff9f081 2022-11-08 stsp send_zero_refs(int outfd, int client_is_reading, int chattygot)
 223 13b2bc37 2022-10-23 stsp {
 224 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 225 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
 226 13b2bc37 2022-10-23 stsp 	uint8_t zero[SHA1_DIGEST_LENGTH];
 227 13b2bc37 2022-10-23 stsp 	char hex[SHA1_DIGEST_STRING_LENGTH];
 228 13b2bc37 2022-10-23 stsp 	size_t len, capalen = 0;
 229 13b2bc37 2022-10-23 stsp 
 230 13b2bc37 2022-10-23 stsp 	memset(&zero, 0, sizeof(zero));
 231 13b2bc37 2022-10-23 stsp 
 232 758dc042 2022-11-06 stsp 	if (got_sha1_digest_to_str(zero, hex, sizeof(hex)) == NULL)
 233 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_OBJ_ID);
 234 13b2bc37 2022-10-23 stsp 
 235 13b2bc37 2022-10-23 stsp 	len = snprintf(buf, sizeof(buf), "%s capabilities^{}", hex);
 236 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf))
 237 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_NO_SPACE);
 238 13b2bc37 2022-10-23 stsp 
 239 2ff9f081 2022-11-08 stsp 	if (client_is_reading) {
 240 2ff9f081 2022-11-08 stsp 		err = got_gitproto_append_capabilities(&capalen, buf, len,
 241 2ff9f081 2022-11-08 stsp 		    sizeof(buf), read_capabilities, nitems(read_capabilities));
 242 2ff9f081 2022-11-08 stsp 		if (err)
 243 2ff9f081 2022-11-08 stsp 			return err;
 244 2ff9f081 2022-11-08 stsp 	} else {
 245 2ff9f081 2022-11-08 stsp 		err = got_gitproto_append_capabilities(&capalen, buf, len,
 246 2ff9f081 2022-11-08 stsp 		    sizeof(buf), write_capabilities,
 247 2ff9f081 2022-11-08 stsp 		    nitems(write_capabilities));
 248 2ff9f081 2022-11-08 stsp 		if (err)
 249 2ff9f081 2022-11-08 stsp 			return err;
 250 2ff9f081 2022-11-08 stsp 	}
 251 13b2bc37 2022-10-23 stsp 
 252 c6b5adb8 2022-11-07 stsp 	return got_pkt_writepkt(outfd, buf, len + capalen, chattygot);
 253 13b2bc37 2022-10-23 stsp }
 254 13b2bc37 2022-10-23 stsp 
 255 13b2bc37 2022-10-23 stsp static void
 256 13b2bc37 2022-10-23 stsp echo_error(const struct got_error *err, int outfd, int chattygot)
 257 13b2bc37 2022-10-23 stsp {
 258 13b2bc37 2022-10-23 stsp 	char buf[4 + GOT_ERR_MAX_MSG_SIZE];
 259 13b2bc37 2022-10-23 stsp 	size_t len;
 260 13b2bc37 2022-10-23 stsp 
 261 13b2bc37 2022-10-23 stsp 	/*
 262 13b2bc37 2022-10-23 stsp 	 * Echo the error to the client on a pkt-line.
 263 13b2bc37 2022-10-23 stsp 	 * The client should then terminate its session.
 264 13b2bc37 2022-10-23 stsp 	 */
 265 13b2bc37 2022-10-23 stsp 	buf[0] = 'E'; buf[1] = 'R'; buf[2] = 'R'; buf[3] = ' '; buf[4] = '\0';
 266 13b2bc37 2022-10-23 stsp 	len = strlcat(buf, err->msg, sizeof(buf));
 267 d10629e6 2022-12-08 stsp 	got_pkt_writepkt(outfd, buf, len, chattygot);
 268 13b2bc37 2022-10-23 stsp }
 269 13b2bc37 2022-10-23 stsp 
 270 13b2bc37 2022-10-23 stsp static const struct got_error *
 271 13b2bc37 2022-10-23 stsp announce_refs(int outfd, struct imsgbuf *ibuf, int client_is_reading,
 272 13b2bc37 2022-10-23 stsp     const char *repo_path, int chattygot)
 273 13b2bc37 2022-10-23 stsp {
 274 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 275 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 276 13b2bc37 2022-10-23 stsp 	size_t datalen;
 277 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_list_refs lsref;
 278 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_reflist ireflist;
 279 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_ref iref;
 280 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_symref isymref;
 281 13b2bc37 2022-10-23 stsp 	size_t nrefs = 0;
 282 13b2bc37 2022-10-23 stsp 	int have_nrefs = 0, sent_capabilities = 0;
 283 13b2bc37 2022-10-23 stsp 	char *symrefname = NULL, *symreftarget = NULL, *symrefstr = NULL;
 284 13b2bc37 2022-10-23 stsp 	char *refname = NULL;
 285 13b2bc37 2022-10-23 stsp 
 286 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
 287 13b2bc37 2022-10-23 stsp 	memset(&lsref, 0, sizeof(lsref));
 288 13b2bc37 2022-10-23 stsp 
 289 13b2bc37 2022-10-23 stsp 	if (strlcpy(lsref.repo_name, repo_path, sizeof(lsref.repo_name)) >=
 290 13b2bc37 2022-10-23 stsp 	    sizeof(lsref.repo_name))
 291 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_NO_SPACE);
 292 13b2bc37 2022-10-23 stsp 	lsref.client_is_reading = client_is_reading;
 293 a2c12f7b 2023-01-27 op 
 294 13b2bc37 2022-10-23 stsp 	if (imsg_compose(ibuf, GOTD_IMSG_LIST_REFS, 0, 0, -1,
 295 13b2bc37 2022-10-23 stsp 	    &lsref, sizeof(lsref)) == -1)
 296 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_compose LIST_REFS");
 297 13b2bc37 2022-10-23 stsp 
 298 13b2bc37 2022-10-23 stsp 	err = gotd_imsg_flush(ibuf);
 299 13b2bc37 2022-10-23 stsp 	if (err)
 300 13b2bc37 2022-10-23 stsp 		return err;
 301 13b2bc37 2022-10-23 stsp 
 302 13b2bc37 2022-10-23 stsp 	while (!have_nrefs || nrefs > 0) {
 303 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
 304 13b2bc37 2022-10-23 stsp 		if (err)
 305 13b2bc37 2022-10-23 stsp 			goto done;
 306 13b2bc37 2022-10-23 stsp 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
 307 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
 308 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
 309 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
 310 13b2bc37 2022-10-23 stsp 			goto done;
 311 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_REFLIST:
 312 13b2bc37 2022-10-23 stsp 			if (have_nrefs || nrefs > 0) {
 313 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
 314 13b2bc37 2022-10-23 stsp 				goto done;
 315 13b2bc37 2022-10-23 stsp 			}
 316 13b2bc37 2022-10-23 stsp 			if (datalen != sizeof(ireflist)) {
 317 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
 318 13b2bc37 2022-10-23 stsp 				goto done;
 319 13b2bc37 2022-10-23 stsp 			}
 320 13b2bc37 2022-10-23 stsp 			memcpy(&ireflist, imsg.data, sizeof(ireflist));
 321 13b2bc37 2022-10-23 stsp 			nrefs = ireflist.nrefs;
 322 13b2bc37 2022-10-23 stsp 			have_nrefs = 1;
 323 13b2bc37 2022-10-23 stsp 			if (nrefs == 0)
 324 2ff9f081 2022-11-08 stsp 				err = send_zero_refs(outfd, client_is_reading,
 325 2ff9f081 2022-11-08 stsp 				    chattygot);
 326 13b2bc37 2022-10-23 stsp 			break;
 327 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_REF:
 328 13b2bc37 2022-10-23 stsp 			if (!have_nrefs || nrefs == 0) {
 329 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
 330 13b2bc37 2022-10-23 stsp 				goto done;
 331 13b2bc37 2022-10-23 stsp 			}
 332 13b2bc37 2022-10-23 stsp 			if (datalen < sizeof(iref)) {
 333 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
 334 13b2bc37 2022-10-23 stsp 				goto done;
 335 13b2bc37 2022-10-23 stsp 			}
 336 13b2bc37 2022-10-23 stsp 			memcpy(&iref, imsg.data, sizeof(iref));
 337 13b2bc37 2022-10-23 stsp 			if (datalen != sizeof(iref) + iref.name_len) {
 338 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_LEN);
 339 13b2bc37 2022-10-23 stsp 				goto done;
 340 13b2bc37 2022-10-23 stsp 			}
 341 00b3e9ae 2023-01-11 op 			refname = strndup(imsg.data + sizeof(iref),
 342 00b3e9ae 2023-01-11 op 			    iref.name_len);
 343 13b2bc37 2022-10-23 stsp 			if (refname == NULL) {
 344 00b3e9ae 2023-01-11 op 				err = got_error_from_errno("strndup");
 345 13b2bc37 2022-10-23 stsp 				goto done;
 346 13b2bc37 2022-10-23 stsp 			}
 347 13b2bc37 2022-10-23 stsp 			err = send_ref(outfd, iref.id, refname,
 348 13b2bc37 2022-10-23 stsp 			    !sent_capabilities, client_is_reading,
 349 13b2bc37 2022-10-23 stsp 			    NULL, chattygot);
 350 13b2bc37 2022-10-23 stsp 			free(refname);
 351 13b2bc37 2022-10-23 stsp 			refname = NULL;
 352 13b2bc37 2022-10-23 stsp 			if (err)
 353 13b2bc37 2022-10-23 stsp 				goto done;
 354 13b2bc37 2022-10-23 stsp 			sent_capabilities = 1;
 355 13b2bc37 2022-10-23 stsp 			if (nrefs > 0)
 356 13b2bc37 2022-10-23 stsp 				nrefs--;
 357 13b2bc37 2022-10-23 stsp 			break;
 358 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_SYMREF:
 359 13b2bc37 2022-10-23 stsp 			if (!have_nrefs || nrefs == 0) {
 360 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_MSG);
 361 13b2bc37 2022-10-23 stsp 				goto done;
 362 13b2bc37 2022-10-23 stsp 			}
 363 13b2bc37 2022-10-23 stsp 			if (datalen < sizeof(isymref)) {
 364 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_LEN);
 365 13b2bc37 2022-10-23 stsp 				goto done;
 366 13b2bc37 2022-10-23 stsp 			}
 367 13b2bc37 2022-10-23 stsp 			memcpy(&isymref, imsg.data, sizeof(isymref));
 368 13b2bc37 2022-10-23 stsp 			if (datalen != sizeof(isymref) + isymref.name_len +
 369 13b2bc37 2022-10-23 stsp 			    isymref.target_len) {
 370 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_LEN);
 371 13b2bc37 2022-10-23 stsp 				goto done;
 372 13b2bc37 2022-10-23 stsp 			}
 373 13b2bc37 2022-10-23 stsp 
 374 13b2bc37 2022-10-23 stsp 			/*
 375 13b2bc37 2022-10-23 stsp 			 * For now, we only announce one symbolic ref,
 376 13b2bc37 2022-10-23 stsp 			 * as part of our capability advertisement.
 377 13b2bc37 2022-10-23 stsp 			 */
 378 13b2bc37 2022-10-23 stsp 			if (sent_capabilities || symrefstr != NULL ||
 379 13b2bc37 2022-10-23 stsp 			    symrefname != NULL || symreftarget != NULL)
 380 13b2bc37 2022-10-23 stsp 				break;
 381 13b2bc37 2022-10-23 stsp 
 382 00b3e9ae 2023-01-11 op 			symrefname = strndup(imsg.data + sizeof(isymref),
 383 00b3e9ae 2023-01-11 op 			    isymref.name_len);
 384 13b2bc37 2022-10-23 stsp 			if (symrefname == NULL) {
 385 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("malloc");
 386 13b2bc37 2022-10-23 stsp 				goto done;
 387 13b2bc37 2022-10-23 stsp 			}
 388 13b2bc37 2022-10-23 stsp 
 389 00b3e9ae 2023-01-11 op 			symreftarget = strndup(
 390 00b3e9ae 2023-01-11 op 			    imsg.data + sizeof(isymref) + isymref.name_len,
 391 00b3e9ae 2023-01-11 op 			    isymref.target_len);
 392 13b2bc37 2022-10-23 stsp 			if (symreftarget == NULL) {
 393 00b3e9ae 2023-01-11 op 				err = got_error_from_errno("strndup");
 394 13b2bc37 2022-10-23 stsp 				goto done;
 395 13b2bc37 2022-10-23 stsp 			}
 396 13b2bc37 2022-10-23 stsp 
 397 13b2bc37 2022-10-23 stsp 			if (asprintf(&symrefstr, "%s:%s", symrefname,
 398 13b2bc37 2022-10-23 stsp 			    symreftarget) == -1) {
 399 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("asprintf");
 400 13b2bc37 2022-10-23 stsp 				goto done;
 401 13b2bc37 2022-10-23 stsp 			}
 402 13b2bc37 2022-10-23 stsp 			err = send_ref(outfd, isymref.target_id, symrefname,
 403 13b2bc37 2022-10-23 stsp 			    !sent_capabilities, client_is_reading, symrefstr,
 404 13b2bc37 2022-10-23 stsp 			    chattygot);
 405 13b2bc37 2022-10-23 stsp 			free(refname);
 406 13b2bc37 2022-10-23 stsp 			refname = NULL;
 407 13b2bc37 2022-10-23 stsp 			if (err)
 408 13b2bc37 2022-10-23 stsp 				goto done;
 409 13b2bc37 2022-10-23 stsp 			sent_capabilities = 1;
 410 13b2bc37 2022-10-23 stsp 			if (nrefs > 0)
 411 13b2bc37 2022-10-23 stsp 				nrefs--;
 412 13b2bc37 2022-10-23 stsp 			break;
 413 13b2bc37 2022-10-23 stsp 		default:
 414 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 415 13b2bc37 2022-10-23 stsp 			break;
 416 13b2bc37 2022-10-23 stsp 		}
 417 13b2bc37 2022-10-23 stsp 
 418 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
 419 13b2bc37 2022-10-23 stsp 	}
 420 13b2bc37 2022-10-23 stsp 
 421 13b2bc37 2022-10-23 stsp 	err = got_pkt_flushpkt(outfd, chattygot);
 422 13b2bc37 2022-10-23 stsp 	if (err)
 423 13b2bc37 2022-10-23 stsp 		goto done;
 424 13b2bc37 2022-10-23 stsp done:
 425 13b2bc37 2022-10-23 stsp 	free(symrefstr);
 426 13b2bc37 2022-10-23 stsp 	free(symrefname);
 427 13b2bc37 2022-10-23 stsp 	free(symreftarget);
 428 13b2bc37 2022-10-23 stsp 	return err;
 429 13b2bc37 2022-10-23 stsp }
 430 13b2bc37 2022-10-23 stsp 
 431 13b2bc37 2022-10-23 stsp static const struct got_error *
 432 13b2bc37 2022-10-23 stsp parse_want_line(char **common_capabilities, uint8_t *id, char *buf, size_t len)
 433 13b2bc37 2022-10-23 stsp {
 434 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 435 13b2bc37 2022-10-23 stsp 	char *id_str = NULL, *client_capabilities = NULL;
 436 13b2bc37 2022-10-23 stsp 
 437 13b2bc37 2022-10-23 stsp 	err = got_gitproto_parse_want_line(&id_str,
 438 13b2bc37 2022-10-23 stsp 	    &client_capabilities, buf, len);
 439 13b2bc37 2022-10-23 stsp 	if (err)
 440 13b2bc37 2022-10-23 stsp 		return err;
 441 13b2bc37 2022-10-23 stsp 
 442 13b2bc37 2022-10-23 stsp 	if (!got_parse_sha1_digest(id, id_str)) {
 443 13b2bc37 2022-10-23 stsp 		err = got_error_msg(GOT_ERR_BAD_PACKET,
 444 13b2bc37 2022-10-23 stsp 		    "want-line with bad object ID");
 445 13b2bc37 2022-10-23 stsp 		goto done;
 446 13b2bc37 2022-10-23 stsp 	}
 447 13b2bc37 2022-10-23 stsp 
 448 13b2bc37 2022-10-23 stsp 	if (client_capabilities) {
 449 13b2bc37 2022-10-23 stsp 		err = got_gitproto_match_capabilities(common_capabilities,
 450 13b2bc37 2022-10-23 stsp 		    NULL, client_capabilities, read_capabilities,
 451 13b2bc37 2022-10-23 stsp 		    nitems(read_capabilities));
 452 13b2bc37 2022-10-23 stsp 		if (err)
 453 13b2bc37 2022-10-23 stsp 			goto done;
 454 13b2bc37 2022-10-23 stsp 	}
 455 13b2bc37 2022-10-23 stsp done:
 456 13b2bc37 2022-10-23 stsp 	free(id_str);
 457 13b2bc37 2022-10-23 stsp 	free(client_capabilities);
 458 13b2bc37 2022-10-23 stsp 	return err;
 459 13b2bc37 2022-10-23 stsp }
 460 13b2bc37 2022-10-23 stsp 
 461 13b2bc37 2022-10-23 stsp static const struct got_error *
 462 13b2bc37 2022-10-23 stsp parse_have_line(uint8_t *id, char *buf, size_t len)
 463 13b2bc37 2022-10-23 stsp {
 464 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 465 13b2bc37 2022-10-23 stsp 	char *id_str = NULL;
 466 13b2bc37 2022-10-23 stsp 
 467 13b2bc37 2022-10-23 stsp 	err = got_gitproto_parse_have_line(&id_str, buf, len);
 468 13b2bc37 2022-10-23 stsp 	if (err)
 469 13b2bc37 2022-10-23 stsp 		return err;
 470 13b2bc37 2022-10-23 stsp 
 471 13b2bc37 2022-10-23 stsp 	if (!got_parse_sha1_digest(id, id_str)) {
 472 13b2bc37 2022-10-23 stsp 		err = got_error_msg(GOT_ERR_BAD_PACKET,
 473 13b2bc37 2022-10-23 stsp 		    "have-line with bad object ID");
 474 13b2bc37 2022-10-23 stsp 		goto done;
 475 13b2bc37 2022-10-23 stsp 	}
 476 13b2bc37 2022-10-23 stsp done:
 477 13b2bc37 2022-10-23 stsp 	free(id_str);
 478 13b2bc37 2022-10-23 stsp 	return err;
 479 13b2bc37 2022-10-23 stsp }
 480 13b2bc37 2022-10-23 stsp 
 481 13b2bc37 2022-10-23 stsp static const struct got_error *
 482 13b2bc37 2022-10-23 stsp send_capability(struct got_capability *capa, struct imsgbuf *ibuf)
 483 13b2bc37 2022-10-23 stsp {
 484 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 485 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_capability icapa;
 486 13b2bc37 2022-10-23 stsp 	size_t len;
 487 13b2bc37 2022-10-23 stsp 	struct ibuf *wbuf;
 488 13b2bc37 2022-10-23 stsp 
 489 13b2bc37 2022-10-23 stsp 	memset(&icapa, 0, sizeof(icapa));
 490 13b2bc37 2022-10-23 stsp 
 491 13b2bc37 2022-10-23 stsp 	icapa.key_len = strlen(capa->key);
 492 13b2bc37 2022-10-23 stsp 	len = sizeof(icapa) + icapa.key_len;
 493 13b2bc37 2022-10-23 stsp 	if (capa->value) {
 494 13b2bc37 2022-10-23 stsp 		icapa.value_len = strlen(capa->value);
 495 13b2bc37 2022-10-23 stsp 		len += icapa.value_len;
 496 13b2bc37 2022-10-23 stsp 	}
 497 13b2bc37 2022-10-23 stsp 
 498 13b2bc37 2022-10-23 stsp 	wbuf = imsg_create(ibuf, GOTD_IMSG_CAPABILITY, 0, 0, len);
 499 13b2bc37 2022-10-23 stsp 	if (wbuf == NULL) {
 500 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("imsg_create CAPABILITY");
 501 13b2bc37 2022-10-23 stsp 		return err;
 502 13b2bc37 2022-10-23 stsp 	}
 503 13b2bc37 2022-10-23 stsp 
 504 13b2bc37 2022-10-23 stsp 	if (imsg_add(wbuf, &icapa, sizeof(icapa)) == -1)
 505 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_add CAPABILITY");
 506 13b2bc37 2022-10-23 stsp 	if (imsg_add(wbuf, capa->key, icapa.key_len) == -1)
 507 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_add CAPABILITY");
 508 13b2bc37 2022-10-23 stsp 	if (capa->value) {
 509 13b2bc37 2022-10-23 stsp 		if (imsg_add(wbuf, capa->value, icapa.value_len) == -1)
 510 13b2bc37 2022-10-23 stsp 			return got_error_from_errno("imsg_add CAPABILITY");
 511 13b2bc37 2022-10-23 stsp 	}
 512 13b2bc37 2022-10-23 stsp 
 513 13b2bc37 2022-10-23 stsp 	wbuf->fd = -1;
 514 13b2bc37 2022-10-23 stsp 	imsg_close(ibuf, wbuf);
 515 13b2bc37 2022-10-23 stsp 
 516 13b2bc37 2022-10-23 stsp 	return NULL;
 517 13b2bc37 2022-10-23 stsp }
 518 13b2bc37 2022-10-23 stsp 
 519 13b2bc37 2022-10-23 stsp static const struct got_error *
 520 13b2bc37 2022-10-23 stsp send_capabilities(int *use_sidebands, int *report_status,
 521 13b2bc37 2022-10-23 stsp     char *capabilities_str, struct imsgbuf *ibuf)
 522 13b2bc37 2022-10-23 stsp {
 523 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 524 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_capabilities icapas;
 525 13b2bc37 2022-10-23 stsp 	struct got_capability *capa = NULL;
 526 13b2bc37 2022-10-23 stsp 	size_t ncapa, i;
 527 13b2bc37 2022-10-23 stsp 
 528 13b2bc37 2022-10-23 stsp 	err = got_gitproto_split_capabilities_str(&capa, &ncapa,
 529 13b2bc37 2022-10-23 stsp 	    capabilities_str);
 530 13b2bc37 2022-10-23 stsp 	if (err)
 531 13b2bc37 2022-10-23 stsp 		return err;
 532 13b2bc37 2022-10-23 stsp 
 533 13b2bc37 2022-10-23 stsp 	icapas.ncapabilities = ncapa;
 534 13b2bc37 2022-10-23 stsp 	if (imsg_compose(ibuf, GOTD_IMSG_CAPABILITIES, 0, 0, -1,
 535 13b2bc37 2022-10-23 stsp 	    &icapas, sizeof(icapas)) == -1) {
 536 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("imsg_compose IMSG_CAPABILITIES");
 537 13b2bc37 2022-10-23 stsp 		goto done;
 538 13b2bc37 2022-10-23 stsp 	}
 539 13b2bc37 2022-10-23 stsp 
 540 13b2bc37 2022-10-23 stsp 	for (i = 0; i < ncapa; i++) {
 541 13b2bc37 2022-10-23 stsp 		err = send_capability(&capa[i], ibuf);
 542 13b2bc37 2022-10-23 stsp 		if (err)
 543 13b2bc37 2022-10-23 stsp 			goto done;
 544 13b2bc37 2022-10-23 stsp 		if (use_sidebands &&
 545 13b2bc37 2022-10-23 stsp 		    strcmp(capa[i].key, GOT_CAPA_SIDE_BAND_64K) == 0)
 546 13b2bc37 2022-10-23 stsp 			*use_sidebands = 1;
 547 13b2bc37 2022-10-23 stsp 		if (report_status &&
 548 13b2bc37 2022-10-23 stsp 		    strcmp(capa[i].key, GOT_CAPA_REPORT_STATUS) == 0)
 549 13b2bc37 2022-10-23 stsp 			*report_status = 1;
 550 13b2bc37 2022-10-23 stsp 	}
 551 13b2bc37 2022-10-23 stsp done:
 552 13b2bc37 2022-10-23 stsp 	free(capa);
 553 13b2bc37 2022-10-23 stsp 	return err;
 554 13b2bc37 2022-10-23 stsp }
 555 13b2bc37 2022-10-23 stsp 
 556 13b2bc37 2022-10-23 stsp static const struct got_error *
 557 13b2bc37 2022-10-23 stsp forward_flushpkt(struct imsgbuf *ibuf)
 558 13b2bc37 2022-10-23 stsp {
 559 13b2bc37 2022-10-23 stsp 	if (imsg_compose(ibuf, GOTD_IMSG_FLUSH, 0, 0, -1, NULL, 0) == -1)
 560 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_compose FLUSH");
 561 13b2bc37 2022-10-23 stsp 
 562 13b2bc37 2022-10-23 stsp 	return gotd_imsg_flush(ibuf);
 563 13b2bc37 2022-10-23 stsp }
 564 13b2bc37 2022-10-23 stsp 
 565 13b2bc37 2022-10-23 stsp static const struct got_error *
 566 13b2bc37 2022-10-23 stsp recv_ack(struct imsg *imsg, uint8_t *expected_id)
 567 13b2bc37 2022-10-23 stsp {
 568 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_ack iack;
 569 13b2bc37 2022-10-23 stsp 	size_t datalen;
 570 13b2bc37 2022-10-23 stsp 
 571 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 572 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(iack))
 573 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
 574 13b2bc37 2022-10-23 stsp 
 575 13b2bc37 2022-10-23 stsp 	memcpy(&iack, imsg->data, sizeof(iack));
 576 13b2bc37 2022-10-23 stsp 	if (memcmp(iack.object_id, expected_id, SHA1_DIGEST_LENGTH) != 0)
 577 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_OBJ_ID);
 578 13b2bc37 2022-10-23 stsp 
 579 13b2bc37 2022-10-23 stsp 	return NULL;
 580 13b2bc37 2022-10-23 stsp }
 581 13b2bc37 2022-10-23 stsp 
 582 13b2bc37 2022-10-23 stsp static const struct got_error *
 583 13b2bc37 2022-10-23 stsp recv_nak(struct imsg *imsg, uint8_t *expected_id)
 584 13b2bc37 2022-10-23 stsp {
 585 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_ack inak;
 586 13b2bc37 2022-10-23 stsp 	size_t datalen;
 587 13b2bc37 2022-10-23 stsp 
 588 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 589 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(inak))
 590 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
 591 13b2bc37 2022-10-23 stsp 
 592 13b2bc37 2022-10-23 stsp 	memcpy(&inak, imsg->data, sizeof(inak));
 593 13b2bc37 2022-10-23 stsp 	if (memcmp(inak.object_id, expected_id, SHA1_DIGEST_LENGTH) != 0)
 594 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_OBJ_ID);
 595 13b2bc37 2022-10-23 stsp 
 596 13b2bc37 2022-10-23 stsp 	return NULL;
 597 13b2bc37 2022-10-23 stsp }
 598 13b2bc37 2022-10-23 stsp 
 599 13b2bc37 2022-10-23 stsp 
 600 13b2bc37 2022-10-23 stsp static const struct got_error *
 601 13b2bc37 2022-10-23 stsp recv_want(int *use_sidebands, int outfd, struct imsgbuf *ibuf,
 602 13b2bc37 2022-10-23 stsp     char *buf, size_t len, int expect_capabilities, int chattygot)
 603 13b2bc37 2022-10-23 stsp {
 604 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 605 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_want iwant;
 606 13b2bc37 2022-10-23 stsp 	char *capabilities_str;
 607 13b2bc37 2022-10-23 stsp 	int done = 0;
 608 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 609 13b2bc37 2022-10-23 stsp 
 610 13b2bc37 2022-10-23 stsp 	memset(&iwant, 0, sizeof(iwant));
 611 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
 612 13b2bc37 2022-10-23 stsp 
 613 13b2bc37 2022-10-23 stsp 	err = parse_want_line(&capabilities_str, iwant.object_id, buf, len);
 614 13b2bc37 2022-10-23 stsp 	if (err)
 615 13b2bc37 2022-10-23 stsp 		return err;
 616 13b2bc37 2022-10-23 stsp 
 617 13b2bc37 2022-10-23 stsp 	if (capabilities_str) {
 618 13b2bc37 2022-10-23 stsp 		if (!expect_capabilities) {
 619 13b2bc37 2022-10-23 stsp 			err = got_error_msg(GOT_ERR_BAD_PACKET,
 620 13b2bc37 2022-10-23 stsp 			    "unexpected capability announcement received");
 621 13b2bc37 2022-10-23 stsp 			goto done;
 622 13b2bc37 2022-10-23 stsp 		}
 623 13b2bc37 2022-10-23 stsp 		err = send_capabilities(use_sidebands, NULL, capabilities_str,
 624 13b2bc37 2022-10-23 stsp 		    ibuf);
 625 13b2bc37 2022-10-23 stsp 		if (err)
 626 13b2bc37 2022-10-23 stsp 			goto done;
 627 13b2bc37 2022-10-23 stsp 
 628 13b2bc37 2022-10-23 stsp 	}
 629 13b2bc37 2022-10-23 stsp 
 630 13b2bc37 2022-10-23 stsp 	if (imsg_compose(ibuf, GOTD_IMSG_WANT, 0, 0, -1,
 631 13b2bc37 2022-10-23 stsp 	    &iwant, sizeof(iwant)) == -1) {
 632 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("imsg_compose WANT");
 633 13b2bc37 2022-10-23 stsp 		goto done;
 634 13b2bc37 2022-10-23 stsp 	}
 635 13b2bc37 2022-10-23 stsp 
 636 13b2bc37 2022-10-23 stsp 	err = gotd_imsg_flush(ibuf);
 637 13b2bc37 2022-10-23 stsp 	if (err)
 638 13b2bc37 2022-10-23 stsp 		goto done;
 639 13b2bc37 2022-10-23 stsp 
 640 13b2bc37 2022-10-23 stsp 	/*
 641 13b2bc37 2022-10-23 stsp 	 * Wait for an ACK, or an error in case the desired object
 642 13b2bc37 2022-10-23 stsp 	 * does not exist.
 643 13b2bc37 2022-10-23 stsp 	 */
 644 13b2bc37 2022-10-23 stsp 	while (!done && err == NULL) {
 645 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
 646 13b2bc37 2022-10-23 stsp 		if (err)
 647 13b2bc37 2022-10-23 stsp 			break;
 648 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
 649 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
 650 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
 651 13b2bc37 2022-10-23 stsp 			break;
 652 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ACK:
 653 13b2bc37 2022-10-23 stsp 			err = recv_ack(&imsg, iwant.object_id);
 654 13b2bc37 2022-10-23 stsp 			if (err)
 655 13b2bc37 2022-10-23 stsp 				break;
 656 13b2bc37 2022-10-23 stsp 			done = 1;
 657 13b2bc37 2022-10-23 stsp 			break;
 658 13b2bc37 2022-10-23 stsp 		default:
 659 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 660 13b2bc37 2022-10-23 stsp 			break;
 661 13b2bc37 2022-10-23 stsp 		}
 662 13b2bc37 2022-10-23 stsp 
 663 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
 664 13b2bc37 2022-10-23 stsp 	}
 665 13b2bc37 2022-10-23 stsp done:
 666 13b2bc37 2022-10-23 stsp 	free(capabilities_str);
 667 13b2bc37 2022-10-23 stsp 	return err;
 668 13b2bc37 2022-10-23 stsp }
 669 13b2bc37 2022-10-23 stsp 
 670 13b2bc37 2022-10-23 stsp static const struct got_error *
 671 13b2bc37 2022-10-23 stsp send_ack(int outfd, uint8_t *id, int chattygot)
 672 13b2bc37 2022-10-23 stsp {
 673 13b2bc37 2022-10-23 stsp 	char hex[SHA1_DIGEST_STRING_LENGTH];
 674 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
 675 13b2bc37 2022-10-23 stsp 	int len;
 676 13b2bc37 2022-10-23 stsp 
 677 758dc042 2022-11-06 stsp 	if (got_sha1_digest_to_str(id, hex, sizeof(hex)) == NULL)
 678 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_BAD_OBJ_ID);
 679 13b2bc37 2022-10-23 stsp 
 680 13b2bc37 2022-10-23 stsp 	len = snprintf(buf, sizeof(buf), "ACK %s\n", hex);
 681 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf))
 682 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_NO_SPACE);
 683 13b2bc37 2022-10-23 stsp 
 684 13b2bc37 2022-10-23 stsp 	return got_pkt_writepkt(outfd, buf, len, chattygot);
 685 13b2bc37 2022-10-23 stsp }
 686 13b2bc37 2022-10-23 stsp 
 687 13b2bc37 2022-10-23 stsp static const struct got_error *
 688 13b2bc37 2022-10-23 stsp send_nak(int outfd, int chattygot)
 689 13b2bc37 2022-10-23 stsp {
 690 13b2bc37 2022-10-23 stsp 	char buf[5];
 691 13b2bc37 2022-10-23 stsp 	int len;
 692 13b2bc37 2022-10-23 stsp 
 693 13b2bc37 2022-10-23 stsp 	len = snprintf(buf, sizeof(buf), "NAK\n");
 694 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf))
 695 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_NO_SPACE);
 696 13b2bc37 2022-10-23 stsp 
 697 13b2bc37 2022-10-23 stsp 	return got_pkt_writepkt(outfd, buf, len, chattygot);
 698 13b2bc37 2022-10-23 stsp }
 699 13b2bc37 2022-10-23 stsp 
 700 13b2bc37 2022-10-23 stsp static const struct got_error *
 701 13b2bc37 2022-10-23 stsp recv_have(int *have_ack, int outfd, struct imsgbuf *ibuf, char *buf,
 702 13b2bc37 2022-10-23 stsp     size_t len, int chattygot)
 703 13b2bc37 2022-10-23 stsp {
 704 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 705 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_have ihave;
 706 13b2bc37 2022-10-23 stsp 	int done = 0;
 707 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 708 13b2bc37 2022-10-23 stsp 
 709 13b2bc37 2022-10-23 stsp 	memset(&ihave, 0, sizeof(ihave));
 710 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
 711 13b2bc37 2022-10-23 stsp 
 712 13b2bc37 2022-10-23 stsp 	err = parse_have_line(ihave.object_id, buf, len);
 713 13b2bc37 2022-10-23 stsp 	if (err)
 714 13b2bc37 2022-10-23 stsp 		return err;
 715 13b2bc37 2022-10-23 stsp 
 716 13b2bc37 2022-10-23 stsp 	if (imsg_compose(ibuf, GOTD_IMSG_HAVE, 0, 0, -1,
 717 13b2bc37 2022-10-23 stsp 	    &ihave, sizeof(ihave)) == -1)
 718 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_compose HAVE");
 719 13b2bc37 2022-10-23 stsp 
 720 13b2bc37 2022-10-23 stsp 	err = gotd_imsg_flush(ibuf);
 721 13b2bc37 2022-10-23 stsp 	if (err)
 722 13b2bc37 2022-10-23 stsp 		return err;
 723 13b2bc37 2022-10-23 stsp 
 724 13b2bc37 2022-10-23 stsp 	/*
 725 13b2bc37 2022-10-23 stsp 	 * Wait for an ACK or a NAK, indicating whether a common
 726 13b2bc37 2022-10-23 stsp 	 * commit object has been found.
 727 13b2bc37 2022-10-23 stsp 	 */
 728 13b2bc37 2022-10-23 stsp 	while (!done && err == NULL) {
 729 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
 730 13b2bc37 2022-10-23 stsp 		if (err)
 731 13b2bc37 2022-10-23 stsp 			return err;
 732 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
 733 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
 734 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
 735 13b2bc37 2022-10-23 stsp 			break;
 736 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ACK:
 737 13b2bc37 2022-10-23 stsp 			err = recv_ack(&imsg, ihave.object_id);
 738 13b2bc37 2022-10-23 stsp 			if (err)
 739 13b2bc37 2022-10-23 stsp 				break;
 740 13b2bc37 2022-10-23 stsp 			if (!*have_ack) {
 741 13b2bc37 2022-10-23 stsp 				err = send_ack(outfd, ihave.object_id,
 742 13b2bc37 2022-10-23 stsp 				    chattygot);
 743 13b2bc37 2022-10-23 stsp 				if (err)
 744 13b2bc37 2022-10-23 stsp 					return err;
 745 13b2bc37 2022-10-23 stsp 				*have_ack = 1;
 746 13b2bc37 2022-10-23 stsp 			}
 747 13b2bc37 2022-10-23 stsp 			done = 1;
 748 13b2bc37 2022-10-23 stsp 			break;
 749 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_NAK:
 750 13b2bc37 2022-10-23 stsp 			err = recv_nak(&imsg, ihave.object_id);
 751 13b2bc37 2022-10-23 stsp 			if (err)
 752 13b2bc37 2022-10-23 stsp 				break;
 753 13b2bc37 2022-10-23 stsp 			done = 1;
 754 13b2bc37 2022-10-23 stsp 			break;
 755 13b2bc37 2022-10-23 stsp 		default:
 756 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 757 13b2bc37 2022-10-23 stsp 			break;
 758 13b2bc37 2022-10-23 stsp 		}
 759 13b2bc37 2022-10-23 stsp 
 760 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
 761 13b2bc37 2022-10-23 stsp 	}
 762 13b2bc37 2022-10-23 stsp 
 763 13b2bc37 2022-10-23 stsp 	return err;
 764 13b2bc37 2022-10-23 stsp }
 765 13b2bc37 2022-10-23 stsp 
 766 13b2bc37 2022-10-23 stsp static const struct got_error *
 767 13b2bc37 2022-10-23 stsp recv_done(int *packfd, int outfd, struct imsgbuf *ibuf, int chattygot)
 768 13b2bc37 2022-10-23 stsp {
 769 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
 770 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 771 13b2bc37 2022-10-23 stsp 
 772 13b2bc37 2022-10-23 stsp 	*packfd = -1;
 773 13b2bc37 2022-10-23 stsp 
 774 13b2bc37 2022-10-23 stsp 	if (imsg_compose(ibuf, GOTD_IMSG_DONE, 0, 0, -1, NULL, 0) == -1)
 775 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_compose DONE");
 776 13b2bc37 2022-10-23 stsp 
 777 13b2bc37 2022-10-23 stsp 	err = gotd_imsg_flush(ibuf);
 778 13b2bc37 2022-10-23 stsp 	if (err)
 779 13b2bc37 2022-10-23 stsp 		return err;
 780 13b2bc37 2022-10-23 stsp 
 781 86769de8 2022-10-28 stsp 	while (*packfd == -1 && err == NULL) {
 782 86769de8 2022-10-28 stsp 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
 783 86769de8 2022-10-28 stsp 		if (err)
 784 86769de8 2022-10-28 stsp 			break;
 785 13b2bc37 2022-10-23 stsp 
 786 86769de8 2022-10-28 stsp 		switch (imsg.hdr.type) {
 787 86769de8 2022-10-28 stsp 		case GOTD_IMSG_ERROR:
 788 86769de8 2022-10-28 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
 789 86769de8 2022-10-28 stsp 			break;
 790 86769de8 2022-10-28 stsp 		case GOTD_IMSG_PACKFILE_PIPE:
 791 86769de8 2022-10-28 stsp 			if (imsg.fd != -1)
 792 86769de8 2022-10-28 stsp 				*packfd = imsg.fd;
 793 86769de8 2022-10-28 stsp 			else
 794 86769de8 2022-10-28 stsp 				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
 795 86769de8 2022-10-28 stsp 			break;
 796 86769de8 2022-10-28 stsp 		default:
 797 86769de8 2022-10-28 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 798 86769de8 2022-10-28 stsp 			break;
 799 86769de8 2022-10-28 stsp 		}
 800 13b2bc37 2022-10-23 stsp 
 801 86769de8 2022-10-28 stsp 		imsg_free(&imsg);
 802 86769de8 2022-10-28 stsp 	}
 803 86769de8 2022-10-28 stsp 
 804 13b2bc37 2022-10-23 stsp 	return err;
 805 13b2bc37 2022-10-23 stsp }
 806 13b2bc37 2022-10-23 stsp 
 807 13b2bc37 2022-10-23 stsp static const struct got_error *
 808 13b2bc37 2022-10-23 stsp relay_progress_reports(struct imsgbuf *ibuf, int outfd, int chattygot)
 809 13b2bc37 2022-10-23 stsp {
 810 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 811 13b2bc37 2022-10-23 stsp 	int pack_starting = 0;
 812 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_packfile_progress iprog;
 813 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
 814 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
 815 13b2bc37 2022-10-23 stsp 	size_t datalen;
 816 13b2bc37 2022-10-23 stsp 	int p_deltify = 0, n;
 817 13b2bc37 2022-10-23 stsp 	const char *eol = "\r";
 818 13b2bc37 2022-10-23 stsp 
 819 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
 820 13b2bc37 2022-10-23 stsp 
 821 13b2bc37 2022-10-23 stsp 	while (!pack_starting && err == NULL) {
 822 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
 823 13b2bc37 2022-10-23 stsp 		if (err)
 824 13b2bc37 2022-10-23 stsp 			break;
 825 13b2bc37 2022-10-23 stsp 
 826 13b2bc37 2022-10-23 stsp 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
 827 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
 828 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
 829 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
 830 13b2bc37 2022-10-23 stsp 			break;
 831 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_PACKFILE_READY:
 832 13b2bc37 2022-10-23 stsp 			eol = "\n";
 833 13b2bc37 2022-10-23 stsp 			pack_starting = 1;
 834 13b2bc37 2022-10-23 stsp 			/* fallthrough */
 835 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_PACKFILE_PROGRESS:
 836 13b2bc37 2022-10-23 stsp 			if (datalen != sizeof(iprog)) {
 837 13b2bc37 2022-10-23 stsp 				err = got_error(GOT_ERR_PRIVSEP_LEN);
 838 13b2bc37 2022-10-23 stsp 				break;
 839 13b2bc37 2022-10-23 stsp 			}
 840 13b2bc37 2022-10-23 stsp 			memcpy(&iprog, imsg.data, sizeof(iprog));
 841 13b2bc37 2022-10-23 stsp 			if (iprog.nobj_total > 0) {
 842 13b2bc37 2022-10-23 stsp 				p_deltify = (iprog.nobj_deltify * 100) /
 843 13b2bc37 2022-10-23 stsp 				    iprog.nobj_total;
 844 13b2bc37 2022-10-23 stsp 			}
 845 13b2bc37 2022-10-23 stsp 			buf[0] = GOT_SIDEBAND_PROGRESS_INFO;
 846 13b2bc37 2022-10-23 stsp 			n = snprintf(&buf[1], sizeof(buf) - 1,
 847 13b2bc37 2022-10-23 stsp 			    "%d commits colored, "
 848 13b2bc37 2022-10-23 stsp 			    "%d objects found, "
 849 13b2bc37 2022-10-23 stsp 			    "deltify %d%%%s",
 850 758dc042 2022-11-06 stsp 			    iprog.ncolored,
 851 758dc042 2022-11-06 stsp 			    iprog.nfound,
 852 13b2bc37 2022-10-23 stsp 			    p_deltify, eol);
 853 13b2bc37 2022-10-23 stsp 			if (n >= sizeof(buf) - 1)
 854 13b2bc37 2022-10-23 stsp 				break;
 855 13b2bc37 2022-10-23 stsp 			err = got_pkt_writepkt(outfd, buf, 1 + n, chattygot);
 856 13b2bc37 2022-10-23 stsp 			break;
 857 13b2bc37 2022-10-23 stsp 		default:
 858 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
 859 13b2bc37 2022-10-23 stsp 			break;
 860 13b2bc37 2022-10-23 stsp 		}
 861 13b2bc37 2022-10-23 stsp 
 862 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
 863 13b2bc37 2022-10-23 stsp 	}
 864 13b2bc37 2022-10-23 stsp 
 865 13b2bc37 2022-10-23 stsp 	return err;
 866 13b2bc37 2022-10-23 stsp }
 867 13b2bc37 2022-10-23 stsp 
 868 13b2bc37 2022-10-23 stsp static const struct got_error *
 869 13b2bc37 2022-10-23 stsp serve_read(int infd, int outfd, int gotd_sock, const char *repo_path,
 870 13b2bc37 2022-10-23 stsp     int chattygot)
 871 13b2bc37 2022-10-23 stsp {
 872 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
 873 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
 874 13b2bc37 2022-10-23 stsp 	struct imsgbuf ibuf;
 875 13b2bc37 2022-10-23 stsp 	enum protostate {
 876 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_WANT,
 877 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_MORE_WANT,
 878 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_HAVE,
 879 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_DONE,
 880 13b2bc37 2022-10-23 stsp 		STATE_DONE,
 881 13b2bc37 2022-10-23 stsp 	};
 882 13b2bc37 2022-10-23 stsp 	enum protostate curstate = STATE_EXPECT_WANT;
 883 13b2bc37 2022-10-23 stsp 	int have_ack = 0, use_sidebands = 0, seen_have = 0;
 884 13b2bc37 2022-10-23 stsp 	int packfd = -1;
 885 13b2bc37 2022-10-23 stsp 	size_t pack_chunksize;
 886 13b2bc37 2022-10-23 stsp 
 887 13b2bc37 2022-10-23 stsp 	imsg_init(&ibuf, gotd_sock);
 888 13b2bc37 2022-10-23 stsp 
 889 13b2bc37 2022-10-23 stsp 	err = announce_refs(outfd, &ibuf, 1, repo_path, chattygot);
 890 13b2bc37 2022-10-23 stsp 	if (err)
 891 13b2bc37 2022-10-23 stsp 		goto done;
 892 13b2bc37 2022-10-23 stsp 
 893 13b2bc37 2022-10-23 stsp 	while (curstate != STATE_DONE) {
 894 13b2bc37 2022-10-23 stsp 		int n;
 895 13b2bc37 2022-10-23 stsp 		buf[0] = '\0';
 896 13b2bc37 2022-10-23 stsp 		err = got_pkt_readpkt(&n, infd, buf, sizeof(buf), chattygot);
 897 13b2bc37 2022-10-23 stsp 		if (err)
 898 96afb0d6 2023-01-21 stsp 			goto done;
 899 13b2bc37 2022-10-23 stsp 		if (n == 0) {
 900 fecfd5bc 2023-01-18 stsp 			if (curstate != STATE_EXPECT_WANT &&
 901 fecfd5bc 2023-01-18 stsp 			    curstate != STATE_EXPECT_MORE_WANT &&
 902 f9550d47 2023-01-18 stsp 			    curstate != STATE_EXPECT_HAVE &&
 903 f9550d47 2023-01-18 stsp 			    curstate != STATE_EXPECT_DONE) {
 904 13b2bc37 2022-10-23 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
 905 13b2bc37 2022-10-23 stsp 				    "unexpected flush packet received");
 906 13b2bc37 2022-10-23 stsp 				goto done;
 907 13b2bc37 2022-10-23 stsp 			}
 908 fecfd5bc 2023-01-18 stsp 
 909 fecfd5bc 2023-01-18 stsp 			if (curstate == STATE_EXPECT_WANT) {
 910 fecfd5bc 2023-01-18 stsp 				ssize_t r;
 911 fecfd5bc 2023-01-18 stsp 				/*
 912 fecfd5bc 2023-01-18 stsp 				 * If the client does not want to fetch
 913 fecfd5bc 2023-01-18 stsp 				 * anything we should receive a flush
 914 fecfd5bc 2023-01-18 stsp 				 * packet followed by EOF.
 915 fecfd5bc 2023-01-18 stsp 				 */
 916 fecfd5bc 2023-01-18 stsp 				r = read(infd, buf, sizeof(buf));
 917 fecfd5bc 2023-01-18 stsp 				if (r == -1) {
 918 fecfd5bc 2023-01-18 stsp 					err = got_error_from_errno("read");
 919 fecfd5bc 2023-01-18 stsp 					goto done;
 920 fecfd5bc 2023-01-18 stsp 				}
 921 fecfd5bc 2023-01-18 stsp 				if (r == 0) /* EOF */
 922 fecfd5bc 2023-01-18 stsp 					goto done;
 923 fecfd5bc 2023-01-18 stsp 
 924 fecfd5bc 2023-01-18 stsp 				/* Zero-length field followed by payload. */
 925 fecfd5bc 2023-01-18 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
 926 fecfd5bc 2023-01-18 stsp 				    "unexpected flush packet received");
 927 fecfd5bc 2023-01-18 stsp 				goto done;
 928 fecfd5bc 2023-01-18 stsp 			}
 929 fecfd5bc 2023-01-18 stsp 
 930 f91b5c43 2023-01-21 stsp 			if (curstate == STATE_EXPECT_WANT ||
 931 f91b5c43 2023-01-21 stsp 			    curstate == STATE_EXPECT_MORE_WANT ||
 932 f91b5c43 2023-01-21 stsp 			    curstate == STATE_EXPECT_HAVE) {
 933 f91b5c43 2023-01-21 stsp 				err = forward_flushpkt(&ibuf);
 934 f91b5c43 2023-01-21 stsp 				if (err)
 935 f91b5c43 2023-01-21 stsp 					goto done;
 936 f91b5c43 2023-01-21 stsp 			}
 937 13b2bc37 2022-10-23 stsp 			if (curstate == STATE_EXPECT_HAVE && !have_ack) {
 938 13b2bc37 2022-10-23 stsp 				err = send_nak(outfd, chattygot);
 939 13b2bc37 2022-10-23 stsp 				if (err)
 940 13b2bc37 2022-10-23 stsp 					goto done;
 941 13b2bc37 2022-10-23 stsp 			}
 942 13b2bc37 2022-10-23 stsp 			if (curstate == STATE_EXPECT_MORE_WANT)
 943 13b2bc37 2022-10-23 stsp 				curstate = STATE_EXPECT_HAVE;
 944 13b2bc37 2022-10-23 stsp 			else
 945 13b2bc37 2022-10-23 stsp 				curstate = STATE_EXPECT_DONE;
 946 13b2bc37 2022-10-23 stsp 		} else if (n >= 5 && strncmp(buf, "want ", 5) == 0) {
 947 13b2bc37 2022-10-23 stsp 			if (curstate != STATE_EXPECT_WANT &&
 948 13b2bc37 2022-10-23 stsp 			    curstate != STATE_EXPECT_MORE_WANT) {
 949 13b2bc37 2022-10-23 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
 950 13b2bc37 2022-10-23 stsp 				    "unexpected 'want' packet");
 951 13b2bc37 2022-10-23 stsp 				goto done;
 952 13b2bc37 2022-10-23 stsp 			}
 953 13b2bc37 2022-10-23 stsp 			err = recv_want(&use_sidebands, outfd, &ibuf, buf, n,
 954 13b2bc37 2022-10-23 stsp 			    curstate == STATE_EXPECT_WANT ? 1 : 0, chattygot);
 955 13b2bc37 2022-10-23 stsp 			if (err)
 956 13b2bc37 2022-10-23 stsp 				goto done;
 957 13b2bc37 2022-10-23 stsp 			if (curstate == STATE_EXPECT_WANT)
 958 13b2bc37 2022-10-23 stsp 				curstate = STATE_EXPECT_MORE_WANT;
 959 13b2bc37 2022-10-23 stsp 		} else if (n >= 5 && strncmp(buf, "have ", 5) == 0) {
 960 f9550d47 2023-01-18 stsp 			if (curstate != STATE_EXPECT_HAVE &&
 961 f9550d47 2023-01-18 stsp 			    curstate != STATE_EXPECT_DONE) {
 962 13b2bc37 2022-10-23 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
 963 13b2bc37 2022-10-23 stsp 				    "unexpected 'have' packet");
 964 13b2bc37 2022-10-23 stsp 				goto done;
 965 13b2bc37 2022-10-23 stsp 			}
 966 f9550d47 2023-01-18 stsp 			if (curstate == STATE_EXPECT_HAVE) {
 967 f9550d47 2023-01-18 stsp 				err = recv_have(&have_ack, outfd, &ibuf,
 968 f9550d47 2023-01-18 stsp 				    buf, n, chattygot);
 969 f9550d47 2023-01-18 stsp 				if (err)
 970 f9550d47 2023-01-18 stsp 					goto done;
 971 f9550d47 2023-01-18 stsp 				seen_have = 1;
 972 f9550d47 2023-01-18 stsp 				if (have_ack)
 973 f9550d47 2023-01-18 stsp 					curstate = STATE_EXPECT_DONE;
 974 f9550d47 2023-01-18 stsp 			}
 975 13b2bc37 2022-10-23 stsp 		} else if (n == 5 && strncmp(buf, "done\n", 5) == 0) {
 976 13b2bc37 2022-10-23 stsp 			if (curstate != STATE_EXPECT_HAVE &&
 977 13b2bc37 2022-10-23 stsp 			    curstate != STATE_EXPECT_DONE) {
 978 13b2bc37 2022-10-23 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
 979 13b2bc37 2022-10-23 stsp 				    "unexpected 'done' packet");
 980 13b2bc37 2022-10-23 stsp 				goto done;
 981 13b2bc37 2022-10-23 stsp 			}
 982 13b2bc37 2022-10-23 stsp 			err = recv_done(&packfd, outfd, &ibuf, chattygot);
 983 13b2bc37 2022-10-23 stsp 			if (err)
 984 13b2bc37 2022-10-23 stsp 				goto done;
 985 13b2bc37 2022-10-23 stsp 			curstate = STATE_DONE;
 986 13b2bc37 2022-10-23 stsp 			break;
 987 13b2bc37 2022-10-23 stsp 		} else {
 988 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_BAD_PACKET);
 989 13b2bc37 2022-10-23 stsp 			goto done;
 990 13b2bc37 2022-10-23 stsp 		}
 991 13b2bc37 2022-10-23 stsp 	}
 992 13b2bc37 2022-10-23 stsp 
 993 13b2bc37 2022-10-23 stsp 	if (!seen_have) {
 994 13b2bc37 2022-10-23 stsp 		err = send_nak(outfd, chattygot);
 995 13b2bc37 2022-10-23 stsp 		if (err)
 996 13b2bc37 2022-10-23 stsp 			goto done;
 997 13b2bc37 2022-10-23 stsp 	}
 998 13b2bc37 2022-10-23 stsp 
 999 13b2bc37 2022-10-23 stsp 	if (use_sidebands) {
1000 13b2bc37 2022-10-23 stsp 		err = relay_progress_reports(&ibuf, outfd, chattygot);
1001 13b2bc37 2022-10-23 stsp 		if (err)
1002 13b2bc37 2022-10-23 stsp 			goto done;
1003 13b2bc37 2022-10-23 stsp 		pack_chunksize = GOT_SIDEBAND_64K_PACKFILE_DATA_MAX;
1004 13b2bc37 2022-10-23 stsp 	} else
1005 13b2bc37 2022-10-23 stsp 		pack_chunksize = sizeof(buf);
1006 13b2bc37 2022-10-23 stsp 
1007 13b2bc37 2022-10-23 stsp 	for (;;) {
1008 1c9d898d 2022-10-31 stsp 		ssize_t r;
1009 13b2bc37 2022-10-23 stsp 
1010 13b2bc37 2022-10-23 stsp 		r = read(packfd, use_sidebands ? &buf[1] : buf,
1011 13b2bc37 2022-10-23 stsp 		    pack_chunksize);
1012 13b2bc37 2022-10-23 stsp 		if (r == -1) {
1013 13b2bc37 2022-10-23 stsp 			err = got_error_from_errno("read");
1014 13b2bc37 2022-10-23 stsp 			break;
1015 13b2bc37 2022-10-23 stsp 		} else if (r == 0) {
1016 13b2bc37 2022-10-23 stsp 			err = got_pkt_flushpkt(outfd, chattygot);
1017 13b2bc37 2022-10-23 stsp 			break;
1018 13b2bc37 2022-10-23 stsp 		}
1019 13b2bc37 2022-10-23 stsp 
1020 13b2bc37 2022-10-23 stsp 		if (use_sidebands) {
1021 13b2bc37 2022-10-23 stsp 			buf[0] = GOT_SIDEBAND_PACKFILE_DATA;
1022 13b2bc37 2022-10-23 stsp 			err = got_pkt_writepkt(outfd, buf, 1 + r, chattygot);
1023 13b2bc37 2022-10-23 stsp 			if (err)
1024 13b2bc37 2022-10-23 stsp 				break;
1025 13b2bc37 2022-10-23 stsp 		} else {
1026 1c9d898d 2022-10-31 stsp 			err = got_poll_write_full(outfd, buf, r);
1027 1c9d898d 2022-10-31 stsp 			if (err) {
1028 1c9d898d 2022-10-31 stsp 				if (err->code == GOT_ERR_EOF)
1029 1c9d898d 2022-10-31 stsp 					err = NULL;
1030 13b2bc37 2022-10-23 stsp 				break;
1031 13b2bc37 2022-10-23 stsp 			}
1032 13b2bc37 2022-10-23 stsp 		}
1033 13b2bc37 2022-10-23 stsp 	}
1034 13b2bc37 2022-10-23 stsp done:
1035 13b2bc37 2022-10-23 stsp 	imsg_clear(&ibuf);
1036 13b2bc37 2022-10-23 stsp 	if (packfd != -1 && close(packfd) == -1 && err == NULL)
1037 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("close");
1038 13b2bc37 2022-10-23 stsp 	if (err)
1039 13b2bc37 2022-10-23 stsp 		echo_error(err, outfd, chattygot);
1040 13b2bc37 2022-10-23 stsp 	return err;
1041 13b2bc37 2022-10-23 stsp }
1042 13b2bc37 2022-10-23 stsp 
1043 13b2bc37 2022-10-23 stsp static const struct got_error *
1044 13b2bc37 2022-10-23 stsp parse_ref_update_line(char **common_capabilities, char **refname,
1045 13b2bc37 2022-10-23 stsp     uint8_t *old_id, uint8_t *new_id, char *buf, size_t len)
1046 13b2bc37 2022-10-23 stsp {
1047 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
1048 13b2bc37 2022-10-23 stsp 	char *old_id_str = NULL, *new_id_str = NULL;
1049 13b2bc37 2022-10-23 stsp 	char *client_capabilities = NULL;
1050 13b2bc37 2022-10-23 stsp 
1051 13b2bc37 2022-10-23 stsp 	*refname = NULL;
1052 13b2bc37 2022-10-23 stsp 
1053 13b2bc37 2022-10-23 stsp 	err = got_gitproto_parse_ref_update_line(&old_id_str, &new_id_str,
1054 13b2bc37 2022-10-23 stsp 	    refname, &client_capabilities, buf, len);
1055 13b2bc37 2022-10-23 stsp 	if (err)
1056 13b2bc37 2022-10-23 stsp 		return err;
1057 13b2bc37 2022-10-23 stsp 
1058 13b2bc37 2022-10-23 stsp 	if (!got_parse_sha1_digest(old_id, old_id_str) ||
1059 13b2bc37 2022-10-23 stsp 	    !got_parse_sha1_digest(new_id, new_id_str)) {
1060 13b2bc37 2022-10-23 stsp 		err = got_error_msg(GOT_ERR_BAD_PACKET,
1061 13b2bc37 2022-10-23 stsp 		    "ref-update with bad object ID");
1062 13b2bc37 2022-10-23 stsp 		goto done;
1063 13b2bc37 2022-10-23 stsp 	}
1064 13b2bc37 2022-10-23 stsp 	if (!got_ref_name_is_valid(*refname)) {
1065 13b2bc37 2022-10-23 stsp 		err = got_error_msg(GOT_ERR_BAD_PACKET,
1066 13b2bc37 2022-10-23 stsp 		    "ref-update with bad reference name");
1067 13b2bc37 2022-10-23 stsp 		goto done;
1068 13b2bc37 2022-10-23 stsp 	}
1069 13b2bc37 2022-10-23 stsp 
1070 13b2bc37 2022-10-23 stsp 	if (client_capabilities) {
1071 13b2bc37 2022-10-23 stsp 		err = got_gitproto_match_capabilities(common_capabilities,
1072 13b2bc37 2022-10-23 stsp 		    NULL, client_capabilities, write_capabilities,
1073 13b2bc37 2022-10-23 stsp 		    nitems(write_capabilities));
1074 13b2bc37 2022-10-23 stsp 		if (err)
1075 13b2bc37 2022-10-23 stsp 			goto done;
1076 13b2bc37 2022-10-23 stsp 	}
1077 13b2bc37 2022-10-23 stsp done:
1078 13b2bc37 2022-10-23 stsp 	free(old_id_str);
1079 13b2bc37 2022-10-23 stsp 	free(new_id_str);
1080 13b2bc37 2022-10-23 stsp 	free(client_capabilities);
1081 13b2bc37 2022-10-23 stsp 	if (err) {
1082 13b2bc37 2022-10-23 stsp 		free(*refname);
1083 13b2bc37 2022-10-23 stsp 		*refname = NULL;
1084 13b2bc37 2022-10-23 stsp 	}
1085 13b2bc37 2022-10-23 stsp 	return err;
1086 13b2bc37 2022-10-23 stsp }
1087 13b2bc37 2022-10-23 stsp 
1088 13b2bc37 2022-10-23 stsp static const struct got_error *
1089 13b2bc37 2022-10-23 stsp recv_ref_update(int *report_status, int outfd, struct imsgbuf *ibuf,
1090 13b2bc37 2022-10-23 stsp     char *buf, size_t len, int expect_capabilities, int chattygot)
1091 13b2bc37 2022-10-23 stsp {
1092 13b2bc37 2022-10-23 stsp 	const struct got_error *err;
1093 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_ref_update iref;
1094 13b2bc37 2022-10-23 stsp 	struct ibuf *wbuf;
1095 13b2bc37 2022-10-23 stsp 	char *capabilities_str = NULL, *refname = NULL;
1096 13b2bc37 2022-10-23 stsp 	int done = 0;
1097 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
1098 13b2bc37 2022-10-23 stsp 
1099 13b2bc37 2022-10-23 stsp 	memset(&iref, 0, sizeof(iref));
1100 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
1101 13b2bc37 2022-10-23 stsp 
1102 13b2bc37 2022-10-23 stsp 	err = parse_ref_update_line(&capabilities_str, &refname,
1103 13b2bc37 2022-10-23 stsp 	    iref.old_id, iref.new_id, buf, len);
1104 13b2bc37 2022-10-23 stsp 	if (err)
1105 13b2bc37 2022-10-23 stsp 		return err;
1106 13b2bc37 2022-10-23 stsp 
1107 13b2bc37 2022-10-23 stsp 	if (capabilities_str) {
1108 13b2bc37 2022-10-23 stsp 		if (!expect_capabilities) {
1109 13b2bc37 2022-10-23 stsp 			err = got_error_msg(GOT_ERR_BAD_PACKET,
1110 13b2bc37 2022-10-23 stsp 			    "unexpected capability announcement received");
1111 13b2bc37 2022-10-23 stsp 			goto done;
1112 13b2bc37 2022-10-23 stsp 		}
1113 13b2bc37 2022-10-23 stsp 		err = send_capabilities(NULL, report_status, capabilities_str,
1114 13b2bc37 2022-10-23 stsp 		    ibuf);
1115 13b2bc37 2022-10-23 stsp 		if (err)
1116 13b2bc37 2022-10-23 stsp 			goto done;
1117 13b2bc37 2022-10-23 stsp 	}
1118 13b2bc37 2022-10-23 stsp 
1119 13b2bc37 2022-10-23 stsp 	iref.name_len = strlen(refname);
1120 13b2bc37 2022-10-23 stsp 	len = sizeof(iref) + iref.name_len;
1121 13b2bc37 2022-10-23 stsp 	wbuf = imsg_create(ibuf, GOTD_IMSG_REF_UPDATE, 0, 0, len);
1122 13b2bc37 2022-10-23 stsp 	if (wbuf == NULL) {
1123 13b2bc37 2022-10-23 stsp 		err = got_error_from_errno("imsg_create REF_UPDATE");
1124 13b2bc37 2022-10-23 stsp 		goto done;
1125 13b2bc37 2022-10-23 stsp 	}
1126 13b2bc37 2022-10-23 stsp 
1127 13b2bc37 2022-10-23 stsp 	if (imsg_add(wbuf, &iref, sizeof(iref)) == -1)
1128 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_add REF_UPDATE");
1129 13b2bc37 2022-10-23 stsp 	if (imsg_add(wbuf, refname, iref.name_len) == -1)
1130 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_add REF_UPDATE");
1131 13b2bc37 2022-10-23 stsp 	wbuf->fd = -1;
1132 13b2bc37 2022-10-23 stsp 	imsg_close(ibuf, wbuf);
1133 13b2bc37 2022-10-23 stsp 
1134 13b2bc37 2022-10-23 stsp 	err = gotd_imsg_flush(ibuf);
1135 13b2bc37 2022-10-23 stsp 	if (err)
1136 13b2bc37 2022-10-23 stsp 		goto done;
1137 13b2bc37 2022-10-23 stsp 
1138 13b2bc37 2022-10-23 stsp 	/* Wait for ACK or an error. */
1139 13b2bc37 2022-10-23 stsp 	while (!done && err == NULL) {
1140 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
1141 13b2bc37 2022-10-23 stsp 		if (err)
1142 13b2bc37 2022-10-23 stsp 			break;
1143 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
1144 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
1145 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
1146 13b2bc37 2022-10-23 stsp 			break;
1147 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ACK:
1148 13b2bc37 2022-10-23 stsp 			err = recv_ack(&imsg, iref.new_id);
1149 13b2bc37 2022-10-23 stsp 			if (err)
1150 13b2bc37 2022-10-23 stsp 				break;
1151 13b2bc37 2022-10-23 stsp 			done = 1;
1152 13b2bc37 2022-10-23 stsp 			break;
1153 13b2bc37 2022-10-23 stsp 		default:
1154 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1155 13b2bc37 2022-10-23 stsp 			break;
1156 13b2bc37 2022-10-23 stsp 		}
1157 13b2bc37 2022-10-23 stsp 
1158 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
1159 13b2bc37 2022-10-23 stsp 	}
1160 13b2bc37 2022-10-23 stsp done:
1161 13b2bc37 2022-10-23 stsp 	free(capabilities_str);
1162 13b2bc37 2022-10-23 stsp 	free(refname);
1163 13b2bc37 2022-10-23 stsp 	return err;
1164 13b2bc37 2022-10-23 stsp }
1165 13b2bc37 2022-10-23 stsp 
1166 13b2bc37 2022-10-23 stsp static const struct got_error *
1167 13b2bc37 2022-10-23 stsp recv_packfile(struct imsg *imsg, int infd)
1168 13b2bc37 2022-10-23 stsp {
1169 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
1170 13b2bc37 2022-10-23 stsp 	size_t datalen;
1171 13b2bc37 2022-10-23 stsp 	int packfd;
1172 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
1173 13b2bc37 2022-10-23 stsp 	int pack_done = 0;
1174 13b2bc37 2022-10-23 stsp 
1175 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1176 13b2bc37 2022-10-23 stsp 	if (datalen != 0)
1177 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_MSG);
1178 13b2bc37 2022-10-23 stsp 
1179 13b2bc37 2022-10-23 stsp 	if (imsg->fd == -1)
1180 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
1181 a2c12f7b 2023-01-27 op 
1182 13b2bc37 2022-10-23 stsp 	packfd = imsg->fd;
1183 13b2bc37 2022-10-23 stsp 	while (!pack_done) {
1184 13b2bc37 2022-10-23 stsp 		ssize_t r = 0;
1185 13b2bc37 2022-10-23 stsp 
1186 13b2bc37 2022-10-23 stsp 		err = got_poll_fd(infd, POLLIN, 1);
1187 13b2bc37 2022-10-23 stsp 		if (err) {
1188 13b2bc37 2022-10-23 stsp 			if (err->code != GOT_ERR_TIMEOUT)
1189 13b2bc37 2022-10-23 stsp 				break;
1190 13b2bc37 2022-10-23 stsp 			err = NULL;
1191 13b2bc37 2022-10-23 stsp 		} else {
1192 13b2bc37 2022-10-23 stsp 			r = read(infd, buf, sizeof(buf));
1193 13b2bc37 2022-10-23 stsp 			if (r == -1) {
1194 13b2bc37 2022-10-23 stsp 				err = got_error_from_errno("read");
1195 13b2bc37 2022-10-23 stsp 				break;
1196 13b2bc37 2022-10-23 stsp 			}
1197 13b2bc37 2022-10-23 stsp 			if (r == 0) {
1198 13b2bc37 2022-10-23 stsp 				/*
1199 13b2bc37 2022-10-23 stsp 				 * Git clients hang up their side of the
1200 13b2bc37 2022-10-23 stsp 				 * connection after sending the pack file.
1201 13b2bc37 2022-10-23 stsp 				 */
1202 13b2bc37 2022-10-23 stsp 				err = NULL;
1203 13b2bc37 2022-10-23 stsp 				pack_done = 1;
1204 13b2bc37 2022-10-23 stsp 				break;
1205 13b2bc37 2022-10-23 stsp 			}
1206 13b2bc37 2022-10-23 stsp 		}
1207 13b2bc37 2022-10-23 stsp 
1208 13b2bc37 2022-10-23 stsp 		if (r == 0) {
1209 13b2bc37 2022-10-23 stsp 			/* Detect gotd(8) closing the pack pipe when done. */
1210 13b2bc37 2022-10-23 stsp 			err = got_poll_fd(packfd, POLLOUT, 1);
1211 13b2bc37 2022-10-23 stsp 			if (err) {
1212 13b2bc37 2022-10-23 stsp 				if (err->code != GOT_ERR_EOF)
1213 13b2bc37 2022-10-23 stsp 					break;
1214 13b2bc37 2022-10-23 stsp 				err = NULL;
1215 13b2bc37 2022-10-23 stsp 				pack_done = 1;
1216 13b2bc37 2022-10-23 stsp 			}
1217 13b2bc37 2022-10-23 stsp 		} else {
1218 13b2bc37 2022-10-23 stsp 			/* Write pack data and/or detect pipe being closed. */
1219 13b2bc37 2022-10-23 stsp 			err = got_poll_write_full(packfd, buf, r);
1220 13b2bc37 2022-10-23 stsp 			if (err) {
1221 13b2bc37 2022-10-23 stsp 				if (err->code == GOT_ERR_EOF)
1222 13b2bc37 2022-10-23 stsp 					err = NULL;
1223 13b2bc37 2022-10-23 stsp 				break;
1224 13b2bc37 2022-10-23 stsp 			}
1225 13b2bc37 2022-10-23 stsp 		}
1226 13b2bc37 2022-10-23 stsp 	}
1227 13b2bc37 2022-10-23 stsp 
1228 13b2bc37 2022-10-23 stsp 	close(packfd);
1229 13b2bc37 2022-10-23 stsp 	return err;
1230 13b2bc37 2022-10-23 stsp }
1231 13b2bc37 2022-10-23 stsp 
1232 13b2bc37 2022-10-23 stsp static const struct got_error *
1233 13b2bc37 2022-10-23 stsp report_unpack_status(struct imsg *imsg, int outfd, int chattygot)
1234 13b2bc37 2022-10-23 stsp {
1235 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
1236 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_packfile_status istatus;
1237 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
1238 13b2bc37 2022-10-23 stsp 	size_t datalen, len;
1239 13b2bc37 2022-10-23 stsp 	char *reason = NULL;
1240 13b2bc37 2022-10-23 stsp 
1241 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1242 13b2bc37 2022-10-23 stsp 	if (datalen < sizeof(istatus))
1243 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
1244 13b2bc37 2022-10-23 stsp 	memcpy(&istatus, imsg->data, sizeof(istatus));
1245 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(istatus) + istatus.reason_len)
1246 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
1247 13b2bc37 2022-10-23 stsp 
1248 00b3e9ae 2023-01-11 op 	reason = strndup(imsg->data + sizeof(istatus), istatus.reason_len);
1249 13b2bc37 2022-10-23 stsp 	if (reason == NULL) {
1250 00b3e9ae 2023-01-11 op 		err = got_error_from_errno("strndup");
1251 13b2bc37 2022-10-23 stsp 		goto done;
1252 13b2bc37 2022-10-23 stsp 	}
1253 13b2bc37 2022-10-23 stsp 
1254 13b2bc37 2022-10-23 stsp 	if (err == NULL)
1255 13b2bc37 2022-10-23 stsp 		len = snprintf(buf, sizeof(buf), "unpack ok\n");
1256 13b2bc37 2022-10-23 stsp 	else
1257 13b2bc37 2022-10-23 stsp 		len = snprintf(buf, sizeof(buf), "unpack %s\n", reason);
1258 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf)) {
1259 13b2bc37 2022-10-23 stsp 		err = got_error(GOT_ERR_NO_SPACE);
1260 13b2bc37 2022-10-23 stsp 		goto done;
1261 13b2bc37 2022-10-23 stsp 	}
1262 13b2bc37 2022-10-23 stsp 
1263 13b2bc37 2022-10-23 stsp 	err = got_pkt_writepkt(outfd, buf, len, chattygot);
1264 13b2bc37 2022-10-23 stsp done:
1265 13b2bc37 2022-10-23 stsp 	free(reason);
1266 13b2bc37 2022-10-23 stsp 	return err;
1267 13b2bc37 2022-10-23 stsp }
1268 13b2bc37 2022-10-23 stsp 
1269 13b2bc37 2022-10-23 stsp static const struct got_error *
1270 13b2bc37 2022-10-23 stsp recv_ref_update_ok(struct imsg *imsg, int outfd, int chattygot)
1271 13b2bc37 2022-10-23 stsp {
1272 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
1273 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_ref_update_ok iok;
1274 13b2bc37 2022-10-23 stsp 	size_t datalen, len;
1275 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
1276 13b2bc37 2022-10-23 stsp 	char *refname = NULL;
1277 13b2bc37 2022-10-23 stsp 
1278 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1279 13b2bc37 2022-10-23 stsp 	if (datalen < sizeof(iok))
1280 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
1281 13b2bc37 2022-10-23 stsp 	memcpy(&iok, imsg->data, sizeof(iok));
1282 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(iok) + iok.name_len)
1283 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
1284 13b2bc37 2022-10-23 stsp 
1285 13b2bc37 2022-10-23 stsp 	memcpy(&iok, imsg->data, sizeof(iok));
1286 13b2bc37 2022-10-23 stsp 
1287 00b3e9ae 2023-01-11 op 	refname = strndup(imsg->data + sizeof(iok), iok.name_len);
1288 13b2bc37 2022-10-23 stsp 	if (refname == NULL)
1289 00b3e9ae 2023-01-11 op 		return got_error_from_errno("strndup");
1290 13b2bc37 2022-10-23 stsp 
1291 13b2bc37 2022-10-23 stsp 	len = snprintf(buf, sizeof(buf), "ok %s\n", refname);
1292 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf)) {
1293 13b2bc37 2022-10-23 stsp 		err = got_error(GOT_ERR_NO_SPACE);
1294 13b2bc37 2022-10-23 stsp 		goto done;
1295 13b2bc37 2022-10-23 stsp 	}
1296 13b2bc37 2022-10-23 stsp 
1297 13b2bc37 2022-10-23 stsp 	err = got_pkt_writepkt(outfd, buf, len, chattygot);
1298 13b2bc37 2022-10-23 stsp done:
1299 13b2bc37 2022-10-23 stsp 	free(refname);
1300 13b2bc37 2022-10-23 stsp 	return err;
1301 13b2bc37 2022-10-23 stsp }
1302 13b2bc37 2022-10-23 stsp 
1303 13b2bc37 2022-10-23 stsp static const struct got_error *
1304 13b2bc37 2022-10-23 stsp recv_ref_update_ng(struct imsg *imsg, int outfd, int chattygot)
1305 13b2bc37 2022-10-23 stsp {
1306 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
1307 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_ref_update_ng ing;
1308 13b2bc37 2022-10-23 stsp 	size_t datalen, len;
1309 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
1310 13b2bc37 2022-10-23 stsp 	char *refname = NULL, *reason = NULL;
1311 13b2bc37 2022-10-23 stsp 
1312 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1313 13b2bc37 2022-10-23 stsp 	if (datalen < sizeof(ing))
1314 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
1315 13b2bc37 2022-10-23 stsp 	memcpy(&ing, imsg->data, sizeof(ing));
1316 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(ing) + ing.name_len + ing.reason_len)
1317 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
1318 13b2bc37 2022-10-23 stsp 
1319 13b2bc37 2022-10-23 stsp 	memcpy(&ing, imsg->data, sizeof(ing));
1320 13b2bc37 2022-10-23 stsp 
1321 00b3e9ae 2023-01-11 op 	refname = strndup(imsg->data + sizeof(ing), ing.name_len);
1322 13b2bc37 2022-10-23 stsp 	if (refname == NULL)
1323 00b3e9ae 2023-01-11 op 		return got_error_from_errno("strndup");
1324 13b2bc37 2022-10-23 stsp 
1325 00b3e9ae 2023-01-11 op 	reason = strndup(imsg->data + sizeof(ing) + ing.name_len,
1326 00b3e9ae 2023-01-11 op 	    ing.reason_len);
1327 13b2bc37 2022-10-23 stsp 	if (reason == NULL) {
1328 00b3e9ae 2023-01-11 op 		err = got_error_from_errno("strndup");
1329 13b2bc37 2022-10-23 stsp 		goto done;
1330 13b2bc37 2022-10-23 stsp 	}
1331 13b2bc37 2022-10-23 stsp 
1332 13b2bc37 2022-10-23 stsp 	len = snprintf(buf, sizeof(buf), "ng %s %s\n", refname, reason);
1333 13b2bc37 2022-10-23 stsp 	if (len >= sizeof(buf)) {
1334 13b2bc37 2022-10-23 stsp 		err = got_error(GOT_ERR_NO_SPACE);
1335 13b2bc37 2022-10-23 stsp 		goto done;
1336 13b2bc37 2022-10-23 stsp 	}
1337 13b2bc37 2022-10-23 stsp 
1338 13b2bc37 2022-10-23 stsp 	err = got_pkt_writepkt(outfd, buf, len, chattygot);
1339 13b2bc37 2022-10-23 stsp done:
1340 13b2bc37 2022-10-23 stsp 	free(refname);
1341 13b2bc37 2022-10-23 stsp 	free(reason);
1342 13b2bc37 2022-10-23 stsp 	return err;
1343 13b2bc37 2022-10-23 stsp }
1344 13b2bc37 2022-10-23 stsp 
1345 13b2bc37 2022-10-23 stsp static const struct got_error *
1346 13b2bc37 2022-10-23 stsp serve_write(int infd, int outfd, int gotd_sock, const char *repo_path,
1347 13b2bc37 2022-10-23 stsp     int chattygot)
1348 13b2bc37 2022-10-23 stsp {
1349 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
1350 13b2bc37 2022-10-23 stsp 	char buf[GOT_PKT_MAX];
1351 13b2bc37 2022-10-23 stsp 	struct imsgbuf ibuf;
1352 13b2bc37 2022-10-23 stsp 	enum protostate {
1353 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_REF_UPDATE,
1354 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_MORE_REF_UPDATES,
1355 13b2bc37 2022-10-23 stsp 		STATE_EXPECT_PACKFILE,
1356 13b2bc37 2022-10-23 stsp 		STATE_PACKFILE_RECEIVED,
1357 13b2bc37 2022-10-23 stsp 		STATE_REFS_UPDATED,
1358 13b2bc37 2022-10-23 stsp 	};
1359 13b2bc37 2022-10-23 stsp 	enum protostate curstate = STATE_EXPECT_REF_UPDATE;
1360 13b2bc37 2022-10-23 stsp 	struct imsg imsg;
1361 13b2bc37 2022-10-23 stsp 	int report_status = 0;
1362 13b2bc37 2022-10-23 stsp 
1363 13b2bc37 2022-10-23 stsp 	imsg_init(&ibuf, gotd_sock);
1364 13b2bc37 2022-10-23 stsp 	memset(&imsg, 0, sizeof(imsg));
1365 13b2bc37 2022-10-23 stsp 
1366 13b2bc37 2022-10-23 stsp 	err = announce_refs(outfd, &ibuf, 0, repo_path, chattygot);
1367 13b2bc37 2022-10-23 stsp 	if (err)
1368 13b2bc37 2022-10-23 stsp 		goto done;
1369 13b2bc37 2022-10-23 stsp 
1370 13b2bc37 2022-10-23 stsp 	while (curstate != STATE_EXPECT_PACKFILE) {
1371 13b2bc37 2022-10-23 stsp 		int n;
1372 13b2bc37 2022-10-23 stsp 		buf[0] = '\0';
1373 13b2bc37 2022-10-23 stsp 		err = got_pkt_readpkt(&n, infd, buf, sizeof(buf), chattygot);
1374 13b2bc37 2022-10-23 stsp 		if (err)
1375 f3dfebfc 2023-01-23 stsp 			goto done;
1376 13b2bc37 2022-10-23 stsp 		if (n == 0) {
1377 13b2bc37 2022-10-23 stsp 			if (curstate != STATE_EXPECT_MORE_REF_UPDATES) {
1378 13b2bc37 2022-10-23 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
1379 13b2bc37 2022-10-23 stsp 				    "unexpected flush packet received");
1380 13b2bc37 2022-10-23 stsp 				goto done;
1381 13b2bc37 2022-10-23 stsp 			}
1382 13b2bc37 2022-10-23 stsp 			err = forward_flushpkt(&ibuf);
1383 13b2bc37 2022-10-23 stsp 			if (err)
1384 13b2bc37 2022-10-23 stsp 				goto done;
1385 13b2bc37 2022-10-23 stsp 			curstate = STATE_EXPECT_PACKFILE;
1386 13b2bc37 2022-10-23 stsp 		} else if (n >= (SHA1_DIGEST_STRING_LENGTH * 2) + 2) {
1387 13b2bc37 2022-10-23 stsp 			if (curstate != STATE_EXPECT_REF_UPDATE &&
1388 13b2bc37 2022-10-23 stsp 			    curstate != STATE_EXPECT_MORE_REF_UPDATES) {
1389 13b2bc37 2022-10-23 stsp 				err = got_error_msg(GOT_ERR_BAD_PACKET,
1390 13b2bc37 2022-10-23 stsp 				    "unexpected ref-update packet");
1391 13b2bc37 2022-10-23 stsp 				goto done;
1392 13b2bc37 2022-10-23 stsp 			}
1393 13b2bc37 2022-10-23 stsp 			if (curstate == STATE_EXPECT_REF_UPDATE) {
1394 13b2bc37 2022-10-23 stsp 				err = recv_ref_update(&report_status,
1395 13b2bc37 2022-10-23 stsp 				    outfd, &ibuf, buf, n, 1, chattygot);
1396 13b2bc37 2022-10-23 stsp 			} else {
1397 13b2bc37 2022-10-23 stsp 				err = recv_ref_update(NULL, outfd, &ibuf,
1398 13b2bc37 2022-10-23 stsp 				    buf, n, 0, chattygot);
1399 13b2bc37 2022-10-23 stsp 			}
1400 13b2bc37 2022-10-23 stsp 			if (err)
1401 13b2bc37 2022-10-23 stsp 				goto done;
1402 13b2bc37 2022-10-23 stsp 			curstate = STATE_EXPECT_MORE_REF_UPDATES;
1403 13b2bc37 2022-10-23 stsp 		} else {
1404 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_BAD_PACKET);
1405 13b2bc37 2022-10-23 stsp 			goto done;
1406 13b2bc37 2022-10-23 stsp 		}
1407 13b2bc37 2022-10-23 stsp 	}
1408 13b2bc37 2022-10-23 stsp 
1409 13b2bc37 2022-10-23 stsp 	while (curstate != STATE_PACKFILE_RECEIVED) {
1410 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, &ibuf, 0);
1411 13b2bc37 2022-10-23 stsp 		if (err)
1412 13b2bc37 2022-10-23 stsp 			goto done;
1413 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
1414 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
1415 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
1416 13b2bc37 2022-10-23 stsp 			goto done;
1417 7fec5f4a 2022-10-28 stsp 		case GOTD_IMSG_PACKFILE_PIPE:
1418 13b2bc37 2022-10-23 stsp 			err = recv_packfile(&imsg, infd);
1419 13b2bc37 2022-10-23 stsp 			if (err) {
1420 13b2bc37 2022-10-23 stsp 				if (err->code != GOT_ERR_EOF)
1421 13b2bc37 2022-10-23 stsp 					goto done;
1422 13b2bc37 2022-10-23 stsp 				/*
1423 13b2bc37 2022-10-23 stsp 				 * EOF is reported when the client hangs up,
1424 13b2bc37 2022-10-23 stsp 				 * which can happen with Git clients.
1425 13b2bc37 2022-10-23 stsp 				 * The socket should stay half-open so we
1426 13b2bc37 2022-10-23 stsp 				 * can still send our reports if requested.
1427 13b2bc37 2022-10-23 stsp 				 */
1428 13b2bc37 2022-10-23 stsp 				err = NULL;
1429 13b2bc37 2022-10-23 stsp 			}
1430 13b2bc37 2022-10-23 stsp 			curstate = STATE_PACKFILE_RECEIVED;
1431 13b2bc37 2022-10-23 stsp 			break;
1432 13b2bc37 2022-10-23 stsp 		default:
1433 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1434 13b2bc37 2022-10-23 stsp 			break;
1435 13b2bc37 2022-10-23 stsp 		}
1436 13b2bc37 2022-10-23 stsp 
1437 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
1438 13b2bc37 2022-10-23 stsp 		if (err)
1439 13b2bc37 2022-10-23 stsp 			goto done;
1440 13b2bc37 2022-10-23 stsp 	}
1441 13b2bc37 2022-10-23 stsp 
1442 13b2bc37 2022-10-23 stsp 	while (curstate != STATE_REFS_UPDATED && err == NULL) {
1443 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_poll_recv(&imsg, &ibuf, 0);
1444 13b2bc37 2022-10-23 stsp 		if (err)
1445 13b2bc37 2022-10-23 stsp 			break;
1446 13b2bc37 2022-10-23 stsp 		switch (imsg.hdr.type) {
1447 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_ERROR:
1448 13b2bc37 2022-10-23 stsp 			err = gotd_imsg_recv_error(NULL, &imsg);
1449 13b2bc37 2022-10-23 stsp 			break;
1450 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_PACKFILE_STATUS:
1451 13b2bc37 2022-10-23 stsp 			if (!report_status)
1452 13b2bc37 2022-10-23 stsp 				break;
1453 13b2bc37 2022-10-23 stsp 			err = report_unpack_status(&imsg, outfd, chattygot);
1454 13b2bc37 2022-10-23 stsp 			break;
1455 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_REF_UPDATE_OK:
1456 13b2bc37 2022-10-23 stsp 			if (!report_status)
1457 13b2bc37 2022-10-23 stsp 				break;
1458 13b2bc37 2022-10-23 stsp 			err = recv_ref_update_ok(&imsg, outfd, chattygot);
1459 13b2bc37 2022-10-23 stsp 			break;
1460 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_REF_UPDATE_NG:
1461 13b2bc37 2022-10-23 stsp 			if (!report_status)
1462 13b2bc37 2022-10-23 stsp 				break;
1463 13b2bc37 2022-10-23 stsp 			err = recv_ref_update_ng(&imsg, outfd, chattygot);
1464 13b2bc37 2022-10-23 stsp 			break;
1465 13b2bc37 2022-10-23 stsp 		case GOTD_IMSG_REFS_UPDATED:
1466 13b2bc37 2022-10-23 stsp 			curstate = STATE_REFS_UPDATED;
1467 13b2bc37 2022-10-23 stsp 			err = got_pkt_flushpkt(outfd, chattygot);
1468 13b2bc37 2022-10-23 stsp 			break;
1469 13b2bc37 2022-10-23 stsp 		default:
1470 13b2bc37 2022-10-23 stsp 			err = got_error(GOT_ERR_PRIVSEP_MSG);
1471 13b2bc37 2022-10-23 stsp 			break;
1472 13b2bc37 2022-10-23 stsp 		}
1473 13b2bc37 2022-10-23 stsp 
1474 13b2bc37 2022-10-23 stsp 		imsg_free(&imsg);
1475 13b2bc37 2022-10-23 stsp 	}
1476 13b2bc37 2022-10-23 stsp done:
1477 13b2bc37 2022-10-23 stsp 	imsg_clear(&ibuf);
1478 13b2bc37 2022-10-23 stsp 	if (err)
1479 13b2bc37 2022-10-23 stsp 		echo_error(err, outfd, chattygot);
1480 13b2bc37 2022-10-23 stsp 	return err;
1481 13b2bc37 2022-10-23 stsp }
1482 13b2bc37 2022-10-23 stsp 
1483 13b2bc37 2022-10-23 stsp const struct got_error *
1484 9aeaf23a 2023-01-22 op got_serve(int infd, int outfd, const char *command, const char *repo_path,
1485 9aeaf23a 2023-01-22 op     int gotd_sock, int chattygot)
1486 13b2bc37 2022-10-23 stsp {
1487 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
1488 13b2bc37 2022-10-23 stsp 
1489 13b2bc37 2022-10-23 stsp 	if (strcmp(command, GOT_SERVE_CMD_FETCH) == 0)
1490 13b2bc37 2022-10-23 stsp 		err = serve_read(infd, outfd, gotd_sock, repo_path, chattygot);
1491 13b2bc37 2022-10-23 stsp 	else if (strcmp(command, GOT_SERVE_CMD_SEND) == 0)
1492 c808f450 2023-01-22 op 		err = serve_write(infd, outfd, gotd_sock, repo_path,
1493 c808f450 2023-01-22 op 		    chattygot);
1494 13b2bc37 2022-10-23 stsp 	else
1495 13b2bc37 2022-10-23 stsp 		err = got_error(GOT_ERR_BAD_PACKET);
1496 13b2bc37 2022-10-23 stsp 
1497 13b2bc37 2022-10-23 stsp 	return err;
1498 13b2bc37 2022-10-23 stsp }