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/queue.h>
 18 13b2bc37 2022-10-23 stsp #include <sys/types.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 <imsg.h>
 24 13b2bc37 2022-10-23 stsp #include <limits.h>
 25 13b2bc37 2022-10-23 stsp #include <poll.h>
 26 13b2bc37 2022-10-23 stsp #include <sha1.h>
 27 13b2bc37 2022-10-23 stsp #include <stdio.h>
 28 13b2bc37 2022-10-23 stsp #include <string.h>
 29 13b2bc37 2022-10-23 stsp #include <unistd.h>
 30 13b2bc37 2022-10-23 stsp 
 31 13b2bc37 2022-10-23 stsp #include "got_error.h"
 32 13b2bc37 2022-10-23 stsp 
 33 13b2bc37 2022-10-23 stsp #include "got_lib_poll.h"
 34 13b2bc37 2022-10-23 stsp 
 35 13b2bc37 2022-10-23 stsp #include "gotd.h"
 36 13b2bc37 2022-10-23 stsp 
 37 13b2bc37 2022-10-23 stsp const struct got_error *
 38 13b2bc37 2022-10-23 stsp gotd_imsg_recv_error(uint32_t *client_id, struct imsg *imsg)
 39 13b2bc37 2022-10-23 stsp {
 40 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_error ierr;
 41 13b2bc37 2022-10-23 stsp 	size_t datalen;
 42 13b2bc37 2022-10-23 stsp 
 43 13b2bc37 2022-10-23 stsp 	datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
 44 13b2bc37 2022-10-23 stsp 	if (datalen != sizeof(ierr))
 45 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
 46 13b2bc37 2022-10-23 stsp 	memcpy(&ierr, imsg->data, sizeof(ierr));
 47 13b2bc37 2022-10-23 stsp 
 48 13b2bc37 2022-10-23 stsp 	if (client_id)
 49 13b2bc37 2022-10-23 stsp 		*client_id = ierr.client_id;
 50 13b2bc37 2022-10-23 stsp 
 51 13b2bc37 2022-10-23 stsp 	if (ierr.code == GOT_ERR_ERRNO)
 52 13b2bc37 2022-10-23 stsp 		errno = ierr.errno_code;
 53 13b2bc37 2022-10-23 stsp 
 54 13b2bc37 2022-10-23 stsp 	return got_error_msg(ierr.code, ierr.msg);
 55 13b2bc37 2022-10-23 stsp }
 56 13b2bc37 2022-10-23 stsp 
 57 13b2bc37 2022-10-23 stsp const struct got_error *
 58 13b2bc37 2022-10-23 stsp gotd_imsg_flush(struct imsgbuf *ibuf)
 59 13b2bc37 2022-10-23 stsp {
 60 522b5488 2022-12-03 stsp 	const struct got_error *err = NULL;
 61 13b2bc37 2022-10-23 stsp 
 62 522b5488 2022-12-03 stsp 	while (ibuf->w.queued > 0) {
 63 522b5488 2022-12-03 stsp 		err = got_poll_fd(ibuf->fd, POLLOUT, INFTIM);
 64 522b5488 2022-12-03 stsp 		if (err)
 65 522b5488 2022-12-03 stsp 			break;
 66 13b2bc37 2022-10-23 stsp 
 67 522b5488 2022-12-03 stsp 		if (imsg_flush(ibuf) == -1) {
 68 522b5488 2022-12-03 stsp 			if (errno != EAGAIN) {
 69 522b5488 2022-12-03 stsp 				imsg_clear(ibuf);
 70 522b5488 2022-12-03 stsp 				err = got_error_from_errno("imsg_flush");
 71 522b5488 2022-12-03 stsp 				break;
 72 522b5488 2022-12-03 stsp 			}
 73 522b5488 2022-12-03 stsp 		}
 74 522b5488 2022-12-03 stsp 	}	
 75 13b2bc37 2022-10-23 stsp 
 76 522b5488 2022-12-03 stsp 	return err;
 77 13b2bc37 2022-10-23 stsp }
 78 13b2bc37 2022-10-23 stsp 
 79 13b2bc37 2022-10-23 stsp const struct got_error *
 80 13b2bc37 2022-10-23 stsp gotd_imsg_recv(struct imsg *imsg, struct imsgbuf *ibuf, size_t min_datalen)
 81 13b2bc37 2022-10-23 stsp {
 82 13b2bc37 2022-10-23 stsp 	ssize_t n;
 83 13b2bc37 2022-10-23 stsp 
 84 13b2bc37 2022-10-23 stsp 	n = imsg_get(ibuf, imsg);
 85 13b2bc37 2022-10-23 stsp 	if (n == -1)
 86 13b2bc37 2022-10-23 stsp 		return got_error_from_errno("imsg_get");
 87 13b2bc37 2022-10-23 stsp 
 88 13b2bc37 2022-10-23 stsp 	if (n == 0) {
 89 13b2bc37 2022-10-23 stsp 		n = imsg_read(ibuf);
 90 13b2bc37 2022-10-23 stsp 		if (n == -1) {
 91 13b2bc37 2022-10-23 stsp 			if (errno == EAGAIN)
 92 13b2bc37 2022-10-23 stsp 				return got_error(GOT_ERR_PRIVSEP_READ);
 93 13b2bc37 2022-10-23 stsp 			return got_error_from_errno("imsg_read");
 94 13b2bc37 2022-10-23 stsp 		}
 95 13b2bc37 2022-10-23 stsp 		if (n == 0)
 96 13b2bc37 2022-10-23 stsp 			return got_error(GOT_ERR_EOF);
 97 13b2bc37 2022-10-23 stsp 		n = imsg_get(ibuf, imsg);
 98 13b2bc37 2022-10-23 stsp 		if (n == -1)
 99 13b2bc37 2022-10-23 stsp 			return got_error_from_errno("imsg_get");
100 13b2bc37 2022-10-23 stsp 	}
101 13b2bc37 2022-10-23 stsp 
102 13b2bc37 2022-10-23 stsp 	if (imsg->hdr.len < IMSG_HEADER_SIZE + min_datalen)
103 13b2bc37 2022-10-23 stsp 		return got_error(GOT_ERR_PRIVSEP_LEN);
104 13b2bc37 2022-10-23 stsp 
105 13b2bc37 2022-10-23 stsp 	return NULL;
106 13b2bc37 2022-10-23 stsp }
107 13b2bc37 2022-10-23 stsp 
108 13b2bc37 2022-10-23 stsp const struct got_error *
109 13b2bc37 2022-10-23 stsp gotd_imsg_poll_recv(struct imsg *imsg, struct imsgbuf *ibuf, size_t min_datalen)
110 13b2bc37 2022-10-23 stsp {
111 13b2bc37 2022-10-23 stsp 	const struct got_error *err = NULL;
112 13b2bc37 2022-10-23 stsp 
113 13b2bc37 2022-10-23 stsp 	for (;;) {
114 13b2bc37 2022-10-23 stsp 		err = gotd_imsg_recv(imsg, ibuf, min_datalen);
115 13b2bc37 2022-10-23 stsp 		if (err == NULL || err->code != GOT_ERR_PRIVSEP_READ)
116 13b2bc37 2022-10-23 stsp 			return err;
117 13b2bc37 2022-10-23 stsp 
118 13b2bc37 2022-10-23 stsp 		err = got_poll_fd(ibuf->fd, POLLIN, INFTIM);
119 13b2bc37 2022-10-23 stsp 		if (err)
120 13b2bc37 2022-10-23 stsp 			break;
121 13b2bc37 2022-10-23 stsp 	}
122 13b2bc37 2022-10-23 stsp 
123 13b2bc37 2022-10-23 stsp 	return err;
124 13b2bc37 2022-10-23 stsp }
125 13b2bc37 2022-10-23 stsp 
126 13b2bc37 2022-10-23 stsp int
127 13b2bc37 2022-10-23 stsp gotd_imsg_send_error(struct imsgbuf *ibuf, uint32_t peerid,
128 13b2bc37 2022-10-23 stsp     uint32_t client_id, const struct got_error *err)
129 13b2bc37 2022-10-23 stsp {
130 13b2bc37 2022-10-23 stsp 	const struct got_error *flush_err;
131 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_error ierr;
132 13b2bc37 2022-10-23 stsp 	int ret;
133 13b2bc37 2022-10-23 stsp 
134 13b2bc37 2022-10-23 stsp 	ierr.code = err->code;
135 13b2bc37 2022-10-23 stsp 	if (err->code == GOT_ERR_ERRNO)
136 13b2bc37 2022-10-23 stsp 		ierr.errno_code = errno;
137 13b2bc37 2022-10-23 stsp 	else
138 13b2bc37 2022-10-23 stsp 		ierr.errno_code = 0;
139 13b2bc37 2022-10-23 stsp 	ierr.client_id = client_id;
140 13b2bc37 2022-10-23 stsp 	strlcpy(ierr.msg, err->msg, sizeof(ierr.msg));
141 13b2bc37 2022-10-23 stsp 
142 13b2bc37 2022-10-23 stsp 	ret = imsg_compose(ibuf, GOTD_IMSG_ERROR, peerid, getpid(), -1,
143 13b2bc37 2022-10-23 stsp 	    &ierr, sizeof(ierr));
144 13b2bc37 2022-10-23 stsp 	if (ret == -1)
145 13b2bc37 2022-10-23 stsp 		return -1;
146 13b2bc37 2022-10-23 stsp 
147 13b2bc37 2022-10-23 stsp 	flush_err = gotd_imsg_flush(ibuf);
148 13b2bc37 2022-10-23 stsp 	if (flush_err)
149 13b2bc37 2022-10-23 stsp 		return -1;
150 13b2bc37 2022-10-23 stsp 
151 13b2bc37 2022-10-23 stsp 	return 0;
152 13b2bc37 2022-10-23 stsp }
153 13b2bc37 2022-10-23 stsp 
154 13b2bc37 2022-10-23 stsp int
155 13b2bc37 2022-10-23 stsp gotd_imsg_send_error_event(struct gotd_imsgev *iev, uint32_t peerid,
156 13b2bc37 2022-10-23 stsp     uint32_t client_id, const struct got_error *err)
157 13b2bc37 2022-10-23 stsp {
158 13b2bc37 2022-10-23 stsp 	struct gotd_imsg_error ierr;
159 13b2bc37 2022-10-23 stsp 	int ret;
160 13b2bc37 2022-10-23 stsp 
161 13b2bc37 2022-10-23 stsp 	ierr.code = err->code;
162 13b2bc37 2022-10-23 stsp 	if (err->code == GOT_ERR_ERRNO)
163 13b2bc37 2022-10-23 stsp 		ierr.errno_code = errno;
164 13b2bc37 2022-10-23 stsp 	else
165 13b2bc37 2022-10-23 stsp 		ierr.errno_code = 0;
166 13b2bc37 2022-10-23 stsp 	ierr.client_id = client_id;
167 13b2bc37 2022-10-23 stsp 	strlcpy(ierr.msg, err->msg, sizeof(ierr.msg));
168 13b2bc37 2022-10-23 stsp 
169 13b2bc37 2022-10-23 stsp 	ret = gotd_imsg_compose_event(iev, GOTD_IMSG_ERROR, peerid, -1,
170 13b2bc37 2022-10-23 stsp 	    &ierr, sizeof(ierr));
171 13b2bc37 2022-10-23 stsp 	if (ret == -1)
172 13b2bc37 2022-10-23 stsp 		return -1;
173 13b2bc37 2022-10-23 stsp 
174 13b2bc37 2022-10-23 stsp 	return 0;
175 13b2bc37 2022-10-23 stsp }
176 13b2bc37 2022-10-23 stsp 
177 13b2bc37 2022-10-23 stsp void
178 13b2bc37 2022-10-23 stsp gotd_imsg_event_add(struct gotd_imsgev *iev)
179 13b2bc37 2022-10-23 stsp {
180 13b2bc37 2022-10-23 stsp 	iev->events = EV_READ;
181 13b2bc37 2022-10-23 stsp 	if (iev->ibuf.w.queued)
182 13b2bc37 2022-10-23 stsp 		iev->events |= EV_WRITE;
183 13b2bc37 2022-10-23 stsp 
184 13b2bc37 2022-10-23 stsp 	event_del(&iev->ev);
185 13b2bc37 2022-10-23 stsp 	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
186 13b2bc37 2022-10-23 stsp 	event_add(&iev->ev, NULL);
187 13b2bc37 2022-10-23 stsp }
188 13b2bc37 2022-10-23 stsp 
189 13b2bc37 2022-10-23 stsp int
190 13b2bc37 2022-10-23 stsp gotd_imsg_compose_event(struct gotd_imsgev *iev, uint16_t type, uint32_t peerid,
191 13b2bc37 2022-10-23 stsp     int fd, void *data, uint16_t datalen)
192 13b2bc37 2022-10-23 stsp {
193 13b2bc37 2022-10-23 stsp 	int ret;
194 13b2bc37 2022-10-23 stsp 
195 13b2bc37 2022-10-23 stsp 	ret = imsg_compose(&iev->ibuf, type, peerid, getpid(), fd,
196 13b2bc37 2022-10-23 stsp 	    data, datalen);
197 13b2bc37 2022-10-23 stsp 	if (ret != -1)
198 13b2bc37 2022-10-23 stsp 		gotd_imsg_event_add(iev);
199 13b2bc37 2022-10-23 stsp 
200 13b2bc37 2022-10-23 stsp 	return ret;
201 13b2bc37 2022-10-23 stsp }
202 13b2bc37 2022-10-23 stsp 
203 13b2bc37 2022-10-23 stsp int
204 13b2bc37 2022-10-23 stsp gotd_imsg_forward(struct gotd_imsgev *iev, struct imsg *imsg, int fd)
205 13b2bc37 2022-10-23 stsp {
206 13b2bc37 2022-10-23 stsp 	return gotd_imsg_compose_event(iev, imsg->hdr.type, imsg->hdr.peerid,
207 13b2bc37 2022-10-23 stsp 	    fd, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE);
208 13b2bc37 2022-10-23 stsp }