1 /*
2  * Copyright (c) 2019, 2022 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/time.h>
18 #include <sys/types.h>
19 #include <sys/tree.h>
20 #include <sys/socket.h>
21 #include <sys/queue.h>
22 #include <sys/uio.h>
23 
24 #include <errno.h>
25 #include <fcntl.h>
26 #include <limits.h>
27 #include <sha1.h>
28 #include <sha2.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <stdint.h>
32 #include <imsg.h>
33 #include <unistd.h>
34 
35 #include <string.h>
36 
37 #include "got_error.h"
38 #include "got_object.h"
39 #include "got_repository.h"
40 #include "got_path.h"
41 
42 #include "got_lib_delta.h"
43 #include "got_lib_object.h"
44 #include "got_lib_object_cache.h"
45 #include "got_lib_privsep.h"
46 #include "got_lib_pack.h"
47 #include "got_lib_repository.h"
48 
49 const struct got_error *
50 got_repo_read_gitconfig(int *gitconfig_repository_format_version,
51     char **gitconfig_author_name, char **gitconfig_author_email,
52     struct got_remote_repo **remotes, int *nremotes,
53     char **gitconfig_owner, char **object_format,
54     char ***extensions, int *nextensions,
55     const char *gitconfig_path)
56 {
57 	const struct got_error *err = NULL, *child_err = NULL;
58 	int fd = -1;
59 	int imsg_fds[2] = { -1, -1 };
60 	pid_t pid;
61 	struct imsgbuf *ibuf;
62 
63 	*gitconfig_repository_format_version = 0;
64 	if (extensions)
65 		*extensions = NULL;
66 	if (nextensions)
67 		*nextensions = 0;
68 	*gitconfig_author_name = NULL;
69 	*gitconfig_author_email = NULL;
70 	if (remotes)
71 		*remotes = NULL;
72 	if (nremotes)
73 		*nremotes = 0;
74 	if (gitconfig_owner)
75 		*gitconfig_owner = NULL;
76 	if (object_format)
77 		*object_format = NULL;
78 
79 	fd = open(gitconfig_path, O_RDONLY | O_CLOEXEC);
80 	if (fd == -1) {
81 		if (errno == ENOENT)
82 			return NULL;
83 		return got_error_from_errno2("open", gitconfig_path);
84 	}
85 
86 	ibuf = calloc(1, sizeof(*ibuf));
87 	if (ibuf == NULL) {
88 		err = got_error_from_errno("calloc");
89 		goto done;
90 	}
91 
92 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
93 		err = got_error_from_errno("socketpair");
94 		goto done;
95 	}
96 
97 	pid = fork();
98 	if (pid == -1) {
99 		err = got_error_from_errno("fork");
100 		goto done;
101 	} else if (pid == 0) {
102 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_GITCONFIG,
103 		    gitconfig_path);
104 		/* not reached */
105 	}
106 
107 	if (close(imsg_fds[1]) == -1) {
108 		err = got_error_from_errno("close");
109 		goto done;
110 	}
111 	imsg_fds[1] = -1;
112 	imsg_init(ibuf, imsg_fds[0]);
113 
114 	err = got_privsep_send_gitconfig_parse_req(ibuf, fd);
115 	if (err)
116 		goto done;
117 	fd = -1;
118 
119 	err = got_privsep_send_gitconfig_repository_format_version_req(ibuf);
120 	if (err)
121 		goto done;
122 
123 	err = got_privsep_recv_gitconfig_int(
124 	    gitconfig_repository_format_version, ibuf);
125 	if (err)
126 		goto done;
127 
128 	if (extensions && nextensions) {
129 		err = got_privsep_send_gitconfig_repository_extensions_req(
130 		    ibuf);
131 		if (err)
132 			goto done;
133 		err = got_privsep_recv_gitconfig_int(nextensions, ibuf);
134 		if (err)
135 			goto done;
136 		if (*nextensions > 0) {
137 			int i;
138 			*extensions = calloc(*nextensions, sizeof(char *));
139 			if (*extensions == NULL) {
140 				err = got_error_from_errno("calloc");
141 				goto done;
142 			}
143 			for (i = 0; i < *nextensions; i++) {
144 				char *ext;
145 				err = got_privsep_recv_gitconfig_str(&ext,
146 				    ibuf);
147 				if (err)
148 					goto done;
149 				if (!strcmp(ext, "sha256"))
150 					*object_format = ext;
151 				(*extensions)[i] = ext;
152 			}
153 		}
154 	}
155 
156 	err = got_privsep_send_gitconfig_author_name_req(ibuf);
157 	if (err)
158 		goto done;
159 
160 	err = got_privsep_recv_gitconfig_str(gitconfig_author_name, ibuf);
161 	if (err)
162 		goto done;
163 
164 	err = got_privsep_send_gitconfig_author_email_req(ibuf);
165 	if (err)
166 		goto done;
167 
168 	err = got_privsep_recv_gitconfig_str(gitconfig_author_email, ibuf);
169 	if (err)
170 		goto done;
171 
172 	if (remotes && nremotes) {
173 		err = got_privsep_send_gitconfig_remotes_req(ibuf);
174 		if (err)
175 			goto done;
176 
177 		err = got_privsep_recv_gitconfig_remotes(remotes,
178 		    nremotes, ibuf);
179 		if (err)
180 			goto done;
181 	}
182 
183 	if (gitconfig_owner) {
184 		err = got_privsep_send_gitconfig_owner_req(ibuf);
185 		if (err)
186 			goto done;
187 		err = got_privsep_recv_gitconfig_str(gitconfig_owner, ibuf);
188 		if (err)
189 			goto done;
190 	}
191 
192 	err = got_privsep_send_stop(imsg_fds[0]);
193 	child_err = got_privsep_wait_for_child(pid);
194 	if (child_err && err == NULL)
195 		err = child_err;
196 done:
197 	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
198 		err = got_error_from_errno("close");
199 	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
200 		err = got_error_from_errno("close");
201 	if (fd != -1 && close(fd) == -1 && err == NULL)
202 		err = got_error_from_errno2("close", gitconfig_path);
203 	free(ibuf);
204 	return err;
205 }