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 <stdio.h>
29 #include <stdlib.h>
30 #include <stdint.h>
31 #include <imsg.h>
32 #include <unistd.h>
33 
34 #include "got_error.h"
35 #include "got_object.h"
36 #include "got_repository.h"
37 #include "got_path.h"
38 
39 #include "got_lib_delta.h"
40 #include "got_lib_object.h"
41 #include "got_lib_object_cache.h"
42 #include "got_lib_privsep.h"
43 #include "got_lib_pack.h"
44 #include "got_lib_repository.h"
45 
46 const struct got_error *
47 got_repo_read_gitconfig(int *gitconfig_repository_format_version,
48     char **gitconfig_author_name, char **gitconfig_author_email,
49     struct got_remote_repo **remotes, int *nremotes,
50     char **gitconfig_owner, char ***extnames, char ***extvals,
51     int *nextensions, const char *gitconfig_path)
52 {
53 	const struct got_error *err = NULL, *child_err = NULL;
54 	int fd = -1;
55 	int imsg_fds[2] = { -1, -1 };
56 	pid_t pid;
57 	struct imsgbuf *ibuf;
58 
59 	*gitconfig_repository_format_version = 0;
60 	if (extnames)
61 		*extnames = NULL;
62 	if (extvals)
63 		*extvals = NULL;
64 	if (nextensions)
65 		*nextensions = 0;
66 	*gitconfig_author_name = NULL;
67 	*gitconfig_author_email = NULL;
68 	if (remotes)
69 		*remotes = NULL;
70 	if (nremotes)
71 		*nremotes = 0;
72 	if (gitconfig_owner)
73 		*gitconfig_owner = NULL;
74 
75 	fd = open(gitconfig_path, O_RDONLY | O_CLOEXEC);
76 	if (fd == -1) {
77 		if (errno == ENOENT)
78 			return NULL;
79 		return got_error_from_errno2("open", gitconfig_path);
80 	}
81 
82 	ibuf = calloc(1, sizeof(*ibuf));
83 	if (ibuf == NULL) {
84 		err = got_error_from_errno("calloc");
85 		goto done;
86 	}
87 
88 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
89 		err = got_error_from_errno("socketpair");
90 		goto done;
91 	}
92 
93 	pid = fork();
94 	if (pid == -1) {
95 		err = got_error_from_errno("fork");
96 		goto done;
97 	} else if (pid == 0) {
98 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_GITCONFIG,
99 		    gitconfig_path);
100 		/* not reached */
101 	}
102 
103 	if (close(imsg_fds[1]) == -1) {
104 		err = got_error_from_errno("close");
105 		goto done;
106 	}
107 	imsg_fds[1] = -1;
108 	imsg_init(ibuf, imsg_fds[0]);
109 
110 	err = got_privsep_send_gitconfig_parse_req(ibuf, fd);
111 	if (err)
112 		goto done;
113 	fd = -1;
114 
115 	err = got_privsep_send_gitconfig_repository_format_version_req(ibuf);
116 	if (err)
117 		goto done;
118 
119 	err = got_privsep_recv_gitconfig_int(
120 	    gitconfig_repository_format_version, ibuf);
121 	if (err)
122 		goto done;
123 
124 	if (extnames && extvals && nextensions) {
125 		err = got_privsep_send_gitconfig_repository_extensions_req(
126 		    ibuf);
127 		if (err)
128 			goto done;
129 		err = got_privsep_recv_gitconfig_int(nextensions, ibuf);
130 		if (err)
131 			goto done;
132 		if (*nextensions > 0) {
133 			int i;
134 			*extnames = calloc(*nextensions, sizeof(char *));
135 			if (*extnames == NULL) {
136 				err = got_error_from_errno("calloc");
137 				goto done;
138 			}
139 			*extvals = calloc(*nextensions, sizeof(char *));
140 			if (*extvals == NULL) {
141 				err = got_error_from_errno("calloc");
142 				goto done;
143 			}
144 			for (i = 0; i < *nextensions; i++) {
145 				char *ext, *val;
146 				err = got_privsep_recv_gitconfig_pair(&ext,
147 				    &val, ibuf);
148 				if (err)
149 					goto done;
150 				(*extnames)[i] = ext;
151 				(*extvals)[i] = val;
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 }