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 "got_error.h"
36 #include "got_object.h"
37 #include "got_repository.h"
38 #include "got_path.h"
39 
40 #include "got_lib_delta.h"
41 #include "got_lib_object.h"
42 #include "got_lib_object_cache.h"
43 #include "got_lib_privsep.h"
44 #include "got_lib_pack.h"
45 #include "got_lib_repository.h"
46 
47 const struct got_error *
48 got_repo_read_gitconfig(int *gitconfig_repository_format_version,
49     char **gitconfig_author_name, char **gitconfig_author_email,
50     struct got_remote_repo **remotes, int *nremotes,
51     char **gitconfig_owner, char ***extnames, char ***extvals,
52     int *nextensions, const char *gitconfig_path)
53 {
54 	const struct got_error *err = NULL, *child_err = NULL;
55 	int fd = -1;
56 	int imsg_fds[2] = { -1, -1 };
57 	pid_t pid;
58 	struct imsgbuf *ibuf;
59 
60 	*gitconfig_repository_format_version = 0;
61 	if (extnames)
62 		*extnames = NULL;
63 	if (extvals)
64 		*extvals = NULL;
65 	if (nextensions)
66 		*nextensions = 0;
67 	*gitconfig_author_name = NULL;
68 	*gitconfig_author_email = NULL;
69 	if (remotes)
70 		*remotes = NULL;
71 	if (nremotes)
72 		*nremotes = 0;
73 	if (gitconfig_owner)
74 		*gitconfig_owner = NULL;
75 
76 	fd = open(gitconfig_path, O_RDONLY | O_CLOEXEC);
77 	if (fd == -1) {
78 		if (errno == ENOENT)
79 			return NULL;
80 		return got_error_from_errno2("open", gitconfig_path);
81 	}
82 
83 	ibuf = calloc(1, sizeof(*ibuf));
84 	if (ibuf == NULL) {
85 		err = got_error_from_errno("calloc");
86 		goto done;
87 	}
88 
89 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
90 		err = got_error_from_errno("socketpair");
91 		goto done;
92 	}
93 
94 	pid = fork();
95 	if (pid == -1) {
96 		err = got_error_from_errno("fork");
97 		goto done;
98 	} else if (pid == 0) {
99 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_GITCONFIG,
100 		    gitconfig_path);
101 		/* not reached */
102 	}
103 
104 	if (close(imsg_fds[1]) == -1) {
105 		err = got_error_from_errno("close");
106 		goto done;
107 	}
108 	imsg_fds[1] = -1;
109 	imsg_init(ibuf, imsg_fds[0]);
110 
111 	err = got_privsep_send_gitconfig_parse_req(ibuf, fd);
112 	if (err)
113 		goto done;
114 	fd = -1;
115 
116 	err = got_privsep_send_gitconfig_repository_format_version_req(ibuf);
117 	if (err)
118 		goto done;
119 
120 	err = got_privsep_recv_gitconfig_int(
121 	    gitconfig_repository_format_version, ibuf);
122 	if (err)
123 		goto done;
124 
125 	if (extnames && extvals && nextensions) {
126 		err = got_privsep_send_gitconfig_repository_extensions_req(
127 		    ibuf);
128 		if (err)
129 			goto done;
130 		err = got_privsep_recv_gitconfig_int(nextensions, ibuf);
131 		if (err)
132 			goto done;
133 		if (*nextensions > 0) {
134 			int i;
135 			*extnames = calloc(*nextensions, sizeof(char *));
136 			if (*extnames == NULL) {
137 				err = got_error_from_errno("calloc");
138 				goto done;
139 			}
140 			*extvals = calloc(*nextensions, sizeof(char *));
141 			if (*extvals == NULL) {
142 				err = got_error_from_errno("calloc");
143 				goto done;
144 			}
145 			for (i = 0; i < *nextensions; i++) {
146 				char *ext, *val;
147 				err = got_privsep_recv_gitconfig_pair(&ext,
148 				    &val, ibuf);
149 				if (err)
150 					goto done;
151 				(*extnames)[i] = ext;
152 				(*extvals)[i] = val;
153 			}
154 		}
155 	}
156 
157 	err = got_privsep_send_gitconfig_author_name_req(ibuf);
158 	if (err)
159 		goto done;
160 
161 	err = got_privsep_recv_gitconfig_str(gitconfig_author_name, ibuf);
162 	if (err)
163 		goto done;
164 
165 	err = got_privsep_send_gitconfig_author_email_req(ibuf);
166 	if (err)
167 		goto done;
168 
169 	err = got_privsep_recv_gitconfig_str(gitconfig_author_email, ibuf);
170 	if (err)
171 		goto done;
172 
173 	if (remotes && nremotes) {
174 		err = got_privsep_send_gitconfig_remotes_req(ibuf);
175 		if (err)
176 			goto done;
177 
178 		err = got_privsep_recv_gitconfig_remotes(remotes,
179 		    nremotes, ibuf);
180 		if (err)
181 			goto done;
182 	}
183 
184 	if (gitconfig_owner) {
185 		err = got_privsep_send_gitconfig_owner_req(ibuf);
186 		if (err)
187 			goto done;
188 		err = got_privsep_recv_gitconfig_str(gitconfig_owner, ibuf);
189 		if (err)
190 			goto done;
191 	}
192 
193 	err = got_privsep_send_stop(imsg_fds[0]);
194 	child_err = got_privsep_wait_for_child(pid);
195 	if (child_err && err == NULL)
196 		err = child_err;
197 done:
198 	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
199 		err = got_error_from_errno("close");
200 	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
201 		err = got_error_from_errno("close");
202 	if (fd != -1 && close(fd) == -1 && err == NULL)
203 		err = got_error_from_errno2("close", gitconfig_path);
204 	free(ibuf);
205 	return err;
206 }