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 ***extensions, int *nextensions,
51     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 (extensions)
61 		*extensions = NULL;
62 	if (nextensions)
63 		*nextensions = 0;
64 	*gitconfig_author_name = NULL;
65 	*gitconfig_author_email = NULL;
66 	if (remotes)
67 		*remotes = NULL;
68 	if (nremotes)
69 		*nremotes = 0;
70 	if (gitconfig_owner)
71 		*gitconfig_owner = NULL;
72 
73 	fd = open(gitconfig_path, O_RDONLY | O_CLOEXEC);
74 	if (fd == -1) {
75 		if (errno == ENOENT)
76 			return NULL;
77 		return got_error_from_errno2("open", gitconfig_path);
78 	}
79 
80 	ibuf = calloc(1, sizeof(*ibuf));
81 	if (ibuf == NULL) {
82 		err = got_error_from_errno("calloc");
83 		goto done;
84 	}
85 
86 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
87 		err = got_error_from_errno("socketpair");
88 		goto done;
89 	}
90 
91 	pid = fork();
92 	if (pid == -1) {
93 		err = got_error_from_errno("fork");
94 		goto done;
95 	} else if (pid == 0) {
96 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_GITCONFIG,
97 		    gitconfig_path);
98 		/* not reached */
99 	}
100 
101 	if (close(imsg_fds[1]) == -1) {
102 		err = got_error_from_errno("close");
103 		goto done;
104 	}
105 	imsg_fds[1] = -1;
106 	imsg_init(ibuf, imsg_fds[0]);
107 
108 	err = got_privsep_send_gitconfig_parse_req(ibuf, fd);
109 	if (err)
110 		goto done;
111 	fd = -1;
112 
113 	err = got_privsep_send_gitconfig_repository_format_version_req(ibuf);
114 	if (err)
115 		goto done;
116 
117 	err = got_privsep_recv_gitconfig_int(
118 	    gitconfig_repository_format_version, ibuf);
119 	if (err)
120 		goto done;
121 
122 	if (extensions && nextensions) {
123 		err = got_privsep_send_gitconfig_repository_extensions_req(
124 		    ibuf);
125 		if (err)
126 			goto done;
127 		err = got_privsep_recv_gitconfig_int(nextensions, ibuf);
128 		if (err)
129 			goto done;
130 		if (*nextensions > 0) {
131 			int i;
132 			*extensions = calloc(*nextensions, sizeof(char *));
133 			if (*extensions == NULL) {
134 				err = got_error_from_errno("calloc");
135 				goto done;
136 			}
137 			for (i = 0; i < *nextensions; i++) {
138 				char *ext;
139 				err = got_privsep_recv_gitconfig_str(&ext,
140 				    ibuf);
141 				if (err)
142 					goto done;
143 				(*extensions)[i] = ext;
144 			}
145 		}
146 	}
147 
148 	err = got_privsep_send_gitconfig_author_name_req(ibuf);
149 	if (err)
150 		goto done;
151 
152 	err = got_privsep_recv_gitconfig_str(gitconfig_author_name, ibuf);
153 	if (err)
154 		goto done;
155 
156 	err = got_privsep_send_gitconfig_author_email_req(ibuf);
157 	if (err)
158 		goto done;
159 
160 	err = got_privsep_recv_gitconfig_str(gitconfig_author_email, ibuf);
161 	if (err)
162 		goto done;
163 
164 	if (remotes && nremotes) {
165 		err = got_privsep_send_gitconfig_remotes_req(ibuf);
166 		if (err)
167 			goto done;
168 
169 		err = got_privsep_recv_gitconfig_remotes(remotes,
170 		    nremotes, ibuf);
171 		if (err)
172 			goto done;
173 	}
174 
175 	if (gitconfig_owner) {
176 		err = got_privsep_send_gitconfig_owner_req(ibuf);
177 		if (err)
178 			goto done;
179 		err = got_privsep_recv_gitconfig_str(gitconfig_owner, ibuf);
180 		if (err)
181 			goto done;
182 	}
183 
184 	err = got_privsep_send_stop(imsg_fds[0]);
185 	child_err = got_privsep_wait_for_child(pid);
186 	if (child_err && err == NULL)
187 		err = child_err;
188 done:
189 	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
190 		err = got_error_from_errno("close");
191 	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
192 		err = got_error_from_errno("close");
193 	if (fd != -1 && close(fd) == -1 && err == NULL)
194 		err = got_error_from_errno2("close", gitconfig_path);
195 	free(ibuf);
196 	return err;
197 }