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/types.h>
18 #include <sys/tree.h>
19 #include <sys/socket.h>
20 #include <sys/queue.h>
21 #include <sys/uio.h>
22 
23 #include <errno.h>
24 #include <fcntl.h>
25 #include <limits.h>
26 #include <sha1.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <stdint.h>
30 #include <imsg.h>
31 #include <unistd.h>
32 
33 #include "got_error.h"
34 #include "got_object.h"
35 #include "got_repository.h"
36 #include "got_path.h"
37 
38 #include "got_lib_delta.h"
39 #include "got_lib_object.h"
40 #include "got_lib_object_cache.h"
41 #include "got_lib_privsep.h"
42 #include "got_lib_pack.h"
43 #include "got_lib_repository.h"
44 
45 const struct got_error *
46 got_repo_read_gitconfig(int *gitconfig_repository_format_version,
47     char **gitconfig_author_name, char **gitconfig_author_email,
48     struct got_remote_repo **remotes, int *nremotes,
49     char **gitconfig_owner, char ***extensions, int *nextensions,
50     const char *gitconfig_path)
51 {
52 	const struct got_error *err = NULL, *child_err = NULL;
53 	int fd = -1;
54 	int imsg_fds[2] = { -1, -1 };
55 	pid_t pid;
56 	struct imsgbuf *ibuf;
57 
58 	*gitconfig_repository_format_version = 0;
59 	if (extensions)
60 		*extensions = NULL;
61 	if (nextensions)
62 		*nextensions = 0;
63 	*gitconfig_author_name = NULL;
64 	*gitconfig_author_email = NULL;
65 	if (remotes)
66 		*remotes = NULL;
67 	if (nremotes)
68 		*nremotes = 0;
69 	if (gitconfig_owner)
70 		*gitconfig_owner = NULL;
71 
72 	fd = open(gitconfig_path, O_RDONLY | O_CLOEXEC);
73 	if (fd == -1) {
74 		if (errno == ENOENT)
75 			return NULL;
76 		return got_error_from_errno2("open", gitconfig_path);
77 	}
78 
79 	ibuf = calloc(1, sizeof(*ibuf));
80 	if (ibuf == NULL) {
81 		err = got_error_from_errno("calloc");
82 		goto done;
83 	}
84 
85 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
86 		err = got_error_from_errno("socketpair");
87 		goto done;
88 	}
89 
90 	pid = fork();
91 	if (pid == -1) {
92 		err = got_error_from_errno("fork");
93 		goto done;
94 	} else if (pid == 0) {
95 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_GITCONFIG,
96 		    gitconfig_path);
97 		/* not reached */
98 	}
99 
100 	if (close(imsg_fds[1]) == -1) {
101 		err = got_error_from_errno("close");
102 		goto done;
103 	}
104 	imsg_fds[1] = -1;
105 	imsg_init(ibuf, imsg_fds[0]);
106 
107 	err = got_privsep_send_gitconfig_parse_req(ibuf, fd);
108 	if (err)
109 		goto done;
110 	fd = -1;
111 
112 	err = got_privsep_send_gitconfig_repository_format_version_req(ibuf);
113 	if (err)
114 		goto done;
115 
116 	err = got_privsep_recv_gitconfig_int(
117 	    gitconfig_repository_format_version, ibuf);
118 	if (err)
119 		goto done;
120 
121 	if (extensions && nextensions) {
122 		err = got_privsep_send_gitconfig_repository_extensions_req(
123 		    ibuf);
124 		if (err)
125 			goto done;
126 		err = got_privsep_recv_gitconfig_int(nextensions, ibuf);
127 		if (err)
128 			goto done;
129 		if (*nextensions > 0) {
130 			int i;
131 			*extensions = calloc(*nextensions, sizeof(char *));
132 			if (*extensions == NULL) {
133 				err = got_error_from_errno("calloc");
134 				goto done;
135 			}
136 			for (i = 0; i < *nextensions; i++) {
137 				char *ext;
138 				err = got_privsep_recv_gitconfig_str(&ext,
139 				    ibuf);
140 				if (err)
141 					goto done;
142 				(*extensions)[i] = ext;
143 			}
144 		}
145 	}
146 
147 	err = got_privsep_send_gitconfig_author_name_req(ibuf);
148 	if (err)
149 		goto done;
150 
151 	err = got_privsep_recv_gitconfig_str(gitconfig_author_name, ibuf);
152 	if (err)
153 		goto done;
154 
155 	err = got_privsep_send_gitconfig_author_email_req(ibuf);
156 	if (err)
157 		goto done;
158 
159 	err = got_privsep_recv_gitconfig_str(gitconfig_author_email, ibuf);
160 	if (err)
161 		goto done;
162 
163 	if (remotes && nremotes) {
164 		err = got_privsep_send_gitconfig_remotes_req(ibuf);
165 		if (err)
166 			goto done;
167 
168 		err = got_privsep_recv_gitconfig_remotes(remotes,
169 		    nremotes, ibuf);
170 		if (err)
171 			goto done;
172 	}
173 
174 	if (gitconfig_owner) {
175 		err = got_privsep_send_gitconfig_owner_req(ibuf);
176 		if (err)
177 			goto done;
178 		err = got_privsep_recv_gitconfig_str(gitconfig_owner, ibuf);
179 		if (err)
180 			goto done;
181 	}
182 
183 	err = got_privsep_send_stop(imsg_fds[0]);
184 	child_err = got_privsep_wait_for_child(pid);
185 	if (child_err && err == NULL)
186 		err = child_err;
187 done:
188 	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
189 		err = got_error_from_errno("close");
190 	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
191 		err = got_error_from_errno("close");
192 	if (fd != -1 && close(fd) == -1 && err == NULL)
193 		err = got_error_from_errno2("close", gitconfig_path);
194 	free(ibuf);
195 	return err;
196 }