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