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