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