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_compat.h"
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 ***extnames, char ***extvals,
50     int *nextensions, 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 (extnames)
60 		*extnames = NULL;
61 	if (extvals)
62 		*extvals = NULL;
63 	if (nextensions)
64 		*nextensions = 0;
65 	*gitconfig_author_name = NULL;
66 	*gitconfig_author_email = NULL;
67 	if (remotes)
68 		*remotes = NULL;
69 	if (nremotes)
70 		*nremotes = 0;
71 	if (gitconfig_owner)
72 		*gitconfig_owner = NULL;
73 
74 	fd = open(gitconfig_path, O_RDONLY | O_CLOEXEC);
75 	if (fd == -1) {
76 		if (errno == ENOENT)
77 			return NULL;
78 		return got_error_from_errno2("open", gitconfig_path);
79 	}
80 
81 	ibuf = calloc(1, sizeof(*ibuf));
82 	if (ibuf == NULL) {
83 		err = got_error_from_errno("calloc");
84 		goto done;
85 	}
86 
87 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
88 		err = got_error_from_errno("socketpair");
89 		goto done;
90 	}
91 
92 	pid = fork();
93 	if (pid == -1) {
94 		err = got_error_from_errno("fork");
95 		goto done;
96 	} else if (pid == 0) {
97 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_GITCONFIG,
98 		    gitconfig_path);
99 		/* not reached */
100 	}
101 
102 	if (close(imsg_fds[1]) == -1) {
103 		err = got_error_from_errno("close");
104 		goto done;
105 	}
106 	imsg_fds[1] = -1;
107 	imsg_init(ibuf, imsg_fds[0]);
108 
109 	err = got_privsep_send_gitconfig_parse_req(ibuf, fd);
110 	if (err)
111 		goto done;
112 	fd = -1;
113 
114 	err = got_privsep_send_gitconfig_repository_format_version_req(ibuf);
115 	if (err)
116 		goto done;
117 
118 	err = got_privsep_recv_gitconfig_int(
119 	    gitconfig_repository_format_version, ibuf);
120 	if (err)
121 		goto done;
122 
123 	if (extnames && extvals && nextensions) {
124 		err = got_privsep_send_gitconfig_repository_extensions_req(
125 		    ibuf);
126 		if (err)
127 			goto done;
128 		err = got_privsep_recv_gitconfig_int(nextensions, ibuf);
129 		if (err)
130 			goto done;
131 		if (*nextensions > 0) {
132 			int i;
133 			*extnames = calloc(*nextensions, sizeof(char *));
134 			if (*extnames == NULL) {
135 				err = got_error_from_errno("calloc");
136 				goto done;
137 			}
138 			*extvals = calloc(*nextensions, sizeof(char *));
139 			if (*extvals == NULL) {
140 				err = got_error_from_errno("calloc");
141 				goto done;
142 			}
143 			for (i = 0; i < *nextensions; i++) {
144 				char *ext, *val;
145 				err = got_privsep_recv_gitconfig_pair(&ext,
146 				    &val, ibuf);
147 				if (err)
148 					goto done;
149 				(*extnames)[i] = ext;
150 				(*extvals)[i] = val;
151 			}
152 		}
153 	}
154 
155 	err = got_privsep_send_gitconfig_author_name_req(ibuf);
156 	if (err)
157 		goto done;
158 
159 	err = got_privsep_recv_gitconfig_str(gitconfig_author_name, ibuf);
160 	if (err)
161 		goto done;
162 
163 	err = got_privsep_send_gitconfig_author_email_req(ibuf);
164 	if (err)
165 		goto done;
166 
167 	err = got_privsep_recv_gitconfig_str(gitconfig_author_email, ibuf);
168 	if (err)
169 		goto done;
170 
171 	if (remotes && nremotes) {
172 		err = got_privsep_send_gitconfig_remotes_req(ibuf);
173 		if (err)
174 			goto done;
175 
176 		err = got_privsep_recv_gitconfig_remotes(remotes,
177 		    nremotes, ibuf);
178 		if (err)
179 			goto done;
180 	}
181 
182 	if (gitconfig_owner) {
183 		err = got_privsep_send_gitconfig_owner_req(ibuf);
184 		if (err)
185 			goto done;
186 		err = got_privsep_recv_gitconfig_str(gitconfig_owner, ibuf);
187 		if (err)
188 			goto done;
189 	}
190 
191 	err = got_privsep_send_stop(imsg_fds[0]);
192 	child_err = got_privsep_wait_for_child(pid);
193 	if (child_err && err == NULL)
194 		err = child_err;
195 done:
196 	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
197 		err = got_error_from_errno("close");
198 	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
199 		err = got_error_from_errno("close");
200 	if (fd != -1 && close(fd) == -1 && err == NULL)
201 		err = got_error_from_errno2("close", gitconfig_path);
202 	free(ibuf);
203 	return err;
204 }