1 /*
2  * Copyright (c) 2020 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/queue.h>
19 #include <sys/uio.h>
20 #include <sys/socket.h>
21 
22 #include <unistd.h>
23 #include <fcntl.h>
24 #include <errno.h>
25 #include <stdlib.h>
26 #include <stdio.h>
27 #include <stdint.h>
28 #include <imsg.h>
29 #include <sha1.h>
30 #include <limits.h>
31 
32 #include "got_error.h"
33 #include "got_object.h"
34 #include "got_repository.h"
35 
36 #include "got_lib_delta.h"
37 #include "got_lib_object.h"
38 #include "got_lib_privsep.h"
39 #include "got_lib_gotconfig.h"
40 
41 #include "got_gotconfig.h"
42 
43 const struct got_error *
44 got_gotconfig_read(struct got_gotconfig **conf, const char *gotconfig_path)
45 {
46 	const struct got_error *err = NULL, *child_err = NULL;
47 	int fd = -1;
48 	int imsg_fds[2] = { -1, -1 };
49 	pid_t pid;
50 	struct imsgbuf *ibuf;
51 
52 	*conf = calloc(1, sizeof(**conf));
53 	if (*conf == NULL)
54 		return got_error_from_errno("calloc");
55 
56 	fd = open(gotconfig_path, O_RDONLY | O_CLOEXEC);
57 	if (fd == -1) {
58 		if (errno == ENOENT)
59 			return NULL;
60 		return got_error_from_errno2("open", gotconfig_path);
61 	}
62 
63 	ibuf = calloc(1, sizeof(*ibuf));
64 	if (ibuf == NULL) {
65 		err = got_error_from_errno("calloc");
66 		goto done;
67 	}
68 
69 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
70 		err = got_error_from_errno("socketpair");
71 		goto done;
72 	}
73 
74 	pid = fork();
75 	if (pid == -1) {
76 		err = got_error_from_errno("fork");
77 		goto done;
78 	} else if (pid == 0) {
79 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_GOTCONFIG,
80 		    gotconfig_path);
81 		/* not reached */
82 	}
83 
84 	if (close(imsg_fds[1]) == -1) {
85 		err = got_error_from_errno("close");
86 		goto done;
87 	}
88 	imsg_fds[1] = -1;
89 	imsg_init(ibuf, imsg_fds[0]);
90 
91 	err = got_privsep_send_gotconfig_parse_req(ibuf, fd);
92 	if (err)
93 		goto done;
94 	fd = -1;
95 
96 	err = got_privsep_send_gotconfig_author_req(ibuf);
97 	if (err)
98 		goto done;
99 
100 	err = got_privsep_recv_gotconfig_str(&(*conf)->author, ibuf);
101 	if (err)
102 		goto done;
103 
104 	err = got_privsep_send_gotconfig_remotes_req(ibuf);
105 	if (err)
106 		goto done;
107 
108 	err = got_privsep_recv_gotconfig_remotes(&(*conf)->remotes,
109 	    &(*conf)->nremotes, ibuf);
110 	if (err)
111 		goto done;
112 
113 	err = got_privsep_send_stop(imsg_fds[0]);
114 	child_err = got_privsep_wait_for_child(pid);
115 	if (child_err && err == NULL)
116 		err = child_err;
117 done:
118 	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
119 		err = got_error_from_errno("close");
120 	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
121 		err = got_error_from_errno("close");
122 	if (fd != -1 && close(fd) == -1 && err == NULL)
123 		err = got_error_from_errno2("close", gotconfig_path);
124 	if (err) {
125 		got_gotconfig_free(*conf);
126 		*conf = NULL;
127 	}
128 	free(ibuf);
129 	return err;
130 }
131 
132 void
133 got_gotconfig_free(struct got_gotconfig *conf)
134 {
135 	int i;
136 
137 	if (conf == NULL)
138 		return;
139 
140 	free(conf->author);
141 
142 	for (i = 0; i < conf->nremotes; i++)
143 		got_repo_free_remote_repo_data(&conf->remotes[i]);
144 	free(conf->remotes);
145 	free(conf);
146 }
147 
148 const char *
149 got_gotconfig_get_author(const struct got_gotconfig *conf)
150 {
151 	return conf->author;
152 }
153 
154 void
155 got_gotconfig_get_remotes(int *nremotes, const struct got_remote_repo **remotes,
156     const struct got_gotconfig *conf)
157 {
158 	*nremotes = conf->nremotes;
159 	*remotes = conf->remotes;
160 }