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 const struct got_error *
42 got_gotconfig_read(struct got_gotconfig **conf, const char *gotconfig_path)
43 {
44 	const struct got_error *err = NULL, *child_err = NULL;
45 	int fd = -1;
46 	int imsg_fds[2] = { -1, -1 };
47 	pid_t pid;
48 	struct imsgbuf *ibuf;
49 
50 	*conf = calloc(1, sizeof(**conf));
51 	if (*conf == NULL)
52 		return got_error_from_errno("calloc");
53 
54 	fd = open(gotconfig_path, O_RDONLY);
55 	if (fd == -1) {
56 		if (errno == ENOENT)
57 			return NULL;
58 		return got_error_from_errno2("open", gotconfig_path);
59 	}
60 
61 	ibuf = calloc(1, sizeof(*ibuf));
62 	if (ibuf == NULL) {
63 		err = got_error_from_errno("calloc");
64 		goto done;
65 	}
66 
67 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
68 		err = got_error_from_errno("socketpair");
69 		goto done;
70 	}
71 
72 	pid = fork();
73 	if (pid == -1) {
74 		err = got_error_from_errno("fork");
75 		goto done;
76 	} else if (pid == 0) {
77 		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_GOTCONFIG,
78 		    gotconfig_path);
79 		/* not reached */
80 	}
81 
82 	if (close(imsg_fds[1]) == -1) {
83 		err = got_error_from_errno("close");
84 		goto done;
85 	}
86 	imsg_fds[1] = -1;
87 	imsg_init(ibuf, imsg_fds[0]);
88 
89 	err = got_privsep_send_gotconfig_parse_req(ibuf, fd);
90 	if (err)
91 		goto done;
92 	fd = -1;
93 
94 	err = got_privsep_send_gotconfig_author_req(ibuf);
95 	if (err)
96 		goto done;
97 
98 	err = got_privsep_recv_gotconfig_str(&(*conf)->author, ibuf);
99 	if (err)
100 		goto done;
101 
102 	err = got_privsep_send_gotconfig_remotes_req(ibuf);
103 	if (err)
104 		goto done;
105 
106 	err = got_privsep_recv_gotconfig_remotes(&(*conf)->remotes,
107 	    &(*conf)->nremotes, ibuf);
108 	if (err)
109 		goto done;
110 
111 	imsg_clear(ibuf);
112 	err = got_privsep_send_stop(imsg_fds[0]);
113 	child_err = got_privsep_wait_for_child(pid);
114 	if (child_err && err == NULL)
115 		err = child_err;
116 done:
117 	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
118 		err = got_error_from_errno("close");
119 	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
120 		err = got_error_from_errno("close");
121 	if (fd != -1 && close(fd) == -1 && err == NULL)
122 		err = got_error_from_errno2("close", gotconfig_path);
123 	if (err) {
124 		got_gotconfig_free(*conf);
125 		*conf = NULL;
126 	}
127 	free(ibuf);
128 	return err;
129 }
130 
131 void
132 got_gotconfig_free(struct got_gotconfig *conf)
133 {
134 	int i;
135 
136 	if (conf == NULL)
137 		return;
138 
139 	free(conf->author);
140 
141 	for (i = 0; i < conf->nremotes; i++)
142 		got_repo_free_remote_repo_data(&conf->remotes[i]);
143 	free(conf->remotes);
144 	free(conf);
145 }
146 
147 const char *
148 got_gotconfig_get_author(const struct got_gotconfig *conf)
149 {
150 	return conf->author;
151 }
152 
153 void
154 got_gotconfig_get_remotes(int *nremotes, const struct got_remote_repo **remotes,
155     const struct got_gotconfig *conf)
156 {
157 	*nremotes = conf->nremotes;
158 	*remotes = conf->remotes;
159 }