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