1 /*
2  * Copyright (c) 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/queue.h>
18 #include <sys/socket.h>
19 #include <sys/un.h>
20 
21 #include <err.h>
22 #include <event.h>
23 #include <imsg.h>
24 #include <limits.h>
25 #include <sha1.h>
26 #include <sha2.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 
32 #include "got_error.h"
33 #include "got_serve.h"
34 #include "got_path.h"
35 
36 #include "gotd.h"
37 
38 static int chattygot;
39 
40 __dead static void
41 usage(void)
42 {
43 	fprintf(stderr, "usage: %s -c '%s|%s repository-path'\n",
44 	    getprogname(), GOT_SERVE_CMD_SEND, GOT_SERVE_CMD_FETCH);
45 	exit(1);
46 }
47 
48 static const struct got_error *
49 apply_unveil(const char *unix_socket_path)
50 {
51 #ifdef PROFILE
52 	if (unveil("gmon.out", "rwc") != 0)
53 		return got_error_from_errno2("unveil", "gmon.out");
54 #endif
55 	if (unveil(unix_socket_path, "w") != 0)
56 		return got_error_from_errno2("unveil", unix_socket_path);
57 
58 	if (unveil(NULL, NULL) != 0)
59 		return got_error_from_errno("unveil");
60 
61 	return NULL;
62 }
63 
64 int
65 main(int argc, char *argv[])
66 {
67 	const struct got_error *error;
68 	const char *unix_socket_path;
69 	int gotd_sock = -1;
70 	struct sockaddr_un	 sun;
71 	char *gitcmd = NULL, *command = NULL, *repo_path = NULL;
72 
73 #ifndef PROFILE
74 	if (pledge("stdio recvfd unix unveil", NULL) == -1)
75 		err(1, "pledge");
76 #endif
77 
78 	unix_socket_path = getenv("GOTD_UNIX_SOCKET");
79 	if (unix_socket_path == NULL)
80 		unix_socket_path = GOTD_UNIX_SOCKET;
81 
82 	error = apply_unveil(unix_socket_path);
83 	if (error)
84 		goto done;
85 
86 	if (strcmp(argv[0], GOT_SERVE_CMD_SEND) == 0 ||
87 	    strcmp(argv[0], GOT_SERVE_CMD_FETCH) == 0) {
88 		if (argc != 2)
89 			usage();
90 		if (asprintf(&gitcmd, "%s %s", argv[0], argv[1]) == -1)
91 			err(1, "asprintf");
92 		error = got_serve_parse_command(&command, &repo_path, gitcmd);
93 	} else {
94 		if (argc != 3 || strcmp(argv[1], "-c") != 0)
95 			usage();
96 		error = got_serve_parse_command(&command, &repo_path, argv[2]);
97 	}
98 	if (error && error->code == GOT_ERR_BAD_PACKET)
99 		usage();
100 	if (error)
101 		goto done;
102 
103 	if ((gotd_sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
104 		err(1, "socket");
105 
106 	memset(&sun, 0, sizeof(sun));
107 	sun.sun_family = AF_UNIX;
108 	if (strlcpy(sun.sun_path, unix_socket_path,
109 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path))
110 		errx(1, "gotd socket path too long");
111 	if (connect(gotd_sock, (struct sockaddr *)&sun, sizeof(sun)) == -1)
112 		err(1, "connect: %s", unix_socket_path);
113 
114 #ifndef PROFILE
115 	if (pledge("stdio recvfd", NULL) == -1)
116 		err(1, "pledge");
117 #endif
118 	error = got_serve(STDIN_FILENO, STDOUT_FILENO, command, repo_path,
119 	    gotd_sock, chattygot);
120 done:
121 	free(gitcmd);
122 	free(command);
123 	free(repo_path);
124 	if (gotd_sock != -1)
125 		close(gotd_sock);
126 	if (error) {
127 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
128 		return 1;
129 	}
130 
131 	return 0;
132 }