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