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 <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <unistd.h>
30 
31 #include "got_error.h"
32 #include "got_serve.h"
33 
34 #include "gotd.h"
35 
36 static int chattygot;
37 
38 __dead static void
39 usage()
40 {
41 	fprintf(stderr, "usage: %s -c '%s|%s repository-path'\n",
42 	    getprogname(), GOT_SERVE_CMD_SEND, GOT_SERVE_CMD_FETCH);
43 	exit(1);
44 }
45 
46 static const struct got_error *
47 apply_unveil(const char *unix_socket_path)
48 {
49 #ifdef PROFILE
50 	if (unveil("gmon.out", "rwc") != 0)
51 		return got_error_from_errno2("unveil", "gmon.out");
52 #endif
53 	if (unveil(unix_socket_path, "w") != 0)
54 		return got_error_from_errno2("unveil", unix_socket_path);
55 
56 	if (unveil(NULL, NULL) != 0)
57 		return got_error_from_errno("unveil");
58 
59 	return NULL;
60 }
61 
62 int
63 main(int argc, char *argv[])
64 {
65 	const struct got_error *error;
66 	const char *unix_socket_path;
67 	int gotd_sock = -1;
68 	struct sockaddr_un	 sun;
69 	char *gitcmd = NULL, *command = NULL, *repo_path = NULL;
70 
71 #ifndef PROFILE
72 	if (pledge("stdio recvfd unix unveil", NULL) == -1)
73 		err(1, "pledge");
74 #endif
75 	if (strcmp(argv[0], GOT_SERVE_CMD_SEND) == 0 ||
76 	    strcmp(argv[0], GOT_SERVE_CMD_FETCH) == 0) {
77 		if (argc != 2)
78 			usage();
79 		if (asprintf(&gitcmd, "%s %s", argv[0], argv[1]) == -1)
80 			err(1, "asprintf");
81 		error = got_serve_parse_command(&command, &repo_path, gitcmd);
82 	} else {
83 		if (argc != 3 || strcmp(argv[1], "-c") != 0)
84 			usage();
85 		error = got_serve_parse_command(&command, &repo_path, argv[2]);
86 	}
87 	if (error && error->code == GOT_ERR_BAD_PACKET)
88 		usage();
89 	if (error)
90 		goto done;
91 
92 	unix_socket_path = getenv("GOTD_UNIX_SOCKET");
93 	if (unix_socket_path == NULL)
94 		unix_socket_path = GOTD_UNIX_SOCKET;
95 
96 	error = apply_unveil(unix_socket_path);
97 	if (error)
98 		goto done;
99 
100 #ifndef PROFILE
101 	if (pledge("stdio recvfd unix", NULL) == -1)
102 		err(1, "pledge");
103 #endif
104 	if ((gotd_sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
105 		err(1, "socket");
106 
107 	memset(&sun, 0, sizeof(sun));
108 	sun.sun_family = AF_UNIX;
109 	if (strlcpy(sun.sun_path, unix_socket_path,
110 	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path))
111 		errx(1, "gotd socket path too long");
112 	if (connect(gotd_sock, (struct sockaddr *)&sun, sizeof(sun)) == -1)
113 		err(1, "connect: %s", unix_socket_path);
114 
115 #ifndef PROFILE
116 	if (pledge("stdio recvfd", NULL) == -1)
117 		err(1, "pledge");
118 #endif
119 	error = got_serve(STDIN_FILENO, STDOUT_FILENO, command, repo_path,
120 	    gotd_sock, chattygot);
121 done:
122 	free(gitcmd);
123 	free(command);
124 	free(repo_path);
125 	if (gotd_sock != -1)
126 		close(gotd_sock);
127 	if (error) {
128 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
129 		return 1;
130 	}
131 
132 	return 0;
133 }