1 /*
2  * Copyright (c) 2018, 2019, 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/time.h>
21 
22 #include <stdint.h>
23 #include <imsg.h>
24 #include <limits.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <sha1.h>
30 #include <sha2.h>
31 #include <unistd.h>
32 #include <zlib.h>
33 
34 #include "got_error.h"
35 #include "got_object.h"
36 
37 #include "got_lib_delta.h"
38 #include "got_lib_inflate.h"
39 #include "got_lib_object.h"
40 #include "got_lib_object_parse.h"
41 #include "got_lib_object_qid.h"
42 #include "got_lib_privsep.h"
43 #include "got_lib_hash.h"
44 
45 static volatile sig_atomic_t sigint_received;
46 
47 static void
48 catch_sigint(int signo)
49 {
50 	sigint_received = 1;
51 }
52 
53 int
54 main(int argc, char *argv[])
55 {
56 	const struct got_error *err = NULL;
57 	struct imsgbuf ibuf;
58 	size_t datalen;
59 
60 	signal(SIGINT, catch_sigint);
61 
62 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
63 
64 #ifndef PROFILE
65 	/* revoke access to most system calls */
66 	if (pledge("stdio recvfd", NULL) == -1) {
67 		err = got_error_from_errno("pledge");
68 		got_privsep_send_error(&ibuf, err);
69 		return 1;
70 	}
71 #endif
72 
73 	for (;;) {
74 		struct imsg imsg;
75 		struct got_commit_object *commit = NULL;
76 		struct got_object_id expected_id;
77 
78 		if (sigint_received) {
79 			err = got_error(GOT_ERR_CANCELLED);
80 			break;
81 		}
82 
83 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
84 		if (err) {
85 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
86 				err = NULL;
87 			break;
88 		}
89 
90 		if (imsg.hdr.type == GOT_IMSG_STOP)
91 			break;
92 
93 		if (imsg.hdr.type != GOT_IMSG_COMMIT_REQUEST) {
94 			err = got_error(GOT_ERR_PRIVSEP_MSG);
95 			goto done;
96 		}
97 
98 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
99 		if (datalen != sizeof(expected_id)) {
100 			err = got_error(GOT_ERR_PRIVSEP_LEN);
101 			goto done;
102 		}
103 		memcpy(&expected_id, imsg.data, sizeof(expected_id));
104 
105 		if (imsg.fd == -1) {
106 			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
107 			goto done;
108 		}
109 
110 		err = got_object_read_commit(&commit, imsg.fd, &expected_id, 0);
111 		if (err)
112 			goto done;
113 
114 		err = got_privsep_send_commit(&ibuf, commit);
115 		got_object_commit_close(commit);
116 done:
117 		if (imsg.fd != -1 && close(imsg.fd) == -1 && err == NULL)
118 			err = got_error_from_errno("close");
119 		imsg_free(&imsg);
120 		if (err)
121 			break;
122 	}
123 
124 	imsg_clear(&ibuf);
125 	if (err) {
126 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
127 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
128 			got_privsep_send_error(&ibuf, err);
129 		}
130 	}
131 	if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
132 		err = got_error_from_errno("close");
133 	return err ? 1 : 0;
134 }