1 /*
2  * Copyright (c) 2018 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 #include <sys/limits.h>
22 #include <sys/syslimits.h>
23 
24 #include <stdint.h>
25 #include <imsg.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sha1.h>
31 #include <zlib.h>
32 
33 #include "got_error.h"
34 #include "got_object.h"
35 
36 #include "got_lib_delta.h"
37 #include "got_lib_inflate.h"
38 #include "got_lib_object.h"
39 #include "got_lib_object_parse.h"
40 #include "got_lib_privsep.h"
41 
42 static volatile sig_atomic_t sigint_received;
43 
44 static void
45 catch_sigint(int signo)
46 {
47 	sigint_received = 1;
48 }
49 
50 static const struct got_error *
51 read_commit_object(struct got_commit_object **commit, FILE *f)
52 {
53 	struct got_object *obj;
54 	const struct got_error *err = NULL;
55 	size_t len;
56 	uint8_t *p;
57 
58 	err = got_inflate_to_mem(&p, &len, f);
59 	if (err)
60 		return err;
61 
62 	err = got_object_parse_header(&obj, p, len);
63 	if (err)
64 		return err;
65 
66 	if (len < obj->hdrlen + obj->size) {
67 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
68 		goto done;
69 	}
70 
71 	if (obj->type != GOT_OBJ_TYPE_COMMIT) {
72 		err = got_error(GOT_ERR_OBJ_TYPE);
73 		goto done;
74 	}
75 
76 	/* Skip object header. */
77 	len -= obj->hdrlen;
78 	err = got_object_parse_commit(commit, p + obj->hdrlen, len);
79 done:
80 	free(p);
81 	got_object_close(obj);
82 	return err;
83 }
84 
85 int
86 main(int argc, char *argv[])
87 {
88 	const struct got_error *err = NULL;
89 	struct imsgbuf ibuf;
90 
91 	signal(SIGINT, catch_sigint);
92 
93 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
94 
95 #ifndef PROFILE
96 	/* revoke access to most system calls */
97 	if (pledge("stdio recvfd", NULL) == -1) {
98 		err = got_error_from_errno("pledge");
99 		got_privsep_send_error(&ibuf, err);
100 		return 1;
101 	}
102 #endif
103 
104 	for (;;) {
105 		struct imsg imsg;
106 		FILE *f = NULL;
107 		struct got_commit_object *commit = NULL;
108 
109 		if (sigint_received) {
110 			err = got_error(GOT_ERR_CANCELLED);
111 			break;
112 		}
113 
114 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
115 		if (err) {
116 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
117 				err = NULL;
118 			break;
119 		}
120 
121 		if (imsg.hdr.type == GOT_IMSG_STOP)
122 			break;
123 
124 		if (imsg.hdr.type != GOT_IMSG_COMMIT_REQUEST) {
125 			err = got_error(GOT_ERR_PRIVSEP_MSG);
126 			goto done;
127 		}
128 
129 		if (imsg.fd == -1) {
130 			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
131 			goto done;
132 		}
133 
134 		/* Always assume file offset zero. */
135 		f = fdopen(imsg.fd, "rb");
136 		if (f == NULL) {
137 			err = got_error_from_errno("fdopen");
138 			goto done;
139 		}
140 
141 		err = read_commit_object(&commit, f);
142 		if (err)
143 			goto done;
144 
145 		err = got_privsep_send_commit(&ibuf, commit);
146 done:
147 		if (f) {
148 			if (fclose(f) != 0 && err == NULL)
149 				err = got_error_from_errno("fclose");
150 		} else if (imsg.fd != -1) {
151 			if (close(imsg.fd) != 0 && err == NULL)
152 				err = got_error_from_errno("close");
153 		}
154 		imsg_free(&imsg);
155 		if (err)
156 			break;
157 	}
158 
159 	imsg_clear(&ibuf);
160 	if (err) {
161 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
162 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
163 			got_privsep_send_error(&ibuf, err);
164 		}
165 	}
166 	if (close(GOT_IMSG_FD_CHILD) != 0 && err == NULL)
167 		err = got_error_from_errno("close");
168 	return err ? 1 : 0;
169 }