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 <unistd.h>
31 #include <zlib.h>
32 
33 #include "got_error.h"
34 #include "got_object.h"
35 #include "got_path.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_privsep.h"
42 
43 static volatile sig_atomic_t sigint_received;
44 
45 static void
46 catch_sigint(int signo)
47 {
48 	sigint_received = 1;
49 }
50 
51 static const struct got_error *
52 read_tree_object(struct got_pathlist_head *entries, int *nentries,
53     uint8_t **p, FILE *f)
54 {
55 	const struct got_error *err = NULL;
56 	struct got_object *obj;
57 	size_t len;
58 
59 	err = got_inflate_to_mem(p, &len, NULL, f);
60 	if (err)
61 		return err;
62 
63 	err = got_object_parse_header(&obj, *p, len);
64 	if (err)
65 		return err;
66 
67 	if (len < obj->hdrlen + obj->size) {
68 		err = got_error(GOT_ERR_BAD_OBJ_DATA);
69 		goto done;
70 	}
71 
72 	/* Skip object header. */
73 	len -= obj->hdrlen;
74 	err = got_object_parse_tree(entries, nentries, *p + obj->hdrlen, len);
75 done:
76 	got_object_close(obj);
77 	return err;
78 }
79 
80 int
81 main(int argc, char *argv[])
82 {
83 	const struct got_error *err = NULL;
84 	struct imsgbuf ibuf;
85 
86 	signal(SIGINT, catch_sigint);
87 
88 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
89 
90 #ifndef PROFILE
91 	/* revoke access to most system calls */
92 	if (pledge("stdio recvfd", NULL) == -1) {
93 		err = got_error_from_errno("pledge");
94 		got_privsep_send_error(&ibuf, err);
95 		return 1;
96 	}
97 #endif
98 
99 	for (;;) {
100 		struct imsg imsg;
101 		FILE *f = NULL;
102 		struct got_pathlist_head entries;
103 		int nentries = 0;
104 		uint8_t *buf = NULL;
105 
106 		TAILQ_INIT(&entries);
107 
108 		if (sigint_received) {
109 			err = got_error(GOT_ERR_CANCELLED);
110 			break;
111 		}
112 
113 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
114 		if (err) {
115 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
116 				err = NULL;
117 			break;
118 		}
119 
120 		if (imsg.hdr.type == GOT_IMSG_STOP)
121 			break;
122 
123 		if (imsg.hdr.type != GOT_IMSG_TREE_REQUEST) {
124 			err = got_error(GOT_ERR_PRIVSEP_MSG);
125 			goto done;
126 		}
127 
128 		if (imsg.fd == -1) {
129 			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
130 			goto done;
131 		}
132 
133 		/* Always assume file offset zero. */
134 		f = fdopen(imsg.fd, "rb");
135 		if (f == NULL) {
136 			err = got_error_from_errno("fdopen");
137 			goto done;
138 		}
139 
140 		err = read_tree_object(&entries, &nentries, &buf, f);
141 		if (err)
142 			goto done;
143 
144 		err = got_privsep_send_tree(&ibuf, &entries, nentries);
145 done:
146 		got_object_parsed_tree_entries_free(&entries);
147 		free(buf);
148 		if (f) {
149 			if (fclose(f) == EOF && err == NULL)
150 				err = got_error_from_errno("fclose");
151 		} else if (imsg.fd != -1) {
152 			if (close(imsg.fd) == -1 && err == NULL)
153 				err = got_error_from_errno("close");
154 		}
155 		imsg_free(&imsg);
156 		if (err)
157 			break;
158 	}
159 
160 	imsg_clear(&ibuf);
161 	if (err) {
162 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
163 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
164 			got_privsep_send_error(&ibuf, err);
165 		}
166 	}
167 	if (close(GOT_IMSG_FD_CHILD) == -1 && err == NULL)
168 		err = got_error_from_errno("close");
169 	return err ? 1 : 0;
170 }