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