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