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 int
42 main(int argc, char *argv[])
43 {
44 	const struct got_error *err = NULL;
45 	struct imsgbuf ibuf;
46 	size_t datalen;
47 
48 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
49 
50 #ifndef PROFILE
51 	/* revoke access to most system calls */
52 	if (pledge("stdio recvfd", NULL) == -1) {
53 		err = got_error_from_errno();
54 		got_privsep_send_error(&ibuf, err);
55 		return 1;
56 	}
57 #endif
58 
59 	while (1) {
60 		struct imsg imsg, imsg_outfd;
61 		FILE *f = NULL;
62 		size_t size;
63 	
64 		memset(&imsg, 0, sizeof(imsg));
65 		imsg.fd = -1;
66 		memset(&imsg_outfd, 0, sizeof(imsg_outfd));
67 		imsg_outfd.fd = -1;
68 
69 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
70 		if (err) {
71 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
72 				err = NULL;
73 			break;
74 		}
75 
76 		if (imsg.hdr.type == GOT_IMSG_STOP)
77 			break;
78 
79 		if (imsg.hdr.type != GOT_IMSG_BLOB_REQUEST) {
80 			err = got_error(GOT_ERR_PRIVSEP_MSG);
81 			goto done;
82 		}
83 
84 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
85 		if (datalen != 0) {
86 			err = got_error(GOT_ERR_PRIVSEP_LEN);
87 			goto done;
88 		}
89 		if (imsg.fd == -1) {
90 			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
91 			goto done;
92 		}
93 
94 		err = got_privsep_recv_imsg(&imsg_outfd, &ibuf, 0);
95 		if (err) {
96 			if (imsg.hdr.len == 0)
97 				err = NULL;
98 			break;
99 		}
100 
101 		if (imsg_outfd.hdr.type == GOT_IMSG_STOP)
102 			break;
103 
104 		if (imsg_outfd.hdr.type != GOT_IMSG_BLOB_OUTFD) {
105 			err = got_error(GOT_ERR_PRIVSEP_MSG);
106 			goto done;
107 		}
108 
109 		datalen = imsg_outfd.hdr.len - IMSG_HEADER_SIZE;
110 		if (datalen != 0) {
111 			err = got_error(GOT_ERR_PRIVSEP_LEN);
112 			goto done;
113 		}
114 		if (imsg_outfd.fd == -1) {
115 			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
116 			goto done;
117 		}
118 
119 		f = fdopen(imsg.fd, "rb");
120 		if (f == NULL) {
121 			err = got_error_from_errno();
122 			goto done;
123 		}
124 
125 		err = got_inflate_to_fd(&size, f, imsg_outfd.fd);
126 		if (err)
127 			goto done;
128 
129 		err = got_privsep_send_blob(&ibuf, size);
130 done:
131 		if (f)
132 			fclose(f);
133 		else if (imsg.fd != -1)
134 			close(imsg.fd);
135 		if (imsg_outfd.fd != -1)
136 			close(imsg_outfd.fd);
137 		imsg_free(&imsg);
138 		imsg_free(&imsg_outfd);
139 		if (err) {
140 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
141 				err = NULL;
142 			else
143 				got_privsep_send_error(&ibuf, err);
144 			break;
145 		}
146 	}
147 
148 	imsg_clear(&ibuf);
149 	if (err)
150 		fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
151 	close(GOT_IMSG_FD_CHILD);
152 	return err ? 1 : 0;
153 }