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/syslimits.h>
22 
23 #include <stdint.h>
24 #include <imsg.h>
25 #include <limits.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 #ifndef nitems
43 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
44 #endif
45 
46 #define GOT_OBJ_TAG_COMMIT	"commit"
47 #define GOT_OBJ_TAG_TREE	"tree"
48 #define GOT_OBJ_TAG_BLOB	"blob"
49 #define GOT_OBJ_TAG_TAG		"tag"
50 
51 static volatile sig_atomic_t sigint_received;
52 
53 static void
54 catch_sigint(int signo)
55 {
56 	sigint_received = 1;
57 }
58 
59 int
60 main(int argc, char *argv[])
61 {
62 	const struct got_error *err = NULL;
63 	struct got_object *obj = NULL;
64 	struct imsg imsg;
65 	struct imsgbuf ibuf;
66 	size_t datalen;
67 
68 	signal(SIGINT, catch_sigint);
69 
70 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
71 
72 #ifndef PROFILE
73 	/* revoke access to most system calls */
74 	if (pledge("stdio recvfd", NULL) == -1) {
75 		err = got_error_from_errno("pledge");
76 		got_privsep_send_error(&ibuf, err);
77 		return 1;
78 	}
79 #endif
80 
81 	for (;;) {
82 		if (sigint_received) {
83 			err = got_error(GOT_ERR_CANCELLED);
84 			break;
85 		}
86 
87 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
88 		if (err) {
89 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
90 				err = NULL;
91 			break;
92 		}
93 
94 		if (imsg.hdr.type == GOT_IMSG_STOP)
95 			break;
96 
97 		if (imsg.hdr.type != GOT_IMSG_OBJECT_REQUEST) {
98 			err = got_error(GOT_ERR_PRIVSEP_MSG);
99 			goto done;
100 		}
101 
102 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
103 		if (datalen != 0) {
104 			err = got_error(GOT_ERR_PRIVSEP_LEN);
105 			goto done;
106 		}
107 
108 		err = got_object_read_header(&obj, imsg.fd);
109 		if (err)
110 			goto done;
111 
112 		err = got_privsep_send_obj(&ibuf, obj);
113 done:
114 		if (close(imsg.fd) != 0 && err == NULL)
115 			err = got_error_from_errno("close");
116 		imsg_free(&imsg);
117 		if (obj)
118 			got_object_close(obj);
119 		if (err)
120 			break;
121 	}
122 
123 	imsg_clear(&ibuf);
124 	if (err) {
125 		if(!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
126 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
127 			got_privsep_send_error(&ibuf, err);
128 		}
129 	}
130 	if (close(GOT_IMSG_FD_CHILD) != 0 && err == NULL)
131 		err = got_error_from_errno("close");
132 	return err ? 1 : 0;
133 }