1 /*
2  * Copyright (c) 2019 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_object.h"
38 #include "got_lib_privsep.h"
39 #include "got_lib_gitconfig.h"
40 
41 static volatile sig_atomic_t sigint_received;
42 
43 static void
44 catch_sigint(int signo)
45 {
46 	sigint_received = 1;
47 }
48 
49 static const struct got_error *
50 gitconfig_num_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
51     char *section, char *tag, int def)
52 {
53 	int value;
54 
55 	if (gitconfig == NULL)
56 		return got_error(GOT_ERR_PRIVSEP_MSG);
57 
58 	value = got_gitconfig_get_num(gitconfig, section, tag, def);
59 	return got_privsep_send_gitconfig_int(ibuf, value);
60 }
61 
62 static const struct got_error *
63 gitconfig_str_request(struct imsgbuf *ibuf, struct got_gitconfig *gitconfig,
64     char *section, char *tag)
65 {
66 	char *value;
67 
68 	if (gitconfig == NULL)
69 		return got_error(GOT_ERR_PRIVSEP_MSG);
70 
71 	value = got_gitconfig_get_str(gitconfig, section, tag);
72 	return got_privsep_send_gitconfig_str(ibuf, value);
73 }
74 
75 int
76 main(int argc, char *argv[])
77 {
78 	const struct got_error *err = NULL;
79 	struct imsgbuf ibuf;
80 	size_t datalen;
81 	struct got_gitconfig *gitconfig = NULL;
82 #if 0
83 	static int attached;
84 
85 	while (!attached)
86 		sleep(1);
87 #endif
88 	signal(SIGINT, catch_sigint);
89 
90 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
91 
92 #ifndef PROFILE
93 	/* revoke access to most system calls */
94 	if (pledge("stdio recvfd", NULL) == -1) {
95 		err = got_error_from_errno("pledge");
96 		got_privsep_send_error(&ibuf, err);
97 		return 1;
98 	}
99 #endif
100 
101 	for (;;) {
102 		struct imsg imsg;
103 
104 		memset(&imsg, 0, sizeof(imsg));
105 		imsg.fd = -1;
106 
107 		if (sigint_received) {
108 			err = got_error(GOT_ERR_CANCELLED);
109 			break;
110 		}
111 
112 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
113 		if (err) {
114 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
115 				err = NULL;
116 			break;
117 		}
118 
119 		if (imsg.hdr.type == GOT_IMSG_STOP)
120 			break;
121 
122 		switch (imsg.hdr.type) {
123 		case GOT_IMSG_GITCONFIG_PARSE_REQUEST:
124 			datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
125 			if (datalen != 0) {
126 				err = got_error(GOT_ERR_PRIVSEP_LEN);
127 				break;
128 			}
129 			if (imsg.fd == -1){
130 				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
131 				break;
132 			}
133 
134 			if (gitconfig)
135 				got_gitconfig_close(gitconfig);
136 			err = got_gitconfig_open(&gitconfig, imsg.fd);
137 			break;
138 		case GOT_IMSG_GITCONFIG_REPOSITORY_FORMAT_VERSION_REQUEST:
139 			err = gitconfig_num_request(&ibuf, gitconfig, "core",
140 			    "repositoryformatversion", 0);
141 			break;
142 		case GOT_IMSG_GITCONFIG_AUTHOR_NAME_REQUEST:
143 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
144 			    "name");
145 			break;
146 		case GOT_IMSG_GITCONFIG_AUTHOR_EMAIL_REQUEST:
147 			err = gitconfig_str_request(&ibuf, gitconfig, "user",
148 			    "email");
149 			break;
150 		default:
151 			err = got_error(GOT_ERR_PRIVSEP_MSG);
152 			break;
153 		}
154 
155 		if (imsg.fd != -1) {
156 			if (close(imsg.fd) == -1 && err == NULL)
157 				err = got_error_from_errno("close");
158 		}
159 
160 		imsg_free(&imsg);
161 		if (err)
162 			break;
163 	}
164 
165 	imsg_clear(&ibuf);
166 	if (err) {
167 		if (!sigint_received && err->code != GOT_ERR_PRIVSEP_PIPE) {
168 			fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
169 			got_privsep_send_error(&ibuf, err);
170 		}
171 	}
172 	if (close(GOT_IMSG_FD_CHILD) != 0 && err == NULL)
173 		err = got_error_from_errno("close");
174 	return err ? 1 : 0;
175 }