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_commit_data(uint8_t **p, size_t *len, struct got_object *obj, FILE *f)
43 {
44 	const struct got_error *err;
45 
46 	if (obj->flags & GOT_OBJ_FLAG_PACKED)
47 		err = got_read_file_to_mem(p, len, f);
48 	else
49 		err = got_inflate_to_mem(p, len, f);
50 	if (err)
51 		return err;
52 
53 	if (*len < obj->hdrlen + obj->size) {
54 		free(*p);
55 		*p = NULL;
56 		*len = 0;
57 		return got_error(GOT_ERR_BAD_OBJ_DATA);
58 	}
59 
60 	/* Skip object header. */
61 	*len -= obj->hdrlen;
62 	return NULL;
63 }
64 
65 static const struct got_error *
66 read_commit_object(struct got_commit_object **commit, struct got_object *obj,
67     FILE *f)
68 {
69 	const struct got_error *err;
70 	uint8_t *p;
71 	size_t len;
72 
73 	err = read_commit_data(&p, &len, obj, f);
74 	if (err)
75 		return err;
76 
77 	err = got_object_parse_commit(commit, p + obj->hdrlen, len);
78 	free(p);
79 	return err;
80 }
81 
82 static const struct got_error *
83 read_commit_object_mini(struct got_mini_commit_object **commit,
84     struct got_object *obj, FILE *f)
85 {
86 	const struct got_error *err;
87 	size_t len;
88 	uint8_t *p;
89 
90 	err = read_commit_data(&p, &len, obj, f);
91 	if (err)
92 		return err;
93 
94 	err = got_object_parse_mini_commit(commit, p + obj->hdrlen, len);
95 	free(p);
96 	return err;
97 }
98 
99 int
100 main(int argc, char *argv[])
101 {
102 	const struct got_error *err = NULL;
103 	struct imsgbuf ibuf;
104 	size_t datalen;
105 
106 	imsg_init(&ibuf, GOT_IMSG_FD_CHILD);
107 
108 #ifndef PROFILE
109 	/* revoke access to most system calls */
110 	if (pledge("stdio recvfd", NULL) == -1) {
111 		err = got_error_from_errno();
112 		got_privsep_send_error(&ibuf, err);
113 		return 1;
114 	}
115 #endif
116 
117 	while (1) {
118 		struct imsg imsg;
119 		struct got_imsg_object iobj;
120 		FILE *f = NULL;
121 		struct got_object *obj = NULL;
122 		int mini = 0;
123 	
124 		err = got_privsep_recv_imsg(&imsg, &ibuf, 0);
125 		if (err) {
126 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
127 				err = NULL;
128 			break;
129 		}
130 
131 		if (imsg.hdr.type == GOT_IMSG_STOP)
132 			break;
133 
134 		switch (imsg.hdr.type) {
135 			case GOT_IMSG_COMMIT_REQUEST:
136 				mini = 0;
137 				break;
138 			case GOT_IMSG_MINI_COMMIT_REQUEST:
139 				mini = 1;
140 				break;
141 			default:
142 				err = got_error(GOT_ERR_PRIVSEP_MSG);
143 				goto done;
144 		}
145 
146 		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
147 		if (datalen != sizeof(iobj)) {
148 			err = got_error(GOT_ERR_PRIVSEP_LEN);
149 			goto done;
150 		}
151 
152 		memcpy(&iobj, imsg.data, sizeof(iobj));
153 		if (iobj.type != GOT_OBJ_TYPE_COMMIT) {
154 			err = got_error(GOT_ERR_OBJ_TYPE);
155 			goto done;
156 		}
157 
158 		if (imsg.fd == -1) {
159 			err = got_error(GOT_ERR_PRIVSEP_NO_FD);
160 			goto done;
161 		}
162 
163 		obj = calloc(1, sizeof(*obj));
164 		if (obj == NULL) {
165 			err = got_error_from_errno();
166 			goto done;
167 		}
168 		obj->type = iobj.type;
169 		obj->hdrlen = iobj.hdrlen;
170 		obj->size = iobj.size;
171 
172 		/* Always assume file offset zero. */
173 		f = fdopen(imsg.fd, "rb");
174 		if (f == NULL) {
175 			err = got_error_from_errno();
176 			goto done;
177 		}
178 
179 		if (mini) {
180 			struct got_mini_commit_object *commit;
181 			err = read_commit_object_mini(&commit, obj, f);
182 			if (err)
183 				goto done;
184 			err = got_privsep_send_mini_commit(&ibuf, commit);
185 			got_object_mini_commit_close(commit);
186 		} else {
187 			struct got_commit_object *commit;
188 			err = read_commit_object(&commit, obj, f);
189 			if (err)
190 				goto done;
191 			err = got_privsep_send_commit(&ibuf, commit);
192 			got_object_commit_close(commit);
193 		}
194 done:
195 		if (f)
196 			fclose(f);
197 		else if (imsg.fd != -1)
198 			close(imsg.fd);
199 		imsg_free(&imsg);
200 		if (obj)
201 			got_object_close(obj);
202 		if (err) {
203 			if (err->code == GOT_ERR_PRIVSEP_PIPE)
204 				err = NULL;
205 			else
206 				got_privsep_send_error(&ibuf, err);
207 			break;
208 		}
209 	}
210 
211 	imsg_clear(&ibuf);
212 	if (err)
213 		fprintf(stderr, "%s: %s\n", getprogname(), err->msg);
214 	close(GOT_IMSG_FD_CHILD);
215 	return err ? 1 : 0;
216 }