1 /*
2  * Copyright (c) 2018, 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 "got_compat.h"
18 
19 #include <sys/queue.h>
20 
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <err.h>
25 #include <unistd.h>
26 #include <getopt.h>
27 
28 #include "got_error.h"
29 #include "got_opentemp.h"
30 #include "got_path.h"
31 
32 #include "got_lib_delta.h"
33 
34 #ifndef nitems
35 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
36 #endif
37 
38 const struct delta_test {
39 	const char *base;
40 	size_t base_len;
41 	const char *delta;
42 	size_t delta_len;
43 	const char *expected;
44 	size_t result_len;
45 } delta_tests[] = {
46 	/* base len 0, target len 4, append 4 'x' */
47 	{ "", 0, "\x00\x04\x04xxxx", 7, "xxxx", 4 },
48 	/* copy 4 bytes at offset 0 from base, append 4 'x' */
49 	{ "aabbccdd", 8, "\x08\x08\x90\x04\x04xxxx", 9, "aabbxxxx", 8 },
50 	/* copy 4 bytes at offset 4 from base, append 4 'x' */
51 	{ "aabbccdd", 8, "\x08\x08\x91\x04\x04\x04xxxx", 10, "ccddxxxx", 8 },
52 	/* git 48fb7deb5 Fix big left-shifts of unsigned char, 2009-06-17) */
53 	{ "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
54 	  16, "\x10\x10\xff\xff\xff\xff\xff\x10\00\00", 10 , NULL, 0 },
55 	/* libgit2 9844d38be delta: fix out-of-bounds read of delta */
56 	{ "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
57 	  16, "\x10\x70\xff", 3, NULL, 0}
58 };
59 
60 static int
61 delta_apply(void)
62 {
63 	const struct got_error *err = NULL;
64 	size_t i;
65 	FILE *result_file;
66 
67 	result_file = got_opentemp();
68 	if (result_file == NULL)
69 		return 1;
70 
71 	for (i = 0; i < nitems(delta_tests); i++) {
72 		const struct delta_test *dt = &delta_tests[i];
73 		FILE *base_file;
74 		char buf[1024];
75 		size_t n, result_len;
76 
77 		base_file = got_opentemp();
78 		if (base_file == NULL) {
79 			err = got_error_from_errno("got_opentemp");
80 			break;
81 		}
82 
83 		n = fwrite(dt->base, 1, dt->base_len, base_file);
84 		if (n != dt->base_len) {
85 			err = got_ferror(base_file, GOT_ERR_IO);
86 			break;
87 		}
88 		rewind(base_file);
89 
90 		err = got_delta_apply(base_file, dt->delta, dt->delta_len,
91 		    result_file, &result_len);
92 		if (fclose(base_file) == EOF && err == NULL)
93 			err = got_error_from_errno("fclose");
94 		if (dt->expected == NULL) {
95 			/* Invalid delta, expect an error. */
96 			if (err == NULL)
97 				err = got_error(GOT_ERR_EXPECTED);
98 			else if (err->code == GOT_ERR_BAD_DELTA)
99 				err = NULL;
100 		} else {
101 			if (err)
102 				break;
103 			if (result_len != dt->result_len) {
104 				err = got_ferror(result_file,
105 				    GOT_ERR_BAD_DELTA);
106 				break;
107 			}
108 			n = fread(buf, result_len, 1, result_file);
109 			if (n != 1 ||
110 			    strncmp(buf, dt->expected, result_len) != 0) {
111 				err = got_ferror(result_file,
112 				    GOT_ERR_BAD_DELTA);
113 				break;
114 			}
115 		}
116 		rewind(result_file);
117 	}
118 
119 	fclose(result_file);
120 	return (err == NULL);
121 }
122 
123 static int quiet;
124 
125 #define RUN_TEST(expr, name) \
126 	{ test_ok = (expr);  \
127 	if (!quiet) printf("test_%s %s\n", (name), test_ok ? "ok" : "failed"); \
128 	failure = (failure || !test_ok); }
129 
130 static void
131 usage(void)
132 {
133 	fprintf(stderr, "usage: delta_test [-q]\n");
134 }
135 
136 int
137 main(int argc, char *argv[])
138 {
139 	int test_ok;
140 	int failure = 0;
141 	int ch;
142 
143 	while ((ch = getopt(argc, argv, "q")) != -1) {
144 		switch (ch) {
145 		case 'q':
146 			quiet = 1;
147 			break;
148 		default:
149 			usage();
150 			return 1;
151 		}
152 	}
153 
154 	argc -= optind;
155 	argv += optind;
156 
157 	if (argc != 0) {
158 		usage();
159 		return 1;
160 	}
161 
162 #ifndef PROFILE
163 	if (pledge("stdio rpath wpath cpath unveil", NULL) == -1)
164 		err(1, "pledge");
165 #endif
166 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
167 		err(1, "unveil");
168 
169 	if (unveil(NULL, NULL) != 0)
170 		err(1, "unveil");
171 
172 	RUN_TEST(delta_apply(), "delta_apply");
173 
174 	return failure ? 1 : 0;
175 }