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