summaryrefslogtreecommitdiff
path: root/src/libfreeswan/atosa.c
blob: 7339b4c3e87064c556cc3a92ec0b8ac56b8c3f6d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
/*
 * convert from ASCII form of SA ID to binary
 * Copyright (C) 1998, 1999  Henry Spencer.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/lgpl.txt>.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
 * License for more details.
 */
#include "internal.h"
#include "freeswan.h"

static struct satype {
	char *prefix;
	size_t prelen;		/* strlen(prefix) */
	int proto;
} satypes[] = {
	{ "ah",		2,	SA_AH	},
	{ "esp",	3,	SA_ESP	},
	{ "tun",	3,	SA_IPIP },
	{ "comp",	4,	SA_COMP },
	{ NULL,		0,	0,	}
};

/*
 - atosa - convert ASCII "ah507@10.0.0.1" to SA identifier
 */
const char *			/* NULL for success, else string literal */
atosa(src, srclen, sa)
const char *src;
size_t srclen;			/* 0 means "apply strlen" */
struct sa_id *sa;
{
	const char *at;
	const char *addr;
	const char *spi = NULL;
	struct satype *sat;
	unsigned long ul;
	const char *oops;
#	define	MINLEN	5	/* ah0@0 is as short as it can get */
	static char ptname[] = PASSTHROUGHNAME;
#	define	PTNLEN	(sizeof(ptname)-1)	/* -1 for NUL */

	if (srclen == 0)
		srclen = strlen(src);
	if (srclen == 0)
		return "empty string";
	if (srclen < MINLEN)
		return "string too short to be SA specifier";
	if (srclen == PTNLEN && memcmp(src, ptname, PTNLEN) == 0) {
		src = PASSTHROUGHIS;
		srclen = strlen(src);
	}

	at = memchr(src, '@', srclen);
	if (at == NULL)
		return "no @ in SA specifier";

	for (sat = satypes; sat->prefix != NULL; sat++)
		if (sat->prelen < srclen &&
				strncmp(src, sat->prefix, sat->prelen) == 0) {
			sa->proto = sat->proto;
			spi = src + sat->prelen;
			break;			/* NOTE BREAK OUT */
		}
	if (sat->prefix == NULL)
		return "SA specifier lacks valid protocol prefix";

	if (spi >= at)
		return "no SPI in SA specifier";
	oops = atoul(spi, at - spi, 13, &ul);
	if (oops != NULL)
		return oops;
	sa->spi = htonl(ul);

	addr = at + 1;
	oops = atoaddr(addr, srclen - (addr - src), &sa->dst);
	if (oops != NULL)
		return oops;

	return NULL;
}



#ifdef ATOSA_MAIN

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

void regress(void);

int
main(int argc, char *argv[])
{
	struct sa_id sa;
	char buf[100];
	const char *oops;
	size_t n;

	if (argc < 2) {
		fprintf(stderr, "Usage: %s {ahnnn@aaa|-r}\n", argv[0]);
		exit(2);
	}

	if (strcmp(argv[1], "-r") == 0) {
		regress();
		fprintf(stderr, "regress() returned?!?\n");
		exit(1);
	}

	oops = atosa(argv[1], 0, &sa);
	if (oops != NULL) {
		fprintf(stderr, "%s: conversion failed: %s\n", argv[0], oops);
		exit(1);
	}
	n = satoa(sa, 0, buf, sizeof(buf));
	if (n > sizeof(buf)) {
		fprintf(stderr, "%s: reverse conv of `%d'", argv[0], sa.proto);
		fprintf(stderr, "%lu@", (long unsigned int)sa.spi);
		fprintf(stderr, "%s", inet_ntoa(sa.dst));
		fprintf(stderr, " failed: need %ld bytes, have only %ld\n",
						(long)n, (long)sizeof(buf));
		exit(1);
	}
	printf("%s\n", buf);

	exit(0);
}

struct rtab {
	char *input;
	char *output;			/* NULL means error expected */
} rtab[] = {
	{"esp257@1.2.3.0",		"esp257@1.2.3.0"},
	{"ah0x20@1.2.3.4",		"ah32@1.2.3.4"},
	{"tun011@111.2.3.99",		"tun11@111.2.3.99"},
	{"",				NULL},
	{"_",				NULL},
	{"ah2.2",			NULL},
	{"goo2@1.2.3.4",			NULL},
	{"esp9@1.2.3.4",			"esp9@1.2.3.4"},
	{"espp9@1.2.3.4",		NULL},
	{"es9@1.2.3.4",			NULL},
	{"ah@1.2.3.4",			NULL},
	{"esp7x7@1.2.3.4",		NULL},
	{"esp77@1.0x2.3.4",		NULL},
	{PASSTHROUGHNAME,		PASSTHROUGHNAME},
        {NULL,				NULL}
};

void
regress(void)
{
	struct rtab *r;
	int status = 0;
	struct sa_id sa;
	char in[100];
	char buf[100];
	const char *oops;
	size_t n;

	for (r = rtab; r->input != NULL; r++) {
		strcpy(in, r->input);
		oops = atosa(in, 0, &sa);
		if (oops != NULL && r->output == NULL)
			{}		/* okay, error expected */
		else if (oops != NULL) {
			printf("`%s' atosa failed: %s\n", r->input, oops);
			status = 1;
		} else if (r->output == NULL) {
			printf("`%s' atosa succeeded unexpectedly\n",
								r->input);
			status = 1;
		} else {
			n = satoa(sa, 'd', buf, sizeof(buf));
			if (n > sizeof(buf)) {
				printf("`%s' satoa failed:  need %ld\n",
							r->input, (long)n);
				status = 1;
			} else if (strcmp(r->output, buf) != 0) {
				printf("`%s' gave `%s', expected `%s'\n",
						r->input, buf, r->output);
				status = 1;
			}
		}
	}
	exit(status);
}

#endif /* ATOSA_MAIN */