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/*
* convert from text form of SA ID to binary
* Copyright (C) 2000, 2001 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 <sys/socket.h>
#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 },
{ "int", 3, SA_INT },
{ NULL, 0, 0, }
};
static struct magic {
char *name;
char *really;
} magic[] = {
{ PASSTHROUGHNAME, PASSTHROUGH4IS },
{ PASSTHROUGH4NAME, PASSTHROUGH4IS },
{ PASSTHROUGH6NAME, PASSTHROUGH6IS },
{ "%pass", "int256@0.0.0.0" },
{ "%drop", "int257@0.0.0.0" },
{ "%reject", "int258@0.0.0.0" },
{ "%hold", "int259@0.0.0.0" },
{ "%trap", "int260@0.0.0.0" },
{ "%trapsubnet", "int261@0.0.0.0" },
{ NULL, NULL }
};
/*
- ttosa - convert text "ah507@10.0.0.1" to SA identifier
*/
err_t /* NULL for success, else string literal */
ttosa(src, srclen, sa)
const char *src;
size_t srclen; /* 0 means "apply strlen" */
ip_said *sa;
{
const char *at;
const char *addr;
size_t alen;
const char *spi = NULL;
struct satype *sat;
unsigned long ul;
const char *oops;
struct magic *mp;
size_t nlen;
# define MINLEN 5 /* ah0@0 is as short as it can get */
int af;
int base;
if (srclen == 0)
srclen = strlen(src);
if (srclen == 0)
return "empty string";
if (srclen < MINLEN)
return "string too short to be SA identifier";
if (*src == '%') {
for (mp = magic; mp->name != NULL; mp++) {
nlen = strlen(mp->name);
if (srclen == nlen && memcmp(src, mp->name, nlen) == 0)
break;
}
if (mp->name == NULL)
return "unknown % keyword";
src = mp->really;
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";
switch (*spi) {
case '.':
af = AF_INET;
spi++;
base = 16;
break;
case ':':
af = AF_INET6;
spi++;
base = 16;
break;
default:
af = AF_UNSPEC; /* not known yet */
base = 0;
break;
}
if (spi >= at)
return "no SPI found in SA specifier";
oops = ttoul(spi, at - spi, base, &ul);
if (oops != NULL)
return oops;
sa->spi = htonl(ul);
addr = at + 1;
alen = srclen - (addr - src);
if (af == AF_UNSPEC)
af = (memchr(addr, ':', alen) != NULL) ? AF_INET6 : AF_INET;
oops = ttoaddr(addr, alen, af, &sa->dst);
if (oops != NULL)
return oops;
return NULL;
}
#ifdef TTOSA_MAIN
#include <stdio.h>
void regress(void);
int
main(int argc, char *argv[])
{
ip_said sa;
char buf[100];
char buf2[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 = ttosa(argv[1], 0, &sa);
if (oops != NULL) {
fprintf(stderr, "%s: conversion failed: %s\n", argv[0], oops);
exit(1);
}
n = satot(&sa, 0, buf, sizeof(buf));
if (n > sizeof(buf)) {
fprintf(stderr, "%s: reverse conv of `%d'", argv[0], sa.proto);
fprintf(stderr, "%lx@", (long unsigned int)sa.spi);
(void) addrtot(&sa.dst, 0, buf2, sizeof(buf2));
fprintf(stderr, "%s", buf2);
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 {
int format;
# define FUDGE 0x1000
char *input;
char *output; /* NULL means error expected */
} rtab[] = {
{0, "esp257@1.2.3.0", "esp.101@1.2.3.0"},
{0, "ah0x20@1.2.3.4", "ah.20@1.2.3.4"},
{0, "tun20@1.2.3.4", "tun.14@1.2.3.4"},
{0, "comp20@1.2.3.4", "comp.14@1.2.3.4"},
{0, "esp257@::1", "esp:101@::1"},
{0, "esp257@0bc:12de::1", "esp:101@bc:12de::1"},
{0, "esp78@1049:1::8007:2040", "esp:4e@1049:1::8007:2040"},
{0, "esp0x78@1049:1::8007:2040", "esp:78@1049:1::8007:2040"},
{0, "ah78@1049:1::8007:2040", "ah:4e@1049:1::8007:2040"},
{0, "ah0x78@1049:1::8007:2040", "ah:78@1049:1::8007:2040"},
{0, "tun78@1049:1::8007:2040", "tun:4e@1049:1::8007:2040"},
{0, "tun0x78@1049:1::8007:2040", "tun:78@1049:1::8007:2040"},
{0, "duk99@3ffe:370:400:ff::9001:3001", NULL},
{0, "esp78x@1049:1::8007:2040", NULL},
{0, "esp0x78@1049:1:0xfff::8007:2040", NULL},
{0, "es78@1049:1::8007:2040", NULL},
{0, "", NULL},
{0, "_", NULL},
{0, "ah2.2", NULL},
{0, "goo2@1.2.3.4", NULL},
{0, "esp9@1.2.3.4", "esp.9@1.2.3.4"},
{'f', "esp0xa9@1.2.3.4", "esp.000000a9@1.2.3.4"},
{0, "espp9@1.2.3.4", NULL},
{0, "es9@1.2.3.4", NULL},
{0, "ah@1.2.3.4", NULL},
{0, "esp7x7@1.2.3.4", NULL},
{0, "esp77@1.0x2.3.4", NULL},
{0, PASSTHROUGHNAME, PASSTHROUGH4NAME},
{0, PASSTHROUGH6NAME, PASSTHROUGH6NAME},
{0, "%pass", "%pass"},
{0, "int256@0.0.0.0", "%pass"},
{0, "%drop", "%drop"},
{0, "int257@0.0.0.0", "%drop"},
{0, "%reject", "%reject"},
{0, "int258@0.0.0.0", "%reject"},
{0, "%hold", "%hold"},
{0, "int259@0.0.0.0", "%hold"},
{0, "%trap", "%trap"},
{0, "int260@0.0.0.0", "%trap"},
{0, "%trapsubnet", "%trapsubnet"},
{0, "int261@0.0.0.0", "%trapsubnet"},
{0, "int262@0.0.0.0", "int.106@0.0.0.0"},
{FUDGE, "esp9@1.2.3.4", "unk77.9@1.2.3.4"},
{0, NULL, NULL}
};
void
regress(void)
{
struct rtab *r;
int status = 0;
ip_said 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 = ttosa(in, 0, &sa);
if (oops != NULL && r->output == NULL)
{} /* okay, error expected */
else if (oops != NULL) {
printf("`%s' ttosa failed: %s\n", r->input, oops);
status = 1;
} else if (r->output == NULL) {
printf("`%s' ttosa succeeded unexpectedly\n",
r->input);
status = 1;
} else {
if (r->format&FUDGE)
sa.proto = 77;
n = satot(&sa, (char)r->format, buf, sizeof(buf));
if (n > sizeof(buf)) {
printf("`%s' satot 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 /* TTOSA_MAIN */
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