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/*
* 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.
*
* RCSID $Id: atosa.c,v 1.1 2004/03/15 20:35:26 as Exp $
*/
#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 */
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