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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 <https://www.gnu.org/licenses/lgpl-2.1.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 <string.h>
#include <stdio.h>
#include "passert.h"
#include "ip_said.h"
#include "ip_info.h"
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" },
{ "%ignore", "int261@0.0.0.0" },
{ NULL, NULL }
};
/*
* ttosaid - convert text "ah507@10.0.0.1" to SA identifier
*
* NULL for success, else string literal
*/
diag_t ttosaid(shunk_t src, ip_said *said)
{
*said = unset_said;
err_t oops;
if (src.len == 0) {
return diag("empty string");
}
# define MINLEN strlen("ah0@0"/*is as short as it can get */)
if (src.len < MINLEN) {
return diag("string too short to be SA identifier");
}
/*
* Try to turn %... into its equivalent.
*/
shunk_t input;
if (hunk_char(src, 0) == '%') {
struct magic *mp;
for (mp = magic; mp->name != NULL; mp++) {
if (hunk_streq(src, mp->name)) {
break;
}
}
if (mp->name == NULL) {
return diag("keyword "PRI_SHUNK" unknown", pri_shunk(src));
}
/* now parse the real string */
input = shunk1(mp->really);
} else {
input = src;
}
const struct ip_protocol *protocol = protocol_from_caseeat_prefix(&input);
if (protocol == NULL) {
return diag("SA specifier "PRI_SHUNK" lacks valid protocol prefix", pri_shunk(src));
}
if (input.len == 0) {
return diag("no SPI in SA specifier "PRI_SHUNK, pri_shunk(src));
}
unsigned base;
const struct ip_info *afi;
if (hunk_strcaseeat(&input, ".")) {
afi = &ipv4_info;
base = 16;
} else if (hunk_strcaseeat(&input, ":")) {
afi = &ipv6_info;
base = 16;
} else {
afi = NULL; /* not known yet */
base = 0;
}
if (input.len == 0) {
return diag("no SPI following protocol in SA specifier "PRI_SHUNK, pri_shunk(src));
}
uintmax_t hspi;
shunk_t spis = input;
oops = shunk_to_uintmax(input, &input, base, &hspi);
if (oops != NULL) {
return diag("SPI "PRI_SHUNK" invalid: %s", pri_shunk(spis), oops);
}
if (!hunk_strcaseeat(&input, "@")) {
return diag("missing @ in SA specifier");
}
ip_address dst;
shunk_t dsts = input;
oops = ttoaddress_num(input, afi, &dst);
if (oops != NULL) {
return diag("address "PRI_SHUNK" invalid: %s", pri_shunk(dsts), oops);
}
*said = said_from_address_protocol_spi(dst, protocol, htonl(hspi));
return NULL;
}
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