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/*
* Copyright (c) 2024 github.com/Sir-Photch <sir-photch@posteo.me>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "gmid.h"
#include <stdint.h>
#include <string.h>
#include "log.h"
#define MIN(a, b) (a) < (b) ? (a) : (b)
static int
check_prefix_v1(char **buf)
{
static const char PROXY[6] = "PROXY ";
if (strncmp(*buf, PROXY, sizeof(PROXY)) != 0)
return (-1);
*buf += sizeof(PROXY);
return (0);
}
static int
check_proto_v1(char **buf)
{
static const char TCP[3] = "TCP";
if (strncmp(*buf, TCP, sizeof(TCP)) != 0)
return (-1);
*buf += sizeof(TCP);
int type;
switch ((*buf)[0]) {
case '4': type = 4; break;
case '6': type = 6; break;
default: return (-1);
}
if ((*buf)[1] != ' ')
return (-1);
// '4' / '6' + ' '
*buf += 2;
return type;
}
static int
check_unknown_v1(char **buf)
{
static const char UNKNOWN[7] = "UNKNOWN";
if (strncmp(*buf, UNKNOWN, sizeof(UNKNOWN)) != 0)
return (-1);
*buf += sizeof(UNKNOWN);
return (0);
}
static int
check_crlf_v1(char *const *buf, size_t buflen)
{
static const char CRLF[2] = "\r\n";
if (buflen < sizeof(CRLF))
return (-1);
if (!memmem(*buf, buflen, CRLF, sizeof(CRLF)))
return (-1);
return (0);
}
static int
check_ip_v1(int af, char **buf, struct sockaddr_storage *addr, socklen_t *len)
{
struct addrinfo hints, *res;
char *spc;
int err;
if ((spc = strchr(*buf, ' ')) == NULL)
return (-1);
*spc++ = '\0';
memset(&hints, 0, sizeof(hints));
hints.ai_family = af;
hints.ai_flags = AI_NUMERICHOST;
err = getaddrinfo(*buf, NULL, &hints, &res);
if (err) {
log_warnx("getaddrinfo(%s): %s", *buf, gai_strerror(err));
return (-1);
}
memcpy(addr, res->ai_addr, res->ai_addrlen);
*len = res->ai_addrlen;
freeaddrinfo(res);
*buf = spc;
return (0);
}
static int
check_port_v1(uint16_t *port, char **buf)
{
size_t wspc_idx = strcspn(*buf, " \r");
char *wspc = *buf + wspc_idx;
if (!(*wspc == ' ' || *wspc == '\r'))
return (-1);
*wspc++ = '\0';
const char *errstr;
long long num = strtonum(*buf, 0, UINT16_MAX, &errstr);
if (errstr)
return (-1);
*buf = wspc;
*port = num;
return (0);
}
int
proxy_proto_v1_parse(struct proxy_protocol_v1 *s, char *buf, size_t buflen,
size_t *consumed)
{
const char *begin = buf;
int af;
if (check_crlf_v1(&buf, buflen) == -1 ||
check_prefix_v1(&buf) == -1)
return (-1);
switch (check_proto_v1(&buf)) {
case 4: s->proto = PROTO_V4; break;
case 6: s->proto = PROTO_V6; break;
case -1:
if (check_unknown_v1(&buf) == -1)
return (-1);
s->proto = PROTO_UNKNOWN;
return (0);
default:
return (-1);
}
af = AF_INET;
if (s->proto == PROTO_V6)
af = AF_INET6;
if (check_ip_v1(af, &buf, &s->srcaddr, &s->srclen) == -1 ||
check_ip_v1(AF_UNSPEC, &buf, &s->dstaddr, &s->dstlen) == -1 ||
check_port_v1(&s->srcport, &buf) == -1 ||
check_port_v1(&s->dstport, &buf) == -1)
return (-1);
if (*buf != '\n')
return (-1);
buf += 1;
*consumed = buf - begin;
return (0);
}
int
proxy_proto_v1_string(const struct proxy_protocol_v1 *s, char *buf,
size_t buflen)
{
char srcaddr[NI_MAXHOST], dstaddr[NI_MAXHOST];
int ret;
if (s->proto == PROTO_UNKNOWN)
return strlcpy(buf, "unknown", buflen);
ret = getnameinfo((struct sockaddr *)&s->srcaddr, s->srclen,
srcaddr, sizeof(srcaddr), NULL, 0,
NI_NUMERICHOST);
if (ret) {
log_warnx("getnameinfo: %s", gai_strerror(ret));
return (-1);
}
ret = getnameinfo((struct sockaddr *)&s->dstaddr, s->dstlen,
dstaddr, sizeof(dstaddr), NULL, 0,
NI_NUMERICHOST);
if (ret) {
log_warnx("getnameinfo: %s", gai_strerror(ret));
return (-1);
}
ret = snprintf(buf, buflen, "from %s port %u via %s port %u",
srcaddr, s->srcport, dstaddr, s->dstport);
if (ret < 0 || (size_t)ret >= buflen)
return (-1);
return (ret);
}
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