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/*
* Copyright (C) Roman Arutyunyan
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#define NGX_PROXY_PROTOCOL_AF_INET 1
#define NGX_PROXY_PROTOCOL_AF_INET6 2
#define ngx_proxy_protocol_parse_uint16(p) ((p)[0] << 8 | (p)[1])
typedef struct {
u_char signature[12];
u_char version_command;
u_char family_transport;
u_char len[2];
} ngx_proxy_protocol_header_t;
typedef struct {
u_char src_addr[4];
u_char dst_addr[4];
u_char src_port[2];
u_char dst_port[2];
} ngx_proxy_protocol_inet_addrs_t;
typedef struct {
u_char src_addr[16];
u_char dst_addr[16];
u_char src_port[2];
u_char dst_port[2];
} ngx_proxy_protocol_inet6_addrs_t;
static u_char *ngx_proxy_protocol_v2_read(ngx_connection_t *c, u_char *buf,
u_char *last);
u_char *
ngx_proxy_protocol_read(ngx_connection_t *c, u_char *buf, u_char *last)
{
size_t len;
u_char ch, *p, *addr, *port;
ngx_int_t n;
static const u_char signature[] = "\r\n\r\n\0\r\nQUIT\n";
p = buf;
len = last - buf;
if (len >= sizeof(ngx_proxy_protocol_header_t)
&& memcmp(p, signature, sizeof(signature) - 1) == 0)
{
return ngx_proxy_protocol_v2_read(c, buf, last);
}
if (len < 8 || ngx_strncmp(p, "PROXY ", 6) != 0) {
goto invalid;
}
p += 6;
len -= 6;
if (len >= 7 && ngx_strncmp(p, "UNKNOWN", 7) == 0) {
ngx_log_debug0(NGX_LOG_DEBUG_CORE, c->log, 0,
"PROXY protocol unknown protocol");
p += 7;
goto skip;
}
if (len < 5 || ngx_strncmp(p, "TCP", 3) != 0
|| (p[3] != '4' && p[3] != '6') || p[4] != ' ')
{
goto invalid;
}
p += 5;
addr = p;
for ( ;; ) {
if (p == last) {
goto invalid;
}
ch = *p++;
if (ch == ' ') {
break;
}
if (ch != ':' && ch != '.'
&& (ch < 'a' || ch > 'f')
&& (ch < 'A' || ch > 'F')
&& (ch < '0' || ch > '9'))
{
goto invalid;
}
}
len = p - addr - 1;
c->proxy_protocol_addr.data = ngx_pnalloc(c->pool, len);
if (c->proxy_protocol_addr.data == NULL) {
return NULL;
}
ngx_memcpy(c->proxy_protocol_addr.data, addr, len);
c->proxy_protocol_addr.len = len;
for ( ;; ) {
if (p == last) {
goto invalid;
}
if (*p++ == ' ') {
break;
}
}
port = p;
for ( ;; ) {
if (p == last) {
goto invalid;
}
if (*p++ == ' ') {
break;
}
}
len = p - port - 1;
n = ngx_atoi(port, len);
if (n < 0 || n > 65535) {
goto invalid;
}
c->proxy_protocol_port = (in_port_t) n;
ngx_log_debug2(NGX_LOG_DEBUG_CORE, c->log, 0,
"PROXY protocol address: %V %d", &c->proxy_protocol_addr,
c->proxy_protocol_port);
skip:
for ( /* void */ ; p < last - 1; p++) {
if (p[0] == CR && p[1] == LF) {
return p + 2;
}
}
invalid:
ngx_log_error(NGX_LOG_ERR, c->log, 0,
"broken header: \"%*s\"", (size_t) (last - buf), buf);
return NULL;
}
u_char *
ngx_proxy_protocol_write(ngx_connection_t *c, u_char *buf, u_char *last)
{
ngx_uint_t port, lport;
if (last - buf < NGX_PROXY_PROTOCOL_MAX_HEADER) {
return NULL;
}
if (ngx_connection_local_sockaddr(c, NULL, 0) != NGX_OK) {
return NULL;
}
switch (c->sockaddr->sa_family) {
case AF_INET:
buf = ngx_cpymem(buf, "PROXY TCP4 ", sizeof("PROXY TCP4 ") - 1);
break;
#if (NGX_HAVE_INET6)
case AF_INET6:
buf = ngx_cpymem(buf, "PROXY TCP6 ", sizeof("PROXY TCP6 ") - 1);
break;
#endif
default:
return ngx_cpymem(buf, "PROXY UNKNOWN" CRLF,
sizeof("PROXY UNKNOWN" CRLF) - 1);
}
buf += ngx_sock_ntop(c->sockaddr, c->socklen, buf, last - buf, 0);
*buf++ = ' ';
buf += ngx_sock_ntop(c->local_sockaddr, c->local_socklen, buf, last - buf,
0);
port = ngx_inet_get_port(c->sockaddr);
lport = ngx_inet_get_port(c->local_sockaddr);
return ngx_slprintf(buf, last, " %ui %ui" CRLF, port, lport);
}
static u_char *
ngx_proxy_protocol_v2_read(ngx_connection_t *c, u_char *buf, u_char *last)
{
u_char *end;
size_t len;
socklen_t socklen;
ngx_uint_t version, command, family, transport;
ngx_sockaddr_t sockaddr;
ngx_proxy_protocol_header_t *header;
ngx_proxy_protocol_inet_addrs_t *in;
#if (NGX_HAVE_INET6)
ngx_proxy_protocol_inet6_addrs_t *in6;
#endif
header = (ngx_proxy_protocol_header_t *) buf;
buf += sizeof(ngx_proxy_protocol_header_t);
version = header->version_command >> 4;
if (version != 2) {
ngx_log_error(NGX_LOG_ERR, c->log, 0,
"unknown PROXY protocol version: %ui", version);
return NULL;
}
len = ngx_proxy_protocol_parse_uint16(header->len);
if ((size_t) (last - buf) < len) {
ngx_log_error(NGX_LOG_ERR, c->log, 0, "header is too large");
return NULL;
}
end = buf + len;
command = header->version_command & 0x0f;
/* only PROXY is supported */
if (command != 1) {
ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
"PROXY protocol v2 unsupported command %ui", command);
return end;
}
transport = header->family_transport & 0x0f;
/* only STREAM is supported */
if (transport != 1) {
ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
"PROXY protocol v2 unsupported transport %ui",
transport);
return end;
}
family = header->family_transport >> 4;
switch (family) {
case NGX_PROXY_PROTOCOL_AF_INET:
if ((size_t) (end - buf) < sizeof(ngx_proxy_protocol_inet_addrs_t)) {
return NULL;
}
in = (ngx_proxy_protocol_inet_addrs_t *) buf;
sockaddr.sockaddr_in.sin_family = AF_INET;
sockaddr.sockaddr_in.sin_port = 0;
memcpy(&sockaddr.sockaddr_in.sin_addr, in->src_addr, 4);
c->proxy_protocol_port = ngx_proxy_protocol_parse_uint16(in->src_port);
socklen = sizeof(struct sockaddr_in);
buf += sizeof(ngx_proxy_protocol_inet_addrs_t);
break;
#if (NGX_HAVE_INET6)
case NGX_PROXY_PROTOCOL_AF_INET6:
if ((size_t) (end - buf) < sizeof(ngx_proxy_protocol_inet6_addrs_t)) {
return NULL;
}
in6 = (ngx_proxy_protocol_inet6_addrs_t *) buf;
sockaddr.sockaddr_in6.sin6_family = AF_INET6;
sockaddr.sockaddr_in6.sin6_port = 0;
memcpy(&sockaddr.sockaddr_in6.sin6_addr, in6->src_addr, 16);
c->proxy_protocol_port = ngx_proxy_protocol_parse_uint16(in6->src_port);
socklen = sizeof(struct sockaddr_in6);
buf += sizeof(ngx_proxy_protocol_inet6_addrs_t);
break;
#endif
default:
ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
"PROXY protocol v2 unsupported address family %ui",
family);
return end;
}
c->proxy_protocol_addr.data = ngx_pnalloc(c->pool, NGX_SOCKADDR_STRLEN);
if (c->proxy_protocol_addr.data == NULL) {
return NULL;
}
c->proxy_protocol_addr.len = ngx_sock_ntop(&sockaddr.sockaddr, socklen,
c->proxy_protocol_addr.data,
NGX_SOCKADDR_STRLEN, 0);
ngx_log_debug2(NGX_LOG_DEBUG_CORE, c->log, 0,
"PROXY protocol v2 address: %V %d", &c->proxy_protocol_addr,
c->proxy_protocol_port);
if (buf < end) {
ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
"PROXY protocol v2 %z bytes of tlv ignored", end - buf);
}
return end;
}
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