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/*
* Copyright (C) Roman Arutyunyan
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
u_char *
ngx_proxy_protocol_read(ngx_connection_t *c, u_char *buf, u_char *last)
{
size_t len;
u_char ch, *p, *addr;
p = buf;
len = last - buf;
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;
ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
"PROXY protocol address: \"%V\"", &c->proxy_protocol_addr);
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);
port = ntohs(((struct sockaddr_in *) c->sockaddr)->sin_port);
lport = ntohs(((struct sockaddr_in *) c->local_sockaddr)->sin_port);
break;
#if (NGX_HAVE_INET6)
case AF_INET6:
buf = ngx_cpymem(buf, "PROXY TCP6 ", sizeof("PROXY TCP6 ") - 1);
port = ntohs(((struct sockaddr_in6 *) c->sockaddr)->sin6_port);
lport = ntohs(((struct sockaddr_in6 *) c->local_sockaddr)->sin6_port);
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);
return ngx_slprintf(buf, last, " %ui %ui" CRLF, port, lport);
}
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