src/core/ngx_inet.c - net/nginx-mbedtls - Rivoreo Source Code Repositories


 /*
  * Copyright (C) Igor Sysoev
  */


 #include <ngx_config.h>
 #include <ngx_core.h>


 /*
  * ngx_sock_ntop() and ngx_inet_ntop() may be implemented as
  * "ngx_sprintf(text, "%ud.%ud.%ud.%ud", p[0], p[1], p[2], p[3])", however,
  * they had been implemented long before the ngx_sprintf() had appeared
  * and they are faster by 1.5-2.5 times, so it is worth to keep them.
  *
  * By the way, the implementation using ngx_sprintf() is faster by 2.5-3 times
  * than using FreeBSD libc's snprintf().
  */


 static ngx_inline size_t
 ngx_sprint_uchar(u_char *text, u_char c, size_t len)
 {
     size_t      n;
     ngx_uint_t  c1, c2;

     n = 0;

     if (len == n) {
         return n;
     }

     c1 = c / 100;

     if (c1) {
         *text++ = (u_char) (c1 + '0');
         n++;

         if (len == n) {
             return n;
         }
     }

     c2 = (c % 100) / 10;

     if (c1 || c2) {
         *text++ = (u_char) (c2 + '0');
         n++;

         if (len == n) {
             return n;
         }
     }

     c2 = c % 10;

     *text++ = (u_char) (c2 + '0');
     n++;

     return n;
 }


 /* AF_INET only */

 size_t
 ngx_sock_ntop(int family, struct sockaddr *sa, u_char *text, size_t len)
 {
     u_char              *p;
     size_t               n;
     ngx_uint_t           i;
     struct sockaddr_in  *sin;

     if (len == 0) {
         return 0;
     }

     if (family != AF_INET) {
         return 0;
     }

     sin = (struct sockaddr_in *) sa;
     p = (u_char *) &sin->sin_addr;

     if (len > INET_ADDRSTRLEN) {
         len = INET_ADDRSTRLEN;
     }

     n = ngx_sprint_uchar(text, p[0], len);

     i = 1;

     do {
         if (len == n) {
             text[n - 1] = '\0';
             return n;
         }

         text[n++] = '.';

         if (len == n) {
             text[n - 1] = '\0';
             return n;
         }

         n += ngx_sprint_uchar(&text[n], p[i++], len - n);

     } while (i < 4);

     if (len == n) {
         text[n] = '\0';
         return n;
     }

     text[n] = '\0';

     return n;
 }

 size_t
 ngx_inet_ntop(int family, void *addr, u_char *text, size_t len)
 {
     u_char      *p;
     size_t       n;
     ngx_uint_t   i;

     if (len == 0) {
         return 0;
     }

     if (family != AF_INET) {
         return 0;
     }

     p = (u_char *) addr;

     if (len > INET_ADDRSTRLEN) {
         len = INET_ADDRSTRLEN;
     }

     n = ngx_sprint_uchar(text, p[0], len);

     i = 1;

     do {
         if (len == n) {
             text[n - 1] = '\0';
             return n;
         }

         text[n++] = '.';

         if (len == n) {
             text[n - 1] = '\0';
             return n;
         }

         n += ngx_sprint_uchar(&text[n], p[i++], len - n);

     } while (i < 4);

     if (len == n) {
         text[n] = '\0';
         return n;
     }

     text[n] = '\0';

     return n;
 }


 /* AF_INET only */

 ngx_int_t
 ngx_ptocidr(ngx_str_t *text, void *cidr)
 {
     ngx_int_t         m;
     ngx_uint_t        i;
     ngx_inet_cidr_t  *in_cidr;

     in_cidr = cidr;

     for (i = 0; i < text->len; i++) {
         if (text->data[i] == '/') {
             break;
         }
     }

     if (i == text->len) {
         return NGX_ERROR;
     }

     text->data[i] = '\0';
     in_cidr->addr = inet_addr((char *) text->data);
     text->data[i] = '/';
     if (in_cidr->addr == INADDR_NONE) {
         return NGX_ERROR;
     }

     m = ngx_atoi(&text->data[i + 1], text->len - (i + 1));
     if (m == NGX_ERROR) {
         return NGX_ERROR;
     }

     if (m == 0) {

         /* the x86 compilers use the shl instruction that shifts by modulo 32 */

         in_cidr->mask = 0;
         return NGX_OK;
     }

     in_cidr->mask = htonl((ngx_uint_t) (0 - (1 << (32 - m))));

     return NGX_OK;
 }


 ngx_int_t
 ngx_parse_url(ngx_conf_t *cf, ngx_url_t *u)
 {
     u_char              *p, *host, *port_start;
     size_t               len, port_len;
     ngx_int_t            port;
     ngx_uint_t           i;
     struct hostent      *h;
 #if (NGX_HAVE_UNIX_DOMAIN)
     struct sockaddr_un  *saun;
 #endif

     len = u->url.len;
     p = u->url.data;

     if (ngx_strncasecmp(p, (u_char *) "unix:", 5) == 0) {

 #if (NGX_HAVE_UNIX_DOMAIN)

         p += 5;
         len -= 5;

         u->uri.len = len;
         u->uri.data = p;

         if (u->uri_part) {
             for (i = 0; i < len; i++) {

                 if (p[i] == ':') {
                     len = i;

                     u->uri.len -= len + 1;
                     u->uri.data += len + 1;

                     break;
                 }
             }
         }

         if (len == 0) {
             u->err = "no path in the unix domain socket";
             return NGX_ERROR;
         }

         if (len + 1 > sizeof(saun->sun_path)) {
             u->err = "too long path in the unix domain socket";
             return NGX_ERROR;
         }

         u->addrs = ngx_pcalloc(cf->pool, sizeof(ngx_peer_addr_t));
         if (u->addrs == NULL) {
             return NGX_ERROR;
         }

         saun = ngx_pcalloc(cf->pool, sizeof(struct sockaddr_un));
         if (saun == NULL) {
             return NGX_ERROR;
         }

         u->naddrs = 1;

         saun->sun_family = AF_UNIX;
         (void) ngx_cpystrn((u_char *) saun->sun_path, p, len + 1);

         u->addrs[0].sockaddr = (struct sockaddr *) saun;
         u->addrs[0].socklen = sizeof(struct sockaddr_un);
         u->addrs[0].name.len = len + 5;
         u->addrs[0].name.data = u->url.data;

         u->host.len = len;
         u->host.data = p;

         u->unix_socket = 1;

         return NGX_OK;

 #else
         u->err = "the unix domain sockets are not supported on this platform";

         return NGX_ERROR;

 #endif
     }

     if ((p[0] == ':' || p[0] == '/') && !u->listen) {
         u->err = "invalid host";
         return NGX_ERROR;
     }

     u->host.data = p;

     port_start = NULL;
     port_len = 0;

     for (i = 0; i < len; i++) {

         if (p[i] == ':') {
             port_start = &p[i + 1];
             u->host.len = i;

             if (!u->uri_part) {
                 port_len = len - (i + 1);
                 break;
             }
         }

         if (p[i] == '/') {
             u->uri.len = len - i;
             u->uri.data = &p[i];

             if (u->host.len == 0) {
                 u->host.len = i;
             }

             if (port_start == NULL) {
                 u->no_port = 1;
                 goto no_port;
             }

             port_len = &p[i] - port_start;

             if (port_len == 0) {
                 u->err = "invalid port";
                 return NGX_ERROR;
             }

             break;
         }
     }

     if (port_start) {

         if (port_len == 0) {
             port_len = &p[i] - port_start;

             if (port_len == 0) {
                 u->err = "invalid port";
                 return NGX_ERROR;
             }
         }

         port = ngx_atoi(port_start, port_len);

         if (port == NGX_ERROR || port < 1 || port > 65536) {
             u->err = "invalid port";
             return NGX_ERROR;
         }

     } else {
         port = ngx_atoi(p, len);

         if (port == NGX_ERROR) {
             u->host.len = len;
             u->no_port = 1;

             goto no_port;
         }

         u->wildcard = 1;
     }

     u->port = (in_port_t) port;

 no_port:

     if (u->listen) {

         if (u->port == 0) {
             if (u->default_port == 0) {
                 u->err = "no port";
                 return NGX_ERROR;
             }

             u->port = u->default_port;
         }

         if (u->host.len == 1 && u->host.data[0] == '*') {
             u->host.len = 0;
         }

         /* AF_INET only */

         if (u->host.len) {

            host = ngx_palloc(cf->temp_pool, u->host.len + 1);
            if (host == NULL) {
                return NGX_ERROR;
            }

            (void) ngx_cpystrn(host, u->host.data, u->host.len + 1);

             u->addr.in_addr = inet_addr((const char *) host);

             if (u->addr.in_addr == INADDR_NONE) {
                 h = gethostbyname((const char *) host);

                 if (h == NULL || h->h_addr_list[0] == NULL) {
                     u->err = "host not found";
                     return NGX_ERROR;
                 }

                 u->addr.in_addr = *(in_addr_t *) (h->h_addr_list[0]);
             }

         } else {
             u->addr.in_addr = INADDR_ANY;
         }

         return NGX_OK;
     }

     if (u->host.len == 0) {
         u->err = "no host";
         return NGX_ERROR;
     }

     if (u->no_resolve) {
         return NGX_OK;
     }

     if (u->no_port) {
         u->port = u->default_port;
     }

     if (u->port == 0) {
         u->err = "no port";
         return NGX_ERROR;
     }

     if (ngx_inet_resolve_host(cf, u) != NGX_OK) {
         return NGX_ERROR;
     }

     return NGX_OK;
 }


 ngx_int_t
 ngx_inet_resolve_host(ngx_conf_t *cf, ngx_url_t *u)
 {
     u_char              *p, *host;
     size_t               len;
     in_addr_t            in_addr;
     ngx_uint_t           i;
     struct hostent      *h;
     struct sockaddr_in  *sin;

     host = ngx_palloc(cf->temp_pool, u->host.len + 1);
     if (host == NULL) {
         return NGX_ERROR;
     }

     (void) ngx_cpystrn(host, u->host.data, u->host.len + 1);

     /* AF_INET only */

     in_addr = inet_addr((char *) host);

     if (in_addr == INADDR_NONE) {
         h = gethostbyname((char *) host);

         if (h == NULL || h->h_addr_list[0] == NULL) {
             u->err = "host not found";
             return NGX_ERROR;
         }

         if (u->one_addr == 0) {
             for (i = 0; h->h_addr_list[i] != NULL; i++) { /* void */ }

         } else {
             i = 1;
         }

         /* MP: ngx_shared_palloc() */

         u->addrs = ngx_pcalloc(cf->pool, i * sizeof(ngx_peer_addr_t));
         if (u->addrs == NULL) {
             return NGX_ERROR;
         }

         u->naddrs = i;

         for (i = 0; h->h_addr_list[i] != NULL; i++) {

             sin = ngx_pcalloc(cf->pool, sizeof(struct sockaddr_in));
             if (sin == NULL) {
                 return NGX_ERROR;
             }

             sin->sin_family = AF_INET;
             sin->sin_port = htons(u->port);
             sin->sin_addr.s_addr = *(in_addr_t *) (h->h_addr_list[i]);

             u->addrs[i].sockaddr = (struct sockaddr *) sin;
             u->addrs[i].socklen = sizeof(struct sockaddr_in);

             len = INET_ADDRSTRLEN - 1 + 1 + sizeof(":65536") - 1;

             p = ngx_palloc(cf->pool, len);
             if (p == NULL) {
                 return NGX_ERROR;
             }

             len = ngx_sock_ntop(AF_INET, (struct sockaddr *) sin, p, len);

             u->addrs[i].name.len = ngx_sprintf(&p[len], ":%d", u->port) - p;
             u->addrs[i].name.data = p;
         }

     } else {

         /* MP: ngx_shared_palloc() */

         u->addrs = ngx_pcalloc(cf->pool, sizeof(ngx_peer_addr_t));
         if (u->addrs == NULL) {
             return NGX_ERROR;
         }

         sin = ngx_pcalloc(cf->pool, sizeof(struct sockaddr_in));
         if (sin == NULL) {
             return NGX_ERROR;
         }

         u->naddrs = 1;

         sin->sin_family = AF_INET;
         sin->sin_port = htons(u->port);
         sin->sin_addr.s_addr = in_addr;

         u->addrs[0].sockaddr = (struct sockaddr *) sin;
         u->addrs[0].socklen = sizeof(struct sockaddr_in);

         p = ngx_palloc(cf->pool, u->host.len + sizeof(":65536") - 1);
         if (p == NULL) {
             return NGX_ERROR;
         }

         u->addrs[0].name.len = ngx_sprintf(p, "%V:%d", &u->host, u->port) - p;
         u->addrs[0].name.data = p;
     }

     return NGX_OK;
 }

	/*
	* Copyright (C) Igor Sysoev
	*/


	#include <ngx_config.h>
	#include <ngx_core.h>


	/*
	* ngx_sock_ntop() and ngx_inet_ntop() may be implemented as
	* "ngx_sprintf(text, "%ud.%ud.%ud.%ud", p[0], p[1], p[2], p[3])", however,
	* they had been implemented long before the ngx_sprintf() had appeared
	* and they are faster by 1.5-2.5 times, so it is worth to keep them.
	*
	* By the way, the implementation using ngx_sprintf() is faster by 2.5-3 times
	* than using FreeBSD libc's snprintf().
	*/


	static ngx_inline size_t
	ngx_sprint_uchar(u_char *text, u_char c, size_t len)
	{
	size_t n;
	ngx_uint_t c1, c2;

	n = 0;

	if (len == n) {
	return n;
	}

	c1 = c / 100;

	if (c1) {
	*text++ = (u_char) (c1 + '0');
	n++;

	if (len == n) {
	return n;
	}
	}

	c2 = (c % 100) / 10;

	if (c1 \|\| c2) {
	*text++ = (u_char) (c2 + '0');
	n++;

	if (len == n) {
	return n;
	}
	}

	c2 = c % 10;

	*text++ = (u_char) (c2 + '0');
	n++;

	return n;
	}


	/* AF_INET only */

	size_t
	ngx_sock_ntop(int family, struct sockaddr sa, u_char text, size_t len)
	{
	u_char *p;
	size_t n;
	ngx_uint_t i;
	struct sockaddr_in *sin;

	if (len == 0) {
	return 0;
	}

	if (family != AF_INET) {
	return 0;
	}

	sin = (struct sockaddr_in *) sa;
	p = (u_char *) &sin->sin_addr;

	if (len > INET_ADDRSTRLEN) {
	len = INET_ADDRSTRLEN;
	}

	n = ngx_sprint_uchar(text, p[0], len);

	i = 1;

	do {
	if (len == n) {
	text[n - 1] = '\0';
	return n;
	}

	text[n++] = '.';

	if (len == n) {
	text[n - 1] = '\0';
	return n;
	}

	n += ngx_sprint_uchar(&text[n], p[i++], len - n);

	} while (i < 4);

	if (len == n) {
	text[n] = '\0';
	return n;
	}

	text[n] = '\0';

	return n;
	}

	size_t
	ngx_inet_ntop(int family, void addr, u_char text, size_t len)
	{
	u_char *p;
	size_t n;
	ngx_uint_t i;

	if (len == 0) {
	return 0;
	}

	if (family != AF_INET) {
	return 0;
	}

	p = (u_char *) addr;

	if (len > INET_ADDRSTRLEN) {
	len = INET_ADDRSTRLEN;
	}

	n = ngx_sprint_uchar(text, p[0], len);

	i = 1;

	do {
	if (len == n) {
	text[n - 1] = '\0';
	return n;
	}

	text[n++] = '.';

	if (len == n) {
	text[n - 1] = '\0';
	return n;
	}

	n += ngx_sprint_uchar(&text[n], p[i++], len - n);

	} while (i < 4);

	if (len == n) {
	text[n] = '\0';
	return n;
	}

	text[n] = '\0';

	return n;
	}


	/* AF_INET only */

	ngx_int_t
	ngx_ptocidr(ngx_str_t text, void cidr)
	{
	ngx_int_t m;
	ngx_uint_t i;
	ngx_inet_cidr_t *in_cidr;

	in_cidr = cidr;

	for (i = 0; i < text->len; i++) {
	if (text->data[i] == '/') {
	break;
	}
	}

	if (i == text->len) {
	return NGX_ERROR;
	}

	text->data[i] = '\0';
	in_cidr->addr = inet_addr((char *) text->data);
	text->data[i] = '/';
	if (in_cidr->addr == INADDR_NONE) {
	return NGX_ERROR;
	}

	m = ngx_atoi(&text->data[i + 1], text->len - (i + 1));
	if (m == NGX_ERROR) {
	return NGX_ERROR;
	}

	if (m == 0) {

	/* the x86 compilers use the shl instruction that shifts by modulo 32 */

	in_cidr->mask = 0;
	return NGX_OK;
	}

	in_cidr->mask = htonl((ngx_uint_t) (0 - (1 << (32 - m))));

	return NGX_OK;
	}


	ngx_int_t
	ngx_parse_url(ngx_conf_t cf, ngx_url_t u)
	{
	u_char p, host, *port_start;
	size_t len, port_len;
	ngx_int_t port;
	ngx_uint_t i;
	struct hostent *h;
	#if (NGX_HAVE_UNIX_DOMAIN)
	struct sockaddr_un *saun;
	#endif

	len = u->url.len;
	p = u->url.data;

	if (ngx_strncasecmp(p, (u_char *) "unix:", 5) == 0) {

	#if (NGX_HAVE_UNIX_DOMAIN)

	p += 5;
	len -= 5;

	u->uri.len = len;
	u->uri.data = p;

	if (u->uri_part) {
	for (i = 0; i < len; i++) {

	if (p[i] == ':') {
	len = i;

	u->uri.len -= len + 1;
	u->uri.data += len + 1;

	break;
	}
	}
	}

	if (len == 0) {
	u->err = "no path in the unix domain socket";
	return NGX_ERROR;
	}

	if (len + 1 > sizeof(saun->sun_path)) {
	u->err = "too long path in the unix domain socket";
	return NGX_ERROR;
	}

	u->addrs = ngx_pcalloc(cf->pool, sizeof(ngx_peer_addr_t));
	if (u->addrs == NULL) {
	return NGX_ERROR;
	}

	saun = ngx_pcalloc(cf->pool, sizeof(struct sockaddr_un));
	if (saun == NULL) {
	return NGX_ERROR;
	}

	u->naddrs = 1;

	saun->sun_family = AF_UNIX;
	(void) ngx_cpystrn((u_char *) saun->sun_path, p, len + 1);

	u->addrs[0].sockaddr = (struct sockaddr *) saun;
	u->addrs[0].socklen = sizeof(struct sockaddr_un);
	u->addrs[0].name.len = len + 5;
	u->addrs[0].name.data = u->url.data;

	u->host.len = len;
	u->host.data = p;

	u->unix_socket = 1;

	return NGX_OK;

	#else
	u->err = "the unix domain sockets are not supported on this platform";

	return NGX_ERROR;

	#endif
	}

	if ((p[0] == ':' \|\| p[0] == '/') && !u->listen) {
	u->err = "invalid host";
	return NGX_ERROR;
	}

	u->host.data = p;

	port_start = NULL;
	port_len = 0;

	for (i = 0; i < len; i++) {

	if (p[i] == ':') {
	port_start = &p[i + 1];
	u->host.len = i;

	if (!u->uri_part) {
	port_len = len - (i + 1);
	break;
	}
	}

	if (p[i] == '/') {
	u->uri.len = len - i;
	u->uri.data = &p[i];

	if (u->host.len == 0) {
	u->host.len = i;
	}

	if (port_start == NULL) {
	u->no_port = 1;
	goto no_port;
	}

	port_len = &p[i] - port_start;

	if (port_len == 0) {
	u->err = "invalid port";
	return NGX_ERROR;
	}

	break;
	}
	}

	if (port_start) {

	if (port_len == 0) {
	port_len = &p[i] - port_start;

	if (port_len == 0) {
	u->err = "invalid port";
	return NGX_ERROR;
	}
	}

	port = ngx_atoi(port_start, port_len);

	if (port == NGX_ERROR \|\| port < 1 \|\| port > 65536) {
	u->err = "invalid port";
	return NGX_ERROR;
	}

	} else {
	port = ngx_atoi(p, len);

	if (port == NGX_ERROR) {
	u->host.len = len;
	u->no_port = 1;

	goto no_port;
	}

	u->wildcard = 1;
	}

	u->port = (in_port_t) port;

	no_port:

	if (u->listen) {

	if (u->port == 0) {
	if (u->default_port == 0) {
	u->err = "no port";
	return NGX_ERROR;
	}

	u->port = u->default_port;
	}

	if (u->host.len == 1 && u->host.data[0] == '*') {
	u->host.len = 0;
	}

	/* AF_INET only */

	if (u->host.len) {

	host = ngx_palloc(cf->temp_pool, u->host.len + 1);
	if (host == NULL) {
	return NGX_ERROR;
	}

	(void) ngx_cpystrn(host, u->host.data, u->host.len + 1);

	u->addr.in_addr = inet_addr((const char *) host);

	if (u->addr.in_addr == INADDR_NONE) {
	h = gethostbyname((const char *) host);

	if (h == NULL \|\| h->h_addr_list[0] == NULL) {
	u->err = "host not found";
	return NGX_ERROR;
	}

	u->addr.in_addr = (in_addr_t ) (h->h_addr_list[0]);
	}

	} else {
	u->addr.in_addr = INADDR_ANY;
	}

	return NGX_OK;
	}

	if (u->host.len == 0) {
	u->err = "no host";
	return NGX_ERROR;
	}

	if (u->no_resolve) {
	return NGX_OK;
	}

	if (u->no_port) {
	u->port = u->default_port;
	}

	if (u->port == 0) {
	u->err = "no port";
	return NGX_ERROR;
	}

	if (ngx_inet_resolve_host(cf, u) != NGX_OK) {
	return NGX_ERROR;
	}

	return NGX_OK;
	}


	ngx_int_t
	ngx_inet_resolve_host(ngx_conf_t cf, ngx_url_t u)
	{
	u_char p, host;
	size_t len;
	in_addr_t in_addr;
	ngx_uint_t i;
	struct hostent *h;
	struct sockaddr_in *sin;

	host = ngx_palloc(cf->temp_pool, u->host.len + 1);
	if (host == NULL) {
	return NGX_ERROR;
	}

	(void) ngx_cpystrn(host, u->host.data, u->host.len + 1);

	/* AF_INET only */

	in_addr = inet_addr((char *) host);

	if (in_addr == INADDR_NONE) {
	h = gethostbyname((char *) host);

	if (h == NULL \|\| h->h_addr_list[0] == NULL) {
	u->err = "host not found";
	return NGX_ERROR;
	}

	if (u->one_addr == 0) {
	for (i = 0; h->h_addr_list[i] != NULL; i++) { /* void */ }

	} else {
	i = 1;
	}

	/* MP: ngx_shared_palloc() */

	u->addrs = ngx_pcalloc(cf->pool, i * sizeof(ngx_peer_addr_t));
	if (u->addrs == NULL) {
	return NGX_ERROR;
	}

	u->naddrs = i;

	for (i = 0; h->h_addr_list[i] != NULL; i++) {

	sin = ngx_pcalloc(cf->pool, sizeof(struct sockaddr_in));
	if (sin == NULL) {
	return NGX_ERROR;
	}

	sin->sin_family = AF_INET;
	sin->sin_port = htons(u->port);
	sin->sin_addr.s_addr = (in_addr_t ) (h->h_addr_list[i]);

	u->addrs[i].sockaddr = (struct sockaddr *) sin;
	u->addrs[i].socklen = sizeof(struct sockaddr_in);

	len = INET_ADDRSTRLEN - 1 + 1 + sizeof(":65536") - 1;

	p = ngx_palloc(cf->pool, len);
	if (p == NULL) {
	return NGX_ERROR;
	}

	len = ngx_sock_ntop(AF_INET, (struct sockaddr *) sin, p, len);

	u->addrs[i].name.len = ngx_sprintf(&p[len], ":%d", u->port) - p;
	u->addrs[i].name.data = p;
	}

	} else {

	/* MP: ngx_shared_palloc() */

	u->addrs = ngx_pcalloc(cf->pool, sizeof(ngx_peer_addr_t));
	if (u->addrs == NULL) {
	return NGX_ERROR;
	}

	sin = ngx_pcalloc(cf->pool, sizeof(struct sockaddr_in));
	if (sin == NULL) {
	return NGX_ERROR;
	}

	u->naddrs = 1;

	sin->sin_family = AF_INET;
	sin->sin_port = htons(u->port);
	sin->sin_addr.s_addr = in_addr;

	u->addrs[0].sockaddr = (struct sockaddr *) sin;
	u->addrs[0].socklen = sizeof(struct sockaddr_in);

	p = ngx_palloc(cf->pool, u->host.len + sizeof(":65536") - 1);
	if (p == NULL) {
	return NGX_ERROR;
	}

	u->addrs[0].name.len = ngx_sprintf(p, "%V:%d", &u->host, u->port) - p;
	u->addrs[0].name.data = p;
	}

	return NGX_OK;
	}