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ngx_inet.c
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ngx_inet.c
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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
static ngx_int_t ngx_parse_unix_domain_url(ngx_pool_t *pool, ngx_url_t *u);
static ngx_int_t ngx_parse_inet_url(ngx_pool_t *pool, ngx_url_t *u);
static ngx_int_t ngx_parse_inet6_url(ngx_pool_t *pool, ngx_url_t *u);
in_addr_t
ngx_inet_addr(u_char *text, size_t len)
{
u_char *p, c;
in_addr_t addr;
ngx_uint_t octet, n;
addr = 0;
octet = 0;
n = 0;
for (p = text; p < text + len; p++) {
c = *p;
if (c >= '0' && c <= '9') {
octet = octet * 10 + (c - '0');
if (octet > 255) {
return INADDR_NONE;
}
continue;
}
if (c == '.') {
addr = (addr << 8) + octet;
octet = 0;
n++;
continue;
}
return INADDR_NONE;
}
if (n == 3) {
addr = (addr << 8) + octet;
return htonl(addr);
}
return INADDR_NONE;
}
#if (NGX_HAVE_INET6)
ngx_int_t
ngx_inet6_addr(u_char *p, size_t len, u_char *addr)
{
u_char c, *zero, *digit, *s, *d;
size_t len4;
ngx_uint_t n, nibbles, word;
if (len == 0) {
return NGX_ERROR;
}
zero = NULL;
digit = NULL;
len4 = 0;
nibbles = 0;
word = 0;
n = 8;
if (p[0] == ':') {
p++;
len--;
}
for (/* void */; len; len--) {
c = *p++;
if (c == ':') {
if (nibbles) {
digit = p;
len4 = len;
*addr++ = (u_char) (word >> 8);
*addr++ = (u_char) (word & 0xff);
if (--n) {
nibbles = 0;
word = 0;
continue;
}
} else {
if (zero == NULL) {
digit = p;
len4 = len;
zero = addr;
continue;
}
}
return NGX_ERROR;
}
if (c == '.' && nibbles) {
if (n < 2 || digit == NULL) {
return NGX_ERROR;
}
word = ngx_inet_addr(digit, len4 - 1);
if (word == INADDR_NONE) {
return NGX_ERROR;
}
word = ntohl(word);
*addr++ = (u_char) ((word >> 24) & 0xff);
*addr++ = (u_char) ((word >> 16) & 0xff);
n--;
break;
}
if (++nibbles > 4) {
return NGX_ERROR;
}
if (c >= '0' && c <= '9') {
word = word * 16 + (c - '0');
continue;
}
c |= 0x20;
if (c >= 'a' && c <= 'f') {
word = word * 16 + (c - 'a') + 10;
continue;
}
return NGX_ERROR;
}
if (nibbles == 0 && zero == NULL) {
return NGX_ERROR;
}
*addr++ = (u_char) (word >> 8);
*addr++ = (u_char) (word & 0xff);
if (--n) {
if (zero) {
n *= 2;
s = addr - 1;
d = s + n;
while (s >= zero) {
*d-- = *s--;
}
ngx_memzero(zero, n);
return NGX_OK;
}
} else {
if (zero == NULL) {
return NGX_OK;
}
}
return NGX_ERROR;
}
#endif
size_t
ngx_sock_ntop(struct sockaddr *sa, socklen_t socklen, u_char *text, size_t len,
ngx_uint_t port)
{
u_char *p;
struct sockaddr_in *sin;
#if (NGX_HAVE_INET6)
size_t n;
struct sockaddr_in6 *sin6;
#endif
#if (NGX_HAVE_UNIX_DOMAIN)
struct sockaddr_un *saun;
#endif
switch (sa->sa_family) {
case AF_INET:
sin = (struct sockaddr_in *) sa;
p = (u_char *) &sin->sin_addr;
if (port) {
p = ngx_snprintf(text, len, "%ud.%ud.%ud.%ud:%d",
p[0], p[1], p[2], p[3], ntohs(sin->sin_port));
} else {
p = ngx_snprintf(text, len, "%ud.%ud.%ud.%ud",
p[0], p[1], p[2], p[3]);
}
return (p - text);
#if (NGX_HAVE_INET6)
case AF_INET6:
sin6 = (struct sockaddr_in6 *) sa;
n = 0;
if (port) {
text[n++] = '[';
}
n = ngx_inet6_ntop(sin6->sin6_addr.s6_addr, &text[n], len);
if (port) {
n = ngx_sprintf(&text[1 + n], "]:%d",
ntohs(sin6->sin6_port)) - text;
}
return n;
#endif
#if (NGX_HAVE_UNIX_DOMAIN)
case AF_UNIX:
saun = (struct sockaddr_un *) sa;
/* on Linux sockaddr might not include sun_path at all */
if (socklen <= (socklen_t) offsetof(struct sockaddr_un, sun_path)) {
p = ngx_snprintf(text, len, "unix:%Z");
} else {
p = ngx_snprintf(text, len, "unix:%s%Z", saun->sun_path);
}
/* we do not include trailing zero in address length */
return (p - text - 1);
#endif
default:
return 0;
}
}
size_t
ngx_inet_ntop(int family, void *addr, u_char *text, size_t len)
{
u_char *p;
switch (family) {
case AF_INET:
p = addr;
return ngx_snprintf(text, len, "%ud.%ud.%ud.%ud",
p[0], p[1], p[2], p[3])
- text;
#if (NGX_HAVE_INET6)
case AF_INET6:
return ngx_inet6_ntop(addr, text, len);
#endif
default:
return 0;
}
}
#if (NGX_HAVE_INET6)
size_t
ngx_inet6_ntop(u_char *p, u_char *text, size_t len)
{
u_char *dst;
size_t max, n;
ngx_uint_t i, zero, last;
if (len < NGX_INET6_ADDRSTRLEN) {
return 0;
}
zero = (ngx_uint_t) -1;
last = (ngx_uint_t) -1;
max = 1;
n = 0;
for (i = 0; i < 16; i += 2) {
if (p[i] || p[i + 1]) {
if (max < n) {
zero = last;
max = n;
}
n = 0;
continue;
}
if (n++ == 0) {
last = i;
}
}
if (max < n) {
zero = last;
max = n;
}
dst = text;
n = 16;
if (zero == 0) {
if ((max == 5 && p[10] == 0xff && p[11] == 0xff)
|| (max == 6)
|| (max == 7 && p[14] != 0 && p[15] != 1))
{
n = 12;
}
*dst++ = ':';
}
for (i = 0; i < n; i += 2) {
if (i == zero) {
*dst++ = ':';
i += (max - 1) * 2;
continue;
}
dst = ngx_sprintf(dst, "%xd", p[i] * 256 + p[i + 1]);
if (i < 14) {
*dst++ = ':';
}
}
if (n == 12) {
dst = ngx_sprintf(dst, "%ud.%ud.%ud.%ud", p[12], p[13], p[14], p[15]);
}
return dst - text;
}
#endif
ngx_int_t
ngx_ptocidr(ngx_str_t *text, ngx_cidr_t *cidr)
{
u_char *addr, *mask, *last;
size_t len;
ngx_int_t shift;
#if (NGX_HAVE_INET6)
ngx_int_t rc;
ngx_uint_t s, i;
#endif
addr = text->data;
last = addr + text->len;
mask = ngx_strlchr(addr, last, '/');
len = (mask ? mask : last) - addr;
cidr->u.in.addr = ngx_inet_addr(addr, len);
if (cidr->u.in.addr != INADDR_NONE) {
cidr->family = AF_INET;
if (mask == NULL) {
cidr->u.in.mask = 0xffffffff;
return NGX_OK;
}
#if (NGX_HAVE_INET6)
} else if (ngx_inet6_addr(addr, len, cidr->u.in6.addr.s6_addr) == NGX_OK) {
cidr->family = AF_INET6;
if (mask == NULL) {
ngx_memset(cidr->u.in6.mask.s6_addr, 0xff, 16);
return NGX_OK;
}
#endif
} else {
return NGX_ERROR;
}
mask++;
shift = ngx_atoi(mask, last - mask);
if (shift == NGX_ERROR) {
return NGX_ERROR;
}
switch (cidr->family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
if (shift > 128) {
return NGX_ERROR;
}
addr = cidr->u.in6.addr.s6_addr;
mask = cidr->u.in6.mask.s6_addr;
rc = NGX_OK;
for (i = 0; i < 16; i++) {
s = (shift > 8) ? 8 : shift;
shift -= s;
mask[i] = (u_char) (0xffu << (8 - s));
if (addr[i] != (addr[i] & mask[i])) {
rc = NGX_DONE;
addr[i] &= mask[i];
}
}
return rc;
#endif
default: /* AF_INET */
if (shift > 32) {
return NGX_ERROR;
}
if (shift) {
cidr->u.in.mask = htonl((uint32_t) (0xffffffffu << (32 - shift)));
} else {
/* x86 compilers use a shl instruction that shifts by modulo 32 */
cidr->u.in.mask = 0;
}
if (cidr->u.in.addr == (cidr->u.in.addr & cidr->u.in.mask)) {
return NGX_OK;
}
cidr->u.in.addr &= cidr->u.in.mask;
return NGX_DONE;
}
}
ngx_int_t
ngx_cidr_match(struct sockaddr *sa, ngx_array_t *cidrs)
{
#if (NGX_HAVE_INET6)
u_char *p;
#endif
in_addr_t inaddr;
ngx_cidr_t *cidr;
ngx_uint_t family, i;
#if (NGX_HAVE_INET6)
ngx_uint_t n;
struct in6_addr *inaddr6;
#endif
#if (NGX_SUPPRESS_WARN)
inaddr = 0;
#if (NGX_HAVE_INET6)
inaddr6 = NULL;
#endif
#endif
family = sa->sa_family;
if (family == AF_INET) {
inaddr = ((struct sockaddr_in *) sa)->sin_addr.s_addr;
}
#if (NGX_HAVE_INET6)
else if (family == AF_INET6) {
inaddr6 = &((struct sockaddr_in6 *) sa)->sin6_addr;
if (IN6_IS_ADDR_V4MAPPED(inaddr6)) {
family = AF_INET;
p = inaddr6->s6_addr;
inaddr = p[12] << 24;
inaddr += p[13] << 16;
inaddr += p[14] << 8;
inaddr += p[15];
inaddr = htonl(inaddr);
}
}
#endif
for (cidr = cidrs->elts, i = 0; i < cidrs->nelts; i++) {
if (cidr[i].family != family) {
goto next;
}
switch (family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
for (n = 0; n < 16; n++) {
if ((inaddr6->s6_addr[n] & cidr[i].u.in6.mask.s6_addr[n])
!= cidr[i].u.in6.addr.s6_addr[n])
{
goto next;
}
}
break;
#endif
#if (NGX_HAVE_UNIX_DOMAIN)
case AF_UNIX:
break;
#endif
default: /* AF_INET */
if ((inaddr & cidr[i].u.in.mask) != cidr[i].u.in.addr) {
goto next;
}
break;
}
return NGX_OK;
next:
continue;
}
return NGX_DECLINED;
}
ngx_int_t
ngx_parse_addr(ngx_pool_t *pool, ngx_addr_t *addr, u_char *text, size_t len)
{
in_addr_t inaddr;
ngx_uint_t family;
struct sockaddr_in *sin;
#if (NGX_HAVE_INET6)
struct in6_addr inaddr6;
struct sockaddr_in6 *sin6;
/*
* prevent MSVC8 warning:
* potentially uninitialized local variable 'inaddr6' used
*/
ngx_memzero(&inaddr6, sizeof(struct in6_addr));
#endif
inaddr = ngx_inet_addr(text, len);
if (inaddr != INADDR_NONE) {
family = AF_INET;
len = sizeof(struct sockaddr_in);
#if (NGX_HAVE_INET6)
} else if (ngx_inet6_addr(text, len, inaddr6.s6_addr) == NGX_OK) {
family = AF_INET6;
len = sizeof(struct sockaddr_in6);
#endif
} else {
return NGX_DECLINED;
}
addr->sockaddr = ngx_pcalloc(pool, len);
if (addr->sockaddr == NULL) {
return NGX_ERROR;
}
addr->sockaddr->sa_family = (u_char) family;
addr->socklen = len;
switch (family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
sin6 = (struct sockaddr_in6 *) addr->sockaddr;
ngx_memcpy(sin6->sin6_addr.s6_addr, inaddr6.s6_addr, 16);
break;
#endif
default: /* AF_INET */
sin = (struct sockaddr_in *) addr->sockaddr;
sin->sin_addr.s_addr = inaddr;
break;
}
return NGX_OK;
}
ngx_int_t
ngx_parse_addr_port(ngx_pool_t *pool, ngx_addr_t *addr, u_char *text,
size_t len)
{
u_char *p, *last;
size_t plen;
ngx_int_t rc, port;
rc = ngx_parse_addr(pool, addr, text, len);
if (rc != NGX_DECLINED) {
return rc;
}
last = text + len;
#if (NGX_HAVE_INET6)
if (len && text[0] == '[') {
p = ngx_strlchr(text, last, ']');
if (p == NULL || p == last - 1 || *++p != ':') {
return NGX_DECLINED;
}
text++;
len -= 2;
} else
#endif
{
p = ngx_strlchr(text, last, ':');
if (p == NULL) {
return NGX_DECLINED;
}
}
p++;
plen = last - p;
port = ngx_atoi(p, plen);
if (port < 1 || port > 65535) {
return NGX_DECLINED;
}
len -= plen + 1;
rc = ngx_parse_addr(pool, addr, text, len);
if (rc != NGX_OK) {
return rc;
}
ngx_inet_set_port(addr->sockaddr, (in_port_t) port);
return NGX_OK;
}
ngx_int_t
ngx_parse_url(ngx_pool_t *pool, ngx_url_t *u)
{
u_char *p;
size_t len;
p = u->url.data;
len = u->url.len;
if (len >= 5 && ngx_strncasecmp(p, (u_char *) "unix:", 5) == 0) {
return ngx_parse_unix_domain_url(pool, u);
}
if (len && p[0] == '[') {
return ngx_parse_inet6_url(pool, u);
}
return ngx_parse_inet_url(pool, u);
}
static ngx_int_t
ngx_parse_unix_domain_url(ngx_pool_t *pool, ngx_url_t *u)
{
#if (NGX_HAVE_UNIX_DOMAIN)
u_char *path, *uri, *last;
size_t len;
struct sockaddr_un *saun;
len = u->url.len;
path = u->url.data;
path += 5;
len -= 5;
if (u->uri_part) {
last = path + len;
uri = ngx_strlchr(path, last, ':');
if (uri) {
len = uri - path;
uri++;
u->uri.len = last - uri;
u->uri.data = uri;
}
}
if (len == 0) {
u->err = "no path in the unix domain socket";
return NGX_ERROR;
}
u->host.len = len++;
u->host.data = path;
if (len > sizeof(saun->sun_path)) {
u->err = "too long path in the unix domain socket";
return NGX_ERROR;
}
u->socklen = sizeof(struct sockaddr_un);
saun = (struct sockaddr_un *) &u->sockaddr;
saun->sun_family = AF_UNIX;
(void) ngx_cpystrn((u_char *) saun->sun_path, path, len);
u->addrs = ngx_pcalloc(pool, sizeof(ngx_addr_t));
if (u->addrs == NULL) {
return NGX_ERROR;
}
saun = ngx_pcalloc(pool, sizeof(struct sockaddr_un));
if (saun == NULL) {
return NGX_ERROR;
}
u->family = AF_UNIX;
u->naddrs = 1;
saun->sun_family = AF_UNIX;
(void) ngx_cpystrn((u_char *) saun->sun_path, path, len);
u->addrs[0].sockaddr = (struct sockaddr *) saun;
u->addrs[0].socklen = sizeof(struct sockaddr_un);
u->addrs[0].name.len = len + 4;
u->addrs[0].name.data = u->url.data;
return NGX_OK;
#else
u->err = "the unix domain sockets are not supported on this platform";
return NGX_ERROR;
#endif
}
static ngx_int_t
ngx_parse_inet_url(ngx_pool_t *pool, ngx_url_t *u)
{
u_char *p, *host, *port, *last, *uri, *args;
size_t len;
ngx_int_t n;
struct sockaddr_in *sin;
#if (NGX_HAVE_INET6)
struct sockaddr_in6 *sin6;
#endif
u->socklen = sizeof(struct sockaddr_in);
sin = (struct sockaddr_in *) &u->sockaddr;
sin->sin_family = AF_INET;
u->family = AF_INET;
host = u->url.data;
last = host + u->url.len;
port = ngx_strlchr(host, last, ':');
uri = ngx_strlchr(host, last, '/');
args = ngx_strlchr(host, last, '?');
if (args) {
if (uri == NULL || args < uri) {
uri = args;
}
}
if (uri) {
if (u->listen || !u->uri_part) {
u->err = "invalid host";
return NGX_ERROR;
}
u->uri.len = last - uri;
u->uri.data = uri;
last = uri;
if (uri < port) {
port = NULL;
}
}
if (port) {
port++;
len = last - port;
n = ngx_atoi(port, len);
if (n < 1 || n > 65535) {
u->err = "invalid port";
return NGX_ERROR;
}
u->port = (in_port_t) n;
sin->sin_port = htons((in_port_t) n);
u->port_text.len = len;
u->port_text.data = port;
last = port - 1;
} else {
if (uri == NULL) {
if (u->listen) {
/* test value as port only */
n = ngx_atoi(host, last - host);
if (n != NGX_ERROR) {
if (n < 1 || n > 65535) {
u->err = "invalid port";
return NGX_ERROR;
}
u->port = (in_port_t) n;
sin->sin_port = htons((in_port_t) n);
u->port_text.len = last - host;
u->port_text.data = host;
u->wildcard = 1;
return NGX_OK;
}
}
}
u->no_port = 1;
u->port = u->default_port;
sin->sin_port = htons(u->default_port);
}
len = last - host;
if (len == 0) {
u->err = "no host";
return NGX_ERROR;
}
u->host.len = len;
u->host.data = host;
if (u->listen && len == 1 && *host == '*') {
sin->sin_addr.s_addr = INADDR_ANY;
u->wildcard = 1;
return NGX_OK;
}
sin->sin_addr.s_addr = ngx_inet_addr(host, len);
if (sin->sin_addr.s_addr != INADDR_NONE) {
if (sin->sin_addr.s_addr == INADDR_ANY) {
u->wildcard = 1;
}
u->naddrs = 1;
u->addrs = ngx_pcalloc(pool, sizeof(ngx_addr_t));
if (u->addrs == NULL) {
return NGX_ERROR;
}
sin = ngx_pcalloc(pool, sizeof(struct sockaddr_in));
if (sin == NULL) {
return NGX_ERROR;
}
ngx_memcpy(sin, &u->sockaddr, sizeof(struct sockaddr_in));
u->addrs[0].sockaddr = (struct sockaddr *) sin;
u->addrs[0].socklen = sizeof(struct sockaddr_in);
p = ngx_pnalloc(pool, u->host.len + sizeof(":65535") - 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;
}
if (u->no_resolve) {
return NGX_OK;
}
if (ngx_inet_resolve_host(pool, u) != NGX_OK) {
return NGX_ERROR;
}
u->family = u->addrs[0].sockaddr->sa_family;
u->socklen = u->addrs[0].socklen;
ngx_memcpy(&u->sockaddr, u->addrs[0].sockaddr, u->addrs[0].socklen);
switch (u->family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
sin6 = (struct sockaddr_in6 *) &u->sockaddr;
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
u->wildcard = 1;
}
break;
#endif
default: /* AF_INET */
sin = (struct sockaddr_in *) &u->sockaddr;
if (sin->sin_addr.s_addr == INADDR_ANY) {
u->wildcard = 1;
}
break;
}
return NGX_OK;
}
static ngx_int_t
ngx_parse_inet6_url(ngx_pool_t *pool, ngx_url_t *u)
{
#if (NGX_HAVE_INET6)
u_char *p, *host, *port, *last, *uri;
size_t len;
ngx_int_t n;
struct sockaddr_in6 *sin6;
u->socklen = sizeof(struct sockaddr_in6);
sin6 = (struct sockaddr_in6 *) &u->sockaddr;
sin6->sin6_family = AF_INET6;
host = u->url.data + 1;
last = u->url.data + u->url.len;
p = ngx_strlchr(host, last, ']');
if (p == NULL) {
u->err = "invalid host";
return NGX_ERROR;
}
port = p + 1;
uri = ngx_strlchr(port, last, '/');
if (uri) {
if (u->listen || !u->uri_part) {