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22223c75c9715e568f5710a8eed1fee9e7c2983f
nginx/src/stream/ngx_stream_core_module.c
Maxim Dounin 22223c75c9 Filtering duplicate addresses in listen (ticket #2400). 
Due to the glibc bug[1], getaddrinfo("localhost") with AI_ADDRCONFIG
on a typical host with glibc and without IPv6 returns two 127.0.0.1
addresses, and therefore "listen localhost:80;" used to result in
"duplicate ... address and port pair" after 4f9b72a229c1.

Fix is to explicitly filter out duplicate addresses returned during
resolution of a name.

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=14969
2022-11-23 17:30:08 +03:00

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/*
* Copyright (C) Roman Arutyunyan
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_stream.h>
static ngx_int_t ngx_stream_core_preconfiguration(ngx_conf_t *cf);
static void *ngx_stream_core_create_main_conf(ngx_conf_t *cf);
static char *ngx_stream_core_init_main_conf(ngx_conf_t *cf, void *conf);
static void *ngx_stream_core_create_srv_conf(ngx_conf_t *cf);
static char *ngx_stream_core_merge_srv_conf(ngx_conf_t *cf, void *parent,
void *child);
static char *ngx_stream_core_error_log(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_stream_core_server(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_stream_core_listen(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_stream_core_resolver(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_command_t ngx_stream_core_commands[] = {
{ ngx_string("variables_hash_max_size"),
NGX_STREAM_MAIN_CONF|NGX_CONF_TAKE1,
ngx_conf_set_num_slot,
NGX_STREAM_MAIN_CONF_OFFSET,
offsetof(ngx_stream_core_main_conf_t, variables_hash_max_size),
NULL },
{ ngx_string("variables_hash_bucket_size"),
NGX_STREAM_MAIN_CONF|NGX_CONF_TAKE1,
ngx_conf_set_num_slot,
NGX_STREAM_MAIN_CONF_OFFSET,
offsetof(ngx_stream_core_main_conf_t, variables_hash_bucket_size),
NULL },
{ ngx_string("server"),
NGX_STREAM_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_NOARGS,
ngx_stream_core_server,
0,
0,
NULL },
{ ngx_string("listen"),
NGX_STREAM_SRV_CONF|NGX_CONF_1MORE,
ngx_stream_core_listen,
NGX_STREAM_SRV_CONF_OFFSET,
0,
NULL },
{ ngx_string("error_log"),
NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_1MORE,
ngx_stream_core_error_log,
NGX_STREAM_SRV_CONF_OFFSET,
0,
NULL },
{ ngx_string("resolver"),
NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_1MORE,
ngx_stream_core_resolver,
NGX_STREAM_SRV_CONF_OFFSET,
0,
NULL },
{ ngx_string("resolver_timeout"),
NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_STREAM_SRV_CONF_OFFSET,
offsetof(ngx_stream_core_srv_conf_t, resolver_timeout),
NULL },
{ ngx_string("proxy_protocol_timeout"),
NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_STREAM_SRV_CONF_OFFSET,
offsetof(ngx_stream_core_srv_conf_t, proxy_protocol_timeout),
NULL },
{ ngx_string("tcp_nodelay"),
NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_STREAM_SRV_CONF_OFFSET,
offsetof(ngx_stream_core_srv_conf_t, tcp_nodelay),
NULL },
{ ngx_string("preread_buffer_size"),
NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_STREAM_SRV_CONF_OFFSET,
offsetof(ngx_stream_core_srv_conf_t, preread_buffer_size),
NULL },
{ ngx_string("preread_timeout"),
NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_STREAM_SRV_CONF_OFFSET,
offsetof(ngx_stream_core_srv_conf_t, preread_timeout),
NULL },
ngx_null_command
};
static ngx_stream_module_t ngx_stream_core_module_ctx = {
ngx_stream_core_preconfiguration, /* preconfiguration */
NULL, /* postconfiguration */
ngx_stream_core_create_main_conf, /* create main configuration */
ngx_stream_core_init_main_conf, /* init main configuration */
ngx_stream_core_create_srv_conf, /* create server configuration */
ngx_stream_core_merge_srv_conf /* merge server configuration */
};
ngx_module_t ngx_stream_core_module = {
NGX_MODULE_V1,
&ngx_stream_core_module_ctx, /* module context */
ngx_stream_core_commands, /* module directives */
NGX_STREAM_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
void
ngx_stream_core_run_phases(ngx_stream_session_t *s)
{
ngx_int_t rc;
ngx_stream_phase_handler_t *ph;
ngx_stream_core_main_conf_t *cmcf;
cmcf = ngx_stream_get_module_main_conf(s, ngx_stream_core_module);
ph = cmcf->phase_engine.handlers;
while (ph[s->phase_handler].checker) {
rc = ph[s->phase_handler].checker(s, &ph[s->phase_handler]);
if (rc == NGX_OK) {
return;
}
}
}
ngx_int_t
ngx_stream_core_generic_phase(ngx_stream_session_t *s,
ngx_stream_phase_handler_t *ph)
{
ngx_int_t rc;
/*
* generic phase checker,
* used by all phases, except for preread and content
*/
ngx_log_debug1(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
"generic phase: %ui", s->phase_handler);
rc = ph->handler(s);
if (rc == NGX_OK) {
s->phase_handler = ph->next;
return NGX_AGAIN;
}
if (rc == NGX_DECLINED) {
s->phase_handler++;
return NGX_AGAIN;
}
if (rc == NGX_AGAIN || rc == NGX_DONE) {
return NGX_OK;
}
if (rc == NGX_ERROR) {
rc = NGX_STREAM_INTERNAL_SERVER_ERROR;
}
ngx_stream_finalize_session(s, rc);
return NGX_OK;
}
ngx_int_t
ngx_stream_core_preread_phase(ngx_stream_session_t *s,
ngx_stream_phase_handler_t *ph)
{
size_t size;
ssize_t n;
ngx_int_t rc;
ngx_connection_t *c;
ngx_stream_core_srv_conf_t *cscf;
c = s->connection;
c->log->action = "prereading client data";
cscf = ngx_stream_get_module_srv_conf(s, ngx_stream_core_module);
if (c->read->timedout) {
rc = NGX_STREAM_OK;
} else if (c->read->timer_set) {
rc = NGX_AGAIN;
} else {
rc = ph->handler(s);
}
while (rc == NGX_AGAIN) {
if (c->buffer == NULL) {
c->buffer = ngx_create_temp_buf(c->pool, cscf->preread_buffer_size);
if (c->buffer == NULL) {
rc = NGX_ERROR;
break;
}
}
size = c->buffer->end - c->buffer->last;
if (size == 0) {
ngx_log_error(NGX_LOG_ERR, c->log, 0, "preread buffer full");
rc = NGX_STREAM_BAD_REQUEST;
break;
}
if (c->read->eof) {
rc = NGX_STREAM_OK;
break;
}
if (!c->read->ready) {
break;
}
n = c->recv(c, c->buffer->last, size);
if (n == NGX_ERROR || n == 0) {
rc = NGX_STREAM_OK;
break;
}
if (n == NGX_AGAIN) {
break;
}
c->buffer->last += n;
rc = ph->handler(s);
}
if (rc == NGX_AGAIN) {
if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
ngx_stream_finalize_session(s, NGX_STREAM_INTERNAL_SERVER_ERROR);
return NGX_OK;
}
if (!c->read->timer_set) {
ngx_add_timer(c->read, cscf->preread_timeout);
}
c->read->handler = ngx_stream_session_handler;
return NGX_OK;
}
if (c->read->timer_set) {
ngx_del_timer(c->read);
}
if (rc == NGX_OK) {
s->phase_handler = ph->next;
return NGX_AGAIN;
}
if (rc == NGX_DECLINED) {
s->phase_handler++;
return NGX_AGAIN;
}
if (rc == NGX_DONE) {
return NGX_OK;
}
if (rc == NGX_ERROR) {
rc = NGX_STREAM_INTERNAL_SERVER_ERROR;
}
ngx_stream_finalize_session(s, rc);
return NGX_OK;
}
ngx_int_t
ngx_stream_core_content_phase(ngx_stream_session_t *s,
ngx_stream_phase_handler_t *ph)
{
ngx_connection_t *c;
ngx_stream_core_srv_conf_t *cscf;
c = s->connection;
c->log->action = NULL;
cscf = ngx_stream_get_module_srv_conf(s, ngx_stream_core_module);
if (c->type == SOCK_STREAM
&& cscf->tcp_nodelay
&& ngx_tcp_nodelay(c) != NGX_OK)
{
ngx_stream_finalize_session(s, NGX_STREAM_INTERNAL_SERVER_ERROR);
return NGX_OK;
}
cscf->handler(s);
return NGX_OK;
}
static ngx_int_t
ngx_stream_core_preconfiguration(ngx_conf_t *cf)
{
return ngx_stream_variables_add_core_vars(cf);
}
static void *
ngx_stream_core_create_main_conf(ngx_conf_t *cf)
{
ngx_stream_core_main_conf_t *cmcf;
cmcf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_core_main_conf_t));
if (cmcf == NULL) {
return NULL;
}
if (ngx_array_init(&cmcf->servers, cf->pool, 4,
sizeof(ngx_stream_core_srv_conf_t *))
!= NGX_OK)
{
return NULL;
}
if (ngx_array_init(&cmcf->listen, cf->pool, 4, sizeof(ngx_stream_listen_t))
!= NGX_OK)
{
return NULL;
}
cmcf->variables_hash_max_size = NGX_CONF_UNSET_UINT;
cmcf->variables_hash_bucket_size = NGX_CONF_UNSET_UINT;
return cmcf;
}
static char *
ngx_stream_core_init_main_conf(ngx_conf_t *cf, void *conf)
{
ngx_stream_core_main_conf_t *cmcf = conf;
ngx_conf_init_uint_value(cmcf->variables_hash_max_size, 1024);
ngx_conf_init_uint_value(cmcf->variables_hash_bucket_size, 64);
cmcf->variables_hash_bucket_size =
ngx_align(cmcf->variables_hash_bucket_size, ngx_cacheline_size);
if (cmcf->ncaptures) {
cmcf->ncaptures = (cmcf->ncaptures + 1) * 3;
}
return NGX_CONF_OK;
}
static void *
ngx_stream_core_create_srv_conf(ngx_conf_t *cf)
{
ngx_stream_core_srv_conf_t *cscf;
cscf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_core_srv_conf_t));
if (cscf == NULL) {
return NULL;
}
/*
* set by ngx_pcalloc():
*
* cscf->handler = NULL;
* cscf->error_log = NULL;
*/
cscf->file_name = cf->conf_file->file.name.data;
cscf->line = cf->conf_file->line;
cscf->resolver_timeout = NGX_CONF_UNSET_MSEC;
cscf->proxy_protocol_timeout = NGX_CONF_UNSET_MSEC;
cscf->tcp_nodelay = NGX_CONF_UNSET;
cscf->preread_buffer_size = NGX_CONF_UNSET_SIZE;
cscf->preread_timeout = NGX_CONF_UNSET_MSEC;
return cscf;
}
static char *
ngx_stream_core_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_stream_core_srv_conf_t *prev = parent;
ngx_stream_core_srv_conf_t *conf = child;
ngx_conf_merge_msec_value(conf->resolver_timeout,
prev->resolver_timeout, 30000);
if (conf->resolver == NULL) {
if (prev->resolver == NULL) {
/*
* create dummy resolver in stream {} context
* to inherit it in all servers
*/
prev->resolver = ngx_resolver_create(cf, NULL, 0);
if (prev->resolver == NULL) {
return NGX_CONF_ERROR;
}
}
conf->resolver = prev->resolver;
}
if (conf->handler == NULL) {
ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
"no handler for server in %s:%ui",
conf->file_name, conf->line);
return NGX_CONF_ERROR;
}
if (conf->error_log == NULL) {
if (prev->error_log) {
conf->error_log = prev->error_log;
} else {
conf->error_log = &cf->cycle->new_log;
}
}
ngx_conf_merge_msec_value(conf->proxy_protocol_timeout,
prev->proxy_protocol_timeout, 30000);
ngx_conf_merge_value(conf->tcp_nodelay, prev->tcp_nodelay, 1);
ngx_conf_merge_size_value(conf->preread_buffer_size,
prev->preread_buffer_size, 16384);
ngx_conf_merge_msec_value(conf->preread_timeout,
prev->preread_timeout, 30000);
return NGX_CONF_OK;
}
static char *
ngx_stream_core_error_log(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_stream_core_srv_conf_t *cscf = conf;
return ngx_log_set_log(cf, &cscf->error_log);
}
static char *
ngx_stream_core_server(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
char *rv;
void *mconf;
ngx_uint_t m;
ngx_conf_t pcf;
ngx_stream_module_t *module;
ngx_stream_conf_ctx_t *ctx, *stream_ctx;
ngx_stream_core_srv_conf_t *cscf, **cscfp;
ngx_stream_core_main_conf_t *cmcf;
ctx = ngx_pcalloc(cf->pool, sizeof(ngx_stream_conf_ctx_t));
if (ctx == NULL) {
return NGX_CONF_ERROR;
}
stream_ctx = cf->ctx;
ctx->main_conf = stream_ctx->main_conf;
/* the server{}'s srv_conf */
ctx->srv_conf = ngx_pcalloc(cf->pool,
sizeof(void *) * ngx_stream_max_module);
if (ctx->srv_conf == NULL) {
return NGX_CONF_ERROR;
}
for (m = 0; cf->cycle->modules[m]; m++) {
if (cf->cycle->modules[m]->type != NGX_STREAM_MODULE) {
continue;
}
module = cf->cycle->modules[m]->ctx;
if (module->create_srv_conf) {
mconf = module->create_srv_conf(cf);
if (mconf == NULL) {
return NGX_CONF_ERROR;
}
ctx->srv_conf[cf->cycle->modules[m]->ctx_index] = mconf;
}
}
/* the server configuration context */
cscf = ctx->srv_conf[ngx_stream_core_module.ctx_index];
cscf->ctx = ctx;
cmcf = ctx->main_conf[ngx_stream_core_module.ctx_index];
cscfp = ngx_array_push(&cmcf->servers);
if (cscfp == NULL) {
return NGX_CONF_ERROR;
}
*cscfp = cscf;
/* parse inside server{} */
pcf = *cf;
cf->ctx = ctx;
cf->cmd_type = NGX_STREAM_SRV_CONF;
rv = ngx_conf_parse(cf, NULL);
*cf = pcf;
if (rv == NGX_CONF_OK && !cscf->listen) {
ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
"no \"listen\" is defined for server in %s:%ui",
cscf->file_name, cscf->line);
return NGX_CONF_ERROR;
}
return rv;
}
static char *
ngx_stream_core_listen(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_stream_core_srv_conf_t *cscf = conf;
ngx_str_t *value, size;
ngx_url_t u;
ngx_uint_t i, n, backlog;
ngx_stream_listen_t *ls, *als, *nls;
ngx_stream_core_main_conf_t *cmcf;
cscf->listen = 1;
value = cf->args->elts;
ngx_memzero(&u, sizeof(ngx_url_t));
u.url = value[1];
u.listen = 1;
if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
if (u.err) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"%s in \"%V\" of the \"listen\" directive",
u.err, &u.url);
}
return NGX_CONF_ERROR;
}
cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);
ls = ngx_array_push(&cmcf->listen);
if (ls == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(ls, sizeof(ngx_stream_listen_t));
ls->backlog = NGX_LISTEN_BACKLOG;
ls->rcvbuf = -1;
ls->sndbuf = -1;
ls->type = SOCK_STREAM;
ls->ctx = cf->ctx;
#if (NGX_HAVE_TCP_FASTOPEN)
ls->fastopen = -1;
#endif
#if (NGX_HAVE_INET6)
ls->ipv6only = 1;
#endif
backlog = 0;
for (i = 2; i < cf->args->nelts; i++) {
#if !(NGX_WIN32)
if (ngx_strcmp(value[i].data, "udp") == 0) {
ls->type = SOCK_DGRAM;
continue;
}
#endif
if (ngx_strcmp(value[i].data, "bind") == 0) {
ls->bind = 1;
continue;
}
#if (NGX_HAVE_TCP_FASTOPEN)
if (ngx_strncmp(value[i].data, "fastopen=", 9) == 0) {
ls->fastopen = ngx_atoi(value[i].data + 9, value[i].len - 9);
ls->bind = 1;
if (ls->fastopen == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid fastopen \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
#endif
if (ngx_strncmp(value[i].data, "backlog=", 8) == 0) {
ls->backlog = ngx_atoi(value[i].data + 8, value[i].len - 8);
ls->bind = 1;
if (ls->backlog == NGX_ERROR || ls->backlog == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid backlog \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
backlog = 1;
continue;
}
if (ngx_strncmp(value[i].data, "rcvbuf=", 7) == 0) {
size.len = value[i].len - 7;
size.data = value[i].data + 7;
ls->rcvbuf = ngx_parse_size(&size);
ls->bind = 1;
if (ls->rcvbuf == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid rcvbuf \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "sndbuf=", 7) == 0) {
size.len = value[i].len - 7;
size.data = value[i].data + 7;
ls->sndbuf = ngx_parse_size(&size);
ls->bind = 1;
if (ls->sndbuf == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid sndbuf \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "ipv6only=o", 10) == 0) {
#if (NGX_HAVE_INET6 && defined IPV6_V6ONLY)
if (ngx_strcmp(&value[i].data[10], "n") == 0) {
ls->ipv6only = 1;
} else if (ngx_strcmp(&value[i].data[10], "ff") == 0) {
ls->ipv6only = 0;
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid ipv6only flags \"%s\"",
&value[i].data[9]);
return NGX_CONF_ERROR;
}
ls->bind = 1;
continue;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"bind ipv6only is not supported "
"on this platform");
return NGX_CONF_ERROR;
#endif
}
if (ngx_strcmp(value[i].data, "reuseport") == 0) {
#if (NGX_HAVE_REUSEPORT)
ls->reuseport = 1;
ls->bind = 1;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"reuseport is not supported "
"on this platform, ignored");
#endif
continue;
}
if (ngx_strcmp(value[i].data, "ssl") == 0) {
#if (NGX_STREAM_SSL)
ngx_stream_ssl_conf_t *sslcf;
sslcf = ngx_stream_conf_get_module_srv_conf(cf,
ngx_stream_ssl_module);
sslcf->listen = 1;
sslcf->file = cf->conf_file->file.name.data;
sslcf->line = cf->conf_file->line;
ls->ssl = 1;
continue;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"the \"ssl\" parameter requires "
"ngx_stream_ssl_module");
return NGX_CONF_ERROR;
#endif
}
if (ngx_strncmp(value[i].data, "so_keepalive=", 13) == 0) {
if (ngx_strcmp(&value[i].data[13], "on") == 0) {
ls->so_keepalive = 1;
} else if (ngx_strcmp(&value[i].data[13], "off") == 0) {
ls->so_keepalive = 2;
} else {
#if (NGX_HAVE_KEEPALIVE_TUNABLE)
u_char *p, *end;
ngx_str_t s;
end = value[i].data + value[i].len;
s.data = value[i].data + 13;
p = ngx_strlchr(s.data, end, ':');
if (p == NULL) {
p = end;
}
if (p > s.data) {
s.len = p - s.data;
ls->tcp_keepidle = ngx_parse_time(&s, 1);
if (ls->tcp_keepidle == (time_t) NGX_ERROR) {
goto invalid_so_keepalive;
}
}
s.data = (p < end) ? (p + 1) : end;
p = ngx_strlchr(s.data, end, ':');
if (p == NULL) {
p = end;
}
if (p > s.data) {
s.len = p - s.data;
ls->tcp_keepintvl = ngx_parse_time(&s, 1);
if (ls->tcp_keepintvl == (time_t) NGX_ERROR) {
goto invalid_so_keepalive;
}
}
s.data = (p < end) ? (p + 1) : end;
if (s.data < end) {
s.len = end - s.data;
ls->tcp_keepcnt = ngx_atoi(s.data, s.len);
if (ls->tcp_keepcnt == NGX_ERROR) {
goto invalid_so_keepalive;
}
}
if (ls->tcp_keepidle == 0 && ls->tcp_keepintvl == 0
&& ls->tcp_keepcnt == 0)
{
goto invalid_so_keepalive;
}
ls->so_keepalive = 1;
#else
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"the \"so_keepalive\" parameter accepts "
"only \"on\" or \"off\" on this platform");
return NGX_CONF_ERROR;
#endif
}
ls->bind = 1;
continue;
#if (NGX_HAVE_KEEPALIVE_TUNABLE)
invalid_so_keepalive:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid so_keepalive value: \"%s\"",
&value[i].data[13]);
return NGX_CONF_ERROR;
#endif
}
if (ngx_strcmp(value[i].data, "proxy_protocol") == 0) {
ls->proxy_protocol = 1;
continue;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"the invalid \"%V\" parameter", &value[i]);
return NGX_CONF_ERROR;
}
if (ls->type == SOCK_DGRAM) {
if (backlog) {
return "\"backlog\" parameter is incompatible with \"udp\"";
}
#if (NGX_STREAM_SSL)
if (ls->ssl) {
return "\"ssl\" parameter is incompatible with \"udp\"";
}
#endif
if (ls->so_keepalive) {
return "\"so_keepalive\" parameter is incompatible with \"udp\"";
}
if (ls->proxy_protocol) {
return "\"proxy_protocol\" parameter is incompatible with \"udp\"";
}
#if (NGX_HAVE_TCP_FASTOPEN)
if (ls->fastopen != -1) {
return "\"fastopen\" parameter is incompatible with \"udp\"";
}
#endif
}
for (n = 0; n < u.naddrs; n++) {
for (i = 0; i < n; i++) {
if (ngx_cmp_sockaddr(u.addrs[n].sockaddr, u.addrs[n].socklen,
u.addrs[i].sockaddr, u.addrs[i].socklen, 0)
== NGX_OK)
{
goto next;
}
}
if (n != 0) {
nls = ngx_array_push(&cmcf->listen);
if (nls == NULL) {
return NGX_CONF_ERROR;
}
*nls = *ls;
} else {
nls = ls;
}
nls->sockaddr = u.addrs[n].sockaddr;
nls->socklen = u.addrs[n].socklen;
nls->addr_text = u.addrs[n].name;
nls->wildcard = ngx_inet_wildcard(nls->sockaddr);
als = cmcf->listen.elts;
for (i = 0; i < cmcf->listen.nelts - 1; i++) {
if (nls->type != als[i].type) {
continue;
}
if (ngx_cmp_sockaddr(als[i].sockaddr, als[i].socklen,
nls->sockaddr, nls->socklen, 1)
!= NGX_OK)
{
continue;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"duplicate \"%V\" address and port pair",
&nls->addr_text);
return NGX_CONF_ERROR;
}
next:
continue;
}
return NGX_CONF_OK;
}
static char *
ngx_stream_core_resolver(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_stream_core_srv_conf_t *cscf = conf;
ngx_str_t *value;
if (cscf->resolver) {
return "is duplicate";
}
value = cf->args->elts;
cscf->resolver = ngx_resolver_create(cf, &value[1], cf->args->nelts - 1);
if (cscf->resolver == NULL) {
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}
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