Mercurial > hg > nginx
view src/event/ngx_event_busy_lock.c @ 4668:ba2c7463ce18 stable-1.2
Merge of r4614, r4624-r4629, r4631: proxy recursive changes.
*) Added IPv6 and UNIX-domain socket support in "debug_connection"
directive.
*) New function ngx_http_get_forwarded_addr() to look up real client
address.
On input it takes an original address, string in the X-Forwarded-For format
and its length, list of trusted proxies, and a flag indicating to perform
the recursive search. On output it returns NGX_OK and the "deepest" valid
address in a chain, or NGX_DECLINED. It supports AF_INET and AF_INET6.
Additionally, original address and/or proxy may be specified as AF_UNIX.
*) Realip: chains of trusted proxies and IPv6 support.
The module now supports recursive search of client address through
the chain of trusted proxies, controlled by the "real_ip_recursive"
directive (closes #2). It also gets full IPv6 support (closes #44)
and canonical value of the $client_addr variable on address change.
Example:
real_ip_header X-Forwarded-For;
set_real_ip_from 127.0.0.0/8;
set_real_ip_from ::1;
set_real_ip_from unix:;
real_ip_recursive on;
*) Geo: chains of trusted proxies and partial IPv6 support.
The module now supports recursive search of client address through
the chain of trusted proxies, controlled by the "proxy_recursive"
directive in the "geo" block. It also gets partial IPv6 support:
now proxies may be specified with IPv6 addresses.
Example:
geo $test {
...
proxy 127.0.0.1;
proxy ::1;
proxy_recursive;
}
There's also a slight change in behavior. When original client
address (as specified by the "geo" directive) is one of the
trusted proxies, and the value of the X-Forwarded-For request
header cannot not be parsed as a valid address, an original client
address will be used for lookup. Previously, 255.255.255.255 was
used in this case.
*) Geoip: trusted proxies support and partial IPv6 support.
The module now supports recursive search of client address through the
chain of trusted proxies (closes #100), in the same scope as the geo
module. Proxies are listed by the "geoip_proxy" directive, recursive
search is enabled by the "geoip_proxy_recursive" directive. IPv6 is
partially supported: proxies may be specified with IPv6 addresses.
Example:
geoip_country .../GeoIP.dat;
geoip_proxy 127.0.0.1;
geoip_proxy ::1;
geoip_proxy 10.0.0.0/8;
geoip_proxy_recursive on;
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 04 Jun 2012 11:58:12 +0000 |
parents | d620f497c50f |
children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> static ngx_int_t ngx_event_busy_lock_look_cacheable(ngx_event_busy_lock_t *bl, ngx_event_busy_lock_ctx_t *ctx); static void ngx_event_busy_lock_handler(ngx_event_t *ev); static void ngx_event_busy_lock_posted_handler(ngx_event_t *ev); /* * NGX_OK: the busy lock is held * NGX_AGAIN: the all busy locks are held but we will wait the specified time * NGX_BUSY: ctx->timer == 0: there are many the busy locks * ctx->timer != 0: there are many the waiting locks */ ngx_int_t ngx_event_busy_lock(ngx_event_busy_lock_t *bl, ngx_event_busy_lock_ctx_t *ctx) { ngx_int_t rc; ngx_mutex_lock(bl->mutex); ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ctx->event->log, 0, "event busy lock: b:%d mb:%d", bl->busy, bl->max_busy); if (bl->busy < bl->max_busy) { bl->busy++; rc = NGX_OK; } else if (ctx->timer && bl->waiting < bl->max_waiting) { bl->waiting++; ngx_add_timer(ctx->event, ctx->timer); ctx->event->handler = ngx_event_busy_lock_handler; if (bl->events) { bl->last->next = ctx; } else { bl->events = ctx; } bl->last = ctx; rc = NGX_AGAIN; } else { rc = NGX_BUSY; } ngx_mutex_unlock(bl->mutex); return rc; } ngx_int_t ngx_event_busy_lock_cacheable(ngx_event_busy_lock_t *bl, ngx_event_busy_lock_ctx_t *ctx) { ngx_int_t rc; ngx_mutex_lock(bl->mutex); rc = ngx_event_busy_lock_look_cacheable(bl, ctx); ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ctx->event->log, 0, "event busy lock: %d w:%d mw:%d", rc, bl->waiting, bl->max_waiting); /* * NGX_OK: no the same request, there is free slot and we locked it * NGX_BUSY: no the same request and there is no free slot * NGX_AGAIN: the same request is processing */ if (rc == NGX_AGAIN) { if (ctx->timer && bl->waiting < bl->max_waiting) { bl->waiting++; ngx_add_timer(ctx->event, ctx->timer); ctx->event->handler = ngx_event_busy_lock_handler; if (bl->events == NULL) { bl->events = ctx; } else { bl->last->next = ctx; } bl->last = ctx; } else { rc = NGX_BUSY; } } ngx_mutex_unlock(bl->mutex); return rc; } void ngx_event_busy_unlock(ngx_event_busy_lock_t *bl, ngx_event_busy_lock_ctx_t *ctx) { ngx_event_t *ev; ngx_event_busy_lock_ctx_t *wakeup; ngx_mutex_lock(bl->mutex); if (bl->events) { wakeup = bl->events; bl->events = bl->events->next; } else { wakeup = NULL; bl->busy--; } /* * MP: all ctx's and their queue must be in shared memory, * each ctx has pid to wake up */ if (wakeup == NULL) { ngx_mutex_unlock(bl->mutex); return; } if (ctx->md5) { for (wakeup = bl->events; wakeup; wakeup = wakeup->next) { if (wakeup->md5 == NULL || wakeup->slot != ctx->slot) { continue; } wakeup->handler = ngx_event_busy_lock_posted_handler; wakeup->cache_updated = 1; ev = wakeup->event; ngx_post_event(ev, &ngx_posted_events); } ngx_mutex_unlock(bl->mutex); } else { bl->waiting--; ngx_mutex_unlock(bl->mutex); wakeup->handler = ngx_event_busy_lock_posted_handler; wakeup->locked = 1; ev = wakeup->event; if (ev->timer_set) { ngx_del_timer(ev); } ngx_post_event(ev, &ngx_posted_events); } } void ngx_event_busy_lock_cancel(ngx_event_busy_lock_t *bl, ngx_event_busy_lock_ctx_t *ctx) { ngx_event_busy_lock_ctx_t *c, *p; ngx_mutex_lock(bl->mutex); bl->waiting--; if (ctx == bl->events) { bl->events = ctx->next; } else { p = bl->events; for (c = bl->events->next; c; c = c->next) { if (c == ctx) { p->next = ctx->next; break; } p = c; } } ngx_mutex_unlock(bl->mutex); } static ngx_int_t ngx_event_busy_lock_look_cacheable(ngx_event_busy_lock_t *bl, ngx_event_busy_lock_ctx_t *ctx) { ngx_int_t free; ngx_uint_t i, bit, cacheable, mask; bit = 0; cacheable = 0; free = -1; #if (NGX_SUPPRESS_WARN) mask = 0; #endif for (i = 0; i < bl->max_busy; i++) { if ((bit & 7) == 0) { mask = bl->md5_mask[i / 8]; } if (mask & 1) { if (ngx_memcmp(&bl->md5[i * 16], ctx->md5, 16) == 0) { ctx->waiting = 1; ctx->slot = i; return NGX_AGAIN; } cacheable++; } else if (free == -1) { free = i; } if (cacheable == bl->cacheable) { if (free == -1 && cacheable < bl->max_busy) { free = i + 1; } break; } mask >>= 1; bit++; } if (free == -1) { return NGX_BUSY; } #if 0 if (bl->busy == bl->max_busy) { return NGX_BUSY; } #endif ngx_memcpy(&bl->md5[free * 16], ctx->md5, 16); bl->md5_mask[free / 8] |= 1 << (free & 7); ctx->slot = free; bl->cacheable++; bl->busy++; return NGX_OK; } static void ngx_event_busy_lock_handler(ngx_event_t *ev) { ev->handler = ngx_event_busy_lock_posted_handler; ngx_post_event(ev, &ngx_posted_events); } static void ngx_event_busy_lock_posted_handler(ngx_event_t *ev) { ngx_event_busy_lock_ctx_t *ctx; ctx = ev->data; ctx->handler(ev); }