diff options
Diffstat (limited to 'src/http/modules/ngx_http_realip_module.c')
| -rw-r--r-- | src/http/modules/ngx_http_realip_module.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/src/http/modules/ngx_http_realip_module.c b/src/http/modules/ngx_http_realip_module.c new file mode 100644 index 000000000..8732423fd --- /dev/null +++ b/src/http/modules/ngx_http_realip_module.c @@ -0,0 +1,275 @@ + +/* + * Copyright (C) Igor Sysoev + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_http.h> + + +/* AF_INET only */ + +typedef struct { + in_addr_t mask; + in_addr_t addr; +} ngx_http_realip_from_t; + + +typedef struct { + ngx_array_t *from; /* array of ngx_http_realip_from_t */ + + ngx_uint_t xfwd; +} ngx_http_realip_loc_conf_t; + + +static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r); +static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, + void *conf); +static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf); +static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, + void *parent, void *child); +static ngx_int_t ngx_http_realip_init(ngx_cycle_t *cycle); + + +static ngx_conf_enum_t ngx_http_realip_header[] = { + { ngx_string("X-Forwarded-For"), 1 }, + { ngx_string("X-Real-IP"), 0 }, + { ngx_null_string, 0 } +}; + + +static ngx_command_t ngx_http_realip_commands[] = { + + { ngx_string("set_real_ip_from"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_http_realip_from, + NGX_HTTP_LOC_CONF_OFFSET, + 0, + NULL }, + + { ngx_string("real_ip_header"), + NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, + ngx_conf_set_enum_slot, + NGX_HTTP_LOC_CONF_OFFSET, + offsetof(ngx_http_realip_loc_conf_t, xfwd), + &ngx_http_realip_header }, + + ngx_null_command +}; + + + +ngx_http_module_t ngx_http_realip_module_ctx = { + NULL, /* preconfiguration */ + NULL, /* postconfiguration */ + + NULL, /* create main configuration */ + NULL, /* init main configuration */ + + NULL, /* create server configuration */ + NULL, /* merge server configuration */ + + ngx_http_realip_create_loc_conf, /* create location configuration */ + ngx_http_realip_merge_loc_conf /* merge location configuration */ +}; + + +ngx_module_t ngx_http_realip_module = { + NGX_MODULE_V1, + &ngx_http_realip_module_ctx, /* module context */ + ngx_http_realip_commands, /* module directives */ + NGX_HTTP_MODULE, /* module type */ + NULL, /* init master */ + ngx_http_realip_init, /* init module */ + NULL, /* init process */ + NULL, /* init thread */ + NULL, /* exit thread */ + NULL, /* exit process */ + NULL, /* exit master */ + NGX_MODULE_V1_PADDING +}; + + +static ngx_int_t +ngx_http_realip_handler(ngx_http_request_t *r) +{ + u_char *ip, *p; + size_t len; + ngx_uint_t i; + struct sockaddr_in *sin; + ngx_http_realip_from_t *from; + ngx_http_realip_loc_conf_t *rlcf; + + if (r->realip_set) { + return NGX_OK; + } + + rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module); + + if (rlcf->from == NULL) { + return NGX_OK; + } + + if (rlcf->xfwd == 0) { + if (r->headers_in.x_real_ip == NULL) { + return NGX_OK; + } + + len = r->headers_in.x_real_ip->value.len; + ip = r->headers_in.x_real_ip->value.data; + + } else { + if (r->headers_in.x_forwarded_for == NULL) { + return NGX_OK; + } + + len = r->headers_in.x_forwarded_for->value.len; + ip = r->headers_in.x_forwarded_for->value.data; + + for (p = ip + len; p > ip; p--) { + if (*p == ' ' || *p == ',') { + p++; + len -= p - ip; + ip = p; + break; + } + } + } + + /* AF_INET only */ + + sin = (struct sockaddr_in *) r->connection->sockaddr; + + from = rlcf->from->elts; + for (i = 0; i < rlcf->from->nelts; i++) { + + ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, + "realip: %08XD %08XD %08XD", + sin->sin_addr.s_addr, from[i].mask, from[i].addr); + + if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) { + + r->connection->addr_text.len = len; + r->connection->addr_text.data = ip; + + sin->sin_addr.s_addr = inet_addr((char *) ip); + + r->realip_set = 1; + + return NGX_OK; + } + } + + return NGX_OK; +} + + +static char * +ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) +{ + ngx_http_realip_loc_conf_t *rlcf = conf; + + ngx_str_t *value; + ngx_inet_cidr_t in_cidr; + ngx_http_realip_from_t *from; + + if (rlcf->from == NULL) { + rlcf->from = ngx_array_create(cf->pool, 2, + sizeof(ngx_http_realip_from_t)); + if (rlcf->from == NULL) { + return NGX_CONF_ERROR; + } + } + + from = ngx_array_push(rlcf->from); + if (from == NULL) { + return NGX_CONF_ERROR; + } + + value = cf->args->elts; + + from->addr = inet_addr((char *) value[1].data); + + if (from->addr != INADDR_NONE) { + from->mask = 0xffffffff; + + return NGX_CONF_OK; + } + + if (ngx_ptocidr(&value[1], &in_cidr) == NGX_ERROR) { + ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", + &value[1]); + return NGX_CONF_ERROR; + } + + from->mask = in_cidr.mask; + from->addr = in_cidr.addr; + + return NGX_CONF_OK; +} + + +static void * +ngx_http_realip_create_loc_conf(ngx_conf_t *cf) +{ + ngx_http_realip_loc_conf_t *conf; + + conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t)); + if (conf == NULL) { + return NGX_CONF_ERROR; + } + + /* + * set by ngx_pcalloc(): + * + * conf->from = NULL; + */ + + conf->xfwd = NGX_CONF_UNSET_UINT; + + return conf; +} + + +static char * +ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) +{ + ngx_http_realip_loc_conf_t *prev = parent; + ngx_http_realip_loc_conf_t *conf = child; + + if (conf->from == NULL) { + conf->from = prev->from; + } + + ngx_conf_merge_unsigned_value(conf->xfwd, prev->xfwd, 0); + + return NGX_CONF_OK; +} + + +static ngx_int_t +ngx_http_realip_init(ngx_cycle_t *cycle) +{ + ngx_http_handler_pt *h; + ngx_http_core_main_conf_t *cmcf; + + cmcf = ngx_http_cycle_get_module_main_conf(cycle, ngx_http_core_module); + + h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers); + if (h == NULL) { + return NGX_ERROR; + } + + *h = ngx_http_realip_handler; + + h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers); + if (h == NULL) { + return NGX_ERROR; + } + + *h = ngx_http_realip_handler; + + return NGX_OK; +} |