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src/http/modules/ngx_http_realip_module.c - nginx-1.7.10
Global variables defined
Data types defined
Functions defined
Macros defined
Source code
- #include <ngx_config.h>
- #include <ngx_core.h>
- #include <ngx_http.h>
- #define NGX_HTTP_REALIP_XREALIP 0
- #define NGX_HTTP_REALIP_XFWD 1
- #define NGX_HTTP_REALIP_HEADER 2
- #define NGX_HTTP_REALIP_PROXY 3
- typedef struct {
- ngx_array_t *from;
- ngx_uint_t type;
- ngx_uint_t hash;
- ngx_str_t header;
- ngx_flag_t recursive;
- } ngx_http_realip_loc_conf_t;
- typedef struct {
- ngx_connection_t *connection;
- struct sockaddr *sockaddr;
- socklen_t socklen;
- ngx_str_t addr_text;
- } ngx_http_realip_ctx_t;
- static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r);
- static ngx_int_t ngx_http_realip_set_addr(ngx_http_request_t *r,
- ngx_addr_t *addr);
- static void ngx_http_realip_cleanup(void *data);
- static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd,
- void *conf);
- static char *ngx_http_realip(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_conf_t *cf);
- 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_http_realip,
- NGX_HTTP_LOC_CONF_OFFSET,
- 0,
- NULL },
- { ngx_string("real_ip_recursive"),
- NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
- ngx_conf_set_flag_slot,
- NGX_HTTP_LOC_CONF_OFFSET,
- offsetof(ngx_http_realip_loc_conf_t, recursive),
- NULL },
- ngx_null_command
- };
- static ngx_http_module_t ngx_http_realip_module_ctx = {
- NULL,
- ngx_http_realip_init,
- NULL,
- NULL,
- NULL,
- NULL,
- ngx_http_realip_create_loc_conf,
- ngx_http_realip_merge_loc_conf
- };
- ngx_module_t ngx_http_realip_module = {
- NGX_MODULE_V1,
- &ngx_http_realip_module_ctx,
- ngx_http_realip_commands,
- NGX_HTTP_MODULE,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NGX_MODULE_V1_PADDING
- };
- static ngx_int_t
- ngx_http_realip_handler(ngx_http_request_t *r)
- {
- u_char *p;
- size_t len;
- ngx_str_t *value;
- ngx_uint_t i, hash;
- ngx_addr_t addr;
- ngx_array_t *xfwd;
- ngx_list_part_t *part;
- ngx_table_elt_t *header;
- ngx_connection_t *c;
- ngx_http_realip_ctx_t *ctx;
- ngx_http_realip_loc_conf_t *rlcf;
- ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module);
- if (ctx) {
- return NGX_DECLINED;
- }
- rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module);
- if (rlcf->from == NULL) {
- return NGX_DECLINED;
- }
- switch (rlcf->type) {
- case NGX_HTTP_REALIP_XREALIP:
- if (r->headers_in.x_real_ip == NULL) {
- return NGX_DECLINED;
- }
- value = &r->headers_in.x_real_ip->value;
- xfwd = NULL;
- break;
- case NGX_HTTP_REALIP_XFWD:
- xfwd = &r->headers_in.x_forwarded_for;
- if (xfwd->elts == NULL) {
- return NGX_DECLINED;
- }
- value = NULL;
- break;
- case NGX_HTTP_REALIP_PROXY:
- value = &r->connection->proxy_protocol_addr;
- if (value->len == 0) {
- return NGX_DECLINED;
- }
- xfwd = NULL;
- break;
- default:
- part = &r->headers_in.headers.part;
- header = part->elts;
- hash = rlcf->hash;
- len = rlcf->header.len;
- p = rlcf->header.data;
- for (i = 0; ; i++) {
- if (i >= part->nelts) {
- if (part->next == NULL) {
- break;
- }
- part = part->next;
- header = part->elts;
- i = 0;
- }
- if (hash == header[i].hash
- && len == header[i].key.len
- && ngx_strncmp(p, header[i].lowcase_key, len) == 0)
- {
- value = &header[i].value;
- xfwd = NULL;
- goto found;
- }
- }
- return NGX_DECLINED;
- }
- found:
- c = r->connection;
- addr.sockaddr = c->sockaddr;
- addr.socklen = c->socklen;
-
- if (ngx_http_get_forwarded_addr(r, &addr, xfwd, value, rlcf->from,
- rlcf->recursive)
- != NGX_DECLINED)
- {
- return ngx_http_realip_set_addr(r, &addr);
- }
- return NGX_DECLINED;
- }
- static ngx_int_t
- ngx_http_realip_set_addr(ngx_http_request_t *r, ngx_addr_t *addr)
- {
- size_t len;
- u_char *p;
- u_char text[NGX_SOCKADDR_STRLEN];
- ngx_connection_t *c;
- ngx_pool_cleanup_t *cln;
- ngx_http_realip_ctx_t *ctx;
- cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t));
- if (cln == NULL) {
- return NGX_HTTP_INTERNAL_SERVER_ERROR;
- }
- ctx = cln->data;
- ngx_http_set_ctx(r, ctx, ngx_http_realip_module);
- c = r->connection;
- len = ngx_sock_ntop(addr->sockaddr, addr->socklen, text,
- NGX_SOCKADDR_STRLEN, 0);
- if (len == 0) {
- return NGX_HTTP_INTERNAL_SERVER_ERROR;
- }
- p = ngx_pnalloc(c->pool, len);
- if (p == NULL) {
- return NGX_HTTP_INTERNAL_SERVER_ERROR;
- }
- ngx_memcpy(p, text, len);
- cln->handler = ngx_http_realip_cleanup;
- ctx->connection = c;
- ctx->sockaddr = c->sockaddr;
- ctx->socklen = c->socklen;
- ctx->addr_text = c->addr_text;
- c->sockaddr = addr->sockaddr;
- c->socklen = addr->socklen;
- c->addr_text.len = len;
- c->addr_text.data = p;
- return NGX_DECLINED;
- }
- static void
- ngx_http_realip_cleanup(void *data)
- {
- ngx_http_realip_ctx_t *ctx = data;
- ngx_connection_t *c;
- c = ctx->connection;
- c->sockaddr = ctx->sockaddr;
- c->socklen = ctx->socklen;
- c->addr_text = ctx->addr_text;
- }
- 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_int_t rc;
- ngx_str_t *value;
- ngx_cidr_t *cidr;
- value = cf->args->elts;
- if (rlcf->from == NULL) {
- rlcf->from = ngx_array_create(cf->pool, 2,
- sizeof(ngx_cidr_t));
- if (rlcf->from == NULL) {
- return NGX_CONF_ERROR;
- }
- }
- cidr = ngx_array_push(rlcf->from);
- if (cidr == NULL) {
- return NGX_CONF_ERROR;
- }
- #if (NGX_HAVE_UNIX_DOMAIN)
- if (ngx_strcmp(value[1].data, "unix:") == 0) {
- cidr->family = AF_UNIX;
- return NGX_CONF_OK;
- }
- #endif
- rc = ngx_ptocidr(&value[1], cidr);
- if (rc == NGX_ERROR) {
- ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
- &value[1]);
- return NGX_CONF_ERROR;
- }
- if (rc == NGX_DONE) {
- ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
- "low address bits of %V are meaningless", &value[1]);
- }
- return NGX_CONF_OK;
- }
- static char *
- ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
- {
- ngx_http_realip_loc_conf_t *rlcf = conf;
- ngx_str_t *value;
- value = cf->args->elts;
- if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) {
- rlcf->type = NGX_HTTP_REALIP_XREALIP;
- return NGX_CONF_OK;
- }
- if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) {
- rlcf->type = NGX_HTTP_REALIP_XFWD;
- return NGX_CONF_OK;
- }
- if (ngx_strcmp(value[1].data, "proxy_protocol") == 0) {
- rlcf->type = NGX_HTTP_REALIP_PROXY;
- return NGX_CONF_OK;
- }
- rlcf->type = NGX_HTTP_REALIP_HEADER;
- rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len);
- rlcf->header = value[1];
- 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 NULL;
- }
-
- conf->type = NGX_CONF_UNSET_UINT;
- conf->recursive = NGX_CONF_UNSET;
- 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_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP);
- ngx_conf_merge_value(conf->recursive, prev->recursive, 0);
- if (conf->header.len == 0) {
- conf->hash = prev->hash;
- conf->header = prev->header;
- }
- return NGX_CONF_OK;
- }
- static ngx_int_t
- ngx_http_realip_init(ngx_conf_t *cf)
- {
- ngx_http_handler_pt *h;
- ngx_http_core_main_conf_t *cmcf;
- cmcf = ngx_http_conf_get_module_main_conf(cf, 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_PREACCESS_PHASE].handlers);
- if (h == NULL) {
- return NGX_ERROR;
- }
- *h = ngx_http_realip_handler;
- return NGX_OK;
- }
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