| |
| /* |
| * Copyright (C) Igor Sysoev |
| * Copyright (C) Nginx, Inc. |
| */ |
| |
| |
| #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; /* array of ngx_cidr_t */ |
| 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_add_variables(ngx_conf_t *cf); |
| static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf); |
| static ngx_http_realip_ctx_t *ngx_http_realip_get_module_ctx( |
| ngx_http_request_t *r); |
| |
| |
| static ngx_int_t ngx_http_realip_remote_addr_variable(ngx_http_request_t *r, |
| ngx_http_variable_value_t *v, uintptr_t data); |
| static ngx_int_t ngx_http_realip_remote_port_variable(ngx_http_request_t *r, |
| ngx_http_variable_value_t *v, uintptr_t data); |
| |
| |
| 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 = { |
| ngx_http_realip_add_variables, /* preconfiguration */ |
| ngx_http_realip_init, /* 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 */ |
| NULL, /* init module */ |
| NULL, /* init process */ |
| NULL, /* init thread */ |
| NULL, /* exit thread */ |
| NULL, /* exit process */ |
| NULL, /* exit master */ |
| NGX_MODULE_V1_PADDING |
| }; |
| |
| |
| static ngx_http_variable_t ngx_http_realip_vars[] = { |
| |
| { ngx_string("realip_remote_addr"), NULL, |
| ngx_http_realip_remote_addr_variable, 0, 0, 0 }, |
| |
| { ngx_string("realip_remote_port"), NULL, |
| ngx_http_realip_remote_port_variable, 0, 0, 0 }, |
| |
| ngx_http_null_variable |
| }; |
| |
| |
| 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_list_part_t *part; |
| ngx_table_elt_t *header, *xfwd; |
| ngx_connection_t *c; |
| ngx_http_realip_ctx_t *ctx; |
| ngx_http_realip_loc_conf_t *rlcf; |
| |
| rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module); |
| |
| if (rlcf->from == NULL) { |
| return NGX_DECLINED; |
| } |
| |
| ctx = ngx_http_realip_get_module_ctx(r); |
| |
| if (ctx) { |
| 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 == NULL) { |
| return NGX_DECLINED; |
| } |
| |
| value = NULL; |
| |
| break; |
| |
| case NGX_HTTP_REALIP_PROXY: |
| |
| if (r->connection->proxy_protocol == NULL) { |
| return NGX_DECLINED; |
| } |
| |
| value = &r->connection->proxy_protocol->src_addr; |
| xfwd = NULL; |
| |
| break; |
| |
| default: /* NGX_HTTP_REALIP_HEADER */ |
| |
| part = &r->headers_in.headers.part; |
| header = part->elts; |
| |
| hash = rlcf->hash; |
| len = rlcf->header.len; |
| p = rlcf->header.data; |
| |
| for (i = 0; /* void */ ; 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; |
| /* addr.name = c->addr_text; */ |
| |
| if (ngx_http_get_forwarded_addr(r, &addr, xfwd, value, rlcf->from, |
| rlcf->recursive) |
| != NGX_DECLINED) |
| { |
| if (rlcf->type == NGX_HTTP_REALIP_PROXY) { |
| ngx_inet_set_port(addr.sockaddr, c->proxy_protocol->src_port); |
| } |
| |
| 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; |
| |
| 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; |
| ngx_http_set_ctx(r, ctx, ngx_http_realip_module); |
| |
| 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_url_t u; |
| ngx_cidr_t c, *cidr; |
| ngx_uint_t i; |
| struct sockaddr_in *sin; |
| #if (NGX_HAVE_INET6) |
| struct sockaddr_in6 *sin6; |
| #endif |
| |
| 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; |
| } |
| } |
| |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| |
| if (ngx_strcmp(value[1].data, "unix:") == 0) { |
| cidr = ngx_array_push(rlcf->from); |
| if (cidr == NULL) { |
| return NGX_CONF_ERROR; |
| } |
| |
| cidr->family = AF_UNIX; |
| return NGX_CONF_OK; |
| } |
| |
| #endif |
| |
| rc = ngx_ptocidr(&value[1], &c); |
| |
| if (rc != NGX_ERROR) { |
| if (rc == NGX_DONE) { |
| ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
| "low address bits of %V are meaningless", |
| &value[1]); |
| } |
| |
| cidr = ngx_array_push(rlcf->from); |
| if (cidr == NULL) { |
| return NGX_CONF_ERROR; |
| } |
| |
| *cidr = c; |
| |
| return NGX_CONF_OK; |
| } |
| |
| ngx_memzero(&u, sizeof(ngx_url_t)); |
| u.host = value[1]; |
| |
| if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) { |
| if (u.err) { |
| ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| "%s in set_real_ip_from \"%V\"", |
| u.err, &u.host); |
| } |
| |
| return NGX_CONF_ERROR; |
| } |
| |
| cidr = ngx_array_push_n(rlcf->from, u.naddrs); |
| if (cidr == NULL) { |
| return NGX_CONF_ERROR; |
| } |
| |
| ngx_memzero(cidr, u.naddrs * sizeof(ngx_cidr_t)); |
| |
| for (i = 0; i < u.naddrs; i++) { |
| cidr[i].family = u.addrs[i].sockaddr->sa_family; |
| |
| switch (cidr[i].family) { |
| |
| #if (NGX_HAVE_INET6) |
| case AF_INET6: |
| sin6 = (struct sockaddr_in6 *) u.addrs[i].sockaddr; |
| cidr[i].u.in6.addr = sin6->sin6_addr; |
| ngx_memset(cidr[i].u.in6.mask.s6_addr, 0xff, 16); |
| break; |
| #endif |
| |
| default: /* AF_INET */ |
| sin = (struct sockaddr_in *) u.addrs[i].sockaddr; |
| cidr[i].u.in.addr = sin->sin_addr.s_addr; |
| cidr[i].u.in.mask = 0xffffffff; |
| break; |
| } |
| } |
| |
| 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; |
| |
| if (rlcf->type != NGX_CONF_UNSET_UINT) { |
| return "is duplicate"; |
| } |
| |
| 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; |
| } |
| |
| /* |
| * set by ngx_pcalloc(): |
| * |
| * conf->from = NULL; |
| * conf->hash = 0; |
| * conf->header = { 0, 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_add_variables(ngx_conf_t *cf) |
| { |
| ngx_http_variable_t *var, *v; |
| |
| for (v = ngx_http_realip_vars; v->name.len; v++) { |
| var = ngx_http_add_variable(cf, &v->name, v->flags); |
| if (var == NULL) { |
| return NGX_ERROR; |
| } |
| |
| var->get_handler = v->get_handler; |
| var->data = v->data; |
| } |
| |
| return NGX_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; |
| } |
| |
| |
| static ngx_http_realip_ctx_t * |
| ngx_http_realip_get_module_ctx(ngx_http_request_t *r) |
| { |
| ngx_pool_cleanup_t *cln; |
| ngx_http_realip_ctx_t *ctx; |
| |
| ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module); |
| |
| if (ctx == NULL && (r->internal || r->filter_finalize)) { |
| |
| /* |
| * if module context was reset, the original address |
| * can still be found in the cleanup handler |
| */ |
| |
| for (cln = r->pool->cleanup; cln; cln = cln->next) { |
| if (cln->handler == ngx_http_realip_cleanup) { |
| ctx = cln->data; |
| break; |
| } |
| } |
| } |
| |
| return ctx; |
| } |
| |
| |
| static ngx_int_t |
| ngx_http_realip_remote_addr_variable(ngx_http_request_t *r, |
| ngx_http_variable_value_t *v, uintptr_t data) |
| { |
| ngx_str_t *addr_text; |
| ngx_http_realip_ctx_t *ctx; |
| |
| ctx = ngx_http_realip_get_module_ctx(r); |
| |
| addr_text = ctx ? &ctx->addr_text : &r->connection->addr_text; |
| |
| v->len = addr_text->len; |
| v->valid = 1; |
| v->no_cacheable = 0; |
| v->not_found = 0; |
| v->data = addr_text->data; |
| |
| return NGX_OK; |
| } |
| |
| |
| static ngx_int_t |
| ngx_http_realip_remote_port_variable(ngx_http_request_t *r, |
| ngx_http_variable_value_t *v, uintptr_t data) |
| { |
| ngx_uint_t port; |
| struct sockaddr *sa; |
| ngx_http_realip_ctx_t *ctx; |
| |
| ctx = ngx_http_realip_get_module_ctx(r); |
| |
| sa = ctx ? ctx->sockaddr : r->connection->sockaddr; |
| |
| v->len = 0; |
| v->valid = 1; |
| v->no_cacheable = 0; |
| v->not_found = 0; |
| |
| v->data = ngx_pnalloc(r->pool, sizeof("65535") - 1); |
| if (v->data == NULL) { |
| return NGX_ERROR; |
| } |
| |
| port = ngx_inet_get_port(sa); |
| |
| if (port > 0 && port < 65536) { |
| v->len = ngx_sprintf(v->data, "%ui", port) - v->data; |
| } |
| |
| return NGX_OK; |
| } |