mirror of
https://github.com/nginx/nginx.git
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419 lines
10 KiB
C
419 lines
10 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_http.h>
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#define NGX_HTTP_REALIP_XREALIP 0
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#define NGX_HTTP_REALIP_XFWD 1
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#define NGX_HTTP_REALIP_HEADER 2
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typedef struct {
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in_addr_t mask;
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in_addr_t addr;
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} ngx_http_realip_from_t;
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typedef struct {
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ngx_array_t *from; /* array of ngx_http_realip_from_t */
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ngx_uint_t type;
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ngx_uint_t hash;
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ngx_str_t header;
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} ngx_http_realip_loc_conf_t;
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typedef struct {
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ngx_connection_t *connection;
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in_addr_t addr;
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ngx_str_t addr_text;
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} ngx_http_realip_ctx_t;
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static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r);
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static void ngx_http_realip_cleanup(void *data);
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static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd,
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void *conf);
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static char *ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf);
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static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf,
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void *parent, void *child);
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static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf);
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static ngx_command_t ngx_http_realip_commands[] = {
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{ ngx_string("set_real_ip_from"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_http_realip_from,
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NGX_HTTP_LOC_CONF_OFFSET,
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0,
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NULL },
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{ ngx_string("real_ip_header"),
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NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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ngx_http_realip,
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NGX_HTTP_LOC_CONF_OFFSET,
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0,
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NULL },
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ngx_null_command
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};
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static ngx_http_module_t ngx_http_realip_module_ctx = {
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NULL, /* preconfiguration */
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ngx_http_realip_init, /* postconfiguration */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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NULL, /* create server configuration */
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NULL, /* merge server configuration */
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ngx_http_realip_create_loc_conf, /* create location configuration */
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ngx_http_realip_merge_loc_conf /* merge location configuration */
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};
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ngx_module_t ngx_http_realip_module = {
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NGX_MODULE_V1,
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&ngx_http_realip_module_ctx, /* module context */
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ngx_http_realip_commands, /* module directives */
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NGX_HTTP_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static ngx_int_t
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ngx_http_realip_handler(ngx_http_request_t *r)
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{
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u_char *ip, *p;
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size_t len;
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in_addr_t addr;
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ngx_uint_t i, hash;
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ngx_list_part_t *part;
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ngx_table_elt_t *header;
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struct sockaddr_in *sin;
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ngx_connection_t *c;
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ngx_pool_cleanup_t *cln;
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ngx_http_realip_ctx_t *ctx;
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ngx_http_realip_from_t *from;
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ngx_http_realip_loc_conf_t *rlcf;
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ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module);
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if (ctx) {
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return NGX_DECLINED;
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}
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cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t));
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if (cln == NULL) {
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return NGX_HTTP_INTERNAL_SERVER_ERROR;
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}
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rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module);
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if (rlcf->from == NULL) {
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return NGX_DECLINED;
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}
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switch (rlcf->type) {
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case NGX_HTTP_REALIP_XREALIP:
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if (r->headers_in.x_real_ip == NULL) {
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return NGX_DECLINED;
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}
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len = r->headers_in.x_real_ip->value.len;
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ip = r->headers_in.x_real_ip->value.data;
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break;
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case NGX_HTTP_REALIP_XFWD:
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if (r->headers_in.x_forwarded_for == NULL) {
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return NGX_DECLINED;
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}
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len = r->headers_in.x_forwarded_for->value.len;
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ip = r->headers_in.x_forwarded_for->value.data;
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for (p = ip + len - 1; p > ip; p--) {
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if (*p == ' ' || *p == ',') {
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p++;
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len -= p - ip;
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ip = p;
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break;
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}
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}
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break;
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default: /* NGX_HTTP_REALIP_HEADER */
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part = &r->headers_in.headers.part;
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header = part->elts;
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hash = rlcf->hash;
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len = rlcf->header.len;
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p = rlcf->header.data;
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for (i = 0; /* void */ ; i++) {
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if (i >= part->nelts) {
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if (part->next == NULL) {
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break;
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}
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part = part->next;
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header = part->elts;
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i = 0;
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}
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if (hash == header[i].hash
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&& len == header[i].key.len
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&& ngx_strncmp(p, header[i].lowcase_key, len) == 0)
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{
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len = header[i].value.len;
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ip = header[i].value.data;
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goto found;
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}
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}
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return NGX_DECLINED;
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}
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found:
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c = r->connection;
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ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "realip: \"%s\"", ip);
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/* AF_INET only */
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if (r->connection->sockaddr->sa_family != AF_INET) {
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return NGX_DECLINED;
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}
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sin = (struct sockaddr_in *) c->sockaddr;
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from = rlcf->from->elts;
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for (i = 0; i < rlcf->from->nelts; i++) {
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ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0,
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"realip: %08XD %08XD %08XD",
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sin->sin_addr.s_addr, from[i].mask, from[i].addr);
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if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) {
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ctx = cln->data;
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ngx_http_set_ctx(r, ctx, ngx_http_realip_module);
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addr = inet_addr((char *) ip);
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if (addr == INADDR_NONE) {
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return NGX_DECLINED;
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}
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p = ngx_pnalloc(c->pool, len);
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if (p == NULL) {
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return NGX_HTTP_INTERNAL_SERVER_ERROR;
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}
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ngx_memcpy(p, ip, len);
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cln->handler = ngx_http_realip_cleanup;
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ctx->connection = c;
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ctx->addr = sin->sin_addr.s_addr;
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ctx->addr_text = c->addr_text;
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sin->sin_addr.s_addr = addr;
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c->addr_text.len = len;
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c->addr_text.data = p;
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return NGX_DECLINED;
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}
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}
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return NGX_DECLINED;
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}
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static void
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ngx_http_realip_cleanup(void *data)
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{
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ngx_http_realip_ctx_t *ctx = data;
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ngx_connection_t *c;
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struct sockaddr_in *sin;
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c = ctx->connection;
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sin = (struct sockaddr_in *) c->sockaddr;
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sin->sin_addr.s_addr = ctx->addr;
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c->addr_text = ctx->addr_text;
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}
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static char *
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ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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{
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ngx_http_realip_loc_conf_t *rlcf = conf;
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ngx_int_t rc;
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ngx_str_t *value;
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ngx_inet_cidr_t in_cidr;
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ngx_http_realip_from_t *from;
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if (rlcf->from == NULL) {
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rlcf->from = ngx_array_create(cf->pool, 2,
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sizeof(ngx_http_realip_from_t));
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if (rlcf->from == NULL) {
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return NGX_CONF_ERROR;
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}
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}
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from = ngx_array_push(rlcf->from);
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if (from == NULL) {
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return NGX_CONF_ERROR;
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}
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value = cf->args->elts;
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rc = ngx_ptocidr(&value[1], &in_cidr);
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if (rc == NGX_ERROR) {
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"",
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&value[1]);
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return NGX_CONF_ERROR;
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}
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if (rc == NGX_DONE) {
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ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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"low address bits of %V are meaningless", &value[1]);
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}
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from->mask = in_cidr.mask;
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from->addr = in_cidr.addr;
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return NGX_CONF_OK;
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}
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static char *
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ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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{
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ngx_http_realip_loc_conf_t *rlcf = conf;
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ngx_str_t *value;
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value = cf->args->elts;
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if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) {
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rlcf->type = NGX_HTTP_REALIP_XREALIP;
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return NGX_CONF_OK;
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}
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if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) {
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rlcf->type = NGX_HTTP_REALIP_XFWD;
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return NGX_CONF_OK;
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}
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rlcf->type = NGX_HTTP_REALIP_HEADER;
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rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len);
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rlcf->header = value[1];
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return NGX_CONF_OK;
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}
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static void *
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ngx_http_realip_create_loc_conf(ngx_conf_t *cf)
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{
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ngx_http_realip_loc_conf_t *conf;
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conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t));
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if (conf == NULL) {
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return NGX_CONF_ERROR;
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}
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/*
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* set by ngx_pcalloc():
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*
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* conf->from = NULL;
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* conf->hash = 0;
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* conf->header = { 0, NULL };
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*/
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conf->type = NGX_CONF_UNSET_UINT;
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return conf;
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}
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static char *
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ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
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{
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ngx_http_realip_loc_conf_t *prev = parent;
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ngx_http_realip_loc_conf_t *conf = child;
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if (conf->from == NULL) {
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conf->from = prev->from;
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}
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ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP);
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if (conf->header.len == 0) {
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conf->hash = prev->hash;
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conf->header = prev->header;
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}
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return NGX_CONF_OK;
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}
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static ngx_int_t
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ngx_http_realip_init(ngx_conf_t *cf)
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{
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ngx_http_handler_pt *h;
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ngx_http_core_main_conf_t *cmcf;
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cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers);
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if (h == NULL) {
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return NGX_ERROR;
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}
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*h = ngx_http_realip_handler;
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h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
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if (h == NULL) {
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return NGX_ERROR;
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}
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*h = ngx_http_realip_handler;
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return NGX_OK;
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}
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