270 lines
6.4 KiB
C
270 lines
6.4 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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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_mail.h>
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typedef struct {
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ngx_array_t *from; /* array of ngx_cidr_t */
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} ngx_mail_realip_srv_conf_t;
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static ngx_int_t ngx_mail_realip_set_addr(ngx_mail_session_t *s,
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ngx_addr_t *addr);
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static char *ngx_mail_realip_from(ngx_conf_t *cf, ngx_command_t *cmd,
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void *conf);
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static void *ngx_mail_realip_create_srv_conf(ngx_conf_t *cf);
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static char *ngx_mail_realip_merge_srv_conf(ngx_conf_t *cf, void *parent,
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void *child);
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static ngx_command_t ngx_mail_realip_commands[] = {
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{ ngx_string("set_real_ip_from"),
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NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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ngx_mail_realip_from,
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NGX_MAIL_SRV_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_mail_module_t ngx_mail_realip_module_ctx = {
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NULL, /* protocol */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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ngx_mail_realip_create_srv_conf, /* create server configuration */
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ngx_mail_realip_merge_srv_conf /* merge server configuration */
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};
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ngx_module_t ngx_mail_realip_module = {
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NGX_MODULE_V1,
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&ngx_mail_realip_module_ctx, /* module context */
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ngx_mail_realip_commands, /* module directives */
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NGX_MAIL_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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ngx_int_t
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ngx_mail_realip_handler(ngx_mail_session_t *s)
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{
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ngx_addr_t addr;
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ngx_connection_t *c;
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ngx_mail_realip_srv_conf_t *rscf;
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rscf = ngx_mail_get_module_srv_conf(s, ngx_mail_realip_module);
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if (rscf->from == NULL) {
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return NGX_OK;
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}
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c = s->connection;
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if (c->proxy_protocol == NULL) {
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return NGX_OK;
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}
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if (ngx_cidr_match(c->sockaddr, rscf->from) != NGX_OK) {
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return NGX_OK;
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}
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if (ngx_parse_addr(c->pool, &addr, c->proxy_protocol->src_addr.data,
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c->proxy_protocol->src_addr.len)
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!= NGX_OK)
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{
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return NGX_OK;
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}
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ngx_inet_set_port(addr.sockaddr, c->proxy_protocol->src_port);
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return ngx_mail_realip_set_addr(s, &addr);
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}
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static ngx_int_t
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ngx_mail_realip_set_addr(ngx_mail_session_t *s, ngx_addr_t *addr)
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{
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size_t len;
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u_char *p;
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u_char text[NGX_SOCKADDR_STRLEN];
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ngx_connection_t *c;
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c = s->connection;
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len = ngx_sock_ntop(addr->sockaddr, addr->socklen, text,
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NGX_SOCKADDR_STRLEN, 0);
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if (len == 0) {
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return NGX_ERROR;
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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_ERROR;
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}
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ngx_memcpy(p, text, len);
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c->sockaddr = addr->sockaddr;
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c->socklen = addr->socklen;
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c->addr_text.len = len;
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c->addr_text.data = p;
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return NGX_OK;
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}
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static char *
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ngx_mail_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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{
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ngx_mail_realip_srv_conf_t *rscf = conf;
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ngx_int_t rc;
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ngx_str_t *value;
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ngx_url_t u;
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ngx_cidr_t c, *cidr;
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ngx_uint_t i;
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struct sockaddr_in *sin;
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#if (NGX_HAVE_INET6)
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struct sockaddr_in6 *sin6;
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#endif
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value = cf->args->elts;
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if (rscf->from == NULL) {
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rscf->from = ngx_array_create(cf->pool, 2,
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sizeof(ngx_cidr_t));
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if (rscf->from == NULL) {
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return NGX_CONF_ERROR;
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}
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}
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#if (NGX_HAVE_UNIX_DOMAIN)
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if (ngx_strcmp(value[1].data, "unix:") == 0) {
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cidr = ngx_array_push(rscf->from);
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if (cidr == NULL) {
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return NGX_CONF_ERROR;
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}
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cidr->family = AF_UNIX;
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return NGX_CONF_OK;
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}
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#endif
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rc = ngx_ptocidr(&value[1], &c);
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if (rc != NGX_ERROR) {
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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",
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&value[1]);
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}
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cidr = ngx_array_push(rscf->from);
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if (cidr == NULL) {
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return NGX_CONF_ERROR;
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}
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*cidr = c;
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return NGX_CONF_OK;
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}
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ngx_memzero(&u, sizeof(ngx_url_t));
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u.host = value[1];
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if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) {
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if (u.err) {
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ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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"%s in set_real_ip_from \"%V\"",
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u.err, &u.host);
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}
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return NGX_CONF_ERROR;
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}
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cidr = ngx_array_push_n(rscf->from, u.naddrs);
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if (cidr == NULL) {
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return NGX_CONF_ERROR;
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}
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ngx_memzero(cidr, u.naddrs * sizeof(ngx_cidr_t));
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for (i = 0; i < u.naddrs; i++) {
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cidr[i].family = u.addrs[i].sockaddr->sa_family;
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switch (cidr[i].family) {
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#if (NGX_HAVE_INET6)
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case AF_INET6:
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sin6 = (struct sockaddr_in6 *) u.addrs[i].sockaddr;
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cidr[i].u.in6.addr = sin6->sin6_addr;
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ngx_memset(cidr[i].u.in6.mask.s6_addr, 0xff, 16);
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break;
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#endif
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default: /* AF_INET */
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sin = (struct sockaddr_in *) u.addrs[i].sockaddr;
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cidr[i].u.in.addr = sin->sin_addr.s_addr;
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cidr[i].u.in.mask = 0xffffffff;
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break;
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}
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}
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return NGX_CONF_OK;
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}
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static void *
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ngx_mail_realip_create_srv_conf(ngx_conf_t *cf)
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{
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ngx_mail_realip_srv_conf_t *conf;
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conf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_realip_srv_conf_t));
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if (conf == NULL) {
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return NULL;
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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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*/
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return conf;
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}
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static char *
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ngx_mail_realip_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
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{
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ngx_mail_realip_srv_conf_t *prev = parent;
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ngx_mail_realip_srv_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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return NGX_CONF_OK;
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}
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