| |
| /* |
| * Copyright (C) Igor Sysoev |
| * Copyright (C) Nginx, Inc. |
| */ |
| |
| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_mail.h> |
| |
| |
| typedef struct { |
| ngx_array_t *from; /* array of ngx_cidr_t */ |
| } ngx_mail_realip_srv_conf_t; |
| |
| |
| static ngx_int_t ngx_mail_realip_set_addr(ngx_mail_session_t *s, |
| ngx_addr_t *addr); |
| static char *ngx_mail_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, |
| void *conf); |
| static void *ngx_mail_realip_create_srv_conf(ngx_conf_t *cf); |
| static char *ngx_mail_realip_merge_srv_conf(ngx_conf_t *cf, void *parent, |
| void *child); |
| |
| |
| static ngx_command_t ngx_mail_realip_commands[] = { |
| |
| { ngx_string("set_real_ip_from"), |
| NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, |
| ngx_mail_realip_from, |
| NGX_MAIL_SRV_CONF_OFFSET, |
| 0, |
| NULL }, |
| |
| ngx_null_command |
| }; |
| |
| |
| static ngx_mail_module_t ngx_mail_realip_module_ctx = { |
| NULL, /* protocol */ |
| |
| NULL, /* create main configuration */ |
| NULL, /* init main configuration */ |
| |
| ngx_mail_realip_create_srv_conf, /* create server configuration */ |
| ngx_mail_realip_merge_srv_conf /* merge server configuration */ |
| }; |
| |
| |
| ngx_module_t ngx_mail_realip_module = { |
| NGX_MODULE_V1, |
| &ngx_mail_realip_module_ctx, /* module context */ |
| ngx_mail_realip_commands, /* module directives */ |
| NGX_MAIL_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 |
| }; |
| |
| |
| ngx_int_t |
| ngx_mail_realip_handler(ngx_mail_session_t *s) |
| { |
| ngx_addr_t addr; |
| ngx_connection_t *c; |
| ngx_mail_realip_srv_conf_t *rscf; |
| |
| rscf = ngx_mail_get_module_srv_conf(s, ngx_mail_realip_module); |
| |
| if (rscf->from == NULL) { |
| return NGX_OK; |
| } |
| |
| c = s->connection; |
| |
| if (c->proxy_protocol == NULL) { |
| return NGX_OK; |
| } |
| |
| if (ngx_cidr_match(c->sockaddr, rscf->from) != NGX_OK) { |
| return NGX_OK; |
| } |
| |
| if (ngx_parse_addr(c->pool, &addr, c->proxy_protocol->src_addr.data, |
| c->proxy_protocol->src_addr.len) |
| != NGX_OK) |
| { |
| return NGX_OK; |
| } |
| |
| ngx_inet_set_port(addr.sockaddr, c->proxy_protocol->src_port); |
| |
| return ngx_mail_realip_set_addr(s, &addr); |
| } |
| |
| |
| static ngx_int_t |
| ngx_mail_realip_set_addr(ngx_mail_session_t *s, ngx_addr_t *addr) |
| { |
| size_t len; |
| u_char *p; |
| u_char text[NGX_SOCKADDR_STRLEN]; |
| ngx_connection_t *c; |
| |
| c = s->connection; |
| |
| len = ngx_sock_ntop(addr->sockaddr, addr->socklen, text, |
| NGX_SOCKADDR_STRLEN, 0); |
| if (len == 0) { |
| return NGX_ERROR; |
| } |
| |
| p = ngx_pnalloc(c->pool, len); |
| if (p == NULL) { |
| return NGX_ERROR; |
| } |
| |
| ngx_memcpy(p, text, len); |
| |
| c->sockaddr = addr->sockaddr; |
| c->socklen = addr->socklen; |
| c->addr_text.len = len; |
| c->addr_text.data = p; |
| |
| return NGX_OK; |
| } |
| |
| |
| static char * |
| ngx_mail_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| { |
| ngx_mail_realip_srv_conf_t *rscf = 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 (rscf->from == NULL) { |
| rscf->from = ngx_array_create(cf->pool, 2, |
| sizeof(ngx_cidr_t)); |
| if (rscf->from == NULL) { |
| return NGX_CONF_ERROR; |
| } |
| } |
| |
| #if (NGX_HAVE_UNIX_DOMAIN) |
| |
| if (ngx_strcmp(value[1].data, "unix:") == 0) { |
| cidr = ngx_array_push(rscf->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(rscf->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(rscf->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 void * |
| ngx_mail_realip_create_srv_conf(ngx_conf_t *cf) |
| { |
| ngx_mail_realip_srv_conf_t *conf; |
| |
| conf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_realip_srv_conf_t)); |
| if (conf == NULL) { |
| return NULL; |
| } |
| |
| /* |
| * set by ngx_pcalloc(): |
| * |
| * conf->from = NULL; |
| */ |
| |
| return conf; |
| } |
| |
| |
| static char * |
| ngx_mail_realip_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child) |
| { |
| ngx_mail_realip_srv_conf_t *prev = parent; |
| ngx_mail_realip_srv_conf_t *conf = child; |
| |
| if (conf->from == NULL) { |
| conf->from = prev->from; |
| } |
| |
| return NGX_CONF_OK; |
| } |