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/*
* Copyright (c) 2012 Roman Arutyunyan
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include "ngx_rtmp.h"
#include "ngx_rtmp_cmd_module.h"
static ngx_rtmp_publish_pt next_publish;
static ngx_rtmp_play_pt next_play;
#define NGX_RTMP_ACCESS_PUBLISH 0x01
#define NGX_RTMP_ACCESS_PLAY 0x02
static char * ngx_rtmp_access_rule(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_int_t ngx_rtmp_access_postconfiguration(ngx_conf_t *cf);
static void * ngx_rtmp_access_create_app_conf(ngx_conf_t *cf);
static char * ngx_rtmp_access_merge_app_conf(ngx_conf_t *cf,
void *parent, void *child);
typedef struct {
in_addr_t mask;
in_addr_t addr;
ngx_uint_t deny;
ngx_uint_t flags;
} ngx_rtmp_access_rule_t;
#if (NGX_HAVE_INET6)
typedef struct {
struct in6_addr addr;
struct in6_addr mask;
ngx_uint_t deny;
ngx_uint_t flags;
} ngx_rtmp_access_rule6_t;
#endif
typedef struct {
ngx_array_t rules; /* array of ngx_rtmp_access_rule_t */
#if (NGX_HAVE_INET6)
ngx_array_t rules6; /* array of ngx_rtmp_access_rule6_t */
#endif
} ngx_rtmp_access_app_conf_t;
static ngx_command_t ngx_rtmp_access_commands[] = {
{ ngx_string("allow"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_TAKE12,
ngx_rtmp_access_rule,
NGX_RTMP_APP_CONF_OFFSET,
0,
NULL },
{ ngx_string("deny"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_TAKE12,
ngx_rtmp_access_rule,
NGX_RTMP_APP_CONF_OFFSET,
0,
NULL },
ngx_null_command
};
static ngx_rtmp_module_t ngx_rtmp_access_module_ctx = {
NULL, /* preconfiguration */
ngx_rtmp_access_postconfiguration, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_rtmp_access_create_app_conf, /* create app configuration */
ngx_rtmp_access_merge_app_conf, /* merge app configuration */
};
ngx_module_t ngx_rtmp_access_module = {
NGX_MODULE_V1,
&ngx_rtmp_access_module_ctx, /* module context */
ngx_rtmp_access_commands, /* module directives */
NGX_RTMP_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 void *
ngx_rtmp_access_create_app_conf(ngx_conf_t *cf)
{
ngx_rtmp_access_app_conf_t *aacf;
aacf = ngx_pcalloc(cf->pool, sizeof(ngx_rtmp_access_app_conf_t));
if (aacf == NULL) {
return NULL;
}
if (ngx_array_init(&aacf->rules, cf->pool, 1,
sizeof(ngx_rtmp_access_rule_t))
!= NGX_OK)
{
return NULL;
}
#if (NGX_HAVE_INET6)
if (ngx_array_init(&aacf->rules6, cf->pool, 1,
sizeof(ngx_rtmp_access_rule6_t))
!= NGX_OK)
{
return NULL;
}
#endif
return aacf;
}
static ngx_int_t
ngx_rtmp_access_merge_rules(ngx_array_t *prev, ngx_array_t *rules)
{
void *p;
if (prev->nelts == 0) {
return NGX_OK;
}
if (rules->nelts == 0) {
*rules = *prev;
return NGX_OK;
}
p = ngx_array_push_n(rules, prev->nelts);
if (p == NULL) {
return NGX_ERROR;
}
ngx_memcpy(p, prev->elts, prev->size * prev->nelts);
return NGX_OK;
}
static char *
ngx_rtmp_access_merge_app_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_rtmp_access_app_conf_t *prev = parent;
ngx_rtmp_access_app_conf_t *conf = child;
if (ngx_rtmp_access_merge_rules(&prev->rules, &conf->rules) != NGX_OK) {
return NGX_CONF_ERROR;
}
#if (NGX_HAVE_INET6)
if (ngx_rtmp_access_merge_rules(&prev->rules6, &conf->rules6) != NGX_OK) {
return NGX_CONF_ERROR;
}
#endif
return NGX_CONF_OK;
}
static ngx_int_t
ngx_rtmp_access_found(ngx_rtmp_session_t *s, ngx_uint_t deny)
{
if (deny) {
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
"access forbidden by rule");
return NGX_ERROR;
}
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_access_inet(ngx_rtmp_session_t *s, in_addr_t addr, ngx_uint_t flag)
{
ngx_uint_t i;
ngx_rtmp_access_rule_t *rule;
ngx_rtmp_access_app_conf_t *ascf;
ascf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_access_module);
rule = ascf->rules.elts;
for (i = 0; i < ascf->rules.nelts; i++) {
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, s->connection->log, 0,
"access: %08XD %08XD %08XD",
addr, rule[i].mask, rule[i].addr);
if ((addr & rule[i].mask) == rule[i].addr && (flag & rule[i].flags)) {
return ngx_rtmp_access_found(s, rule[i].deny);
}
}
return NGX_OK;
}
#if (NGX_HAVE_INET6)
static ngx_int_t
ngx_rtmp_access_inet6(ngx_rtmp_session_t *s, u_char *p, ngx_uint_t flag)
{
ngx_uint_t n;
ngx_uint_t i;
ngx_rtmp_access_rule6_t *rule6;
ngx_rtmp_access_app_conf_t *ascf;
ascf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_access_module);
rule6 = ascf->rules6.elts;
for (i = 0; i < ascf->rules6.nelts; i++) {
#if (NGX_DEBUG)
{
size_t cl, ml, al;
u_char ct[NGX_INET6_ADDRSTRLEN];
u_char mt[NGX_INET6_ADDRSTRLEN];
u_char at[NGX_INET6_ADDRSTRLEN];
cl = ngx_inet6_ntop(p, ct, NGX_INET6_ADDRSTRLEN);
ml = ngx_inet6_ntop(rule6[i].mask.s6_addr, mt, NGX_INET6_ADDRSTRLEN);
al = ngx_inet6_ntop(rule6[i].addr.s6_addr, at, NGX_INET6_ADDRSTRLEN);
ngx_log_debug6(NGX_LOG_DEBUG_HTTP, s->connection->log, 0,
"access: %*s %*s %*s", cl, ct, ml, mt, al, at);
}
#endif
for (n = 0; n < 16; n++) {
if ((p[n] & rule6[i].mask.s6_addr[n]) != rule6[i].addr.s6_addr[n]) {
goto next;
}
}
if (flag & rule6[i].flags) {
return ngx_rtmp_access_found(s, rule6[i].deny);
}
next:
continue;
}
return NGX_OK;
}
#endif
static ngx_int_t
ngx_rtmp_access(ngx_rtmp_session_t *s, ngx_uint_t flag)
{
struct sockaddr_in *sin;
ngx_rtmp_access_app_conf_t *ascf;
#if (NGX_HAVE_INET6)
u_char *p;
in_addr_t addr;
struct sockaddr_in6 *sin6;
#endif
ascf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_access_module);
if (ascf == NULL) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, s->connection->log, 0,
"access: NULL app conf");
return NGX_ERROR;
}
/* relay etc */
if (s->connection->sockaddr == NULL) {
return NGX_OK;
}
switch (s->connection->sockaddr->sa_family) {
case AF_INET:
sin = (struct sockaddr_in *) s->connection->sockaddr;
return ngx_rtmp_access_inet(s, sin->sin_addr.s_addr, flag);
#if (NGX_HAVE_INET6)
case AF_INET6:
sin6 = (struct sockaddr_in6 *) s->connection->sockaddr;
p = sin6->sin6_addr.s6_addr;
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
addr = p[12] << 24;
addr += p[13] << 16;
addr += p[14] << 8;
addr += p[15];
return ngx_rtmp_access_inet(s, htonl(addr), flag);
}
return ngx_rtmp_access_inet6(s, p, flag);
#endif
}
return NGX_OK;
}
static char *
ngx_rtmp_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_rtmp_access_app_conf_t *ascf = conf;
ngx_int_t rc;
ngx_uint_t all;
ngx_str_t *value;
ngx_cidr_t cidr;
ngx_rtmp_access_rule_t *rule;
#if (NGX_HAVE_INET6)
ngx_rtmp_access_rule6_t *rule6;
#endif
size_t n;
ngx_uint_t flags;
ngx_memzero(&cidr, sizeof(ngx_cidr_t));
value = cf->args->elts;
n = 1;
flags = 0;
if (cf->args->nelts == 2) {
flags = NGX_RTMP_ACCESS_PUBLISH | NGX_RTMP_ACCESS_PLAY;
} else {
for(; n < cf->args->nelts - 1; ++n) {
if (value[n].len == sizeof("publish") - 1 &&
ngx_strcmp(value[1].data, "publish") == 0)
{
flags |= NGX_RTMP_ACCESS_PUBLISH;
continue;
}
if (value[n].len == sizeof("play") - 1 &&
ngx_strcmp(value[1].data, "play") == 0)
{
flags |= NGX_RTMP_ACCESS_PLAY;
continue;
}
ngx_log_error(NGX_LOG_ERR, cf->log, 0,
"unexpected access specified: '%V'", &value[n]);
return NGX_CONF_ERROR;
}
}
all = (value[n].len == 3 && ngx_strcmp(value[n].data, "all") == 0);
if (!all) {
rc = ngx_ptocidr(&value[n], &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]);
}
}
switch (cidr.family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
case 0: /* all */
rule6 = ngx_array_push(&ascf->rules6);
if (rule6 == NULL) {
return NGX_CONF_ERROR;
}
rule6->mask = cidr.u.in6.mask;
rule6->addr = cidr.u.in6.addr;
rule6->deny = (value[0].data[0] == 'd') ? 1 : 0;
rule6->flags = flags;
if (!all) {
break;
}
/* "all" passes through */
#endif
default: /* AF_INET */
rule = ngx_array_push(&ascf->rules);
if (rule == NULL) {
return NGX_CONF_ERROR;
}
rule->mask = cidr.u.in.mask;
rule->addr = cidr.u.in.addr;
rule->deny = (value[0].data[0] == 'd') ? 1 : 0;
rule->flags = flags;
}
return NGX_CONF_OK;
}
static ngx_int_t
ngx_rtmp_access_publish(ngx_rtmp_session_t *s, ngx_rtmp_publish_t *v)
{
if (s->auto_pushed) {
goto next;
}
if (ngx_rtmp_access(s, NGX_RTMP_ACCESS_PUBLISH) != NGX_OK) {
return NGX_ERROR;
}
next:
return next_publish(s, v);
}
static ngx_int_t
ngx_rtmp_access_play(ngx_rtmp_session_t *s, ngx_rtmp_play_t *v)
{
if (ngx_rtmp_access(s, NGX_RTMP_ACCESS_PLAY) != NGX_OK) {
return NGX_ERROR;
}
return next_play(s, v);
}
static ngx_int_t
ngx_rtmp_access_postconfiguration(ngx_conf_t *cf)
{
/* chain handlers */
next_publish = ngx_rtmp_publish;
ngx_rtmp_publish = ngx_rtmp_access_publish;
next_play = ngx_rtmp_play;
ngx_rtmp_play = ngx_rtmp_access_play;
return NGX_OK;
}
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