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ngx_rtmp_eval.c
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ngx_rtmp_eval.c
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/*
* Copyright (C) Roman Arutyunyan
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include "ngx_rtmp_eval.h"
#define NGX_RTMP_EVAL_BUFLEN 16
static void
ngx_rtmp_eval_session_str(void *ctx, ngx_rtmp_eval_t *e, ngx_str_t *ret)
{
*ret = *(ngx_str_t *) ((u_char *) ctx + e->offset);
}
static void
ngx_rtmp_eval_connection_str(void *ctx, ngx_rtmp_eval_t *e, ngx_str_t *ret)
{
ngx_rtmp_session_t *s = ctx;
*ret = *(ngx_str_t *) ((u_char *) s->connection + e->offset);
}
ngx_rtmp_eval_t ngx_rtmp_eval_session[] = {
{ ngx_string("app"),
ngx_rtmp_eval_session_str,
offsetof(ngx_rtmp_session_t, app) },
{ ngx_string("flashver"),
ngx_rtmp_eval_session_str,
offsetof(ngx_rtmp_session_t, flashver) },
{ ngx_string("swfurl"),
ngx_rtmp_eval_session_str,
offsetof(ngx_rtmp_session_t, swf_url) },
{ ngx_string("tcurl"),
ngx_rtmp_eval_session_str,
offsetof(ngx_rtmp_session_t, tc_url) },
{ ngx_string("pageurl"),
ngx_rtmp_eval_session_str,
offsetof(ngx_rtmp_session_t, page_url) },
{ ngx_string("addr"),
ngx_rtmp_eval_connection_str,
offsetof(ngx_connection_t, addr_text) },
ngx_rtmp_null_eval
};
static void
ngx_rtmp_eval_append(ngx_buf_t *b, void *data, size_t len, ngx_log_t *log)
{
size_t buf_len;
if (b->last + len > b->end) {
buf_len = 2 * (b->last - b->pos) + len;
b->start = ngx_alloc(buf_len, log);
if (b->start == NULL) {
return;
}
b->last = ngx_cpymem(b->start, b->pos, b->last - b->pos);
b->pos = b->start;
b->end = b->start + buf_len;
}
b->last = ngx_cpymem(b->last, data, len);
}
static void
ngx_rtmp_eval_append_var(void *ctx, ngx_buf_t *b, ngx_rtmp_eval_t **e,
ngx_str_t *name, ngx_log_t *log)
{
ngx_uint_t k;
ngx_str_t v;
ngx_rtmp_eval_t *ee;
for (; *e; ++e) {
for (k = 0, ee = *e; ee->handler; ++k, ++ee) {
if (ee->name.len == name->len &&
ngx_memcmp(ee->name.data, name->data, name->len) == 0)
{
ee->handler(ctx, ee, &v);
ngx_rtmp_eval_append(b, v.data, v.len, log);
}
}
}
}
ngx_int_t
ngx_rtmp_eval(void *ctx, ngx_str_t *in, ngx_rtmp_eval_t **e, ngx_str_t *out,
ngx_log_t *log)
{
u_char c, *p;
ngx_str_t name;
ngx_buf_t b;
ngx_uint_t n;
enum {
NORMAL,
ESCAPE,
NAME,
SNAME
} state = NORMAL;
b.pos = b.last = b.start = ngx_alloc(NGX_RTMP_EVAL_BUFLEN, log);
if (b.pos == NULL) {
return NGX_ERROR;
}
b.end = b.pos + NGX_RTMP_EVAL_BUFLEN;
name.data = NULL;
for (n = 0; n < in->len; ++n) {
p = &in->data[n];
c = *p;
switch (state) {
case SNAME:
if (c != '}') {
continue;
}
name.len = p - name.data;
ngx_rtmp_eval_append_var(ctx, &b, e, &name, log);
state = NORMAL;
continue;
case NAME:
if (c == '{' && name.data == p) {
++name.data;
state = SNAME;
continue;
}
if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
continue;
}
name.len = p - name.data;
ngx_rtmp_eval_append_var(ctx, &b, e, &name, log);
/* fall through */
case NORMAL:
switch (c) {
case '$':
name.data = p + 1;
state = NAME;
continue;
case '\\':
state = ESCAPE;
continue;
default:
break;
}
/* fall through */
case ESCAPE:
ngx_rtmp_eval_append(&b, &c, 1, log);
state = NORMAL;
break;
}
}
if (state == NAME) {
p = &in->data[n];
name.len = p - name.data;
ngx_rtmp_eval_append_var(ctx, &b, e, &name, log);
}
c = 0;
ngx_rtmp_eval_append(&b, &c, 1, log);
out->data = b.pos;
out->len = b.last - b.pos - 1;
return NGX_OK;
}
ngx_int_t
ngx_rtmp_eval_streams(ngx_str_t *in)
{
#if !(NGX_WIN32)
ngx_int_t mode, create, v, close_src;
ngx_fd_t dst, src;
u_char *path;
path = in->data;
while (*path >= '0' && *path <= '9') {
path++;
}
switch ((char) *path) {
case '>':
v = (path == in->data ? 1 : ngx_atoi(in->data, path - in->data));
if (v == NGX_ERROR) {
return NGX_ERROR;
}
dst = (ngx_fd_t) v;
mode = NGX_FILE_WRONLY;
create = NGX_FILE_TRUNCATE;
path++;
if (*path == (u_char) '>') {
mode = NGX_FILE_APPEND;
create = NGX_FILE_CREATE_OR_OPEN;
path++;
}
break;
case '<':
v = (path == in->data ? 0 : ngx_atoi(in->data, path - in->data));
if (v == NGX_ERROR) {
return NGX_ERROR;
}
dst = (ngx_fd_t) v;
mode = NGX_FILE_RDONLY;
create = NGX_FILE_OPEN;
path++;
break;
default:
return NGX_DONE;
}
if (*path == (u_char) '&') {
path++;
v = ngx_atoi(path, in->data + in->len - path);
if (v == NGX_ERROR) {
return NGX_ERROR;
}
src = (ngx_fd_t) v;
close_src = 0;
} else {
src = ngx_open_file(path, mode, create, NGX_FILE_DEFAULT_ACCESS);
if (src == NGX_INVALID_FILE) {
return NGX_ERROR;
}
close_src = 1;
}
if (src == dst) {
return NGX_OK;
}
dup2(src, dst);
if (close_src) {
ngx_close_file(src);
}
return NGX_OK;
#else
return NGX_DONE;
#endif
}