ngx_http_flv_module.c revision e18a033b
1
2/*
3 * Copyright (C) Igor Sysoev
4 * Copyright (C) Nginx, Inc.
5 */
6
7#include <ngx_config.h>
8#include <ngx_core.h>
9#include <ngx_http.h>
10
11
12static char *ngx_http_flv(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
13
14static ngx_command_t  ngx_http_flv_commands[] = {
15
16    { ngx_string("flv"),
17      NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
18      ngx_http_flv,
19      0,
20      0,
21      NULL },
22
23      ngx_null_command
24};
25
26
27static u_char  ngx_flv_header[] = "FLV\x1\x5\0\0\0\x9\0\0\0\0";
28
29
30static ngx_http_module_t  ngx_http_flv_module_ctx = {
31    NULL,                          /* preconfiguration */
32    NULL,                          /* postconfiguration */
33
34    NULL,                          /* create main configuration */
35    NULL,                          /* init main configuration */
36
37    NULL,                          /* create server configuration */
38    NULL,                          /* merge server configuration */
39
40    NULL,                          /* create location configuration */
41    NULL                           /* merge location configuration */
42};
43
44
45ngx_module_t  ngx_http_flv_module = {
46    NGX_MODULE_V1,
47    &ngx_http_flv_module_ctx,      /* module context */
48    ngx_http_flv_commands,         /* module directives */
49    NGX_HTTP_MODULE,               /* module type */
50    NULL,                          /* init master */
51    NULL,                          /* init module */
52    NULL,                          /* init process */
53    NULL,                          /* init thread */
54    NULL,                          /* exit thread */
55    NULL,                          /* exit process */
56    NULL,                          /* exit master */
57    NGX_MODULE_V1_PADDING
58};
59
60
61static ngx_int_t
62ngx_http_flv_handler(ngx_http_request_t *r)
63{
64    u_char                    *last;
65    off_t                      start, len;
66    size_t                     root;
67    ngx_int_t                  rc;
68    ngx_uint_t                 level, i;
69    ngx_str_t                  path, value;
70    ngx_log_t                 *log;
71    ngx_buf_t                 *b;
72    ngx_chain_t                out[2];
73    ngx_open_file_info_t       of;
74    ngx_http_core_loc_conf_t  *clcf;
75
76    if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD))) {
77        return NGX_HTTP_NOT_ALLOWED;
78    }
79
80    if (r->uri.data[r->uri.len - 1] == '/') {
81        return NGX_DECLINED;
82    }
83
84    rc = ngx_http_discard_request_body(r);
85
86    if (rc != NGX_OK) {
87        return rc;
88    }
89
90    last = ngx_http_map_uri_to_path(r, &path, &root, 0);
91    if (last == NULL) {
92        return NGX_HTTP_INTERNAL_SERVER_ERROR;
93    }
94
95    log = r->connection->log;
96
97    path.len = last - path.data;
98
99    ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
100                   "http flv filename: \"%V\"", &path);
101
102    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
103
104    ngx_memzero(&of, sizeof(ngx_open_file_info_t));
105
106    of.read_ahead = clcf->read_ahead;
107    of.directio = clcf->directio;
108    of.valid = clcf->open_file_cache_valid;
109    of.min_uses = clcf->open_file_cache_min_uses;
110    of.errors = clcf->open_file_cache_errors;
111    of.events = clcf->open_file_cache_events;
112
113    if (ngx_http_set_disable_symlinks(r, clcf, &path, &of) != NGX_OK) {
114        return NGX_HTTP_INTERNAL_SERVER_ERROR;
115    }
116
117    if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool)
118        != NGX_OK)
119    {
120        switch (of.err) {
121
122        case 0:
123            return NGX_HTTP_INTERNAL_SERVER_ERROR;
124
125        case NGX_ENOENT:
126        case NGX_ENOTDIR:
127        case NGX_ENAMETOOLONG:
128
129            level = NGX_LOG_ERR;
130            rc = NGX_HTTP_NOT_FOUND;
131            break;
132
133        case NGX_EACCES:
134#if (NGX_HAVE_OPENAT)
135        case NGX_EMLINK:
136        case NGX_ELOOP:
137#endif
138
139            level = NGX_LOG_ERR;
140            rc = NGX_HTTP_FORBIDDEN;
141            break;
142
143        default:
144
145            level = NGX_LOG_CRIT;
146            rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
147            break;
148        }
149
150        if (rc != NGX_HTTP_NOT_FOUND || clcf->log_not_found) {
151            ngx_log_error(level, log, of.err,
152                          "%s \"%s\" failed", of.failed, path.data);
153        }
154
155        return rc;
156    }
157
158    if (!of.is_file) {
159
160        if (ngx_close_file(of.fd) == NGX_FILE_ERROR) {
161            ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
162                          ngx_close_file_n " \"%s\" failed", path.data);
163        }
164
165        return NGX_DECLINED;
166    }
167
168    r->root_tested = !r->error_page;
169
170    start = 0;
171    len = of.size;
172    i = 1;
173
174    if (r->args.len) {
175
176        if (ngx_http_arg(r, (u_char *) "start", 5, &value) == NGX_OK) {
177
178            start = ngx_atoof(value.data, value.len);
179
180            if (start == NGX_ERROR || start >= len) {
181                start = 0;
182            }
183
184            if (start) {
185                len = sizeof(ngx_flv_header) - 1 + len - start;
186                i = 0;
187            }
188        }
189    }
190
191    log->action = "sending flv to client";
192
193    r->headers_out.status = NGX_HTTP_OK;
194    r->headers_out.content_length_n = len;
195    r->headers_out.last_modified_time = of.mtime;
196
197    if (ngx_http_set_etag(r) != NGX_OK) {
198        return NGX_HTTP_INTERNAL_SERVER_ERROR;
199    }
200
201    if (ngx_http_set_content_type(r) != NGX_OK) {
202        return NGX_HTTP_INTERNAL_SERVER_ERROR;
203    }
204
205    if (i == 0) {
206        b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
207        if (b == NULL) {
208            return NGX_HTTP_INTERNAL_SERVER_ERROR;
209        }
210
211        b->pos = ngx_flv_header;
212        b->last = ngx_flv_header + sizeof(ngx_flv_header) - 1;
213        b->memory = 1;
214
215        out[0].buf = b;
216        out[0].next = &out[1];
217    }
218
219
220    b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
221    if (b == NULL) {
222        return NGX_HTTP_INTERNAL_SERVER_ERROR;
223    }
224
225    b->file = ngx_pcalloc(r->pool, sizeof(ngx_file_t));
226    if (b->file == NULL) {
227        return NGX_HTTP_INTERNAL_SERVER_ERROR;
228    }
229
230    r->allow_ranges = 1;
231
232    rc = ngx_http_send_header(r);
233
234    if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
235        return rc;
236    }
237
238    b->file_pos = start;
239    b->file_last = of.size;
240
241    b->in_file = b->file_last ? 1: 0;
242    b->last_buf = (r == r->main) ? 1 : 0;
243    b->last_in_chain = 1;
244
245    b->file->fd = of.fd;
246    b->file->name = path;
247    b->file->log = log;
248    b->file->directio = of.is_directio;
249
250    out[1].buf = b;
251    out[1].next = NULL;
252
253    return ngx_http_output_filter(r, &out[i]);
254}
255
256
257static char *
258ngx_http_flv(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
259{
260    ngx_http_core_loc_conf_t  *clcf;
261
262    clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
263    clcf->handler = ngx_http_flv_handler;
264
265    return NGX_CONF_OK;
266}
267