uhttpd.h

   1 /*
   2  * uhttpd - Tiny single-threaded httpd
   3  *
   4  *   Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
   5  *   Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 #ifndef __UHTTPD_H
  21 #define __UHTTPD_H
  22
  23 #include <netinet/in.h>
  24 #include <limits.h>
  25 #include <dirent.h>
  26
  27 #include <libubox/list.h>
  28 #include <libubox/uloop.h>
  29 #include <libubox/ustream.h>
  30 #include <libubox/blob.h>
  31 #include <libubox/utils.h>
  32 #ifdef HAVE_UBUS
  33 #include <libubus.h>
  34 #include <json-c/json.h>
  35 #endif
  36 #ifdef HAVE_TLS
  37 #include <libubox/ustream-ssl.h>
  38 #endif
  39
  40 #include "utils.h"
  41
  42 #define UH_LIMIT_CLIENTS        64
  43
  44 #define __enum_header(_name, _val) HDR_##_name,
  45 #define __blobmsg_header(_name, _val) [HDR_##_name] = { .name = #_val, .type = BLOBMSG_TYPE_STRING },
  46
  47 struct client;
  48
  49 struct alias {
  50         struct list_head list;
  51         char *alias;
  52         char *path;
  53 };
  54
  55 struct config {
  56         const char *docroot;
  57         const char *realm;
  58         const char *file;
  59         const char *error_handler;
  60         const char *cgi_prefix;
  61         const char *cgi_docroot_path;
  62         const char *cgi_path;
  63         const char *lua_handler;
  64         const char *lua_prefix;
  65         const char *ubus_prefix;
  66         const char *ubus_socket;
  67         int no_symlinks;
  68         int no_dirlists;
  69         int network_timeout;
  70         int rfc1918_filter;
  71         int tls_redirect;
  72         int tcp_keepalive;
  73         int max_script_requests;
  74         int max_connections;
  75         int http_keepalive;
  76         int script_timeout;
  77         int ubus_noauth;
  78         int ubus_cors;
  79         int cgi_prefix_len;
  80         struct list_head cgi_alias;
  81 };
  82
  83 struct auth_realm {
  84         struct list_head list;
  85         const char *path;
  86         const char *user;
  87         const char *pass;
  88 };
  89
  90 enum http_method {
  91         UH_HTTP_MSG_GET,
  92         UH_HTTP_MSG_POST,
  93         UH_HTTP_MSG_HEAD,
  94         UH_HTTP_MSG_OPTIONS,
  95 };
  96
  97 enum http_version {
  98         UH_HTTP_VER_0_9,
  99         UH_HTTP_VER_1_0,
 100         UH_HTTP_VER_1_1,
 101 };
 102
 103 enum http_user_agent {
 104         UH_UA_UNKNOWN,
 105         UH_UA_GECKO,
 106         UH_UA_CHROME,
 107         UH_UA_SAFARI,
 108         UH_UA_MSIE,
 109         UH_UA_KONQUEROR,
 110         UH_UA_OPERA,
 111         UH_UA_MSIE_OLD,
 112         UH_UA_MSIE_NEW,
 113 };
 114
 115 struct http_request {
 116         enum http_method method;
 117         enum http_version version;
 118         enum http_user_agent ua;
 119         int redirect_status;
 120         int content_length;
 121         bool expect_cont;
 122         bool connection_close;
 123         bool disable_chunked;
 124         uint8_t transfer_chunked;
 125         const struct auth_realm *realm;
 126 };
 127
 128 enum client_state {
 129         CLIENT_STATE_INIT,
 130         CLIENT_STATE_HEADER,
 131         CLIENT_STATE_DATA,
 132         CLIENT_STATE_DONE,
 133         CLIENT_STATE_CLOSE,
 134         CLIENT_STATE_CLEANUP,
 135 };
 136
 137 struct interpreter {
 138         struct list_head list;
 139         const char *path;
 140         const char *ext;
 141 };
 142
 143 struct path_info {
 144         const char *root;
 145         const char *phys;
 146         const char *name;
 147         const char *info;
 148         const char *query;
 149         const char *auth;
 150         bool redirected;
 151         struct stat stat;
 152         const struct interpreter *ip;
 153 };
 154
 155 struct env_var {
 156         const char *name;
 157         const char *value;
 158 };
 159
 160 struct relay {
 161         struct ustream_fd sfd;
 162         struct uloop_process proc;
 163         struct uloop_timeout timeout;
 164         struct client *cl;
 165
 166         bool process_done;
 167         bool error;
 168         bool skip_data;
 169
 170         int ret;
 171         int header_ofs;
 172
 173         void (*header_cb)(struct relay *r, const char *name, const char *value);
 174         void (*header_end)(struct relay *r);
 175         void (*close)(struct relay *r, int ret);
 176 };
 177
 178 struct dispatch_proc {
 179         struct uloop_timeout timeout;
 180         struct blob_buf hdr;
 181         struct uloop_fd wrfd;
 182         struct relay r;
 183         int status_code;
 184         char *status_msg;
 185 };
 186
 187 struct dispatch_handler {
 188         struct list_head list;
 189         bool script;
 190
 191         bool (*check_url)(const char *url);
 192         bool (*check_path)(struct path_info *pi, const char *url);
 193         void (*handle_request)(struct client *cl, char *url, struct path_info *pi);
 194 };
 195
 196 #ifdef HAVE_UBUS
 197 struct dispatch_ubus {
 198         struct ubus_request req;
 199
 200         struct uloop_timeout timeout;
 201         struct json_tokener *jstok;
 202         struct json_object *jsobj;
 203         struct json_object *jsobj_cur;
 204         int post_len;
 205
 206         uint32_t obj;
 207         const char *func;
 208
 209         struct blob_buf buf;
 210         bool req_pending;
 211         bool array;
 212         int array_idx;
 213 };
 214 #endif
 215
 216 struct dispatch {
 217         int (*data_send)(struct client *cl, const char *data, int len);
 218         void (*data_done)(struct client *cl);
 219         void (*write_cb)(struct client *cl);
 220         void (*close_fds)(struct client *cl);
 221         void (*free)(struct client *cl);
 222
 223         void *req_data;
 224         void (*req_free)(struct client *cl);
 225
 226         bool data_blocked;
 227         bool no_cache;
 228
 229         union {
 230                 struct {
 231                         struct blob_attr **hdr;
 232                         int fd;
 233                 } file;
 234                 struct dispatch_proc proc;
 235 #ifdef HAVE_UBUS
 236                 struct dispatch_ubus ubus;
 237 #endif
 238         };
 239 };
 240
 241 struct client {
 242         struct list_head list;
 243         int refcount;
 244         int id;
 245
 246         struct ustream *us;
 247         struct ustream_fd sfd;
 248 #ifdef HAVE_TLS
 249         struct ustream_ssl ssl;
 250 #endif
 251         struct uloop_timeout timeout;
 252         int requests;
 253
 254         enum client_state state;
 255         bool tls;
 256
 257         int http_code;
 258         struct http_request request;
 259         struct uh_addr srv_addr, peer_addr;
 260
 261         struct blob_buf hdr;
 262         struct blob_buf hdr_response;
 263         struct dispatch dispatch;
 264 };
 265
 266 extern char uh_buf[4096];
 267 extern int n_clients;
 268 extern struct config conf;
 269 extern const char * const http_versions[];
 270 extern const char * const http_methods[];
 271 extern struct dispatch_handler cgi_dispatch;
 272
 273 void uh_index_add(const char *filename);
 274
 275 bool uh_accept_client(int fd, bool tls);
 276
 277 void uh_unblock_listeners(void);
 278 void uh_setup_listeners(void);
 279 int uh_socket_bind(const char *host, const char *port, bool tls);
 280
 281 int uh_first_tls_port(int family);
 282
 283 bool uh_use_chunked(struct client *cl);
 284 void uh_chunk_write(struct client *cl, const void *data, int len);
 285 void uh_chunk_vprintf(struct client *cl, const char *format, va_list arg);
 286
 287 void __printf(2, 3)
 288 uh_chunk_printf(struct client *cl, const char *format, ...);
 289
 290 void uh_chunk_eof(struct client *cl);
 291 void uh_request_done(struct client *cl);
 292
 293 void uh_http_header(struct client *cl, int code, const char *summary);
 294 void __printf(4, 5)
 295 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...);
 296
 297 void uh_handle_request(struct client *cl);
 298 void client_poll_post_data(struct client *cl);
 299 void uh_client_read_cb(struct client *cl);
 300 void uh_client_notify_state(struct client *cl);
 301
 302 void uh_auth_add(const char *path, const char *user, const char *pass);
 303 bool uh_auth_check(struct client *cl, struct path_info *pi);
 304
 305 void uh_close_listen_fds(void);
 306 void uh_close_fds(void);
 307
 308 void uh_interpreter_add(const char *ext, const char *path);
 309 void uh_dispatch_add(struct dispatch_handler *d);
 310
 311 void uh_relay_open(struct client *cl, struct relay *r, int fd, int pid);
 312 void uh_relay_close(struct relay *r, int ret);
 313 void uh_relay_free(struct relay *r);
 314 void uh_relay_kill(struct client *cl, struct relay *r);
 315
 316 struct env_var *uh_get_process_vars(struct client *cl, struct path_info *pi);
 317 bool uh_create_process(struct client *cl, struct path_info *pi, char *url,
 318                        void (*cb)(struct client *cl, struct path_info *pi, char *url));
 319
 320 int uh_plugin_init(const char *name);
 321 void uh_plugin_post_init(void);
 322
 323 int uh_handler_add(const char *file);
 324 int uh_handler_run(struct client *cl, char **url, bool fallback);
 325
 326 struct path_info *uh_path_lookup(struct client *cl, const char *url);
 327
 328 static inline void uh_client_ref(struct client *cl)
 329 {
 330         cl->refcount++;
 331 }
 332
 333 static inline void uh_client_unref(struct client *cl)
 334 {
 335         if (--cl->refcount)
 336                 return;
 337
 338         if (cl->state == CLIENT_STATE_CLEANUP)
 339                 ustream_state_change(cl->us);
 340 }
 341
 342 #endif