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 config {
  50         const char *docroot;
  51         const char *realm;
  52         const char *file;
  53         const char *error_handler;
  54         const char *cgi_prefix;
  55         const char *cgi_docroot_path;
  56         const char *cgi_path;
  57         const char *lua_handler;
  58         const char *lua_prefix;
  59         const char *ubus_prefix;
  60         const char *ubus_socket;
  61         int no_symlinks;
  62         int no_dirlists;
  63         int network_timeout;
  64         int rfc1918_filter;
  65         int tcp_keepalive;
  66         int max_script_requests;
  67         int max_connections;
  68         int http_keepalive;
  69         int script_timeout;
  70         int ubus_noauth;
  71         int ubus_cors;
  72 };
  73
  74 struct auth_realm {
  75         struct list_head list;
  76         const char *path;
  77         const char *user;
  78         const char *pass;
  79 };
  80
  81 enum http_method {
  82         UH_HTTP_MSG_GET,
  83         UH_HTTP_MSG_POST,
  84         UH_HTTP_MSG_HEAD,
  85         UH_HTTP_MSG_OPTIONS,
  86 };
  87
  88 enum http_version {
  89         UH_HTTP_VER_0_9,
  90         UH_HTTP_VER_1_0,
  91         UH_HTTP_VER_1_1,
  92 };
  93
  94 enum http_user_agent {
  95         UH_UA_UNKNOWN,
  96         UH_UA_GECKO,
  97         UH_UA_CHROME,
  98         UH_UA_SAFARI,
  99         UH_UA_MSIE,
 100         UH_UA_KONQUEROR,
 101         UH_UA_OPERA,
 102         UH_UA_MSIE_OLD,
 103         UH_UA_MSIE_NEW,
 104 };
 105
 106 struct http_request {
 107         enum http_method method;
 108         enum http_version version;
 109         enum http_user_agent ua;
 110         int redirect_status;
 111         int content_length;
 112         bool expect_cont;
 113         bool connection_close;
 114         bool respond_chunked;
 115         uint8_t transfer_chunked;
 116         const struct auth_realm *realm;
 117 };
 118
 119 enum client_state {
 120         CLIENT_STATE_INIT,
 121         CLIENT_STATE_HEADER,
 122         CLIENT_STATE_DATA,
 123         CLIENT_STATE_DONE,
 124         CLIENT_STATE_CLOSE,
 125         CLIENT_STATE_CLEANUP,
 126 };
 127
 128 struct interpreter {
 129         struct list_head list;
 130         const char *path;
 131         const char *ext;
 132 };
 133
 134 struct path_info {
 135         const char *root;
 136         const char *phys;
 137         const char *name;
 138         const char *info;
 139         const char *query;
 140         const char *auth;
 141         bool redirected;
 142         struct stat stat;
 143         const struct interpreter *ip;
 144 };
 145
 146 struct env_var {
 147         const char *name;
 148         const char *value;
 149 };
 150
 151 struct relay {
 152         struct ustream_fd sfd;
 153         struct uloop_process proc;
 154         struct uloop_timeout timeout;
 155         struct client *cl;
 156
 157         bool process_done;
 158         bool error;
 159         bool skip_data;
 160
 161         int ret;
 162         int header_ofs;
 163
 164         void (*header_cb)(struct relay *r, const char *name, const char *value);
 165         void (*header_end)(struct relay *r);
 166         void (*close)(struct relay *r, int ret);
 167 };
 168
 169 struct dispatch_proc {
 170         struct uloop_timeout timeout;
 171         struct blob_buf hdr;
 172         struct uloop_fd wrfd;
 173         struct relay r;
 174         int status_code;
 175         char *status_msg;
 176 };
 177
 178 struct dispatch_handler {
 179         struct list_head list;
 180         bool script;
 181
 182         bool (*check_url)(const char *url);
 183         bool (*check_path)(struct path_info *pi, const char *url);
 184         void (*handle_request)(struct client *cl, char *url, struct path_info *pi);
 185 };
 186
 187 #ifdef HAVE_UBUS
 188 struct dispatch_ubus {
 189         struct ubus_request req;
 190
 191         struct uloop_timeout timeout;
 192         struct json_tokener *jstok;
 193         struct json_object *jsobj;
 194         struct json_object *jsobj_cur;
 195         int post_len;
 196
 197         uint32_t obj;
 198         const char *func;
 199
 200         struct blob_buf buf;
 201         bool req_pending;
 202         bool array;
 203         int array_idx;
 204 };
 205 #endif
 206
 207 struct dispatch {
 208         int (*data_send)(struct client *cl, const char *data, int len);
 209         void (*data_done)(struct client *cl);
 210         void (*write_cb)(struct client *cl);
 211         void (*close_fds)(struct client *cl);
 212         void (*free)(struct client *cl);
 213
 214         void *req_data;
 215         void (*req_free)(struct client *cl);
 216
 217         bool data_blocked;
 218
 219         union {
 220                 struct {
 221                         struct blob_attr **hdr;
 222                         int fd;
 223                 } file;
 224                 struct dispatch_proc proc;
 225 #ifdef HAVE_UBUS
 226                 struct dispatch_ubus ubus;
 227 #endif
 228         };
 229 };
 230
 231 struct client {
 232         struct list_head list;
 233         int refcount;
 234         int id;
 235
 236         struct ustream *us;
 237         struct ustream_fd sfd;
 238 #ifdef HAVE_TLS
 239         struct ustream_ssl ssl;
 240 #endif
 241         struct uloop_timeout timeout;
 242         int requests;
 243
 244         enum client_state state;
 245         bool tls;
 246
 247         int http_code;
 248         struct http_request request;
 249         struct uh_addr srv_addr, peer_addr;
 250
 251         struct blob_buf hdr;
 252         struct dispatch dispatch;
 253 };
 254
 255 extern char uh_buf[4096];
 256 extern int n_clients;
 257 extern struct config conf;
 258 extern const char * const http_versions[];
 259 extern const char * const http_methods[];
 260 extern struct dispatch_handler cgi_dispatch;
 261
 262 void uh_index_add(const char *filename);
 263
 264 bool uh_accept_client(int fd, bool tls);
 265
 266 void uh_unblock_listeners(void);
 267 void uh_setup_listeners(void);
 268 int uh_socket_bind(const char *host, const char *port, bool tls);
 269
 270 bool uh_use_chunked(struct client *cl);
 271 void uh_chunk_write(struct client *cl, const void *data, int len);
 272 void uh_chunk_vprintf(struct client *cl, const char *format, va_list arg);
 273
 274 void __printf(2, 3)
 275 uh_chunk_printf(struct client *cl, const char *format, ...);
 276
 277 void uh_chunk_eof(struct client *cl);
 278 void uh_request_done(struct client *cl);
 279
 280 void uh_http_header(struct client *cl, int code, const char *summary);
 281 void __printf(4, 5)
 282 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...);
 283
 284 void uh_handle_request(struct client *cl);
 285 void client_poll_post_data(struct client *cl);
 286 void uh_client_read_cb(struct client *cl);
 287 void uh_client_notify_state(struct client *cl);
 288
 289 void uh_auth_add(const char *path, const char *user, const char *pass);
 290 bool uh_auth_check(struct client *cl, struct path_info *pi);
 291
 292 void uh_close_listen_fds(void);
 293 void uh_close_fds(void);
 294
 295 void uh_interpreter_add(const char *ext, const char *path);
 296 void uh_dispatch_add(struct dispatch_handler *d);
 297
 298 void uh_relay_open(struct client *cl, struct relay *r, int fd, int pid);
 299 void uh_relay_close(struct relay *r, int ret);
 300 void uh_relay_free(struct relay *r);
 301 void uh_relay_kill(struct client *cl, struct relay *r);
 302
 303 struct env_var *uh_get_process_vars(struct client *cl, struct path_info *pi);
 304 bool uh_create_process(struct client *cl, struct path_info *pi, char *url,
 305                        void (*cb)(struct client *cl, struct path_info *pi, char *url));
 306
 307 int uh_plugin_init(const char *name);
 308 void uh_plugin_post_init(void);
 309
 310 static inline void uh_client_ref(struct client *cl)
 311 {
 312         cl->refcount++;
 313 }
 314
 315 static inline void uh_client_unref(struct client *cl)
 316 {
 317         if (--cl->refcount)
 318                 return;
 319
 320         if (cl->state == CLIENT_STATE_CLEANUP)
 321                 ustream_state_change(cl->us);
 322 }
 323
 324 #endif