uhttpd.h

   1 /*
   2  * uhttpd - Tiny single-threaded httpd - Main header
   3  *
   4  *   Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org>
   5  *   Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   6  *
   7  *  Licensed under the Apache License, Version 2.0 (the "License");
   8  *  you may not use this file except in compliance with the License.
   9  *  You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  *  Unless required by applicable law or agreed to in writing, software
  14  *  distributed under the License is distributed on an "AS IS" BASIS,
  15  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  *  See the License for the specific language governing permissions and
  17  *  limitations under the License.
  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_TLS
  33 #include <libubox/ustream-ssl.h>
  34 #endif
  35
  36 #include "utils.h"
  37
  38 #define UH_LIMIT_CLIENTS        64
  39
  40 #define __enum_header(_name) HDR_##_name,
  41 #define __blobmsg_header(_name) [HDR_##_name] = { .name = #_name, .type = BLOBMSG_TYPE_STRING },
  42
  43 struct client;
  44
  45 struct config {
  46         const char *docroot;
  47         const char *realm;
  48         const char *file;
  49         const char *error_handler;
  50         const char *cgi_prefix;
  51         const char *cgi_path;
  52         const char *lua_handler;
  53         const char *lua_prefix;
  54         int no_symlinks;
  55         int no_dirlists;
  56         int network_timeout;
  57         int rfc1918_filter;
  58         int tcp_keepalive;
  59         int max_requests;
  60         int http_keepalive;
  61         int script_timeout;
  62 };
  63
  64 struct auth_realm {
  65         struct list_head list;
  66         const char *path;
  67         const char *user;
  68         const char *pass;
  69 };
  70
  71 enum http_method {
  72         UH_HTTP_MSG_GET,
  73         UH_HTTP_MSG_POST,
  74         UH_HTTP_MSG_HEAD,
  75 };
  76
  77 enum http_version {
  78         UH_HTTP_VER_0_9,
  79         UH_HTTP_VER_1_0,
  80         UH_HTTP_VER_1_1,
  81 };
  82
  83 struct http_request {
  84         enum http_method method;
  85         enum http_version version;
  86         int redirect_status;
  87         int content_length;
  88         bool expect_cont;
  89         uint8_t transfer_chunked;
  90         const struct auth_realm *realm;
  91 };
  92
  93 enum client_state {
  94         CLIENT_STATE_INIT,
  95         CLIENT_STATE_HEADER,
  96         CLIENT_STATE_DATA,
  97         CLIENT_STATE_DONE,
  98         CLIENT_STATE_CLOSE,
  99 };
 100
 101 struct interpreter {
 102         struct list_head list;
 103         const char *path;
 104         const char *ext;
 105 };
 106
 107 struct path_info {
 108         const char *root;
 109         const char *phys;
 110         const char *name;
 111         const char *info;
 112         const char *query;
 113         const char *auth;
 114         bool redirected;
 115         struct stat stat;
 116         const struct interpreter *ip;
 117 };
 118
 119 struct env_var {
 120         const char *name;
 121         const char *value;
 122 };
 123
 124 struct relay {
 125         struct ustream_fd sfd;
 126         struct uloop_process proc;
 127         struct client *cl;
 128
 129         bool process_done;
 130         int ret;
 131         int header_ofs;
 132
 133         void (*header_cb)(struct relay *r, const char *name, const char *value);
 134         void (*header_end)(struct relay *r);
 135         void (*close)(struct relay *r, int ret);
 136 };
 137
 138 struct dispatch_proc {
 139         struct blob_buf hdr;
 140         struct uloop_fd wrfd;
 141         struct relay r;
 142         int status_code;
 143         char *status_msg;
 144 };
 145
 146 struct dispatch_handler {
 147         struct list_head list;
 148
 149         bool (*check_url)(const char *url);
 150         bool (*check_path)(struct path_info *pi, const char *url);
 151         void (*handle_request)(struct client *cl, char *url, struct path_info *pi);
 152 };
 153
 154 struct dispatch {
 155         int (*data_send)(struct client *cl, const char *data, int len);
 156         void (*data_done)(struct client *cl);
 157         void (*write_cb)(struct client *cl);
 158         void (*close_fds)(struct client *cl);
 159         void (*free)(struct client *cl);
 160         bool data_blocked;
 161
 162         union {
 163                 struct {
 164                         struct blob_attr **hdr;
 165                         int fd;
 166                 } file;
 167                 struct dispatch_proc proc;
 168         };
 169 };
 170
 171 struct client {
 172         struct list_head list;
 173         int id;
 174
 175         struct ustream *us;
 176         struct ustream_fd sfd;
 177 #ifdef HAVE_TLS
 178         struct ustream_ssl ssl;
 179 #endif
 180         struct uloop_timeout timeout;
 181
 182         enum client_state state;
 183         bool tls;
 184
 185         struct http_request request;
 186         struct uh_addr srv_addr, peer_addr;
 187
 188         struct blob_buf hdr;
 189         struct dispatch dispatch;
 190 };
 191
 192 extern char uh_buf[4096];
 193 extern int n_clients;
 194 extern struct config conf;
 195 extern const char * const http_versions[];
 196 extern const char * const http_methods[];
 197 extern struct dispatch_handler cgi_dispatch;
 198
 199 void uh_index_add(const char *filename);
 200
 201 bool uh_accept_client(int fd, bool tls);
 202
 203 void uh_unblock_listeners(void);
 204 void uh_setup_listeners(void);
 205 int uh_socket_bind(const char *host, const char *port, bool tls);
 206
 207 bool uh_use_chunked(struct client *cl);
 208 void uh_chunk_write(struct client *cl, const void *data, int len);
 209 void uh_chunk_vprintf(struct client *cl, const char *format, va_list arg);
 210
 211 void __printf(2, 3)
 212 uh_chunk_printf(struct client *cl, const char *format, ...);
 213
 214 void uh_chunk_eof(struct client *cl);
 215 void uh_request_done(struct client *cl);
 216
 217 void uh_http_header(struct client *cl, int code, const char *summary);
 218 void __printf(4, 5)
 219 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...);
 220
 221 void uh_handle_request(struct client *cl);
 222 void client_poll_post_data(struct client *cl);
 223 void uh_client_read_cb(struct client *cl);
 224 void uh_client_notify_state(struct client *cl);
 225
 226 void uh_auth_add(const char *path, const char *user, const char *pass);
 227 bool uh_auth_check(struct client *cl, struct path_info *pi);
 228
 229 void uh_close_listen_fds(void);
 230 void uh_close_fds(void);
 231
 232 void uh_interpreter_add(const char *ext, const char *path);
 233 void uh_dispatch_add(struct dispatch_handler *d);
 234
 235 void uh_relay_open(struct client *cl, struct relay *r, int fd, int pid);
 236 void uh_relay_close(struct relay *r, int ret);
 237 void uh_relay_free(struct relay *r);
 238
 239 struct env_var *uh_get_process_vars(struct client *cl, struct path_info *pi);
 240 bool uh_create_process(struct client *cl, struct path_info *pi, char *url,
 241                        void (*cb)(struct client *cl, struct path_info *pi, char *url));
 242
 243 int uh_plugin_init(const char *name);
 244
 245 #endif