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
  33 #include "utils.h"
  34
  35 #define UH_LIMIT_CLIENTS        64
  36
  37 #define __enum_header(_name) HDR_##_name,
  38 #define __blobmsg_header(_name) [HDR_##_name] = { .name = #_name, .type = BLOBMSG_TYPE_STRING },
  39
  40 struct client;
  41
  42 struct config {
  43         const char *docroot;
  44         const char *realm;
  45         const char *file;
  46         const char *error_handler;
  47         const char *cgi_prefix;
  48         const char *cgi_path;
  49         int no_symlinks;
  50         int no_dirlists;
  51         int network_timeout;
  52         int rfc1918_filter;
  53         int tcp_keepalive;
  54         int max_requests;
  55         int http_keepalive;
  56         int script_timeout;
  57 };
  58
  59 struct auth_realm {
  60         struct list_head list;
  61         const char *path;
  62         const char *user;
  63         const char *pass;
  64 };
  65
  66 enum http_method {
  67         UH_HTTP_MSG_GET,
  68         UH_HTTP_MSG_POST,
  69         UH_HTTP_MSG_HEAD,
  70 };
  71
  72 enum http_version {
  73         UH_HTTP_VER_0_9,
  74         UH_HTTP_VER_1_0,
  75         UH_HTTP_VER_1_1,
  76 };
  77
  78 struct http_request {
  79         enum http_method method;
  80         enum http_version version;
  81         int redirect_status;
  82         int content_length;
  83         bool expect_cont;
  84         bool transfer_chunked;
  85         const char *url;
  86         const struct auth_realm *realm;
  87 };
  88
  89 enum client_state {
  90         CLIENT_STATE_INIT,
  91         CLIENT_STATE_HEADER,
  92         CLIENT_STATE_DATA,
  93         CLIENT_STATE_DONE,
  94         CLIENT_STATE_CLOSE,
  95 };
  96
  97 struct interpreter {
  98         struct list_head list;
  99         const char *path;
 100         const char *ext;
 101 };
 102
 103 struct path_info {
 104         const char *root;
 105         const char *phys;
 106         const char *name;
 107         const char *info;
 108         const char *query;
 109         const char *auth;
 110         bool redirected;
 111         struct stat stat;
 112         const struct interpreter *ip;
 113 };
 114
 115 struct env_var {
 116         const char *name;
 117         const char *value;
 118 };
 119
 120 struct relay {
 121         struct ustream_fd sfd;
 122         struct uloop_process proc;
 123         struct client *cl;
 124
 125         bool process_done;
 126         int ret;
 127         int header_ofs;
 128
 129         void (*header_cb)(struct relay *r, const char *name, const char *value);
 130         void (*header_end)(struct relay *r);
 131         void (*close)(struct relay *r, int ret);
 132 };
 133
 134 struct dispatch_handler {
 135         struct list_head list;
 136
 137         bool (*check_url)(const char *url);
 138         bool (*check_path)(struct path_info *pi, const char *url);
 139         void (*handle_request)(struct client *cl, const char *url, struct path_info *pi);
 140 };
 141
 142 struct dispatch {
 143         void (*data_send)(struct client *cl, const char *data, int len);
 144         void (*data_done)(struct client *cl);
 145         void (*write_cb)(struct client *cl);
 146         void (*close_fds)(struct client *cl);
 147         void (*free)(struct client *cl);
 148         union {
 149                 struct {
 150                         struct blob_attr **hdr;
 151                         int fd;
 152                 } file;
 153                 struct {
 154                         struct blob_buf hdr;
 155                         struct relay r;
 156                         int status_code;
 157                         char *status_msg;
 158                 } proc;
 159         };
 160 };
 161
 162 struct client {
 163         struct list_head list;
 164         int id;
 165
 166         struct ustream *us;
 167         struct ustream_fd sfd;
 168 #ifdef HAVE_TLS
 169         struct ustream_ssl stream_ssl;
 170 #endif
 171         struct uloop_timeout timeout;
 172
 173         enum client_state state;
 174
 175         struct http_request request;
 176         struct uh_addr srv_addr, peer_addr;
 177
 178         struct blob_buf hdr;
 179         struct dispatch dispatch;
 180 };
 181
 182 extern char uh_buf[4096];
 183 extern int n_clients;
 184 extern struct config conf;
 185 extern const char * const http_versions[];
 186 extern const char * const http_methods[];
 187 extern struct dispatch_handler cgi_dispatch;
 188
 189 void uh_index_add(const char *filename);
 190
 191 void uh_accept_client(int fd);
 192
 193 void uh_unblock_listeners(void);
 194 void uh_setup_listeners(void);
 195 int uh_socket_bind(const char *host, const char *port, bool tls);
 196
 197 bool uh_use_chunked(struct client *cl);
 198 void uh_chunk_write(struct client *cl, const void *data, int len);
 199 void uh_chunk_vprintf(struct client *cl, const char *format, va_list arg);
 200
 201 void __printf(2, 3)
 202 uh_chunk_printf(struct client *cl, const char *format, ...);
 203
 204 void uh_chunk_eof(struct client *cl);
 205 void uh_request_done(struct client *cl);
 206
 207 void uh_http_header(struct client *cl, int code, const char *summary);
 208 void __printf(4, 5)
 209 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...);
 210
 211 void uh_handle_request(struct client *cl);
 212
 213 void uh_auth_add(const char *path, const char *user, const char *pass);
 214 bool uh_auth_check(struct client *cl, struct path_info *pi);
 215
 216 void uh_close_listen_fds(void);
 217 void uh_close_fds(void);
 218
 219 void uh_interpreter_add(const char *ext, const char *path);
 220 void uh_dispatch_add(struct dispatch_handler *d);
 221
 222 void uh_relay_open(struct client *cl, struct relay *r, int fd, int pid);
 223 void uh_relay_close(struct relay *r, int ret);
 224 void uh_relay_free(struct relay *r);
 225
 226 struct env_var *uh_get_process_vars(struct client *cl, struct path_info *pi);
 227 bool uh_create_process(struct client *cl, struct path_info *pi,
 228                        void (*cb)(struct client *cl, struct path_info *pi, int fd));
 229
 230 #endif