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 #define UH_LIMIT_HEADERS        64
  37
  38 #define __enum_header(_name) HDR_##_name,
  39 #define __blobmsg_header(_name) [HDR_##_name] = { .name = #_name, .type = BLOBMSG_TYPE_STRING },
  40
  41 struct client;
  42
  43 struct config {
  44         const char *docroot;
  45         const char *realm;
  46         const char *file;
  47         const char *error_handler;
  48         const char *cgi_prefix;
  49         const char *cgi_path;
  50         int no_symlinks;
  51         int no_dirlists;
  52         int network_timeout;
  53         int rfc1918_filter;
  54         int tcp_keepalive;
  55         int max_requests;
  56         int http_keepalive;
  57         int script_timeout;
  58 };
  59
  60 struct auth_realm {
  61         struct list_head list;
  62         char *path;
  63         char *user;
  64         char *pass;
  65 };
  66
  67 enum http_method {
  68         UH_HTTP_MSG_GET,
  69         UH_HTTP_MSG_POST,
  70         UH_HTTP_MSG_HEAD,
  71 };
  72
  73 enum http_version {
  74         UH_HTTP_VER_0_9,
  75         UH_HTTP_VER_1_0,
  76         UH_HTTP_VER_1_1,
  77 };
  78
  79 struct http_request {
  80         enum http_method method;
  81         enum http_version version;
  82         int redirect_status;
  83         char *url;
  84         const struct auth_realm *realm;
  85 };
  86
  87 enum client_state {
  88         CLIENT_STATE_INIT,
  89         CLIENT_STATE_HEADER,
  90         CLIENT_STATE_DATA,
  91         CLIENT_STATE_DONE,
  92         CLIENT_STATE_CLOSE,
  93 };
  94
  95 struct interpreter {
  96         struct list_head list;
  97         char *path;
  98         char *ext;
  99 };
 100
 101 struct path_info {
 102         const char *root;
 103         const char *phys;
 104         const char *name;
 105         const char *info;
 106         const char *query;
 107         int redirected;
 108         struct stat stat;
 109         struct interpreter *ip;
 110 };
 111
 112 struct env_var {
 113         const char *name;
 114         const char *value;
 115 };
 116
 117 struct relay {
 118         struct ustream_fd sfd;
 119         struct uloop_process proc;
 120         struct client *cl;
 121
 122         bool process_done;
 123         int ret;
 124         int header_ofs;
 125
 126         void (*header_cb)(struct relay *r, const char *name, const char *value);
 127         void (*header_end)(struct relay *r);
 128         void (*close)(struct relay *r, int ret);
 129 };
 130
 131 struct dispatch_handler {
 132         struct list_head list;
 133
 134         bool (*check_url)(const char *url);
 135         bool (*check_path)(struct path_info *pi, const char *url);
 136         void (*handle_request)(struct client *cl, const char *url, struct path_info *pi);
 137 };
 138
 139 struct client {
 140         struct list_head list;
 141         int id;
 142
 143         struct ustream *us;
 144         struct ustream_fd sfd;
 145 #ifdef HAVE_TLS
 146         struct ustream_ssl stream_ssl;
 147 #endif
 148         struct uloop_timeout timeout;
 149
 150         enum client_state state;
 151
 152         struct http_request request;
 153         struct sockaddr_in6 servaddr;
 154         struct sockaddr_in6 peeraddr;
 155
 156         struct blob_buf hdr;
 157
 158         struct {
 159                 void (*write_cb)(struct client *cl);
 160                 void (*close_fds)(struct client *cl);
 161                 void (*free)(struct client *cl);
 162                 union {
 163                         struct {
 164                                 struct blob_attr **hdr;
 165                                 int fd;
 166                         } file;
 167                         struct {
 168                                 struct blob_buf hdr;
 169                                 struct relay r;
 170                                 int status_code;
 171                                 char *status_msg;
 172                         } proc;
 173                 };
 174         } dispatch;
 175 };
 176
 177 extern char uh_buf[4096];
 178 extern int n_clients;
 179 extern struct config conf;
 180 extern const char * const http_versions[];
 181 extern const char * const http_methods[];
 182 extern struct dispatch_handler cgi_dispatch;
 183
 184 void uh_index_add(const char *filename);
 185
 186 void uh_accept_client(int fd);
 187
 188 void uh_unblock_listeners(void);
 189 void uh_setup_listeners(void);
 190 int uh_socket_bind(const char *host, const char *port, bool tls);
 191
 192 bool uh_use_chunked(struct client *cl);
 193 void uh_chunk_write(struct client *cl, const void *data, int len);
 194 void uh_chunk_vprintf(struct client *cl, const char *format, va_list arg);
 195
 196 void __printf(2, 3)
 197 uh_chunk_printf(struct client *cl, const char *format, ...);
 198
 199 void uh_chunk_eof(struct client *cl);
 200 void uh_request_done(struct client *cl);
 201
 202 void uh_http_header(struct client *cl, int code, const char *summary);
 203 void __printf(4, 5)
 204 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...);
 205
 206 void uh_handle_request(struct client *cl);
 207
 208 void uh_auth_add(const char *path, const char *user, const char *pass);
 209
 210 void uh_close_listen_fds(void);
 211 void uh_close_fds(void);
 212
 213 void uh_interpreter_add(const char *ext, const char *path);
 214 void uh_dispatch_add(struct dispatch_handler *d);
 215
 216 void uh_relay_open(struct client *cl, struct relay *r, int fd, int pid);
 217 void uh_relay_close(struct relay *r, int ret);
 218 void uh_relay_free(struct relay *r);
 219
 220 struct env_var *uh_get_process_vars(struct client *cl, struct path_info *pi);
 221 bool uh_create_process(struct client *cl, struct path_info *pi,
 222                        void (*cb)(struct client *cl, struct path_info *pi, int fd));
 223
 224 #endif