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         uint8_t transfer_chunked;
  85         const struct auth_realm *realm;
  86 };
  87
  88 enum client_state {
  89         CLIENT_STATE_INIT,
  90         CLIENT_STATE_HEADER,
  91         CLIENT_STATE_DATA,
  92         CLIENT_STATE_DONE,
  93         CLIENT_STATE_CLOSE,
  94 };
  95
  96 struct interpreter {
  97         struct list_head list;
  98         const char *path;
  99         const char *ext;
 100 };
 101
 102 struct path_info {
 103         const char *root;
 104         const char *phys;
 105         const char *name;
 106         const char *info;
 107         const char *query;
 108         const char *auth;
 109         bool redirected;
 110         struct stat stat;
 111         const struct interpreter *ip;
 112 };
 113
 114 struct env_var {
 115         const char *name;
 116         const char *value;
 117 };
 118
 119 struct relay {
 120         struct ustream_fd sfd;
 121         struct uloop_process proc;
 122         struct client *cl;
 123
 124         bool process_done;
 125         int ret;
 126         int header_ofs;
 127
 128         void (*header_cb)(struct relay *r, const char *name, const char *value);
 129         void (*header_end)(struct relay *r);
 130         void (*close)(struct relay *r, int ret);
 131 };
 132
 133 struct dispatch_handler {
 134         struct list_head list;
 135
 136         bool (*check_url)(const char *url);
 137         bool (*check_path)(struct path_info *pi, const char *url);
 138         void (*handle_request)(struct client *cl, const char *url, struct path_info *pi);
 139 };
 140
 141 struct dispatch {
 142         void (*data_send)(struct client *cl, const char *data, int len);
 143         void (*data_done)(struct client *cl);
 144         void (*write_cb)(struct client *cl);
 145         void (*close_fds)(struct client *cl);
 146         void (*free)(struct client *cl);
 147         union {
 148                 struct {
 149                         struct blob_attr **hdr;
 150                         int fd;
 151                 } file;
 152                 struct {
 153                         struct blob_buf hdr;
 154                         struct relay r;
 155                         int status_code;
 156                         char *status_msg;
 157                 } proc;
 158         };
 159 };
 160
 161 struct client {
 162         struct list_head list;
 163         int id;
 164
 165         struct ustream *us;
 166         struct ustream_fd sfd;
 167 #ifdef HAVE_TLS
 168         struct ustream_ssl stream_ssl;
 169 #endif
 170         struct uloop_timeout timeout;
 171
 172         enum client_state state;
 173
 174         struct http_request request;
 175         struct uh_addr srv_addr, peer_addr;
 176
 177         struct blob_buf hdr;
 178         struct dispatch dispatch;
 179 };
 180
 181 extern char uh_buf[4096];
 182 extern int n_clients;
 183 extern struct config conf;
 184 extern const char * const http_versions[];
 185 extern const char * const http_methods[];
 186 extern struct dispatch_handler cgi_dispatch;
 187
 188 void uh_index_add(const char *filename);
 189
 190 void uh_accept_client(int fd);
 191
 192 void uh_unblock_listeners(void);
 193 void uh_setup_listeners(void);
 194 int uh_socket_bind(const char *host, const char *port, bool tls);
 195
 196 bool uh_use_chunked(struct client *cl);
 197 void uh_chunk_write(struct client *cl, const void *data, int len);
 198 void uh_chunk_vprintf(struct client *cl, const char *format, va_list arg);
 199
 200 void __printf(2, 3)
 201 uh_chunk_printf(struct client *cl, const char *format, ...);
 202
 203 void uh_chunk_eof(struct client *cl);
 204 void uh_request_done(struct client *cl);
 205
 206 void uh_http_header(struct client *cl, int code, const char *summary);
 207 void __printf(4, 5)
 208 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...);
 209
 210 void uh_handle_request(struct client *cl);
 211
 212 void uh_auth_add(const char *path, const char *user, const char *pass);
 213 bool uh_auth_check(struct client *cl, struct path_info *pi);
 214
 215 void uh_close_listen_fds(void);
 216 void uh_close_fds(void);
 217
 218 void uh_interpreter_add(const char *ext, const char *path);
 219 void uh_dispatch_add(struct dispatch_handler *d);
 220
 221 void uh_relay_open(struct client *cl, struct relay *r, int fd, int pid);
 222 void uh_relay_close(struct relay *r, int ret);
 223 void uh_relay_free(struct relay *r);
 224
 225 struct env_var *uh_get_process_vars(struct client *cl, struct path_info *pi);
 226 bool uh_create_process(struct client *cl, struct path_info *pi,
 227                        void (*cb)(struct client *cl, struct path_info *pi, int fd));
 228
 229 #endif