http_send.c

   1 /*
   2  * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file http_send.c paraslash's http sender */
   8
   9 #include <sys/types.h>
  10 #include <dirent.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "string.h"
  15 #include "server.cmdline.h"
  16 #include "afh.h"
  17 #include "afs.h"
  18 #include "server.h"
  19 #include "http.h"
  20 #include "vss.h"
  21 #include "list.h"
  22 #include "send.h"
  23 #include "close_on_fork.h"
  24 #include "net.h"
  25 #include "fd.h"
  26 #include "chunk_queue.h"
  27 #include "acl.h"
  28
  29 /** Message sent to clients that do not send a valid get request. */
  30 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  31
  32 /** The possible states of a client from the server's POV. */
  33 enum http_client_status {
  34         /** We accepted the connection on the tcp socket. */
  35         HTTP_CONNECTED,
  36         /** Successfully received the get request. */
  37         HTTP_GOT_GET_REQUEST,
  38         /** Connection is ready for sending audio data. */
  39         HTTP_STREAMING,
  40         /** We didn't receive a valid get request. */
  41         HTTP_INVALID_GET_REQUEST
  42 };
  43
  44 struct private_http_sender_data {
  45         enum http_client_status status;
  46 };
  47
  48 static struct sender_status http_sender_status, *hss = &http_sender_status;
  49
  50 static int http_send_msg(struct sender_client *sc, const char *msg)
  51 {
  52         int ret = send_buffer(sc->fd, msg);
  53
  54         if (ret < 0)
  55                 shutdown_client(sc, hss);
  56         return ret;
  57 }
  58
  59 static void http_send_ok_msg(struct sender_client *sc)
  60 {
  61         PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
  62         http_send_msg(sc, HTTP_OK_MSG);
  63 }
  64
  65 static int http_send_err_msg(struct sender_client *sc)
  66 {
  67         PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
  68         return http_send_msg(sc, HTTP_ERR_MSG);
  69 }
  70
  71 static void http_shutdown_clients(void)
  72 {
  73         shutdown_clients(hss);
  74 }
  75
  76 static void http_send(long unsigned current_chunk,
  77         __a_unused long unsigned chunks_sent, const char *buf, size_t len,
  78         const char *header_buf, size_t header_len)
  79 {
  80         struct sender_client *sc, *tmp;
  81
  82         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
  83                 struct private_http_sender_data *phsd = sc->private_data;
  84                 if (phsd->status != HTTP_STREAMING)
  85                         continue;
  86                 send_chunk(sc, hss, 0, current_chunk, buf, len, header_buf,
  87                         header_len);
  88         }
  89 }
  90
  91 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
  92 {
  93         struct sender_client *sc, *tmp;
  94         struct private_http_sender_data *phsd;
  95
  96         if (hss->listen_fd < 0)
  97                 return;
  98         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
  99                 phsd = sc->private_data;
 100                 switch (phsd->status) {
 101                 case HTTP_STREAMING: /* nothing to do */
 102                         break;
 103                 case HTTP_CONNECTED: /* need to recv get request */
 104                         if (FD_ISSET(sc->fd, rfds)) {
 105                                 if (recv_pattern(sc->fd, HTTP_GET_MSG, MAXLINE)
 106                                                 < 0) {
 107                                         phsd->status = HTTP_INVALID_GET_REQUEST;
 108                                 } else {
 109                                         phsd->status = HTTP_GOT_GET_REQUEST;
 110                                         PARA_INFO_LOG("received get request\n");
 111                                 }
 112                         }
 113                         break;
 114                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 115                         phsd->status = HTTP_STREAMING;
 116                         http_send_ok_msg(sc);
 117                         break;
 118                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 119                         if (http_send_err_msg(sc) >= 0)
 120                                 shutdown_client(sc, hss);
 121                         break;
 122                 }
 123         }
 124         if (!FD_ISSET(hss->listen_fd, rfds))
 125                 return;
 126         sc = accept_sender_client(hss);
 127         if (!sc)
 128                 return;
 129         phsd = para_malloc(sizeof(*phsd));
 130         sc->private_data = phsd;
 131         phsd->status = HTTP_CONNECTED;
 132 }
 133
 134 static void http_pre_select(int *max_fileno, fd_set *rfds, __a_unused fd_set *wfds)
 135 {
 136         struct sender_client *sc, *tmp;
 137
 138         if (hss->listen_fd < 0)
 139                 return;
 140         para_fd_set(hss->listen_fd, rfds, max_fileno);
 141         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 142                 struct private_http_sender_data *phsd = sc->private_data;
 143                 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
 144                         para_fd_set(sc->fd, rfds, max_fileno);
 145         }
 146 }
 147
 148 static int http_com_on(__a_unused struct sender_command_data *scd)
 149 {
 150         return generic_com_on(hss, IPPROTO_TCP);
 151 }
 152
 153 static int http_com_off(__a_unused struct sender_command_data *scd)
 154 {
 155         generic_com_off(hss);
 156         return 1;
 157 }
 158
 159 static int http_com_deny(struct sender_command_data *scd)
 160 {
 161         generic_com_deny(scd, hss);
 162         return 1;
 163 }
 164
 165 static int http_com_allow(struct sender_command_data *scd)
 166 {
 167         generic_com_allow(scd, hss);
 168         return 1;
 169 }
 170
 171 static char *http_info(void)
 172 {
 173         return get_sender_info(hss, "http");
 174 }
 175
 176 /**
 177  * The init function of the http sender.
 178  *
 179  * \param s Pointer to the http sender struct.
 180  *
 181  * It initializes all function pointers of \a s, the client list and the access
 182  * control list. If the autostart option was given, the tcp port is opened.
 183  */
 184 void http_send_init(struct sender *s)
 185 {
 186         int ret;
 187         s->info = http_info;
 188         s->send = http_send;
 189         s->pre_select = http_pre_select;
 190         s->post_select = http_post_select;
 191         s->shutdown_clients = http_shutdown_clients;
 192         s->help = generic_sender_help;
 193         s->client_cmds[SENDER_ON] = http_com_on;
 194         s->client_cmds[SENDER_OFF] = http_com_off;
 195         s->client_cmds[SENDER_DENY] = http_com_deny;
 196         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 197         s->client_cmds[SENDER_ADD] = NULL;
 198         s->client_cmds[SENDER_DELETE] = NULL;
 199
 200         init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
 201                 conf.http_port_arg, conf.http_max_clients_arg,
 202                 conf.http_default_deny_given);
 203         if (conf.http_no_autostart_given)
 204                 return;
 205         ret = generic_com_on(hss, IPPROTO_TCP);
 206         if (ret < 0)
 207                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 208 }