http_send.c

   1 /*
   2  * Copyright (C) 2005-2009 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 /** For each connected client, a structure of this type is maintained. */
  45 struct private_http_sender_data {
  46         /** The current state of this client. */
  47         enum http_client_status status;
  48 };
  49
  50 static struct sender_status http_sender_status, *hss = &http_sender_status;
  51
  52 static int http_send_msg(struct sender_client *sc, const char *msg)
  53 {
  54         int ret = send_buffer(sc->fd, msg);
  55
  56         if (ret < 0)
  57                 shutdown_client(sc, hss);
  58         return ret;
  59 }
  60
  61 static void http_send_ok_msg(struct sender_client *sc)
  62 {
  63         PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
  64         http_send_msg(sc, HTTP_OK_MSG);
  65 }
  66
  67 static int http_send_err_msg(struct sender_client *sc)
  68 {
  69         PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
  70         return http_send_msg(sc, HTTP_ERR_MSG);
  71 }
  72
  73 static void http_shutdown_clients(void)
  74 {
  75         shutdown_clients(hss);
  76 }
  77
  78 static void http_send(long unsigned current_chunk,
  79         __a_unused long unsigned chunks_sent, const char *buf, size_t len,
  80         const char *header_buf, size_t header_len)
  81 {
  82         struct sender_client *sc, *tmp;
  83
  84         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
  85                 struct private_http_sender_data *phsd = sc->private_data;
  86                 if (phsd->status != HTTP_STREAMING)
  87                         continue;
  88                 send_chunk(sc, hss, 0, current_chunk, buf, len, header_buf,
  89                         header_len);
  90         }
  91 }
  92
  93 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
  94 {
  95         struct sender_client *sc, *tmp;
  96         struct private_http_sender_data *phsd;
  97
  98         if (hss->listen_fd < 0)
  99                 return;
 100         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 101                 phsd = sc->private_data;
 102                 switch (phsd->status) {
 103                 case HTTP_STREAMING: /* nothing to do */
 104                         break;
 105                 case HTTP_CONNECTED: /* need to recv get request */
 106                         if (FD_ISSET(sc->fd, rfds)) {
 107                                 if (recv_pattern(sc->fd, HTTP_GET_MSG, MAXLINE)
 108                                                 < 0) {
 109                                         phsd->status = HTTP_INVALID_GET_REQUEST;
 110                                 } else {
 111                                         phsd->status = HTTP_GOT_GET_REQUEST;
 112                                         PARA_INFO_LOG("received get request\n");
 113                                 }
 114                         }
 115                         break;
 116                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 117                         phsd->status = HTTP_STREAMING;
 118                         http_send_ok_msg(sc);
 119                         break;
 120                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 121                         if (http_send_err_msg(sc) >= 0)
 122                                 shutdown_client(sc, hss);
 123                         break;
 124                 }
 125         }
 126         if (!FD_ISSET(hss->listen_fd, rfds))
 127                 return;
 128         sc = accept_sender_client(hss);
 129         if (!sc)
 130                 return;
 131         phsd = para_malloc(sizeof(*phsd));
 132         sc->private_data = phsd;
 133         phsd->status = HTTP_CONNECTED;
 134 }
 135
 136 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
 137 {
 138         struct sender_client *sc, *tmp;
 139
 140         if (hss->listen_fd < 0)
 141                 return;
 142         para_fd_set(hss->listen_fd, rfds, max_fileno);
 143         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 144                 struct private_http_sender_data *phsd = sc->private_data;
 145                 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
 146                         para_fd_set(sc->fd, rfds, max_fileno);
 147                 if (phsd->status == HTTP_GOT_GET_REQUEST ||
 148                                 phsd->status == HTTP_INVALID_GET_REQUEST)
 149                         para_fd_set(sc->fd, wfds, max_fileno);
 150         }
 151 }
 152
 153 static int http_com_on(__a_unused struct sender_command_data *scd)
 154 {
 155         return generic_com_on(hss, IPPROTO_TCP);
 156 }
 157
 158 static int http_com_off(__a_unused struct sender_command_data *scd)
 159 {
 160         generic_com_off(hss);
 161         return 1;
 162 }
 163
 164 static int http_com_deny(struct sender_command_data *scd)
 165 {
 166         generic_com_deny(scd, hss);
 167         return 1;
 168 }
 169
 170 static int http_com_allow(struct sender_command_data *scd)
 171 {
 172         generic_com_allow(scd, hss);
 173         return 1;
 174 }
 175
 176 static char *http_info(void)
 177 {
 178         return get_sender_info(hss, "http");
 179 }
 180
 181 /**
 182  * The init function of the http sender.
 183  *
 184  * \param s Pointer to the http sender struct.
 185  *
 186  * It initializes all function pointers of \a s, the client list and the access
 187  * control list. If the autostart option was given, the tcp port is opened.
 188  */
 189 void http_send_init(struct sender *s)
 190 {
 191         int ret;
 192         s->info = http_info;
 193         s->send = http_send;
 194         s->pre_select = http_pre_select;
 195         s->post_select = http_post_select;
 196         s->shutdown_clients = http_shutdown_clients;
 197         s->help = generic_sender_help;
 198         s->client_cmds[SENDER_ON] = http_com_on;
 199         s->client_cmds[SENDER_OFF] = http_com_off;
 200         s->client_cmds[SENDER_DENY] = http_com_deny;
 201         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 202         s->client_cmds[SENDER_ADD] = NULL;
 203         s->client_cmds[SENDER_DELETE] = NULL;
 204
 205         init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
 206                 conf.http_port_arg, conf.http_max_clients_arg,
 207                 conf.http_default_deny_given);
 208         if (conf.http_no_autostart_given)
 209                 return;
 210         ret = generic_com_on(hss, IPPROTO_TCP);
 211         if (ret < 0)
 212                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 213 }