http_send.c

   1 /*
   2  * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
   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 <netinet/in.h>
  10 #include <sys/socket.h>
  11 #include <regex.h>
  12 #include <sys/types.h>
  13 #include <arpa/inet.h>
  14 #include <sys/un.h>
  15 #include <netdb.h>
  16 #include <lopsub.h>
  17
  18 #include "server.lsg.h"
  19 #include "para.h"
  20 #include "error.h"
  21 #include "string.h"
  22 #include "afh.h"
  23 #include "server.h"
  24 #include "http.h"
  25 #include "list.h"
  26 #include "send.h"
  27 #include "sched.h"
  28 #include "vss.h"
  29 #include "close_on_fork.h"
  30 #include "net.h"
  31 #include "fd.h"
  32 #include "chunk_queue.h"
  33 #include "acl.h"
  34
  35 /** Message sent to clients that do not send a valid get request. */
  36 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  37
  38 /** The possible states of a client from the server's POV. */
  39 enum http_client_status {
  40         /** We accepted the connection on the tcp socket. */
  41         HTTP_CONNECTED,
  42         /** Successfully received the get request. */
  43         HTTP_GOT_GET_REQUEST,
  44         /** Connection is ready for sending audio data. */
  45         HTTP_STREAMING,
  46         /** We didn't receive a valid get request. */
  47         HTTP_INVALID_GET_REQUEST
  48 };
  49
  50 /** For each connected client, a structure of this type is maintained. */
  51 struct private_http_sender_data {
  52         /** The current state of this client. */
  53         enum http_client_status status;
  54 };
  55
  56 static struct sender_status http_sender_status, *hss = &http_sender_status;
  57
  58 static int http_send_msg(struct sender_client *sc, const char *msg)
  59 {
  60         int ret = write_buffer(sc->fd, msg);
  61
  62         if (ret < 0)
  63                 shutdown_client(sc, hss);
  64         return ret;
  65 }
  66
  67 static void http_send_ok_msg(struct sender_client *sc)
  68 {
  69         PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
  70         http_send_msg(sc, HTTP_OK_MSG);
  71 }
  72
  73 static int http_send_err_msg(struct sender_client *sc)
  74 {
  75         PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
  76         return http_send_msg(sc, HTTP_ERR_MSG);
  77 }
  78
  79 static void http_shutdown_clients(void)
  80 {
  81         shutdown_clients(hss);
  82 }
  83
  84 static int queue_chunk_or_shutdown(struct sender_client *sc,
  85                 struct sender_status *ss, const char *buf, size_t num_bytes)
  86 {
  87         int ret = cq_enqueue(sc->cq, buf, num_bytes);
  88         if (ret < 0)
  89                 shutdown_client(sc, ss);
  90         return ret;
  91 }
  92
  93 /**
  94  * Send one chunk of audio data to a connected client.
  95  *
  96  * \param sc The client.
  97  * \param ss The sender.
  98  * \param current_chunk The number of the chunk to write.
  99  * \param buf The data to write.
 100  * \param len The number of bytes of \a buf.
 101  * \param header_buf The audio file header.
 102  * \param header_len The number of bytes of \a header_buf.
 103  *
 104  * On errors, the client is shut down. If only a part of the buffer could be
 105  * written, the remainder is put into the chunk queue for that client.
 106  */
 107 static void http_send_chunk(struct sender_client *sc, struct sender_status *ss,
 108                 long unsigned current_chunk, const char *buf, size_t len,
 109                 const char *header_buf, size_t header_len)
 110 {
 111         int ret;
 112
 113         if (!sc->header_sent && current_chunk) {
 114                 if (header_buf && header_len > 0) {
 115                         ret = queue_chunk_or_shutdown(sc, ss, header_buf, header_len);
 116                         if (ret < 0)
 117                                 goto out;
 118                 }
 119         }
 120         sc->header_sent = 1;
 121         ret = send_queued_chunks(sc->fd, sc->cq);
 122         if (ret < 0) {
 123                 shutdown_client(sc, ss);
 124                 goto out;
 125         }
 126         if (!len)
 127                 goto out;
 128         if (!ret) { /* still data left in the queue */
 129                 ret = queue_chunk_or_shutdown(sc, ss, buf, len);
 130                 goto out;
 131         }
 132         ret = xwrite(sc->fd, buf, len);
 133         if (ret < 0) {
 134                 shutdown_client(sc, ss);
 135                 goto out;
 136         }
 137         if (ret != len)
 138                 ret = queue_chunk_or_shutdown(sc, ss, buf + ret, len - ret);
 139 out:
 140         if (ret < 0)
 141                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 142 }
 143
 144 static void http_send(long unsigned current_chunk,
 145         __a_unused long unsigned chunks_sent, const char *buf, size_t len,
 146         const char *header_buf, size_t header_len)
 147 {
 148         struct sender_client *sc, *tmp;
 149
 150         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 151                 struct private_http_sender_data *phsd = sc->private_data;
 152
 153                 if (phsd->status == HTTP_STREAMING)
 154                         http_send_chunk(sc, hss, current_chunk, buf, len,
 155                                    header_buf, header_len);
 156         }
 157 }
 158
 159 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
 160 {
 161         struct sender_client *sc, *tmp;
 162         struct private_http_sender_data *phsd;
 163         int ret;
 164
 165         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 166                 phsd = sc->private_data;
 167                 switch (phsd->status) {
 168                 case HTTP_STREAMING: /* nothing to do */
 169                         break;
 170                 case HTTP_CONNECTED: /* need to recv get request */
 171                         ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
 172                         if (ret < 0)
 173                                 phsd->status = HTTP_INVALID_GET_REQUEST;
 174                         else if (ret > 0) {
 175                                 phsd->status = HTTP_GOT_GET_REQUEST;
 176                                 PARA_INFO_LOG("received get request\n");
 177                         }
 178                         break;
 179                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 180                         phsd->status = HTTP_STREAMING;
 181                         http_send_ok_msg(sc);
 182                         break;
 183                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 184                         if (http_send_err_msg(sc) >= 0)
 185                                 shutdown_client(sc, hss);
 186                         break;
 187                 }
 188         }
 189         sc = accept_sender_client(hss, rfds);
 190         if (!sc)
 191                 return;
 192         phsd = para_malloc(sizeof(*phsd));
 193         sc->private_data = phsd;
 194         phsd->status = HTTP_CONNECTED;
 195 }
 196
 197 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
 198 {
 199         struct sender_client *sc, *tmp;
 200
 201         if (hss->listen_fd < 0)
 202                 return;
 203         para_fd_set(hss->listen_fd, rfds, max_fileno);
 204         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 205                 struct private_http_sender_data *phsd = sc->private_data;
 206                 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
 207                         para_fd_set(sc->fd, rfds, max_fileno);
 208                 if (phsd->status == HTTP_GOT_GET_REQUEST ||
 209                                 phsd->status == HTTP_INVALID_GET_REQUEST)
 210                         para_fd_set(sc->fd, wfds, max_fileno);
 211         }
 212 }
 213
 214 static int http_com_on(__a_unused struct sender_command_data *scd)
 215 {
 216         return generic_com_on(hss, IPPROTO_TCP);
 217 }
 218
 219 static int http_com_off(__a_unused struct sender_command_data *scd)
 220 {
 221         generic_com_off(hss);
 222         return 1;
 223 }
 224
 225 static int http_com_deny(struct sender_command_data *scd)
 226 {
 227         generic_com_deny(scd, hss);
 228         return 1;
 229 }
 230
 231 static int http_com_allow(struct sender_command_data *scd)
 232 {
 233         generic_com_allow(scd, hss);
 234         return 1;
 235 }
 236
 237 static char *http_status(void)
 238 {
 239         return generic_sender_status(hss, "http");
 240 }
 241
 242 /**
 243  * The init function of the http sender.
 244  *
 245  * \param s Pointer to the http sender struct.
 246  *
 247  * It initializes all function pointers of \a s, the client list and the access
 248  * control list. If the autostart option was given, the tcp port is opened.
 249  */
 250 void http_send_init(struct sender *s)
 251 {
 252         int ret;
 253         s->status = http_status;
 254         s->send = http_send;
 255         s->pre_select = http_pre_select;
 256         s->post_select = http_post_select;
 257         s->shutdown_clients = http_shutdown_clients;
 258         s->resolve_target = NULL;
 259         s->help = generic_sender_help;
 260         s->client_cmds[SENDER_on] = http_com_on;
 261         s->client_cmds[SENDER_off] = http_com_off;
 262         s->client_cmds[SENDER_deny] = http_com_deny;
 263         s->client_cmds[SENDER_allow] = http_com_allow;
 264         s->client_cmds[SENDER_add] = NULL;
 265         s->client_cmds[SENDER_delete] = NULL;
 266
 267         init_sender_status(hss, OPT_RESULT(HTTP_ACCESS),
 268                 OPT_UINT32_VAL(HTTP_PORT), OPT_UINT32_VAL(HTTP_MAX_CLIENTS),
 269                 OPT_GIVEN(HTTP_DEFAULT_DENY));
 270         if (OPT_GIVEN(HTTP_NO_AUTOSTART))
 271                 return;
 272         ret = generic_com_on(hss, IPPROTO_TCP);
 273         if (ret < 0)
 274                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 275 }