http_send.c

   1 /*
   2  * Copyright (C) 2005-2014 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 <netinet/in.h>
  10 #include <sys/socket.h>
  11 #include <regex.h>
  12 #include <sys/types.h>
  13 #include <osl.h>
  14 #include <arpa/inet.h>
  15 #include <sys/un.h>
  16 #include <netdb.h>
  17
  18 #include "para.h"
  19 #include "error.h"
  20 #include "string.h"
  21 #include "server.cmdline.h"
  22 #include "afh.h"
  23 #include "afs.h"
  24 #include "server.h"
  25 #include "http.h"
  26 #include "list.h"
  27 #include "send.h"
  28 #include "sched.h"
  29 #include "vss.h"
  30 #include "close_on_fork.h"
  31 #include "net.h"
  32 #include "fd.h"
  33 #include "chunk_queue.h"
  34 #include "acl.h"
  35
  36 /** Message sent to clients that do not send a valid get request. */
  37 #define HTTP_ERR_MSG "HTTP/1.0 400 Bad Request\n"
  38
  39 /** The possible states of a client from the server's POV. */
  40 enum http_client_status {
  41         /** We accepted the connection on the tcp socket. */
  42         HTTP_CONNECTED,
  43         /** Successfully received the get request. */
  44         HTTP_GOT_GET_REQUEST,
  45         /** Connection is ready for sending audio data. */
  46         HTTP_STREAMING,
  47         /** We didn't receive a valid get request. */
  48         HTTP_INVALID_GET_REQUEST
  49 };
  50
  51 /** For each connected client, a structure of this type is maintained. */
  52 struct private_http_sender_data {
  53         /** The current state of this client. */
  54         enum http_client_status status;
  55 };
  56
  57 static struct sender_status http_sender_status, *hss = &http_sender_status;
  58
  59 static int http_send_msg(struct sender_client *sc, const char *msg)
  60 {
  61         int ret = write_buffer(sc->fd, msg);
  62
  63         if (ret < 0)
  64                 shutdown_client(sc, hss);
  65         return ret;
  66 }
  67
  68 static void http_send_ok_msg(struct sender_client *sc)
  69 {
  70         PARA_INFO_LOG("sending http ok message to fd %d\n", sc->fd);
  71         http_send_msg(sc, HTTP_OK_MSG);
  72 }
  73
  74 static int http_send_err_msg(struct sender_client *sc)
  75 {
  76         PARA_NOTICE_LOG("sending bad request message to fd %d\n", sc->fd);
  77         return http_send_msg(sc, HTTP_ERR_MSG);
  78 }
  79
  80 static void http_shutdown_clients(void)
  81 {
  82         shutdown_clients(hss);
  83 }
  84
  85 static int queue_chunk_or_shutdown(struct sender_client *sc,
  86                 struct sender_status *ss, const char *buf, size_t num_bytes)
  87 {
  88         int ret = cq_enqueue(sc->cq, buf, num_bytes);
  89         if (ret < 0)
  90                 shutdown_client(sc, ss);
  91         return ret;
  92 }
  93
  94 /**
  95  * Send one chunk of audio data to a connected client.
  96  *
  97  * \param sc The client.
  98  * \param ss The sender.
  99  * \param current_chunk The number of the chunk to write.
 100  * \param buf The data to write.
 101  * \param len The number of bytes of \a buf.
 102  * \param header_buf The audio file header.
 103  * \param header_len The number of bytes of \a header_buf.
 104  *
 105  * On errors, the client is shut down. If only a part of the buffer could be
 106  * written, the remainder is put into the chunk queue for that client.
 107  */
 108 static void http_send_chunk(struct sender_client *sc, struct sender_status *ss,
 109                 long unsigned current_chunk, const char *buf, size_t len,
 110                 const char *header_buf, size_t header_len)
 111 {
 112         int ret;
 113
 114         if (!sc->header_sent && current_chunk) {
 115                 if (header_buf && header_len > 0) {
 116                         ret = queue_chunk_or_shutdown(sc, ss, header_buf, header_len);
 117                         if (ret < 0)
 118                                 goto out;
 119                 }
 120         }
 121         sc->header_sent = 1;
 122         ret = send_queued_chunks(sc->fd, sc->cq);
 123         if (ret < 0) {
 124                 shutdown_client(sc, ss);
 125                 goto out;
 126         }
 127         if (!len)
 128                 goto out;
 129         if (!ret) { /* still data left in the queue */
 130                 ret = queue_chunk_or_shutdown(sc, ss, buf, len);
 131                 goto out;
 132         }
 133         ret = xwrite(sc->fd, buf, len);
 134         if (ret < 0) {
 135                 shutdown_client(sc, ss);
 136                 goto out;
 137         }
 138         if (ret != len)
 139                 ret = queue_chunk_or_shutdown(sc, ss, buf + ret, len - ret);
 140 out:
 141         if (ret < 0)
 142                 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
 143 }
 144
 145 static void http_send(long unsigned current_chunk,
 146         __a_unused long unsigned chunks_sent, const char *buf, size_t len,
 147         const char *header_buf, size_t header_len)
 148 {
 149         struct sender_client *sc, *tmp;
 150
 151         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 152                 struct private_http_sender_data *phsd = sc->private_data;
 153
 154                 if (phsd->status == HTTP_STREAMING)
 155                         http_send_chunk(sc, hss, current_chunk, buf, len,
 156                                    header_buf, header_len);
 157         }
 158 }
 159
 160 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
 161 {
 162         struct sender_client *sc, *tmp;
 163         struct private_http_sender_data *phsd;
 164         int ret;
 165
 166         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 167                 phsd = sc->private_data;
 168                 switch (phsd->status) {
 169                 case HTTP_STREAMING: /* nothing to do */
 170                         break;
 171                 case HTTP_CONNECTED: /* need to recv get request */
 172                         ret = read_pattern(sc->fd, HTTP_GET_MSG, MAXLINE, rfds);
 173                         if (ret < 0)
 174                                 phsd->status = HTTP_INVALID_GET_REQUEST;
 175                         else if (ret > 0) {
 176                                 phsd->status = HTTP_GOT_GET_REQUEST;
 177                                 PARA_INFO_LOG("received get request\n");
 178                         }
 179                         break;
 180                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 181                         phsd->status = HTTP_STREAMING;
 182                         http_send_ok_msg(sc);
 183                         break;
 184                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 185                         if (http_send_err_msg(sc) >= 0)
 186                                 shutdown_client(sc, hss);
 187                         break;
 188                 }
 189         }
 190         sc = accept_sender_client(hss, rfds);
 191         if (!sc)
 192                 return;
 193         phsd = para_malloc(sizeof(*phsd));
 194         sc->private_data = phsd;
 195         phsd->status = HTTP_CONNECTED;
 196 }
 197
 198 static void http_pre_select(int *max_fileno, fd_set *rfds, fd_set *wfds)
 199 {
 200         struct sender_client *sc, *tmp;
 201
 202         if (hss->listen_fd < 0)
 203                 return;
 204         para_fd_set(hss->listen_fd, rfds, max_fileno);
 205         list_for_each_entry_safe(sc, tmp, &hss->client_list, node) {
 206                 struct private_http_sender_data *phsd = sc->private_data;
 207                 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
 208                         para_fd_set(sc->fd, rfds, max_fileno);
 209                 if (phsd->status == HTTP_GOT_GET_REQUEST ||
 210                                 phsd->status == HTTP_INVALID_GET_REQUEST)
 211                         para_fd_set(sc->fd, wfds, max_fileno);
 212         }
 213 }
 214
 215 static int http_com_on(__a_unused struct sender_command_data *scd)
 216 {
 217         return generic_com_on(hss, IPPROTO_TCP);
 218 }
 219
 220 static int http_com_off(__a_unused struct sender_command_data *scd)
 221 {
 222         generic_com_off(hss);
 223         return 1;
 224 }
 225
 226 static int http_com_deny(struct sender_command_data *scd)
 227 {
 228         generic_com_deny(scd, hss);
 229         return 1;
 230 }
 231
 232 static int http_com_allow(struct sender_command_data *scd)
 233 {
 234         generic_com_allow(scd, hss);
 235         return 1;
 236 }
 237
 238 static char *http_info(void)
 239 {
 240         return get_sender_info(hss, "http");
 241 }
 242
 243 /**
 244  * The init function of the http sender.
 245  *
 246  * \param s Pointer to the http sender struct.
 247  *
 248  * It initializes all function pointers of \a s, the client list and the access
 249  * control list. If the autostart option was given, the tcp port is opened.
 250  */
 251 void http_send_init(struct sender *s)
 252 {
 253         int ret;
 254         s->info = http_info;
 255         s->send = http_send;
 256         s->pre_select = http_pre_select;
 257         s->post_select = http_post_select;
 258         s->shutdown_clients = http_shutdown_clients;
 259         s->resolve_target = NULL;
 260         s->help = generic_sender_help;
 261         s->client_cmds[SENDER_ON] = http_com_on;
 262         s->client_cmds[SENDER_OFF] = http_com_off;
 263         s->client_cmds[SENDER_DENY] = http_com_deny;
 264         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 265         s->client_cmds[SENDER_ADD] = NULL;
 266         s->client_cmds[SENDER_DELETE] = NULL;
 267
 268         init_sender_status(hss, conf.http_access_arg, conf.http_access_given,
 269                 conf.http_port_arg, conf.http_max_clients_arg,
 270                 conf.http_default_deny_given);
 271         if (conf.http_no_autostart_given)
 272                 return;
 273         ret = generic_com_on(hss, IPPROTO_TCP);
 274         if (ret < 0)
 275                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 276 }