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
  33 /** The possible states of a client from the server's POV. */
  34 enum http_status {
  35         /** We accepted the connection on the tcp socket. */
  36         HTTP_CONNECTED,
  37         /** Successfully received the get request. */
  38         HTTP_GOT_GET_REQUEST,
  39         /** Connection is ready for sending audio data. */
  40         HTTP_STREAMING,
  41         /** We didn't receive a valid get request. */
  42         HTTP_INVALID_GET_REQUEST
  43 };
  44
  45 /** Clients will be kicked if there are more than that many bytes pending. */
  46 #define MAX_BACKLOG 400000
  47 /** The list of connected clients. */
  48 static struct list_head clients;
  49 /** The whitelist/blacklist. */
  50 static struct list_head http_acl;
  51
  52 static int listen_fd = -1, numclients;
  53
  54 struct private_http_sender_data {
  55         enum http_status status;
  56 };
  57
  58 static int http_send_msg(struct sender_client *sc, const char *msg)
  59 {
  60         int ret = send_buffer(sc->fd, msg);
  61
  62         if (ret < 0)
  63                 shutdown_client(sc);
  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         struct sender_client *sc, *tmp;
  82         list_for_each_entry_safe(sc, tmp, &clients, node)
  83                 shutdown_client(sc);
  84 }
  85
  86 static void http_send(long unsigned current_chunk,
  87         __a_unused long unsigned chunks_sent, const char *buf, size_t len)
  88 {
  89         struct sender_client *sc, *tmp;
  90
  91         list_for_each_entry_safe(sc, tmp, &clients, node) {
  92                 struct private_http_sender_data *phsd = sc->private_data;
  93                 if (phsd->status != HTTP_STREAMING)
  94                         continue;
  95                 send_chunk(sc, 0, current_chunk, buf, len);
  96         }
  97 }
  98
  99 static void http_post_select(fd_set *rfds, __a_unused fd_set *wfds)
 100 {
 101         int ret, match;
 102         struct sender_client *sc, *tmp;
 103         struct private_http_sender_data *phsd;
 104
 105         if (listen_fd < 0)
 106                 return;
 107         list_for_each_entry_safe(sc, tmp, &clients, node) {
 108                 phsd = sc->private_data;
 109                 switch (phsd->status) {
 110                 case HTTP_STREAMING: /* nothing to do */
 111                         break;
 112                 case HTTP_CONNECTED: /* need to recv get request */
 113                         if (FD_ISSET(sc->fd, rfds)) {
 114                                 if (recv_pattern(sc->fd, HTTP_GET_MSG, MAXLINE)
 115                                                 < 0) {
 116                                         phsd->status = HTTP_INVALID_GET_REQUEST;
 117                                 } else {
 118                                         phsd->status = HTTP_GOT_GET_REQUEST;
 119                                         PARA_INFO_LOG("%s",
 120                                                 "received get request\n");
 121                                 }
 122                         }
 123                         break;
 124                 case HTTP_GOT_GET_REQUEST: /* need to send ok msg */
 125                         phsd->status = HTTP_STREAMING;
 126                         http_send_ok_msg(sc);
 127                         break;
 128                 case HTTP_INVALID_GET_REQUEST: /* need to send err msg */
 129                         if (http_send_err_msg(sc) >= 0)
 130                                 shutdown_client(sc);
 131                         break;
 132                 }
 133         }
 134         if (!FD_ISSET(listen_fd, rfds))
 135                 return;
 136         ret = para_accept(listen_fd, NULL, 0);
 137         if (ret < 0) {
 138                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 139                 return;
 140         }
 141         sc = para_calloc(sizeof(*sc));
 142         sc->fd = ret;
 143         sc->name = make_message("%s", remote_name(sc->fd));
 144         PARA_NOTICE_LOG("connection from %s (fd %d)\n", sc->name, sc->fd);
 145         ret = -E_MAX_CLIENTS;
 146         if (conf.http_max_clients_arg > 0 && numclients >=
 147                         conf.http_max_clients_arg) {
 148                 goto err_out;
 149         }
 150         match = acl_lookup(sc->fd, &http_acl);
 151         PARA_DEBUG_LOG("acl lookup returned %d\n", match);
 152         ret = -E_ACL_PERM;
 153         if ((match && !conf.http_default_deny_given) ||
 154                         (!match && conf.http_default_deny_given))
 155                 goto err_out;
 156         ret = mark_fd_nonblocking(sc->fd);
 157         if (ret < 0)
 158                 goto err_out;
 159         phsd = para_malloc(sizeof(*phsd));
 160         sc->private_data = phsd;
 161         phsd->status = HTTP_CONNECTED;
 162         sc->cq = cq_new(MAX_BACKLOG);
 163         numclients++;
 164         PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
 165                 sc->name, sc->fd);
 166         para_list_add(&sc->node, &clients);
 167         add_close_on_fork_list(sc->fd);
 168         return;
 169 err_out:
 170         PARA_WARNING_LOG("%s\n", para_strerror(-ret));
 171         close(sc->fd);
 172         free(sc);
 173 }
 174
 175 static void http_pre_select(int *max_fileno, fd_set *rfds, __a_unused fd_set *wfds)
 176 {
 177         struct sender_client *sc, *tmp;
 178
 179         if (listen_fd < 0)
 180                 return;
 181         para_fd_set(listen_fd, rfds, max_fileno);
 182         list_for_each_entry_safe(sc, tmp, &clients, node) {
 183                 struct private_http_sender_data *phsd = sc->private_data;
 184                 if (phsd->status == HTTP_CONNECTED) /* need to recv get request */
 185                         para_fd_set(sc->fd, rfds, max_fileno);
 186         }
 187 }
 188
 189 static int http_com_on(__a_unused struct sender_command_data *scd)
 190 {
 191         if (listen_fd >= 0)
 192                 return 1;
 193         return open_sender(IPPROTO_TCP, conf.http_port_arg);
 194 }
 195
 196 static int http_com_off(__a_unused struct sender_command_data *scd)
 197 {
 198         if (listen_fd < 0)
 199                 return 1;
 200         PARA_NOTICE_LOG("closing http port %d\n", conf.http_port_arg);
 201         close(listen_fd);
 202         del_close_on_fork_list(listen_fd);
 203         http_shutdown_clients();
 204         listen_fd = -1;
 205         return 1;
 206 }
 207
 208 static int http_com_deny(struct sender_command_data *scd)
 209 {
 210         if (conf.http_default_deny_given)
 211                 acl_del_entry(&http_acl, scd->addr, scd->netmask);
 212         else
 213                 acl_add_entry(&http_acl, scd->addr, scd->netmask);
 214         return 1;
 215 }
 216
 217 static int http_com_allow(struct sender_command_data *scd)
 218 {
 219         if (conf.http_default_deny_given)
 220                 acl_add_entry(&http_acl, scd->addr, scd->netmask);
 221         else
 222                 acl_del_entry(&http_acl, scd->addr, scd->netmask);
 223         return 1;
 224 }
 225
 226 static char *http_info(void)
 227 {
 228         char *clnts = NULL, *ret;
 229         struct sender_client *sc, *tmp_sc;
 230
 231         char *acl_contents = acl_get_contents(&http_acl);
 232         list_for_each_entry_safe(sc, tmp_sc, &clients, node) {
 233                 char *tmp = make_message("%s%s ", clnts? clnts : "", sc->name);
 234                 free(clnts);
 235                 clnts = tmp;
 236         }
 237         ret = make_message(
 238                 "http status: %s\n"
 239                 "http tcp port: %d\n"
 240                 "http clients: %d\n"
 241                 "http maximal number of clients: %d%s\n"
 242                 "http connected clients: %s\n"
 243                 "http access %s list: %s\n",
 244                 (listen_fd >= 0)? "on" : "off",
 245                 conf.http_port_arg,
 246                 numclients,
 247                 conf.http_max_clients_arg,
 248                 conf.http_max_clients_arg > 0? "" : " (unlimited)",
 249                 clnts? clnts : "(none)",
 250                 conf.http_default_deny_given? "allow" : "deny",
 251                 acl_contents? acl_contents : "(none)"
 252         );
 253         free(acl_contents);
 254         free(clnts);
 255         return ret;
 256 }
 257
 258 static char *http_help(void)
 259 {
 260         return make_message(
 261                 "usage: {on|off}\n"
 262                 "usage: {allow|deny} IP mask\n"
 263                 "example: allow 127.0.0.1 32\n"
 264         );
 265 }
 266
 267 /**
 268  * The init function of the http sender.
 269  *
 270  * \param s Pointer to the http sender struct.
 271  *
 272  * It initializes all function pointers of \a s, the client list and the access
 273  * control list. If the autostart option was given, the tcp port is opened.
 274  */
 275 void http_send_init(struct sender *s)
 276 {
 277         int ret;
 278         INIT_LIST_HEAD(&clients);
 279         s->info = http_info;
 280         s->send = http_send;
 281         s->pre_select = http_pre_select;
 282         s->post_select = http_post_select;
 283         s->shutdown_clients = http_shutdown_clients;
 284         s->help = http_help;
 285         s->client_cmds[SENDER_ON] = http_com_on;
 286         s->client_cmds[SENDER_OFF] = http_com_off;
 287         s->client_cmds[SENDER_DENY] = http_com_deny;
 288         s->client_cmds[SENDER_ALLOW] = http_com_allow;
 289         s->client_cmds[SENDER_ADD] = NULL;
 290         s->client_cmds[SENDER_DELETE] = NULL;
 291         acl_init(&http_acl, conf.http_access_arg, conf.http_access_given);
 292         if (conf.http_no_autostart_given)
 293                 return;
 294         ret = open_sender(IPPROTO_TCP, conf.http_port_arg);
 295         if (ret < 0)
 296                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 297         else
 298                 listen_fd = ret;
 299 }