git.meshlink.io Git - meshlink/blob - src/meta.c

   1 /*
   2     meta.c -- handle the meta communication
   3     Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>,
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "system.h"
  21
  22 #include "cipher.h"
  23 #include "connection.h"
  24 #include "logger.h"
  25 #include "meta.h"
  26 #include "net.h"
  27 #include "protocol.h"
  28 #include "utils.h"
  29 #include "xalloc.h"
  30
  31 bool send_meta_sptps(void *handle, uint8_t type, const char *buffer, size_t length) {
  32         connection_t *c = handle;
  33
  34         if(!c) {
  35                 logger(DEBUG_ALWAYS, LOG_ERR, "send_meta_sptps() called with NULL pointer!");
  36                 abort();
  37         }
  38
  39         buffer_add(&c->outbuf, buffer, length);
  40         io_set(&c->io, IO_READ | IO_WRITE);
  41
  42         return true;
  43 }
  44
  45 bool send_meta(connection_t *c, const char *buffer, int length) {
  46         if(!c) {
  47                 logger(DEBUG_ALWAYS, LOG_ERR, "send_meta() called with NULL pointer!");
  48                 abort();
  49         }
  50
  51         logger(DEBUG_META, LOG_DEBUG, "Sending %d bytes of metadata to %s (%s)", length,
  52                            c->name, c->hostname);
  53
  54         if(c->allow_request == ID) {
  55                 buffer_add(&c->outbuf, buffer, length);
  56                 io_set(&c->io, IO_READ | IO_WRITE);
  57                 return true;
  58         }
  59
  60         return sptps_send_record(&c->sptps, 0, buffer, length);
  61 }
  62
  63 void broadcast_meta(connection_t *from, const char *buffer, int length) {
  64         for list_each(connection_t, c, connection_list)
  65                 if(c != from && c->status.active)
  66                         send_meta(c, buffer, length);
  67 }
  68
  69 bool receive_meta_sptps(void *handle, uint8_t type, const char *data, uint16_t length) {
  70         connection_t *c = handle;
  71
  72         if(!c) {
  73                 logger(DEBUG_ALWAYS, LOG_ERR, "receive_meta_sptps() called with NULL pointer!");
  74                 abort();
  75         }
  76
  77         if(type == SPTPS_HANDSHAKE) {
  78                 if(c->allow_request == ACK)
  79                         return send_ack(c);
  80                 else
  81                         return true;
  82         }
  83
  84         if(!data)
  85                 return true;
  86
  87         /* Are we receiving a TCPpacket? */
  88
  89         if(c->tcplen) {
  90                 if(length != c->tcplen)
  91                         return false;
  92                 receive_tcppacket(c, data, length);
  93                 c->tcplen = 0;
  94                 return true;
  95         }
  96
  97         /* Change newline to null byte, just like non-SPTPS requests */
  98
  99         if(data[length - 1] == '\n')
 100                 ((char *)data)[length - 1] = 0;
 101
 102         /* Otherwise we are waiting for a request */
 103
 104         return receive_request(c, data);
 105 }
 106
 107 bool receive_meta(connection_t *c) {
 108         int inlen;
 109         char inbuf[MAXBUFSIZE];
 110         char *bufp = inbuf, *endp;
 111
 112         /* Strategy:
 113            - Read as much as possible from the TCP socket in one go.
 114            - Decrypt it.
 115            - Check if a full request is in the input buffer.
 116            - If yes, process request and remove it from the buffer,
 117            then check again.
 118            - If not, keep stuff in buffer and exit.
 119          */
 120
 121         buffer_compact(&c->inbuf, MAXBUFSIZE);
 122
 123         if(sizeof inbuf <= c->inbuf.len) {
 124                 logger(DEBUG_ALWAYS, LOG_ERR, "Input buffer full for %s (%s)", c->name, c->hostname);
 125                 return false;
 126         }
 127
 128         inlen = recv(c->socket, inbuf, sizeof inbuf - c->inbuf.len, 0);
 129
 130         if(inlen <= 0) {
 131                 if(!inlen || !errno) {
 132                         logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)",
 133                                            c->name, c->hostname);
 134                 } else if(sockwouldblock(sockerrno))
 135                         return true;
 136                 else
 137                         logger(DEBUG_ALWAYS, LOG_ERR, "Metadata socket read error for %s (%s): %s",
 138                                    c->name, c->hostname, sockstrerror(sockerrno));
 139                 return false;
 140         }
 141
 142         if(c->allow_request == ID) {
 143                 endp = memchr(bufp, '\n', inlen);
 144                 if(endp)
 145                         endp++;
 146                 else
 147                         endp = bufp + inlen;
 148
 149                 buffer_add(&c->inbuf, bufp, endp - bufp);
 150
 151                 inlen -= endp - bufp;
 152                 bufp = endp;
 153
 154                 while(c->inbuf.len) {
 155                         char *request = buffer_readline(&c->inbuf);
 156                         if(request) {
 157                                 bool result = receive_request(c, request);
 158                                 if(!result)
 159                                         return false;
 160                                 continue;
 161                         } else {
 162                                 break;
 163                         }
 164                 }
 165
 166                 return true;
 167         }
 168
 169         return sptps_receive_data(&c->sptps, bufp, inlen);
 170 }