mbed official / WiflyInterface

WiflyInterface

Dependents:   test_over_wifly

Fork of WiflyInterface by mbed official

Socket/UDPSocket.cpp@9:c77799a03294, 2014-01-28 (annotated)

Committer:
Bogdan Marinescu
Date:
Tue Jan 28 11:00:48 2014 +0200
Revision:
9:c77799a03294
Parent:
4:0bcec6272784 
Address various potential buffer overflow issues



https://mbed.org/comments/cr/93/4779/#c8499

Who changed what in which revision?

UserRevisionLine numberNew contents of line
samux 1:fb4494783863 1 /* Copyright (C) 2012 mbed.org, MIT License
samux 1:fb4494783863 2 *
samux 1:fb4494783863 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
samux 1:fb4494783863 4 * and associated documentation files (the "Software"), to deal in the Software without restriction,
samux 1:fb4494783863 5 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
samux 1:fb4494783863 6 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
samux 1:fb4494783863 7 * furnished to do so, subject to the following conditions:
samux 1:fb4494783863 8 *
samux 1:fb4494783863 9 * The above copyright notice and this permission notice shall be included in all copies or
samux 1:fb4494783863 10 * substantial portions of the Software.
samux 1:fb4494783863 11 *
samux 1:fb4494783863 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
samux 1:fb4494783863 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
samux 1:fb4494783863 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
samux 1:fb4494783863 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
samux 1:fb4494783863 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
samux 1:fb4494783863 17 */
samux 1:fb4494783863 18
samux 1:fb4494783863 19 #include "UDPSocket.h"
samux 1:fb4494783863 20
samux 1:fb4494783863 21 #include <string>
samux 1:fb4494783863 22 #include <algorithm>
samux 1:fb4494783863 23
samux 1:fb4494783863 24 UDPSocket::UDPSocket()
samux 1:fb4494783863 25 {
samux 1:fb4494783863 26 endpoint_configured = false;
samux 1:fb4494783863 27 endpoint_read = false;
samux 1:fb4494783863 28 }
samux 1:fb4494783863 29
samux 1:fb4494783863 30 int UDPSocket::init(void)
samux 1:fb4494783863 31 {
samux 1:fb4494783863 32 wifi->setProtocol(UDP);
samux 1:fb4494783863 33 wifi->exit();
samux 1:fb4494783863 34 return 0;
samux 1:fb4494783863 35 }
samux 1:fb4494783863 36
samux 1:fb4494783863 37 // Server initialization
samux 1:fb4494783863 38 int UDPSocket::bind(int port)
samux 1:fb4494783863 39 {
samux 1:fb4494783863 40 char cmd[17];
samux 1:fb4494783863 41
samux 1:fb4494783863 42 // set local port
samux 1:fb4494783863 43 sprintf(cmd, "set i l %d\r", port);
samux 1:fb4494783863 44 if (!wifi->sendCommand(cmd, "AOK"))
samux 1:fb4494783863 45 return -1;
samux 4:0bcec6272784 46
samux 4:0bcec6272784 47 // save
samux 4:0bcec6272784 48 if (!wifi->sendCommand("save\r", "Stor"))
samux 4:0bcec6272784 49 return -1;
samux 4:0bcec6272784 50
samux 4:0bcec6272784 51 // reboot
samux 4:0bcec6272784 52 wifi->reboot();
samux 4:0bcec6272784 53
samux 4:0bcec6272784 54 // set udp protocol
samux 4:0bcec6272784 55 wifi->setProtocol(UDP);
samux 4:0bcec6272784 56
samux 4:0bcec6272784 57 // connect the network
samux 4:0bcec6272784 58 if (wifi->isDHCP()) {
samux 4:0bcec6272784 59 if (!wifi->sendCommand("join\r", "DHCP=ON", NULL, 10000))
samux 4:0bcec6272784 60 return -1;
samux 4:0bcec6272784 61 } else {
samux 4:0bcec6272784 62 if (!wifi->sendCommand("join\r", "Associated", NULL, 10000))
samux 4:0bcec6272784 63 return -1;
samux 4:0bcec6272784 64 }
samux 4:0bcec6272784 65
samux 4:0bcec6272784 66 // exit
samux 1:fb4494783863 67 wifi->exit();
samux 4:0bcec6272784 68 wifi->flush();
samux 1:fb4494783863 69 return 0;
samux 1:fb4494783863 70 }
samux 1:fb4494783863 71
samux 1:fb4494783863 72 // -1 if unsuccessful, else number of bytes written
samux 1:fb4494783863 73 int UDPSocket::sendTo(Endpoint &remote, char *packet, int length)
samux 1:fb4494783863 74 {
samux 1:fb4494783863 75 Timer tmr;
samux 1:fb4494783863 76 int idx = 0;
samux 1:fb4494783863 77
samux 1:fb4494783863 78 confEndpoint(remote);
samux 1:fb4494783863 79
samux 1:fb4494783863 80 tmr.start();
samux 1:fb4494783863 81
samux 1:fb4494783863 82 while ((tmr.read_ms() < _timeout) || _blocking) {
samux 1:fb4494783863 83
samux 1:fb4494783863 84 idx += wifi->send(packet, length);
samux 1:fb4494783863 85
samux 1:fb4494783863 86 if (idx == length)
samux 1:fb4494783863 87 return idx;
samux 1:fb4494783863 88 }
samux 1:fb4494783863 89 return (idx == 0) ? -1 : idx;
samux 1:fb4494783863 90 }
samux 1:fb4494783863 91
samux 1:fb4494783863 92 // -1 if unsuccessful, else number of bytes received
samux 1:fb4494783863 93 int UDPSocket::receiveFrom(Endpoint &remote, char *buffer, int length)
samux 1:fb4494783863 94 {
samux 1:fb4494783863 95 Timer tmr;
samux 1:fb4494783863 96 int idx = 0;
samux 1:fb4494783863 97 int nb_available = 0;
samux 1:fb4494783863 98 int time = -1;
samux 1:fb4494783863 99
samux 1:fb4494783863 100 if (_blocking) {
samux 1:fb4494783863 101 while (1) {
samux 1:fb4494783863 102 nb_available = wifi->readable();
samux 1:fb4494783863 103 if (nb_available != 0) {
samux 1:fb4494783863 104 break;
samux 1:fb4494783863 105 }
samux 1:fb4494783863 106 }
samux 1:fb4494783863 107 }
samux 1:fb4494783863 108
samux 1:fb4494783863 109 tmr.start();
samux 1:fb4494783863 110
samux 1:fb4494783863 111 while (time < _timeout) {
samux 1:fb4494783863 112
samux 1:fb4494783863 113 nb_available = wifi->readable();
samux 1:fb4494783863 114 for (int i = 0; i < min(nb_available, length); i++) {
samux 1:fb4494783863 115 buffer[idx] = wifi->getc();
samux 1:fb4494783863 116 idx++;
samux 1:fb4494783863 117 }
samux 1:fb4494783863 118
samux 1:fb4494783863 119 if (idx == length) {
samux 1:fb4494783863 120 break;
samux 1:fb4494783863 121 }
samux 1:fb4494783863 122
samux 1:fb4494783863 123 time = tmr.read_ms();
samux 1:fb4494783863 124 }
samux 1:fb4494783863 125
samux 1:fb4494783863 126 readEndpoint(remote);
samux 1:fb4494783863 127 return (idx == 0) ? -1 : idx;
samux 1:fb4494783863 128 }
samux 1:fb4494783863 129
samux 1:fb4494783863 130 bool UDPSocket::confEndpoint(Endpoint & ep)
samux 1:fb4494783863 131 {
samux 1:fb4494783863 132 char * host;
samux 1:fb4494783863 133 char cmd[30];
samux 1:fb4494783863 134 if (!endpoint_configured) {
samux 1:fb4494783863 135 host = ep.get_address();
samux 1:fb4494783863 136 if (host[0] != '\0') {
samux 1:fb4494783863 137 // set host
samux 1:fb4494783863 138 sprintf(cmd, "set i h %s\r", host);
samux 1:fb4494783863 139 if (!wifi->sendCommand(cmd, "AOK"))
samux 1:fb4494783863 140 return false;
samux 1:fb4494783863 141
samux 1:fb4494783863 142 // set remote port
samux 1:fb4494783863 143 sprintf(cmd, "set i r %d\r", ep.get_port());
samux 1:fb4494783863 144 if (!wifi->sendCommand(cmd, "AOK"))
samux 1:fb4494783863 145 return false;
samux 1:fb4494783863 146
samux 1:fb4494783863 147 wifi->exit();
samux 1:fb4494783863 148 endpoint_configured = true;
samux 1:fb4494783863 149 return true;
samux 1:fb4494783863 150 }
samux 1:fb4494783863 151 }
samux 1:fb4494783863 152 return true;
samux 1:fb4494783863 153 }
samux 1:fb4494783863 154
samux 1:fb4494783863 155 bool UDPSocket::readEndpoint(Endpoint & ep)
samux 1:fb4494783863 156 {
samux 1:fb4494783863 157 char recv[256];
samux 1:fb4494783863 158 int begin = 0;
samux 1:fb4494783863 159 int end = 0;
samux 1:fb4494783863 160 string str;
samux 1:fb4494783863 161 string addr;
samux 1:fb4494783863 162 int port;
samux 1:fb4494783863 163 if (!endpoint_read) {
samux 1:fb4494783863 164 if (!wifi->sendCommand("get ip\r", NULL, recv))
samux 1:fb4494783863 165 return false;
samux 1:fb4494783863 166 wifi->exit();
samux 1:fb4494783863 167 str = recv;
samux 1:fb4494783863 168 begin = str.find("HOST=");
samux 1:fb4494783863 169 end = str.find("PROTO=");
samux 1:fb4494783863 170 if (begin != string::npos && end != string::npos) {
samux 1:fb4494783863 171 str = str.substr(begin + 5, end - begin - 5);
samux 1:fb4494783863 172 int pos = str.find(":");
samux 1:fb4494783863 173 if (pos != string::npos) {
samux 1:fb4494783863 174 addr = str.substr(0, pos);
samux 1:fb4494783863 175 port = atoi(str.substr(pos + 1).c_str());
samux 1:fb4494783863 176 ep.set_address(addr.c_str(), port);
samux 1:fb4494783863 177 endpoint_read = true;
samux 1:fb4494783863 178 wifi->flush();
samux 1:fb4494783863 179 return true;
samux 1:fb4494783863 180 }
samux 1:fb4494783863 181 }
samux 1:fb4494783863 182 wifi->flush();
samux 1:fb4494783863 183 }
samux 1:fb4494783863 184 return false;
samux 1:fb4494783863 185 }