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Diffstat (limited to '')
-rw-r--r-- | plugin_netinfo.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/plugin_netinfo.c b/plugin_netinfo.c new file mode 100644 index 0000000..143a5e1 --- /dev/null +++ b/plugin_netinfo.c @@ -0,0 +1,227 @@ +/* $Id: $ + * $URL: $ + * + * plugin getting information about network devices (IPaddress, MACaddress, ...) + * + * Copyright (C) 2007 Volker Gering <v.gering@t-online.de> + * Copyright (C) 2004, 2005, 2006, 2007 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> + * + * This file is part of LCD4Linux. + * + * LCD4Linux is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * LCD4Linux is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +/* + * exported functions: + * + * int plugin_init_netinfo (void) + * adds functions to get information about network devices + * + */ + + +#include "config.h" + +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <ctype.h> + +#include "debug.h" +#include "plugin.h" +#include "qprintf.h" + +#include <sys/types.h> /* socket() */ +#include <sys/socket.h> /* socket() */ +#include <sys/ioctl.h> /* SIOCGIFNAME */ +#include <net/if.h> /* ifreq{} */ +#include <errno.h> /* errno */ +#include <netinet/in.h> /* inet_ntoa() */ +#include <arpa/inet.h> /* inet_ntoa() */ + + +/* socket descriptor: + * -2 initial state + * -1 error: message not printed + * -3 error: message printed, deactivate plugin + */ +static int socknr = -2; + +static int open_net(void) +{ + + if (socknr == -3) + return -1; + if (socknr == -2) { + socknr = socket(PF_INET, SOCK_STREAM, 0); + } + if (socknr == -1) { + error("%s: socket(PF_INET, SOCK_STREAM, 0) failed: %s", "plugin_netinfo", strerror(errno)); + error(" deactivate plugin netinfo"); + socknr = -3; + return -1; + } + + return 0; +} + + +static void my_exists(RESULT * result, RESULT * arg1) +{ + struct ifreq ifreq; + double value = 1.0; + + if (socknr < 0) { + /* no open socket */ + value = 0.0; + SetResult(&result, R_NUMBER, &value); + return; + } + + strncpy(ifreq.ifr_name, R2S(arg1), sizeof(ifreq.ifr_name)); + if (ioctl(socknr, SIOCGIFFLAGS, &ifreq) < 0) { + if (errno == ENODEV) { + /* device does not exists */ + value = 0.0; + } else { + error("%s: ioctl(FLAGS) failed: %s", "plugin_netinfo", strerror(errno)); + return; + } + } + + /* device exists */ + SetResult(&result, R_NUMBER, &value); +} + + +/* get MAC address (hardware address) of network device */ +static void my_hwaddr(RESULT * result, RESULT * arg1) +{ + struct ifreq ifreq; + unsigned char *hw; + char value[18]; + + if (socknr < 0) { + /* no open socket */ + SetResult(&result, R_STRING, ""); + return; + } + + strncpy(ifreq.ifr_name, R2S(arg1), sizeof(ifreq.ifr_name)); + if (ioctl(socknr, SIOCGIFHWADDR, &ifreq) < 0) { + error("%s: ioctl(IFHWADDR) failed: %s", "plugin_netinfo", strerror(errno)); + return; + } + hw = (unsigned char *) ifreq.ifr_hwaddr.sa_data; + qprintf(value, sizeof(value), "%02x:%02x:%02x:%02x:%02x:%02x", + *hw, *(hw + 1), *(hw + 2), *(hw + 3), *(hw + 4), *(hw + 5)); + + SetResult(&result, R_STRING, value); +} + + +/* get ip address of network device */ +static void my_ipaddr(RESULT * result, RESULT * arg1) +{ + struct ifreq ifreq; + struct sockaddr_in *sin; + char value[16]; + + if (socknr < 0) { + /* no open socket */ + SetResult(&result, R_STRING, ""); + return; + } + + strncpy(ifreq.ifr_name, R2S(arg1), sizeof(ifreq.ifr_name)); + if (ioctl(socknr, SIOCGIFADDR, &ifreq) < 0) { + error("%s: ioctl(IFADDR) failed: %s", "plugin_netinfo", strerror(errno)); + return; + } + sin = (struct sockaddr_in *) &ifreq.ifr_addr; + qprintf(value, sizeof(value), "%s", inet_ntoa(sin->sin_addr)); + + SetResult(&result, R_STRING, value); +} + + +/* get ip netmask of network device */ +static void my_netmask(RESULT * result, RESULT * arg1) +{ + struct ifreq ifreq; + struct sockaddr_in *sin; + char value[16]; + + if (socknr < 0) { + /* no open socket */ + SetResult(&result, R_STRING, ""); + return; + } + + strncpy(ifreq.ifr_name, R2S(arg1), sizeof(ifreq.ifr_name)); + if (ioctl(socknr, SIOCGIFNETMASK, &ifreq) < 0) { + error("%s: ioctl(IFNETMASK) failed: %s", "plugin_netinfo", strerror(errno)); + return; + } + sin = (struct sockaddr_in *) &ifreq.ifr_netmask; + qprintf(value, sizeof(value), "%s", inet_ntoa(sin->sin_addr)); + + SetResult(&result, R_STRING, value); +} + + +/* get ip broadcast address of network device */ +static void my_bcaddr(RESULT * result, RESULT * arg1) +{ + struct ifreq ifreq; + struct sockaddr_in *sin; + char value[16]; + + if (socknr < 0) { + /* no open socket */ + SetResult(&result, R_STRING, ""); + return; + } + + strncpy(ifreq.ifr_name, R2S(arg1), sizeof(ifreq.ifr_name)); + if (ioctl(socknr, SIOCGIFBRDADDR, &ifreq) < 0) { + error("%s: ioctl(IFBRDADDR) failed: %s", "plugin_netinfo", strerror(errno)); + return; + } + sin = (struct sockaddr_in *) &ifreq.ifr_broadaddr; + qprintf(value, sizeof(value), "%s", inet_ntoa(sin->sin_addr)); + + SetResult(&result, R_STRING, value); +} + + +int plugin_init_netinfo(void) +{ + open_net(); + + AddFunction("netinfo::exists", 1, my_exists); + AddFunction("netinfo::hwaddr", 1, my_hwaddr); + AddFunction("netinfo::ipaddr", 1, my_ipaddr); + AddFunction("netinfo::netmask", 1, my_netmask); + AddFunction("netinfo::bcaddr", 1, my_bcaddr); + + return 0; +} + +void plugin_exit_netinfo(void) +{ + close(socknr); +} |