diff options
| -rw-r--r-- | source3/lib/interfaces.c | 401 |
1 files changed, 401 insertions, 0 deletions
diff --git a/source3/lib/interfaces.c b/source3/lib/interfaces.c new file mode 100644 index 0000000000..29181c394a --- /dev/null +++ b/source3/lib/interfaces.c @@ -0,0 +1,401 @@ +/* + Unix SMB/Netbios implementation. + Version 2.0 + return a list of network interfaces + Copyright (C) Andrew Tridgell 1998 + + This program 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 of the License, or + (at your option) any later version. + + This program 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. +*/ + + +/* working out the interfaces for a OS is an incredibly non-portable + thing. We have several possible implementations below, and autoconf + tries each of them to see what works + + Note that this file does _not_ include includes.h. That is so this code + can be called directly from the autoconf tests. That also means + this code cannot use any of the normal Samba debug stuff or defines. + This is standalone code. + +*/ + +#include <unistd.h> +#include <stdio.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <netdb.h> +#include <sys/ioctl.h> +#include <net/if.h> + +#ifndef SIOCGIFCONF +#include <sys/sockio.h> +#endif + +#ifdef AUTOCONF_TEST +struct iface_struct { + char name[16]; + struct in_addr ip; + struct in_addr netmask; +}; +#else +#include "config.h" +#include "interfaces.h" +#endif + +#ifdef HAVE_STDLIB_H +#include <stdlib.h> +#endif + +#ifdef HAVE_STRING_H +#include <string.h> +#endif + +#ifdef HAVE_STRINGS_H +#include <strings.h> +#endif + +#ifdef __COMPAR_FN_T +#define QSORT_CAST (__compar_fn_t) +#endif + +#ifndef QSORT_CAST +#define QSORT_CAST (int (*)(const void *, const void *)) +#endif + +#if HAVE_IFACE_IFCONF + +/* this works for Linux 2.2, Solaris 2.5, SunOS4, HPUX 10.20, OSF1 + V4.0, Ultrix 4.4, SCO Unix 3.2, IRIX 6.4 and FreeBSD 3.2. + + It probably also works on any BSD style system. */ + +/**************************************************************************** + get the netmask address for a local interface +****************************************************************************/ +static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces) +{ + struct ifconf ifc; + char buff[8192]; + int fd, i, n; + struct ifreq *ifr=NULL; + int total = 0; + struct in_addr ipaddr; + struct in_addr nmask; + char *iname; + + if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { + return -1; + } + + ifc.ifc_len = sizeof(buff); + ifc.ifc_buf = buff; + + if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) { + close(fd); + return -1; + } + + ifr = ifc.ifc_req; + + n = ifc.ifc_len / sizeof(struct ifreq); + + /* Loop through interfaces, looking for given IP address */ + for (i=n-1;i>=0 && total < max_interfaces;i--) { + if (ioctl(fd, SIOCGIFADDR, &ifr[i]) != 0) { + continue; + } + + iname = ifr[i].ifr_name; + ipaddr = (*(struct sockaddr_in *)&ifr[i].ifr_addr).sin_addr; + + if (ioctl(fd, SIOCGIFFLAGS, &ifr[i]) != 0) { + continue; + } + + if (!(ifr[i].ifr_flags & IFF_UP)) { + continue; + } + + if (ioctl(fd, SIOCGIFNETMASK, &ifr[i]) != 0) { + continue; + } + + nmask = ((struct sockaddr_in *)&ifr[i].ifr_addr)->sin_addr; + + strncpy(ifaces[total].name, iname, sizeof(ifaces[total].name)-1); + ifaces[total].name[sizeof(ifaces[total].name)-1] = 0; + ifaces[total].ip = ipaddr; + ifaces[total].netmask = nmask; + total++; + } + + close(fd); + + return total; +} + +#elif HAVE_IFACE_IFREQ + +#ifndef I_STR +#include <sys/stropts.h> +#endif + +/**************************************************************************** +this should cover most of the streams based systems +Thanks to Andrej.Borsenkow@mow.siemens.ru for several ideas in this code +****************************************************************************/ +static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces) +{ + struct ifreq ifreq; + struct strioctl strioctl; + char buff[8192]; + int fd, i, n; + struct ifreq *ifr=NULL; + int total = 0; + struct in_addr ipaddr; + struct in_addr nmask; + char *iname; + + if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { + return -1; + } + + strioctl.ic_cmd = SIOCGIFCONF; + strioctl.ic_dp = buff; + strioctl.ic_len = sizeof(buff); + if (ioctl(fd, I_STR, &strioctl) < 0) { + close(fd); + return -1; + } + + /* we can ignore the possible sizeof(int) here as the resulting + number of interface structures won't change */ + n = strioctl.ic_len / sizeof(struct ifreq); + + /* we will assume that the kernel returns the length as an int + at the start of the buffer if the offered size is a + multiple of the structure size plus an int */ + if (n*sizeof(struct ifreq) + sizeof(int) == strioctl.ic_len) { + ifr = (struct ifreq *)(buff + sizeof(int)); + } else { + ifr = (struct ifreq *)buff; + } + + /* Loop through interfaces */ + + for (i = 0; i<n && total < max_interfaces; i++) { + ifreq = ifr[i]; + + strioctl.ic_cmd = SIOCGIFFLAGS; + strioctl.ic_dp = (char *)&ifreq; + strioctl.ic_len = sizeof(struct ifreq); + if (ioctl(fd, I_STR, &strioctl) != 0) { + continue; + } + + if (!(ifreq.ifr_flags & IFF_UP)) { + continue; + } + + strioctl.ic_cmd = SIOCGIFADDR; + strioctl.ic_dp = (char *)&ifreq; + strioctl.ic_len = sizeof(struct ifreq); + if (ioctl(fd, I_STR, &strioctl) != 0) { + continue; + } + + ipaddr = (*(struct sockaddr_in *) &ifreq.ifr_addr).sin_addr; + iname = ifreq.ifr_name; + + strioctl.ic_cmd = SIOCGIFNETMASK; + strioctl.ic_dp = (char *)&ifreq; + strioctl.ic_len = sizeof(struct ifreq); + if (ioctl(fd, I_STR, &strioctl) != 0) { + continue; + } + + nmask = ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr; + + strncpy(ifaces[total].name, iname, sizeof(ifaces[total].name)-1); + ifaces[total].name[sizeof(ifaces[total].name)-1] = 0; + ifaces[total].ip = ipaddr; + ifaces[total].netmask = nmask; + + total++; + } + + close(fd); + + return total; +} + +#elif HAVE_IFACE_AIX + +/**************************************************************************** +this one is for AIX (tested on 4.2) +****************************************************************************/ +static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces) +{ + char buff[8192]; + int fd, i; + struct ifconf ifc; + struct ifreq *ifr=NULL; + struct in_addr ipaddr; + struct in_addr nmask; + char *iname; + int total = 0; + + if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { + return -1; + } + + + ifc.ifc_len = sizeof(buff); + ifc.ifc_buf = buff; + + if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) { + close(fd); + return -1; + } + + ifr = ifc.ifc_req; + + /* Loop through interfaces */ + i = ifc.ifc_len; + + while (i > 0 && total < max_interfaces) { + unsigned inc; + + inc = ifr->ifr_addr.sa_len; + + if (ioctl(fd, SIOCGIFADDR, ifr) != 0) { + goto next; + } + + ipaddr = (*(struct sockaddr_in *) &ifr->ifr_addr).sin_addr; + iname = ifr->ifr_name; + + if (ioctl(fd, SIOCGIFFLAGS, ifr) != 0) { + goto next; + } + + if (!(ifr->ifr_flags & IFF_UP)) { + goto next; + } + + if (ioctl(fd, SIOCGIFNETMASK, ifr) != 0) { + goto next; + } + + nmask = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; + + strncpy(ifaces[total].name, iname, sizeof(ifaces[total].name)-1); + ifaces[total].name[sizeof(ifaces[total].name)-1] = 0; + ifaces[total].ip = ipaddr; + ifaces[total].netmask = nmask; + + total++; + + next: + /* + * Patch from Archie Cobbs (archie@whistle.com). The + * addresses in the SIOCGIFCONF interface list have a + * minimum size. Usually this doesn't matter, but if + * your machine has tunnel interfaces, etc. that have + * a zero length "link address", this does matter. */ + + if (inc < sizeof(ifr->ifr_addr)) + inc = sizeof(ifr->ifr_addr); + inc += IFNAMSIZ; + + ifr = (struct ifreq*) (((char*) ifr) + inc); + i -= inc; + } + + + close(fd); + return total; +} + +#else /* a dummy version */ +static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces) +{ + return -1; +} +#endif + + +static int iface_comp(struct iface_struct *i1, struct iface_struct *i2) +{ + int r; + r = strcmp(i1->name, i2->name); + if (r) return r; + r = ntohl(i1->ip.s_addr) - ntohl(i2->ip.s_addr); + if (r) return r; + r = ntohl(i1->netmask.s_addr) - ntohl(i2->netmask.s_addr); + return r; +} + +/* this wrapper is used to remove duplicates from the interface list generated + above */ +int get_interfaces(struct iface_struct *ifaces, int max_interfaces) +{ + int total, i, j; + + total = _get_interfaces(ifaces, max_interfaces); + if (total <= 0) return total; + + /* now we need to remove duplicates */ + qsort(ifaces, total, sizeof(ifaces[0]), QSORT_CAST iface_comp); + + for (i=1;i<total;) { + if (iface_comp(&ifaces[i-1], &ifaces[i]) == 0) { + for (j=i-1;j<total-1;j++) { + ifaces[j] = ifaces[j+1]; + } + total--; + } else { + i++; + } + } + + return total; +} + + +#ifdef AUTOCONF_TEST +/* this is the autoconf driver to test get_interfaces() */ + +#define MAX_INTERFACES 128 + + int main() +{ + struct iface_struct ifaces[MAX_INTERFACES]; + int total = get_interfaces(ifaces, MAX_INTERFACES); + int i; + + printf("got %d interfaces:\n", total); + if (total <= 0) exit(1); + + for (i=0;i<total;i++) { + printf("%-10s ", ifaces[i].name); + printf("IP=%s ", inet_ntoa(ifaces[i].ip)); + printf("NETMASK=%s\n", inet_ntoa(ifaces[i].netmask)); + } + return 0; +} +#endif |