diff options
| -rw-r--r-- | ChangeLog | 26 | ||||
| -rw-r--r-- | inet/Makefile | 8 | ||||
| -rw-r--r-- | inet/Versions | 6 | ||||
| -rw-r--r-- | inet/ifaddrs.h | 74 | ||||
| -rw-r--r-- | inet/test-ifaddrs.c | 82 | ||||
| -rw-r--r-- | resolv/res_hconf.c | 7 | ||||
| -rw-r--r-- | sysdeps/generic/ifaddrs.c | 44 | ||||
| -rw-r--r-- | sysdeps/generic/ifreq.h | 18 | ||||
| -rw-r--r-- | sysdeps/gnu/ifaddrs.c | 147 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/ifreq.h | 74 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/ifreq.h | 21 |
11 files changed, 485 insertions, 22 deletions
@@ -1,5 +1,31 @@ 2002-07-24 Roland McGrath <roland@frob.com> + Added <ifaddrs.h> interface with functions `getifaddrs', `freeifaddrs'. + This implementation supports only IPv4. + * inet/ifaddrs.h: New file. + * sysdeps/generic/ifaddrs.c: New file. + * sysdeps/gnu/ifaddrs.c: New file. + * inet/test-ifaddrs.c: New file. + * inet/Makefile (routines): Add ifaddrs. + (headers): Add ifaddrs.h here. + (tests): Add test-ifaddrs. + * inet/Versions (GLIBC_2.3): New set, add getifaddrs and freeifaddrs. + + * resolv/res_hconf.c (_res_hconf_reorder_addrs): Use an explicit + socket call to get an AF_INET socket, instead of using __opensock. + The SIOCGIFNETMASK ioctl will work only with a PF_INET socket. + + * sysdeps/generic/ifreq.h (__ifreq): Take third argument SOCKFD, + if not -1 use it instead of calling __opensock. + * sysdeps/unix/sysv/linux/ifreq.h (__ifreq): Likewise. + * sysdeps/mach/hurd/ifreq.h (__ifreq): Take new argument and ignore it. + * resolv/res_hconf.c (_res_hconf_reorder_addrs): Pass new argument. + + * sysdeps/mach/hurd/ifreq.h: New file. + * sysdeps/generic/ifreq.h (__if_freereq): Take second argument NUM_IFS. + * sysdeps/unix/sysv/linux/ifreq.h (__if_freereq): Likewise. + * resolv/res_hconf.c (_res_hconf_reorder_addrs): Update caller. + * libio/fileops.c (_IO_file_seekoff_mmap): Don't rely on FP->_offset, which gets moved around. Calculate size of mmap'd buffer instead. diff --git a/inet/Makefile b/inet/Makefile index ab922db..be588d7 100644 --- a/inet/Makefile +++ b/inet/Makefile @@ -1,4 +1,4 @@ -# Copyright (C) 1991-1999, 2000, 2001 Free Software Foundation, Inc. +# Copyright (C) 1991-1999,2000,01,02 Free Software Foundation, Inc. # This file is part of the GNU C Library. # The GNU C Library is free software; you can redistribute it and/or @@ -24,7 +24,7 @@ subdir := inet headers := netinet/ether.h netinet/in.h netinet/in_systm.h \ netinet/if_ether.h \ netinet/tcp.h netinet/ip.h $(wildcard arpa/*.h protocols/*.h) \ - aliases.h netinet/ip6.h netinet/icmp6.h bits/in.h + aliases.h ifaddrs.h netinet/ip6.h netinet/icmp6.h bits/in.h distribute := netgroup.h @@ -45,10 +45,10 @@ routines := htonl htons \ rcmd rexec ruserpass \ getnetgrent_r getnetgrent \ getaliasent_r getaliasent getaliasname getaliasname_r \ - in6_addr getnameinfo if_index + in6_addr getnameinfo if_index ifaddrs tests := htontest test_ifindex tst-ntoa tst-ether_aton tst-network \ - tst-gethnm + tst-gethnm test-ifaddrs include ../Rules diff --git a/inet/Versions b/inet/Versions index eb3b13c..0eb1e77 100644 --- a/inet/Versions +++ b/inet/Versions @@ -64,6 +64,12 @@ libc { # r* rcmd_af; rexec_af; rresvport_af; ruserok_af; } + GLIBC_2.3 { + # f* + freeifaddrs; + # g* + getifaddrs; + } GLIBC_PRIVATE { # functions used in other libraries __internal_endnetgrent; __internal_getnetgrent_r; diff --git a/inet/ifaddrs.h b/inet/ifaddrs.h new file mode 100644 index 0000000..ba6a155 --- /dev/null +++ b/inet/ifaddrs.h @@ -0,0 +1,74 @@ +/* ifaddrs.h -- declarations for getting network interface addresses + Copyright (C) 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _IFADDRS_H +#define _IFADDRS_H 1 + +#include <features.h> +#include <sys/socket.h> + +__BEGIN_DECLS + +/* The `getifaddrs' function generates a linked list of these structures. + Each element of the list describes one network interface. */ +struct ifaddrs +{ + struct ifaddrs *ifa_next; /* Pointer to the next structure. */ + + char *ifa_name; /* Name of this network interface. */ + unsigned int ifa_flags; /* Flags as from SIOCGIFFLAGS ioctl. */ + + struct sockaddr *ifa_addr; /* Network address of this interface. */ + struct sockaddr *ifa_netmask; /* Netmask of this interface. */ + union + { + /* At most one of the following two is valid. If the IFF_BROADCAST + bit is set in `ifa_flags', then `ifa_broadaddr' is valid. If the + IFF_POINTOPOINT bit is set, then `ifa_dstaddr' is valid. + It is never the case that both these bits are set at once. */ + struct sockaddr *ifu_broadaddr; /* Broadcast address of this interface. */ + struct sockaddr *ifu_dstaddr; /* Point-to-point destination address. */ + } ifa_ifu; + /* These very same macros are defined by <net/if.h> for `struct ifaddr'. + So if they are defined already, the existing definitions will be fine. */ +# ifndef ifa_broadaddr +# define ifa_broadaddr ifa_ifu.ifu_broadaddr +# endif +# ifndef ifa_dstaddr +# define ifa_dstaddr ifa_ifu.ifu_dstaddr +# endif + + void *ifa_data; /* Address-specific data (may be unused). */ +}; + + +/* Create a linked list of `struct ifaddrs' structures, one for each + network interface on the host machine. If successful, store the + list in *IFAP and return 0. On errors, return -1 and set `errno'. + + The storage returned in *IFAP is allocated dynamically and can + only be properly freed by passing it to `freeifaddrs'. */ +extern int getifaddrs (struct ifaddrs **__ifap) __THROW; + +/* Reclaim the storage allocated by a previous `getifaddrs' call. */ +extern void freeifaddrs (struct ifaddrs *__ifa) __THROW; + +__END_DECLS + +#endif /* ifaddrs.h */ diff --git a/inet/test-ifaddrs.c b/inet/test-ifaddrs.c new file mode 100644 index 0000000..42fb7e7 --- /dev/null +++ b/inet/test-ifaddrs.c @@ -0,0 +1,82 @@ +/* Test listing of network interface addresses. + Copyright (C) 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <ifaddrs.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +int +main (void) +{ + int failures = 0; + struct ifaddrs *ifaces, *ifa; + + if (getifaddrs (&ifaces) < 0) + { + if (errno != ENOSYS) + { + printf ("Couldn't get any interfaces: %s.\n", strerror (errno)); + exit (1); + } + /* The function is simply not implemented. */ + exit (0); + } + + puts ("\ +Name Flags Address Netmask Broadcast/Destination"); + + for (ifa = ifaces; ifa != NULL; ifa = ifa->ifa_next) + { + char abuf[64], mbuf[64], dbuf[64]; + inline const char *addr_string (struct sockaddr *sa, char *buf) + { + switch (sa->sa_family) + { + case AF_INET: + return inet_ntop (AF_INET, + &((struct sockaddr_in *) sa)->sin_addr, + buf, sizeof abuf); + case AF_INET6: + return inet_ntop (AF_INET6, + &((struct sockaddr_in6 *) sa)->sin6_addr, + buf, sizeof abuf); + case AF_UNSPEC: + return "---"; + default: + ++failures; + printf ("sa_family=%d %08x\n", sa->sa_family, + *(int*)&((struct sockaddr_in *) sa)->sin_addr.s_addr); + return "<unexpected sockaddr family>"; + } + } + printf ("%-15s%#.4x %-15s %-15s %-15s\n", + ifa->ifa_name, ifa->ifa_flags, + addr_string (ifa->ifa_addr, abuf), + addr_string (ifa->ifa_netmask, mbuf), + addr_string (ifa->ifa_broadaddr, dbuf)); + } + + freeifaddrs (ifaces); + + return failures ? 1 : 0; +} diff --git a/resolv/res_hconf.c b/resolv/res_hconf.c index e6faa68..b814f62 100644 --- a/resolv/res_hconf.c +++ b/resolv/res_hconf.c @@ -538,7 +538,8 @@ _res_hconf_reorder_addrs (struct hostent *hp) num_ifs = 0; - sd = __opensock (); + /* The SIOCGIFNETMASK ioctl will only work on an AF_INET socket. */ + sd = __socket (AF_INET, SOCK_DGRAM, 0); if (sd < 0) return; @@ -546,7 +547,7 @@ _res_hconf_reorder_addrs (struct hostent *hp) __libc_lock_lock (lock); /* Get a list of interfaces. */ - __ifreq (&ifr, &num); + __ifreq (&ifr, &num, sd); if (!ifr) goto cleanup; @@ -577,7 +578,7 @@ _res_hconf_reorder_addrs (struct hostent *hp) ifaddrs = realloc (ifaddrs, num_ifs * sizeof (ifaddrs[0])); cleanup1: - __if_freereq (ifr); + __if_freereq (ifr, num); cleanup: /* Release lock, preserve error value, and close socket. */ diff --git a/sysdeps/generic/ifaddrs.c b/sysdeps/generic/ifaddrs.c new file mode 100644 index 0000000..7b29aa1 --- /dev/null +++ b/sysdeps/generic/ifaddrs.c @@ -0,0 +1,44 @@ +/* getifaddrs -- get names and addresses of all network interfaces + Copyright (C) 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <ifaddrs.h> +#include <errno.h> +#include <stdlib.h> + +/* Create a linked list of `struct ifaddrs' structures, one for each + network interface on the host machine. If successful, store the + list in *IFAP and return 0. On errors, return -1 and set `errno'. */ +int +getifaddrs (struct ifaddrs **ifap) +{ + __set_errno (ENOSYS); + return -1; +} +stub_warning (getifaddrs) + +void +freeifaddrs (struct ifaddrs *ifa) +{ + if (ifa == NULL) + return; /* a la free, why not? */ + + /* Can't be called properly if getifaddrs never succeeded. */ + abort (); +} +stub_warning (freeifaddrs) diff --git a/sysdeps/generic/ifreq.h b/sysdeps/generic/ifreq.h index 62f3dcf..c96d1c8 100644 --- a/sysdeps/generic/ifreq.h +++ b/sysdeps/generic/ifreq.h @@ -1,4 +1,4 @@ -/* Copyright (C) 1999 Free Software Foundation, Inc. +/* Copyright (C) 1999,2002 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Andreas Jaeger <aj@suse.de>. @@ -26,15 +26,17 @@ static inline void -__ifreq (struct ifreq **ifreqs, int *num_ifs) +__ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd) { - int fd = __opensock (); + int fd = sockfd; struct ifconf ifc; int rq_len; int nifs; # define RQ_IFS 4 if (fd < 0) + fd = __opensock (); + if (fd < 0) { *num_ifs = 0; *ifreqs = NULL; @@ -51,8 +53,9 @@ __ifreq (struct ifreq **ifreqs, int *num_ifs) { if (ifc.ifc_buf) free (ifc.ifc_buf); - - __close (fd); + + if (fd != sockfd) + __close (fd); *num_ifs = 0; *ifreqs = NULL; return; @@ -63,7 +66,8 @@ __ifreq (struct ifreq **ifreqs, int *num_ifs) nifs = ifc.ifc_len / sizeof (struct ifreq); - __close (fd); + if (fd != sockfd) + __close (fd); *num_ifs = nifs; *ifreqs = realloc (ifc.ifc_buf, nifs * sizeof (struct ifreq)); @@ -71,7 +75,7 @@ __ifreq (struct ifreq **ifreqs, int *num_ifs) static inline void -__if_freereq (struct ifreq *ifreqs) +__if_freereq (struct ifreq *ifreqs, int num_ifs) { free (ifreqs); } diff --git a/sysdeps/gnu/ifaddrs.c b/sysdeps/gnu/ifaddrs.c new file mode 100644 index 0000000..e0a5b42 --- /dev/null +++ b/sysdeps/gnu/ifaddrs.c @@ -0,0 +1,147 @@ +/* getifaddrs -- get names and addresses of all network interfaces + Copyright (C) 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <ifaddrs.h> +#include <net/if.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#include <unistd.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <netinet/in.h> + +#include "ifreq.h" + +/* Create a linked list of `struct ifaddrs' structures, one for each + network interface on the host machine. If successful, store the + list in *IFAP and return 0. On errors, return -1 and set `errno'. */ +int +getifaddrs (struct ifaddrs **ifap) +{ + /* This implementation handles only IPv4 interfaces. + The various ioctls below will only work on an AF_INET socket. + Some different mechanism entirely must be used for IPv6. */ + int fd = __socket (AF_INET, SOCK_DGRAM, 0); + struct ifreq *ifreqs; + int nifs, i; + + if (fd < 0) + return -1; + + __ifreq (&ifreqs, &nifs, fd); + if (ifreqs == NULL) /* XXX doesn't distinguish error vs none */ + { + __close (fd); + return -1; + } + + /* Now we have the list of interfaces and each one's address. + Put it into the expected format and fill in the remaining details. */ + if (nifs == 0) + *ifap = NULL; + else + { + struct + { + struct ifaddrs ia; + struct sockaddr addr, netmask, broadaddr; + char name[IF_NAMESIZE]; + } *storage; + + storage = malloc (nifs * sizeof storage[0]); + if (storage == NULL) + { + __close (fd); + __if_freereq (ifreqs, nifs); + return -1; + } + + i = 0; + do + { + struct ifreq *const ifr = &ifreqs[i]; + + /* Fill in all pointers to the storage we've already allocated. */ + storage[i].ia.ifa_next = &storage[i + 1].ia; + storage[i].ia.ifa_addr = &storage[i].addr; + storage[i].ia.ifa_netmask = &storage[i].netmask; + storage[i].ia.ifa_broadaddr = &storage[i].broadaddr; /* & dstaddr */ + + /* Now copy the information we already have from SIOCGIFCONF. */ + storage[i].ia.ifa_name = strncpy (storage[i].name, ifr->ifr_name, + sizeof storage[i].name); + storage[i].addr = ifr->ifr_addr; + + /* The SIOCGIFCONF call filled in only the name and address. + Now we must also ask for the other information we need. */ + + if (__ioctl (fd, SIOCGIFFLAGS, ifr) < 0) + break; + storage[i].ia.ifa_flags = ifr->ifr_flags; + + ifr->ifr_addr = storage[i].addr; + if (__ioctl (fd, SIOCGIFNETMASK, ifr) < 0) + break; + storage[i].netmask = ifr->ifr_netmask; + + if (ifr->ifr_flags & IFF_BROADCAST) + { + ifr->ifr_addr = storage[i].addr; + if (__ioctl (fd, SIOCGIFBRDADDR, ifr) < 0) + break; + storage[i].broadaddr = ifr->ifr_broadaddr; + } + else if (ifr->ifr_flags & IFF_POINTOPOINT) + { + ifr->ifr_addr = storage[i].addr; + if (__ioctl (fd, SIOCGIFDSTADDR, ifr) < 0) + break; + storage[i].broadaddr = ifr->ifr_dstaddr; + } + else + /* Just 'cause. */ + memset (&storage[i].broadaddr, 0, sizeof storage[i].broadaddr); + + storage[i].ia.ifa_data = NULL; /* Nothing here for now. */ + + } while (++i < nifs); + if (i < nifs) /* Broke out early on error. */ + { + __close (fd); + free (storage); + __if_freereq (ifreqs, nifs); + return -1; + } + storage[i - 1].ia.ifa_next = NULL; + + *ifap = &storage[0].ia; + + __close (fd); + __if_freereq (ifreqs, nifs); + } + + return 0; +} + +void +freeifaddrs (struct ifaddrs *ifa) +{ + free (ifa); +} diff --git a/sysdeps/mach/hurd/ifreq.h b/sysdeps/mach/hurd/ifreq.h new file mode 100644 index 0000000..737dee9 --- /dev/null +++ b/sysdeps/mach/hurd/ifreq.h @@ -0,0 +1,74 @@ +/* Fetch the host's network interface list. Hurd version. + Copyright (C) 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <net/if.h> +#include <hurd.h> +#include <hurd/pfinet.h> +#include <sys/socket.h> +#include <sys/mman.h> + + +static inline void +__ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd) +{ + struct ifconf ifc; + file_t server; + + server = _hurd_socket_server (PF_INET, 0); + if (server == MACH_PORT_NULL) + { + out: + *num_ifs = 0; + *ifreqs = NULL; + } + else + { + char *data = NULL; + size_t len = 0; + error_t err = __pfinet_siocgifconf (server, -1, &data, &len); + if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED) + { + /* On the first use of the socket server during the operation, + allow for the old server port dying. */ + server = _hurd_socket_server (PF_INET, 1); + if (server == MACH_PORT_NULL) + goto out; + err = __pfinet_siocgifconf (server, -1, ifreqs, &len); + } + if (err) + goto out; + + if (len % sizeof (struct ifreq) != 0) + { + munmap (data, len); + errno = EGRATUITOUS; + goto out; + } + *num_ifs = len / sizeof (struct ifreq); + *ifreqs = (struct ifreq *) data; + } + +} + + +static inline void +__if_freereq (struct ifreq *ifreqs, int num_ifs) +{ + munmap (ifreqs, num_ifs * sizeof (struct ifreq)) +} diff --git a/sysdeps/unix/sysv/linux/ifreq.h b/sysdeps/unix/sysv/linux/ifreq.h index b383425..216c1f3 100644 --- a/sysdeps/unix/sysv/linux/ifreq.h +++ b/sysdeps/unix/sysv/linux/ifreq.h @@ -1,4 +1,4 @@ -/* Copyright (C) 1999 Free Software Foundation, Inc. +/* Copyright (C) 1999,2002 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Andreas Jaeger <aj@suse.de>. @@ -34,21 +34,23 @@ static int old_siocgifconf; static inline void -__ifreq (struct ifreq **ifreqs, int *num_ifs) +__ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd) { - int fd = __opensock (); + int fd = sockfd; struct ifconf ifc; int rq_len; int nifs; # define RQ_IFS 4 if (fd < 0) + fd = __opensock (); + if (fd < 0) { *num_ifs = 0; *ifreqs = NULL; return; } - + ifc.ifc_buf = NULL; /* We may be able to get the needed buffer size directly, rather than @@ -79,8 +81,9 @@ __ifreq (struct ifreq **ifreqs, int *num_ifs) { if (ifc.ifc_buf) free (ifc.ifc_buf); - - __close (fd); + + if (fd != sockfd) + __close (fd); *num_ifs = 0; *ifreqs = NULL; @@ -91,14 +94,16 @@ __ifreq (struct ifreq **ifreqs, int *num_ifs) while (ifc.ifc_len == rq_len && old_siocgifconf); nifs = ifc.ifc_len / sizeof (struct ifreq); - __close (fd); + + if (fd != sockfd) + __close (fd); *num_ifs = nifs; *ifreqs = realloc (ifc.ifc_buf, nifs * sizeof (struct ifreq)); } static inline void -__if_freereq (struct ifreq *ifreqs) +__if_freereq (struct ifreq *ifreqs, int num_ifs) { free (ifreqs); } |