X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=support%2Fmisc%2Ffrom_local.c;h=e2de969266754f3f6ca39615c90cf511b69c28da;hp=f6f944ccd621f030fbe970d971e56ab8a5b21b3a;hb=4bc0dbaed1ba2f58beea2cdb0595b461e0c88b8e;hpb=33beb42d3d2cd13a82ddbbdc4275d2a048030ae3 diff --git a/support/misc/from_local.c b/support/misc/from_local.c index f6f944c..e2de969 100644 --- a/support/misc/from_local.c +++ b/support/misc/from_local.c @@ -6,72 +6,138 @@ */ /* - * Sun RPC is a product of Sun Microsystems, Inc. and is provided for - * unrestricted use provided that this legend is included on all tape - * media and as a part of the software program in whole or part. Users - * may copy or modify Sun RPC without charge, but are not authorized - * to license or distribute it to anyone else except as part of a product or - * program developed by the user or with the express written consent of - * Sun Microsystems, Inc. + * Copyright (c) 2009, Sun Microsystems, Inc. + * All rights reserved. * - * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE - * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR - * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * - Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * - Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * - Neither the name of Sun Microsystems, Inc. nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. * - * Sun RPC is provided with no support and without any obligation on the - * part of Sun Microsystems, Inc. to assist in its use, correction, - * modification or enhancement. - * - * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE - * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC - * OR ANY PART THEREOF. - * - * In no event will Sun Microsystems, Inc. be liable for any lost revenue - * or profits or other special, indirect and consequential damages, even if - * Sun has been advised of the possibility of such damages. - * - * Sun Microsystems, Inc. - * 2550 Garcia Avenue - * Mountain View, California 94043 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. */ #if 0 static char sccsid[] = "@(#) from_local.c 1.3 96/05/31 15:52:57"; #endif -#ifdef TEST -#undef perror +#ifdef HAVE_CONFIG_H +#include #endif #include #include +#include #include #include #include #include #include #include -#include #include #include +#include "sockaddr.h" +#include "tcpwrapper.h" +#include "xlog.h" + #ifndef TRUE #define TRUE 1 #define FALSE 0 #endif - /* - * With virtual hosting, each hardware network interface can have multiple - * network addresses. On such machines the number of machine addresses can - * be surprisingly large. - */ +#ifdef HAVE_GETIFADDRS + +#include +#include + +/** + * from_local - determine whether request comes from the local system + * @sap: pointer to socket address to check + * + * With virtual hosting, each hardware network interface can have + * multiple network addresses. On such machines the number of machine + * addresses can be surprisingly large. + * + * We also expect the local network configuration to change over time, + * so call getifaddrs(3) more than once, but not too often. + * + * Returns TRUE if the sockaddr contains an address of one of the local + * network interfaces. Otherwise FALSE is returned. + */ +int +from_local(const struct sockaddr *sap) +{ + static struct ifaddrs *ifaddr = NULL; + static time_t last_update = 0; + struct ifaddrs *ifa; + unsigned int count; + time_t now; + + if (time(&now) == ((time_t)-1)) { + xlog(L_ERROR, "%s: time(2): %m", __func__); + + /* If we don't know what time it is, use the + * existing ifaddr list, if one exists */ + now = last_update; + if (ifaddr == NULL) + now++; + } + if (now != last_update) { + xlog(D_GENERAL, "%s: updating local if addr list", __func__); + + if (ifaddr) + freeifaddrs(ifaddr); + + if (getifaddrs(&ifaddr) == -1) { + xlog(L_ERROR, "%s: getifaddrs(3): %m", __func__); + return FALSE; + } + + last_update = now; + } + + count = 0; + for (ifa = ifaddr; ifa; ifa = ifa->ifa_next) { + if ((ifa->ifa_flags & IFF_UP) && + nfs_compare_sockaddr(sap, ifa->ifa_addr)) { + xlog(D_GENERAL, "%s: incoming address matches " + "local interface address", __func__); + return TRUE; + } else + count++; + } + + xlog(D_GENERAL, "%s: checked %u local if addrs; " + "incoming address not found", __func__, count); + return FALSE; +} + +#else /* !HAVE_GETIFADDRS */ + static int num_local; static int num_addrs; static struct in_addr *addrs; /* grow_addrs - extend list of local interface addresses */ -static int grow_addrs() +static int grow_addrs(void) { struct in_addr *new_addrs; int new_num; @@ -83,7 +149,7 @@ static int grow_addrs() new_num = (addrs == 0) ? 1 : num_addrs + num_addrs; new_addrs = (struct in_addr *) malloc(sizeof(*addrs) * new_num); if (new_addrs == 0) { - perror("portmap: out of memory"); + xlog_warn("%s: out of memory", __func__); return (0); } else { if (addrs != 0) { @@ -99,7 +165,7 @@ static int grow_addrs() /* find_local - find all IP addresses for this host */ static int -find_local() +find_local(void) { struct ifconf ifc; struct ifreq ifreq; @@ -114,13 +180,13 @@ find_local() */ if ((sock = socket(PF_INET, SOCK_DGRAM, 0)) < 0) { - perror("socket"); + xlog_warn("%s: socket(2): %m", __func__); return (0); } ifc.ifc_len = sizeof(buf); ifc.ifc_buf = buf; if (ioctl(sock, SIOCGIFCONF, (char *) &ifc) < 0) { - perror("SIOCGIFCONF"); + xlog_warn("%s: ioctl(SIOCGIFCONF): %m", __func__); (void) close(sock); return (0); } @@ -132,10 +198,10 @@ find_local() if (ifr->ifr_addr.sa_family == AF_INET) { /* IP net interface */ ifreq = *ifr; if (ioctl(sock, SIOCGIFFLAGS, (char *) &ifreq) < 0) { - perror("SIOCGIFFLAGS"); + xlog_warn("%s: ioctl(SIOCGIFFLAGS): %m", __func__); } else if (ifreq.ifr_flags & IFF_UP) { /* active interface */ if (ioctl(sock, SIOCGIFADDR, (char *) &ifreq) < 0) { - perror("SIOCGIFADDR"); + xlog_warn("%s: ioctl(SIOCGIFADDR): %m", __func__); } else { if (num_local >= num_addrs) if (grow_addrs() == 0) @@ -155,15 +221,28 @@ find_local() return (num_local); } -/* from_local - determine whether request comes from the local system */ +/** + * from_local - determine whether request comes from the local system + * @sap: pointer to socket address to check + * + * With virtual hosting, each hardware network interface can have + * multiple network addresses. On such machines the number of machine + * addresses can be surprisingly large. + * + * Returns TRUE if the sockaddr contains an address of one of the local + * network interfaces. Otherwise FALSE is returned. + */ int -from_local(addr) -struct sockaddr_in *addr; +from_local(const struct sockaddr *sap) { + const struct sockaddr_in *addr = (const struct sockaddr_in *)sap; int i; + if (sap->sa_family != AF_INET) + return (FALSE); + if (addrs == 0 && find_local() == 0) - syslog(LOG_ERR, "cannot find any active local network interfaces"); + xlog(L_ERROR, "Cannot find any active local network interfaces"); for (i = 0; i < num_local; i++) { if (memcmp((char *) &(addr->sin_addr), (char *) &(addrs[i]), @@ -175,9 +254,8 @@ struct sockaddr_in *addr; #ifdef TEST -main() +int main(void) { - char *inet_ntoa(); int i; find_local(); @@ -185,4 +263,6 @@ main() printf("%s\n", inet_ntoa(addrs[i])); } -#endif +#endif /* TEST */ + +#endif /* !HAVE_GETIFADDRS */