X-Git-Url: https://www.tinc-vpn.org/git/browse?a=blobdiff_plain;f=lib%2Fnetutl.c;fp=lib%2Fnetutl.c;h=2ce34410ba6b76525e8ffc3a9f99383eb9e2a6a8;hb=04d33be4bd102de67bb6dba5c449e12fea0db4d2;hp=0000000000000000000000000000000000000000;hpb=b0a676988a8da3120e64ef0e1a4ea4c28b1511e1;p=tinc diff --git a/lib/netutl.c b/lib/netutl.c new file mode 100644 index 00000000..2ce34410 --- /dev/null +++ b/lib/netutl.c @@ -0,0 +1,247 @@ +/* + netutl.c -- some supporting network utility code + Copyright (C) 1998-2002 Ivo Timmermans + 2000-2002 Guus Sliepen + + 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. + + $Id: netutl.c,v 1.1 2002/04/28 12:46:25 zarq Exp $ +*/ + +#include "config.h" + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include +#include + +#include "errno.h" +#include "conf.h" +#include "net.h" +#include "netutl.h" +#include "logging.h" + +#include "system.h" + +int hostnames = 0; + +/* + Turn a string into a struct addrinfo. + Return NULL on failure. +*/ +struct addrinfo *str2addrinfo(char *address, char *service, int socktype) +{ + struct addrinfo hint, *ai; + int err; +cp + memset(&hint, 0, sizeof(hint)); + + hint.ai_family = addressfamily; + hint.ai_socktype = socktype; + + if((err = getaddrinfo(address, service, &hint, &ai))) + { + if(debug_lvl >= DEBUG_ERROR) + syslog(LOG_WARNING, _("Error looking up %s port %s: %s\n"), address, service, gai_strerror(err)); + cp_trace(); + return NULL; + } + +cp + return ai; +} + +sockaddr_t str2sockaddr(char *address, char *port) +{ + struct addrinfo hint, *ai; + sockaddr_t result; + int err; +cp + memset(&hint, 0, sizeof(hint)); + + hint.ai_family = AF_UNSPEC; + hint.ai_flags = AI_NUMERICHOST; + hint.ai_socktype = SOCK_STREAM; + + if((err = getaddrinfo(address, port, &hint, &ai) || !ai)) + { + syslog(LOG_ERR, _("Error looking up %s port %s: %s\n"), address, port, gai_strerror(err)); + cp_trace(); + raise(SIGFPE); + exit(0); + } + + result = *(sockaddr_t *)ai->ai_addr; + freeaddrinfo(ai); +cp + return result; +} + +void sockaddr2str(sockaddr_t *sa, char **addrstr, char **portstr) +{ + char address[NI_MAXHOST]; + char port[NI_MAXSERV]; + char *scopeid; + int err; +cp + if((err = getnameinfo(&sa->sa, SALEN(sa->sa), address, sizeof(address), port, sizeof(port), NI_NUMERICHOST|NI_NUMERICSERV))) + { + syslog(LOG_ERR, _("Error while translating addresses: %s"), gai_strerror(err)); + cp_trace(); + raise(SIGFPE); + exit(0); + } + +#ifdef HAVE_LINUX + if((scopeid = strchr(address, '%'))) + *scopeid = '\0'; /* Descope. */ +#endif + + *addrstr = xstrdup(address); + *portstr = xstrdup(port); +cp +} + +char *sockaddr2hostname(sockaddr_t *sa) +{ + char *str; + char address[NI_MAXHOST] = "unknown"; + char port[NI_MAXSERV] = "unknown"; + int err; +cp + if((err = getnameinfo(&sa->sa, SALEN(sa->sa), address, sizeof(address), port, sizeof(port), hostnames?0:(NI_NUMERICHOST|NI_NUMERICSERV)))) + { + syslog(LOG_ERR, _("Error while looking up hostname: %s"), gai_strerror(err)); + } + + asprintf(&str, _("%s port %s"), address, port); +cp + return str; +} + +int sockaddrcmp(sockaddr_t *a, sockaddr_t *b) +{ + int result; +cp + result = a->sa.sa_family - b->sa.sa_family; + + if(result) + return result; + + switch(a->sa.sa_family) + { + case AF_UNSPEC: + return 0; + case AF_INET: + result = memcmp(&a->in.sin_addr, &b->in.sin_addr, sizeof(a->in.sin_addr)); + if(result) + return result; + return memcmp(&a->in.sin_port, &b->in.sin_port, sizeof(a->in.sin_port)); + case AF_INET6: + result = memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr)); + if(result) + return result; + return memcmp(&a->in6.sin6_port, &b->in6.sin6_port, sizeof(a->in6.sin6_port)); + default: + syslog(LOG_ERR, _("sockaddrcmp() was called with unknown address family %d, exitting!"), a->sa.sa_family); + cp_trace(); + raise(SIGFPE); + exit(0); + } +cp +} + +void sockaddrunmap(sockaddr_t *sa) +{ + if(sa->sa.sa_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&sa->in6.sin6_addr)) + { + sa->in.sin_addr.s_addr = ((uint32_t *)&sa->in6.sin6_addr)[3]; + sa->in.sin_family = AF_INET; + } +} + +/* Subnet mask handling */ + +int maskcmp(char *a, char *b, int masklen, int len) +{ + int i, m, result; +cp + for(m = masklen, i = 0; m >= 8; m -= 8, i++) + if((result = a[i] - b[i])) + return result; + + if(m) + return (a[i] & (0x100 - (1 << (8 - m)))) - (b[i] & (0x100 - (1 << (8 - m)))); + + return 0; +} + +void mask(char *a, int masklen, int len) +{ + int i; +cp + i = masklen / 8; + masklen %= 8; + + if(masklen) + a[i++] &= (0x100 - (1 << masklen)); + + for(; i < len; i++) + a[i] = 0; +} + +void maskcpy(char *a, char *b, int masklen, int len) +{ + int i, m; +cp + for(m = masklen, i = 0; m >= 8; m -= 8, i++) + a[i] = b[i]; + + if(m) + { + a[i] = b[i] & (0x100 - (1 << m)); + i++; + } + + for(; i < len; i++) + a[i] = 0; +} + +int maskcheck(char *a, int masklen, int len) +{ + int i; +cp + i = masklen / 8; + masklen %= 8; + + if(masklen) + if(a[i++] & (char)~(0x100 - (1 << masklen))) + return -1; + + for(; i < len; i++) + if(a[i] != 0) + return -1; + + return 0; +}