diff options
Diffstat (limited to 'sntp/internet.c')
| -rw-r--r-- | sntp/internet.c | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/sntp/internet.c b/sntp/internet.c deleted file mode 100644 index a1040f1673ab..000000000000 --- a/sntp/internet.c +++ /dev/null @@ -1,207 +0,0 @@ -/* Copyright (C) 1996 N.M. Maclaren - Copyright (C) 1996 The University of Cambridge - -This includes all of the code needed to handle Internet addressing. It is way -outside current POSIX, unfortunately. It should be easy to convert to a system -that uses another mechanism. The signal handling is not necessary for its -function, but is an attempt to avoid the program hanging when the name server -is inaccessible. */ - - - -#include "header.h" -#include "internet.h" - -#include <netdb.h> -#include <arpa/inet.h> - -#define INTERNET -#include "kludges.h" -#undef INTERNET - - -/* Used to force dns resolving to ipv4 or ipv6 addresses. */ -static int pref_family; - -/* There needs to be some disgusting grobble for handling timeouts, which is -identical to the grobble in socket.c. */ - -static jmp_buf jump_buffer; - -static void jump_handler (int sig) { - longjmp(jump_buffer,1); -} - -static void clear_alarm (void) { - int k; - - k = errno; - alarm(0); - errno = 0; - if (signal(SIGALRM,SIG_DFL) == SIG_ERR) - fatal(1,"unable to reset signal handler",NULL); - errno = k; -} - -void preferred_family(int fam) { - switch(fam) { - case PREF_FAM_INET: - pref_family = AF_INET; - break; -#ifdef HAVE_IPV6 - case PREF_FAM_INET6: - pref_family = AF_INET6; - break; -#endif - default: - fatal(0,"unable to set the preferred family", NULL); - break; - } -} - -#ifdef HAVE_IPV6 - -void find_address (struct sockaddr_storage *address, - struct sockaddr_storage *anywhere, - int *port, char *hostname, int timespan) { - -/* Locate the specified NTP server and return its Internet address and port -number. */ - - int family, rval; - struct addrinfo hints; - struct addrinfo *res; - - res = NULL; - memset(address, 0, sizeof(struct sockaddr_storage)); - memset(anywhere, 0, sizeof(struct sockaddr_storage)); - - if (setjmp(jump_buffer)) - fatal(0,"unable to set up access to NTP server %s",hostname); - errno = 0; - if (signal(SIGALRM,jump_handler) == SIG_ERR) - fatal(1,"unable to set up signal handler",NULL); - alarm((unsigned int)timespan); - -/* Look up the Internet name or IP number. */ - memset(&hints, 0, sizeof(hints)); - hints.ai_socktype = SOCK_DGRAM; - hints.ai_family = pref_family; - rval = getaddrinfo(hostname, "ntp", &hints, &res); - if (rval != 0) - fatal(0, "getaddrinfo(hostname, ntp) failed with %s", - gai_strerror(rval)); - -/* Now clear the timer and check the result. */ - - clear_alarm(); - /* There can be more than one address in the list, but for now only - use the first. */ - memcpy(address, res->ai_addr, res->ai_addrlen); - family = res->ai_family; - freeaddrinfo(res); - - switch(family) { - case AF_INET: - hints.ai_family = AF_INET; - hints.ai_flags = AI_PASSIVE; - rval = getaddrinfo(NULL, "ntp", &hints, &res); - if (rval != 0) - fatal(0, "getaddrinfo(NULL, ntp) failed with %s", - gai_strerror(rval)); - memcpy(anywhere, res->ai_addr, res->ai_addrlen); - freeaddrinfo(res); - break; - case AF_INET6: - hints.ai_family = AF_INET6; - hints.ai_flags = AI_PASSIVE; - rval = getaddrinfo(NULL, "ntp", &hints, &res); - if (rval != 0) - fatal(0, "getaddrinfo(NULL, ntp, INET6, AI_PASSIVE) failed with %s", - gai_strerror(rval)); - memcpy(anywhere, res->ai_addr, res->ai_addrlen); - freeaddrinfo(res); - break; - } -} - -#else - -void find_address (struct in_addr *address, struct in_addr *anywhere, - int *port, char *hostname, int timespan) { - -/* Locate the specified NTP server and return its Internet address and port -number. */ - - unsigned long ipaddr; - struct in_addr nowhere[1]; - struct hostent *host; - struct servent *service; - -/* Set up the reserved Internet addresses, attempting not to assume that -addresses are 32 bits. */ - - local_to_address(nowhere,INADDR_LOOPBACK); - local_to_address(anywhere,INADDR_ANY); - -/* Check the address, if any. This assumes that the DNS is reliable, or is at -least checked by someone else. But it doesn't assume that it is accessible, so -it needs to set up a timeout. */ - - if (hostname == NULL) - *address = *anywhere; - else { - if (setjmp(jump_buffer)) - fatal(0,"unable to set up access to NTP server %s",hostname); - errno = 0; - if (signal(SIGALRM,jump_handler) == SIG_ERR) - fatal(1,"unable to set up signal handler",NULL); - alarm((unsigned int)timespan); - -/* Look up the Internet name or IP number. */ - - if (! isdigit(hostname[0])) { - errno = 0; - host = gethostbyname(hostname); - } else { - if ((ipaddr = inet_addr(hostname)) == (unsigned long)-1) - fatal(0,"invalid IP number %s",hostname); - network_to_address(address,ipaddr); - errno = 0; - host = gethostbyaddr((void *)address,sizeof(struct in_addr), - AF_INET); - } - -/* Now clear the timer and check the result. */ - - clear_alarm(); - if (host == NULL) fatal(1,"unable to locate IP address/number",NULL); - if (host->h_length != sizeof(struct in_addr)) - fatal(0,"the address does not seem to be an Internet one",NULL); - *address = *((struct in_addr **)host->h_addr_list)[0]; - if (memcmp(address,nowhere,sizeof(struct in_addr)) == 0 - || memcmp(address,anywhere,sizeof(struct in_addr)) == 0) - fatal(0,"reserved IP numbers cannot be used",NULL); - if (verbose) - fprintf(stderr, - "%s: using NTP server %s (%s)\n", - argv0,host->h_name,inet_ntoa(*address)); - } - -/* Find out the port number (usually from /etc/services), and leave it in -network format. This is assumed not to be obtained from a network service! -Note that a port number is not assumed to be 16 bits. */ - - if ((service = getservbyname("ntp","udp")) != NULL) { - *port = service->s_port; - if (verbose > 2) - fprintf(stderr,"Using port %d for NTP\n",port_to_integer(*port)); - } else { - *port = NTP_PORT; - if (verbose) - fprintf(stderr, - "%s: assuming port %d for NTP - check /etc/services\n", - argv0,port_to_integer(*port)); - } -} -#endif |