/* Display hostname in various forms. Copyright (C) 2001-2003, 2006-2007 Free Software Foundation, Inc. Written by Bruno Haible , 2001. 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 3 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, see . */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include #include #if defined _WIN32 || defined __WIN32__ # define WIN32_NATIVE #endif /* Get gethostname(). */ #include #ifdef WIN32_NATIVE /* Native Woe32 API lacks gethostname() but has GetComputerName() instead. */ # include #else /* Some systems, like early Solaris versions, lack gethostname() but have uname() instead. */ # if !HAVE_GETHOSTNAME # include # endif #endif /* Get MAXHOSTNAMELEN. */ #include #ifndef MAXHOSTNAMELEN # define MAXHOSTNAMELEN 64 #endif /* Support for using gethostbyname(). */ #if HAVE_GETHOSTBYNAME # include # include /* defines AF_INET, AF_INET6 */ # include /* declares ntohs(), defines struct sockaddr_in */ # if HAVE_ARPA_INET_H # include /* declares inet_ntoa(), inet_ntop() */ # endif # if HAVE_IPV6 # if !defined(__CYGWIN__) /* Cygwin has only s6_addr, no s6_addr16 */ # if defined(__APPLE__) && defined(__MACH__) /* MacOS X */ # define in6_u __u6_addr # define u6_addr16 __u6_addr16 # endif /* Use s6_addr16 for portability. See RFC 2553. */ # ifndef s6_addr16 # define s6_addr16 in6_u.u6_addr16 # endif # define HAVE_IN6_S6_ADDR16 1 # endif # endif # include /* defines struct hostent, declares gethostbyname() */ #endif /* Include this after , to avoid a syntax error on BeOS. */ #include #include "closeout.h" #include "error.h" #include "error-progname.h" #include "progname.h" #include "relocatable.h" #include "basename.h" #include "xalloc.h" #include "propername.h" #include "gettext.h" #define _(str) gettext (str) /* Output format. */ static enum { default_format, short_format, long_format, ip_format } format; /* Long options. */ static const struct option long_options[] = { { "fqdn", no_argument, NULL, 'f' }, { "help", no_argument, NULL, 'h' }, { "ip-address", no_argument, NULL, 'i' }, { "long", no_argument, NULL, 'f' }, { "short", no_argument, NULL, 's' }, { "version", no_argument, NULL, 'V' }, { NULL, 0, NULL, 0 } }; /* Forward declaration of local functions. */ static void usage (int status) #if defined __GNUC__ && ((__GNUC__ == 2 && __GNUC_MINOR__ >= 5) || __GNUC__ > 2) __attribute__ ((noreturn)) #endif ; static void print_hostname (void); int main (int argc, char *argv[]) { int optchar; bool do_help; bool do_version; /* Set program name for messages. */ set_program_name (argv[0]); error_print_progname = maybe_print_progname; #ifdef HAVE_SETLOCALE /* Set locale via LC_ALL. */ setlocale (LC_ALL, ""); #endif /* Set the text message domain. */ bindtextdomain (PACKAGE, relocate (LOCALEDIR)); textdomain (PACKAGE); /* Ensure that write errors on stdout are detected. */ atexit (close_stdout); /* Set default values for variables. */ do_help = false; do_version = false; format = default_format; /* Parse command line options. */ while ((optchar = getopt_long (argc, argv, "fhisV", long_options, NULL)) != EOF) switch (optchar) { case '\0': /* Long option. */ break; case 'f': format = long_format; break; case 's': format = short_format; break; case 'i': format = ip_format; break; case 'h': do_help = true; break; case 'V': do_version = true; break; default: usage (EXIT_FAILURE); /* NOTREACHED */ } /* Version information requested. */ if (do_version) { printf ("%s (GNU %s) %s\n", basename (program_name), PACKAGE, VERSION); /* xgettext: no-wrap */ printf (_("Copyright (C) %s Free Software Foundation, Inc.\n\ License GPLv3+: GNU GPL version 3 or later \n\ This is free software: you are free to change and redistribute it.\n\ There is NO WARRANTY, to the extent permitted by law.\n\ "), "2001-2003, 2006-2007"); printf (_("Written by %s.\n"), proper_name ("Bruno Haible")); exit (EXIT_SUCCESS); } /* Help is requested. */ if (do_help) usage (EXIT_SUCCESS); /* Test for extraneous arguments. */ if (optind != argc) error (EXIT_FAILURE, 0, _("too many arguments")); /* Get and print the hostname. */ print_hostname (); exit (EXIT_SUCCESS); } /* Display usage information and exit. */ static void usage (int status) { if (status != EXIT_SUCCESS) fprintf (stderr, _("Try `%s --help' for more information.\n"), program_name); else { printf (_("\ Usage: %s [OPTION]\n\ "), program_name); printf ("\n"); printf (_("\ Print the machine's hostname.\n")); printf ("\n"); printf (_("\ Output format:\n")); printf (_("\ -s, --short short host name\n")); printf (_("\ -f, --fqdn, --long long host name, includes fully qualified domain\n\ name, and aliases\n")); printf (_("\ -i, --ip-address addresses for the hostname\n")); printf ("\n"); printf (_("\ Informative output:\n")); printf (_("\ -h, --help display this help and exit\n")); printf (_("\ -V, --version output version information and exit\n")); printf ("\n"); /* TRANSLATORS: The placeholder indicates the bug-reporting address for this package. Please add _another line_ saying "Report translation bugs to <...>\n" with the address for translation bugs (typically your translation team's web or email address). */ fputs (_("Report bugs to .\n"), stdout); } exit (status); } /* Returns an xmalloc()ed string containing the machine's host name. */ static char * xgethostname () { #ifdef WIN32_NATIVE char hostname[MAX_COMPUTERNAME_LENGTH+1]; DWORD size = sizeof (hostname); if (!GetComputerName (hostname, &size)) error (EXIT_FAILURE, 0, _("could not get host name")); return xstrdup (hostname); #elif HAVE_GETHOSTNAME char hostname[MAXHOSTNAMELEN+1]; if (gethostname (hostname, MAXHOSTNAMELEN) < 0) error (EXIT_FAILURE, errno, _("could not get host name")); hostname[MAXHOSTNAMELEN] = '\0'; return xstrdup (hostname); #else struct utsname utsname; if (uname (&utsname) < 0) error (EXIT_FAILURE, errno, _("could not get host name")); return xstrdup (utsname.nodename); #endif } /* Converts an AF_INET address to a printable, presentable format. BUFFER is an array with at least 15+1 bytes. ADDR is 'struct in_addr'. */ #if HAVE_INET_NTOP # define ipv4_ntop(buffer,addr) \ inet_ntop (AF_INET, &addr, buffer, 15+1) #else # define ipv4_ntop(buffer,addr) \ strcpy (buffer, inet_ntoa (addr)) #endif #if HAVE_IPV6 /* Converts an AF_INET6 address to a printable, presentable format. BUFFER is an array with at least 45+1 bytes. ADDR is 'struct in6_addr'. */ # if HAVE_INET_NTOP # define ipv6_ntop(buffer,addr) \ inet_ntop (AF_INET6, &addr, buffer, 45+1) # elif HAVE_IN6_S6_ADDR16 # define ipv6_ntop(buffer,addr) \ sprintf (buffer, "%x:%x:%x:%x:%x:%x:%x:%x", \ ntohs ((addr).s6_addr16[0]), \ ntohs ((addr).s6_addr16[1]), \ ntohs ((addr).s6_addr16[2]), \ ntohs ((addr).s6_addr16[3]), \ ntohs ((addr).s6_addr16[4]), \ ntohs ((addr).s6_addr16[5]), \ ntohs ((addr).s6_addr16[6]), \ ntohs ((addr).s6_addr16[7])) # else # define ipv6_ntop(buffer,addr) \ sprintf (buffer, "%x:%x:%x:%x:%x:%x:%x:%x", \ ((addr).s6_addr[0] << 8) | (addr).s6_addr[1], \ ((addr).s6_addr[2] << 8) | (addr).s6_addr[3], \ ((addr).s6_addr[4] << 8) | (addr).s6_addr[5], \ ((addr).s6_addr[6] << 8) | (addr).s6_addr[7], \ ((addr).s6_addr[8] << 8) | (addr).s6_addr[9], \ ((addr).s6_addr[10] << 8) | (addr).s6_addr[11], \ ((addr).s6_addr[12] << 8) | (addr).s6_addr[13], \ ((addr).s6_addr[14] << 8) | (addr).s6_addr[15]) # endif #endif /* Print the hostname according to the specified format. */ static void print_hostname () { char *hostname; char *dot; #if HAVE_GETHOSTBYNAME struct hostent *h; size_t i; #endif hostname = xgethostname (); switch (format) { case default_format: /* Print the hostname, as returned by the system call. */ printf ("%s\n", hostname); break; case short_format: /* Print only the part before the first dot. */ dot = strchr (hostname, '.'); if (dot != NULL) *dot = '\0'; printf ("%s\n", hostname); break; case long_format: /* Look for netwide usable hostname and aliases using gethostbyname(). */ #if HAVE_GETHOSTBYNAME h = gethostbyname (hostname); if (h != NULL) { printf ("%s\n", h->h_name); if (h->h_aliases != NULL) for (i = 0; h->h_aliases[i] != NULL; i++) printf ("%s\n", h->h_aliases[i]); } else #endif printf ("%s\n", hostname); break; case ip_format: /* Look for netwide usable IP addresses using gethostbyname(). */ #if HAVE_GETHOSTBYNAME h = gethostbyname (hostname); if (h != NULL && h->h_addr_list != NULL) for (i = 0; h->h_addr_list[i] != NULL; i++) { #if HAVE_IPV6 if (h->h_addrtype == AF_INET6) { char buffer[45+1]; ipv6_ntop (buffer, *(const struct in6_addr*) h->h_addr_list[i]); printf("[%s]\n", buffer); } else #endif if (h->h_addrtype == AF_INET) { char buffer[15+1]; ipv4_ntop (buffer, *(const struct in_addr*) h->h_addr_list[i]); printf("[%s]\n", buffer); } } #endif break; default: abort (); } }