add new utility "avahi-set-host-name" for changing the mDNS host name during runtime

git-svn-id: file:///home/lennart/svn/public/avahi/trunk@1263 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe

2 files changed, 216 insertions, 1 deletions

diff --git a/avahi-utils/Makefile.am b/avahi-utils/Makefile.am
index d684be1..3d371b0 100644
--- a/avahi-utils/Makefile.am
+++ b/avahi-utils/Makefile.am
@@ -24,7 +24,7 @@ AM_CFLAGS+='-DDEBUG_TRAP=__asm__("int $$3")'
 
 if HAVE_DBUS
 
-bin_PROGRAMS = avahi-browse avahi-resolve avahi-publish
+bin_PROGRAMS = avahi-browse avahi-resolve avahi-publish avahi-set-host-name
 
 avahi_browse_SOURCES = avahi-browse.c sigint.c sigint.h
 avahi_browse_CFLAGS = $(AM_CFLAGS)
@@ -49,6 +49,10 @@ avahi_publish_SOURCES = avahi-publish.c sigint.c sigint.h
 avahi_publish_CFLAGS = $(AM_CFLAGS)
 avahi_publish_LDADD = $(AM_LDADD) ../avahi-client/libavahi-client.la ../avahi-common/libavahi-common.la
 
+avahi_set_host_name_SOURCES = avahi-set-host-name.c sigint.c sigint.h
+avahi_set_host_name_CFLAGS = $(AM_CFLAGS)
+avahi_set_host_name_LDADD = $(AM_LDADD) ../avahi-client/libavahi-client.la ../avahi-common/libavahi-common.la
+
 install-exec-local:
 	cd $(DESTDIR)/$(bindir) && \
 		rm -f avahi-resolve-host-name avahi-resolve-address avahi-browse-domains avahi-publish-address avahi-publish-service && \
diff --git a/avahi-utils/avahi-set-host-name.c b/avahi-utils/avahi-set-host-name.c
new file mode 100644
index 0000000..06f5322
--- /dev/null
+++ b/avahi-utils/avahi-set-host-name.c
@@ -0,0 +1,211 @@
+/* $Id$ */
+
+/***
+  This file is part of avahi.
+ 
+  avahi 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.
+ 
+  avahi 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 avahi; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <assert.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <locale.h>
+
+#include <avahi-common/simple-watch.h>
+#include <avahi-common/error.h>
+#include <avahi-common/malloc.h>
+#include <avahi-common/domain.h>
+#include <avahi-client/client.h>
+
+#include "sigint.h"
+
+typedef enum {
+    COMMAND_UNSPEC, 
+    COMMAND_HELP,
+    COMMAND_VERSION,
+} Command;
+
+typedef struct Config {
+    int verbose;
+    Command command;
+} Config;
+
+static AvahiSimplePoll *simple_poll = NULL;
+static AvahiClient *client = NULL;
+
+static void client_callback(AvahiClient *c, AvahiClientState state, AVAHI_GCC_UNUSED void * userdata) {
+    switch (state) {
+        case AVAHI_CLIENT_FAILURE:
+            fprintf(stderr, "Client failure, exiting: %s\n", avahi_strerror(avahi_client_errno(c)));
+            avahi_simple_poll_quit(simple_poll);
+            break;
+            
+        case AVAHI_CLIENT_S_REGISTERING:
+        case AVAHI_CLIENT_S_RUNNING:
+        case AVAHI_CLIENT_S_COLLISION:
+        case AVAHI_CLIENT_CONNECTING:
+            ;
+    }
+}
+
+static void help(FILE *f, const char *argv0) {
+    fprintf(f,
+            "%s [options] <new host name>\n\n"
+            "    -h --help            Show this help\n"
+            "    -V --version         Show version\n"
+            "    -v --verbose         Enable verbose mode\n",
+            argv0);
+}
+
+static int parse_command_line(Config *c, int argc, char *argv[]) {
+    int o;
+
+    static const struct option long_options[] = {
+        { "help",           no_argument,       NULL, 'h' },
+        { "version",        no_argument,       NULL, 'V' },
+        { "verbose",        no_argument,       NULL, 'v' },
+        { NULL, 0, NULL, 0 }
+    };
+
+    assert(c);
+
+    c->command = COMMAND_UNSPEC;
+    c->verbose = 0;
+
+    opterr = 0;
+    while ((o = getopt_long(argc, argv, "hVv", long_options, NULL)) >= 0) {
+
+        switch(o) {
+            case 'h':
+                c->command = COMMAND_HELP;
+                break;
+            case 'V':
+                c->command = COMMAND_VERSION;
+                break;
+            case 'v':
+                c->verbose = 1;
+                break;
+            default:
+                fprintf(stderr, "Invalid command line argument: %c\n", o);
+                return -1;
+        }
+    }
+
+    if (c->command == COMMAND_UNSPEC) {
+        if (optind != argc-1) {
+            fprintf(stderr, "Invalid number of arguments, expecting exactly one.\n");
+            return -1;
+        }
+    }
+        
+    return 0;
+}
+
+int main(int argc, char *argv[]) {
+    int ret = 1, error;
+    Config config;
+    const char *argv0;
+
+    if ((argv0 = strrchr(argv[0], '/')))
+        argv0++;
+    else
+        argv0 = argv[0];
+
+    if (parse_command_line(&config, argc, argv) < 0)
+        goto fail;
+
+    switch (config.command) {
+        case COMMAND_HELP:
+            help(stdout, argv0);
+            ret = 0;
+            break;
+            
+        case COMMAND_VERSION:
+            printf("%s "PACKAGE_VERSION"\n", argv0);
+            ret = 0;
+            break;
+
+        case COMMAND_UNSPEC: 
+            
+            if (!(simple_poll = avahi_simple_poll_new())) {
+                fprintf(stderr, "Failed to create simple poll object.\n");
+                goto fail;
+            }
+            
+            if (sigint_install(simple_poll) < 0)
+                goto fail;
+            
+            if (!(client = avahi_client_new(avahi_simple_poll_get(simple_poll), 0, client_callback, NULL, &error))) {
+                fprintf(stderr, "Failed to create client object: %s\n", avahi_strerror(error));
+                goto fail;
+            }
+
+            if (config.verbose) {
+                const char *version, *hn;
+
+                if (!(version = avahi_client_get_version_string(client))) {
+                    fprintf(stderr, "Failed to query version string: %s\n", avahi_strerror(avahi_client_errno(client)));
+                    goto fail;
+                }
+
+                if (!(hn = avahi_client_get_host_name_fqdn(client))) {
+                    fprintf(stderr, "Failed to query host name: %s\n", avahi_strerror(avahi_client_errno(client)));
+                    goto fail;
+                }
+                
+                fprintf(stderr, "Server version: %s; Host name: %s\n", version, hn);
+            }
+
+            if (avahi_client_set_host_name(client, argv[optind]) < 0) {
+                fprintf(stderr, "Failed to create host name resolver: %s\n", avahi_strerror(avahi_client_errno(client)));
+                goto fail;
+            }
+
+            if (config.verbose) {
+                const char *hn;
+                
+                if (!(hn = avahi_client_get_host_name_fqdn(client))) {
+                    fprintf(stderr, "Failed to query host name: %s\n", avahi_strerror(avahi_client_errno(client)));
+                    goto fail;
+                }
+                
+                fprintf(stderr, "Host name successfully changed to %s\n", hn);
+            }
+            
+            ret = 0;
+            break;
+    }
+    
+fail:
+
+    if (client)
+        avahi_client_free(client);
+
+    sigint_uninstall();
+    
+    if (simple_poll)
+        avahi_simple_poll_free(simple_poll);
+
+    return ret;
+}