From: Simone Piccardi <piccardi@gnulinux.it>
Date: Sat, 30 Sep 2006 15:05:43 +0000 (+0000)
Subject: Aggiunto esempio di uso delle {{{ioctl}}} per la lettura delle proprietà delle
X-Git-Url: https://gapil.gnulinux.it/gitweb/?p=gapil.git;a=commitdiff_plain;h=20d2dafe03f5ab376e6f5a5e8168d7016ccb55aa

Aggiunto esempio di uso delle {{{ioctl}}} per la lettura delle proprietà delle
interfacce di rete, e messo dentro la libreria la funzione {{{is_closing}}}.
---

diff --git a/sources/Gapil.h b/sources/Gapil.h
index 68fbc24..b83fefd 100644
--- a/sources/Gapil.h
+++ b/sources/Gapil.h
@@ -138,3 +138,4 @@ int sockbindopt(char *host, char *serv, int prot, int type, int reuse);
  * General purpose functions. See corresponding .c
  */
 int endian(void);
+int is_closing(int sock);
diff --git a/sources/Makefile b/sources/Makefile
index 56cbff4..b9345b3 100644
--- a/sources/Makefile
+++ b/sources/Makefile
@@ -9,7 +9,7 @@ CFLAGJ= -L./ -lgapil
 LIB = libgapil.so
 
 OBJ = FullRead.o FullWrite.o SigHand.o Mutex.o SharedMem.o LockFile.o \
-      DirScan.o endian.o SockUtil.o full_fread.o full_fwrite.o
+      DirScan.o endian.o SockUtil.o full_fread.o full_fwrite.o is_closing.o
 
 FINAL = forktest errcode echo echod daytimed iterdaytimed daytime testfopen \
 	testren fortune fortuned mqfortune mqfortuned flock myls dirmonitor \
@@ -108,7 +108,6 @@ endtest: endtest.c
 readshm: ReadShm.c
 	$(CC) $(CFLAGJ) $^ -o $@
 
-
 wwwd: wwwd.c
 	$(CC) $(CFLAGJ) $(CFLAGS) $^ -o $@
 
@@ -118,6 +117,10 @@ acctctrl: AcctCtrl.c
 getcap: getcap.c
 	$(CC) $(CFLAGS) $^  -lcap -o $@
 
+iflist: iflist.c
+	$(CC) $(CFLAGS) $^ -o $@
+
+
 # Macro per la generazione della tarball dei sorgenti
 package: clean gapil_source.tgz
 
diff --git a/sources/iflist.c b/sources/iflist.c
new file mode 100644
index 0000000..6020b52
--- /dev/null
+++ b/sources/iflist.c
@@ -0,0 +1,126 @@
+/* iflist.c
+ * 
+ * Copyright (C) 2006 Simone Piccardi
+ * 
+ * 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.
+ */
+/*****************************************************************************
+ *
+ * File ifist.c: to get a list of network interface and their addresses
+ *
+ * Author: S. Piccardi Sep. 2006
+ *
+ *****************************************************************************/
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdlib.h>        /* C standard library */
+#include <stdio.h>         /* I/O standard library */
+#include <unistd.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <arpa/inet.h>
+
+/*
+ * Program iflist
+ *
+ * Use ioctl to get a list of network interfaces and address
+ */
+
+/* Help printing routine */
+void usage(void);
+
+int main(int argc, char *argv[]) 
+{
+/* 
+ * Variables definition
+ */
+    int i, num, ret, sock;
+    struct ifconf iflist;
+    char buffer[4096];
+    struct sockaddr_in * address;
+    /*
+     * Input section: decode command line parameters 
+     * Use getopt function
+     */
+    opterr = 0;	 /* don't want writing to stderr */
+    while ( (i = getopt(argc, argv, "h")) != -1) {
+	switch (i) {
+	/* 
+	 * Handling options 
+	 */ 
+	case 'h':                                            /* help option */
+	    printf("Wrong -h option use\n");
+	    usage();
+	    return -1;
+	    break;
+	case '?':                                    /* unrecognized options */
+	    printf("Unrecognized options -%c\n",optopt);
+	    usage();
+	default:                                       /* should not reached */
+	    usage();
+	}
+    }
+    /* ***********************************************************
+     * 
+     *		 Options processing completed
+     *
+     *		      Main code beginning
+     * 
+     * ***********************************************************/
+    if ((argc - optind) != 0) {
+	printf("Wrong number of arguments %d\n", argc - optind);
+        usage();
+    }
+    iflist.ifc_len = sizeof(buffer);
+    iflist.ifc_buf = buffer;
+    
+    sock = socket(PF_INET, SOCK_STREAM, 0);
+    if (sock < 0) {
+        perror("Socket creation error");
+        return 1;
+    }
+    ret = ioctl(sock, SIOCGIFCONF, &iflist);
+    if (ret < 0) {
+	perror("ioctl failed");
+        return 1;
+    }
+    if (iflist.ifc_len == sizeof(buffer)) {
+	printf("Probable overflow, too many interfaces, cannot read\n");
+	return 1;
+    } else {
+	num = iflist.ifc_len/sizeof(struct ifreq);
+	printf("Found %i interfaces \n", num);
+    }
+    for (i=0; i < num; i++) {
+	address = (struct sockaddr_in *) &iflist.ifc_req[i].ifr_addr;
+	printf("Interface %s, address %s\n", iflist.ifc_req[i].ifr_name, 
+	       inet_ntoa(address->sin_addr));
+    }
+
+    return 0;
+}
+
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+    printf("Program iflist: list active network interface with address \n");
+    printf("Usage:\n");
+    printf("  iflist [-h] \n");
+    printf("  -h   print this help\n");
+    exit(1);
+}