chore: re-indent code (linux style)

CMakeLists.txt

@@ -33,6 +33,9 @@ target_link_libraries(igmpgen ${LIBNET_LIBRARY})
 # Installation instructions
 install(TARGETS igmpgen DESTINATION bin)
 
+# Install the man page
+install(FILES misc/igmpgen.man.1 DESTINATION share/man/man1 RENAME igmpgen.1)
+
 # Include CPack for packaging
 include(InstallRequiredSystemLibraries)
 set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE.txt")

Makefile

@@ -0,0 +1,24 @@
+
+BUILD_DIR=_build
+
+all: build
+
+$(BUILD_DIR):
+	mkdir -p $(BUILD_DIR)
+	cmake -S . -B _build -D CMAKE_BUILD_TYPE=Debug
+
+build: | $(BUILD_DIR)
+	cmake --build _build
+
+debug: | $(BUILD_DIR)
+	gdb _build/igmpgen 
+
+run: | $(BUILD_DIR)
+	_build/igmpgen
+
+install: | $(BUILD_DIR)
+	cmake --install _build
+
+package: | $(BUILD_DIR)
+	make -C _build package
+

build.sh

@@ -1,5 +0,0 @@
-#!/bin/sh
-
-mkdir -p _build
-cmake -S . -B _build -D CMAKE_BUILD_TYPE=Debug
-cmake --build _build

misc/igmpgen.man.1

@@ -0,0 +1,86 @@
+.TH IGMPGEN 1 "Your Date Here" "Version Number Here" "IGMPGEN Manual"
+.SH NAME
+igmpgen \- IGMP packet generator
+
+.SH SYNOPSIS
+.B igmpgen
+[options]
+
+.SH DESCRIPTION
+.PP
+The
+.B igmpgen
+utility is used to generate IGMP (Internet Group Management Protocol) network packets.
+
+.SH OPTIONS
+.TP
+.B \-i <interface>
+Specify the network interface (e.g., eth0).
+
+.TP
+.B \-t <type>
+Specify the IGMP packet type and version (e.g., 1.query).
+
+.TP
+.B \-g <group>
+Specify the destination IGMP group (e.g., 224.0.0.1).
+
+.TP
+.B \-s <source>
+Specify the source IP and port (e.g., 192.168.1.1:1234).
+
+.TP
+.B \-d <destination>
+Specify the destination IP and port (e.g., 224.0.0.2:5678).
+
+.TP
+.B \-n <number>
+Specify delay between packets in seconds (optional).
+
+.SH AVAILABLE IGMP PACKET TYPES
+.PP
+The following IGMP packet types are available:
+.PP
+\- 1.query
+.br
+\- 1.report
+.br
+\- 1.dvmrp
+.br
+\- 2.query
+.br
+\- 2.report
+.br
+\- 2.leave
+.br
+\- 3.report
+
+.SH EXAMPLES
+.PP
+To generate a 1.query IGMP packet on eth0:
+.PP
+.nf
+\fB$ igmpgen -i eth0 -t 1.query\fR
+.fi
+
+.SH AUTHOR
+.PP
+Written by Your Name.
+
+.SH "SEE ALSO"
+.PP
+Related commands or documentation.
+
+.SH BUGS
+.PP
+No known bugs.
+
+.SH LICENSE
+.PP
+Specify license information or refer to the LICENSE file.
+
+.SH "REPORTING BUGS"
+.PP
+Provide information on how to report bugs.
+
+

run.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-
-gdb _build/igmpgen 

src/ipg_types.h

@@ -2,31 +2,30 @@
 #ifndef IGP_TYPES_H
 #define IGP_TYPES_H
 
-#define IPOPT_RA                148             /* router alert */
+#define IPOPT_RA                148	/* router alert */
 #define IGMP_V3_MEMBERSHIP_REPORT 0x22
 
 #include <sys/types.h>
 
 /* Structure to represent IGMP extra information */
 typedef struct {
-    u_int8_t igmp_version;
-    char *igmp_tag;
-    u_int8_t igmp_type;             /* IGMP type */
-    u_int8_t igmp_code;             /* routing code */
-    char *igmp_dst;
-    int group_override_dst;
+	u_int8_t igmp_version;
+	char *igmp_tag;
+	u_int8_t igmp_type;	/* IGMP type */
+	u_int8_t igmp_code;	/* routing code */
+	char *igmp_dst;
+	int group_override_dst;
 } ipg_igmp_extra_t;
 
 typedef struct {
-    char *device;
-    char *igmp_type_version; // Combined type and version
-    char *igmp_group;
-    char *source_ip_port; // Combined source IP and port
-    char *destination_ip_port; // Combined destination IP and port
-    int delay_between_packets; // Optional, can be 0 if not specified
+	char *device;
+	char *igmp_type_version;	// Combined type and version
+	char *igmp_group;
+	char *source_ip_port;	// Combined source IP and port
+	char *destination_ip_port;	// Combined destination IP and port
+	int delay_between_packets;	// Optional, can be 0 if not specified
 } ipg_cmdline_options_t;
 
 extern ipg_igmp_extra_t g_igmp_pkts[];
 
-#endif /* IGP_TYPES_H */
-
+#endif				/* IGP_TYPES_H */

src/main.c

@@ -5,10 +5,10 @@
 #include <sys/types.h>
 
 /* missing type definitions (depending on system) */
-typedef unsigned char           unchar;
-typedef unsigned short          ushort;
-typedef unsigned int            uint;
-typedef unsigned long           ulong;
+typedef unsigned char unchar;
+typedef unsigned short ushort;
+typedef unsigned int uint;
+typedef unsigned long ulong;
 
 #include <libnet.h>
 #include <netinet/igmp.h>
@@ -17,356 +17,358 @@ typedef unsigned long           ulong;
 
 /* global table of IGMP packet types*/
 ipg_igmp_extra_t g_igmp_pkts[] = {
-    /* name,  type (or version+type), code */
-    { 1, "query",  0x11, 0, "224.0.0.1", 0 },
-    { 1, "report", 0x12, 0, "224.0.0.1", 1 },
-    { 1, "dvmrp",  0x13, 0, "224.0.0.1", 0 },
-    { 2, "query",  0x11, 1, "224.0.0.1", 0 },
-    { 2, "report", 0x16, 1, "224.0.0.2", 1 },
-    { 2, "leave",  0x17, 1, "224.0.0.2", 0 },
-    { 3, "report", 0x22, 1, "224.0.0.22", 0 },
+	/* name,  type (or version+type), code */
+	{1, "query", 0x11, 0, "224.0.0.1", 0},
+	{1, "report", 0x12, 0, "224.0.0.1", 1},
+	{1, "dvmrp", 0x13, 0, "224.0.0.1", 0},
+	{2, "query", 0x11, 1, "224.0.0.1", 0},
+	{2, "report", 0x16, 1, "224.0.0.2", 1},
+	{2, "leave", 0x17, 1, "224.0.0.2", 0},
+	{3, "report", 0x22, 1, "224.0.0.22", 0},
 
-    /* Note: end of list (please keep) */
-    { 0, 0, 0, 0, 0, 0 },
+	/* Note: end of list (please keep) */
+	{0, 0, 0, 0, 0, 0},
 };
 
 void usage(char *);
 
-ipg_igmp_extra_t * igmp_packet_type_find(u_int8_t igmp_version, char *igmp_request) {
-    ipg_igmp_extra_t *pkt_ptr;
+ipg_igmp_extra_t *igmp_packet_type_find(u_int8_t igmp_version,
+					char *igmp_request)
+{
+	ipg_igmp_extra_t *pkt_ptr;
 
-    pkt_ptr = g_igmp_pkts;
-    while(pkt_ptr->igmp_version || pkt_ptr->igmp_tag){
-        // if ((strcasecmp(pkt_ptr->igmp_tag, optarg) == 0) 
-        if ((strcasecmp(pkt_ptr->igmp_tag, igmp_request) == 0) 
-                && (igmp_version == pkt_ptr->igmp_version)){
-            return pkt_ptr;
-        }
-        pkt_ptr++; 
-    }
-    return NULL;
+	pkt_ptr = g_igmp_pkts;
+	while (pkt_ptr->igmp_version || pkt_ptr->igmp_tag) {
+		// if ((strcasecmp(pkt_ptr->igmp_tag, optarg) == 0) 
+		if ((strcasecmp(pkt_ptr->igmp_tag, igmp_request) == 0)
+		    && (igmp_version == pkt_ptr->igmp_version)) {
+			return pkt_ptr;
+		}
+		pkt_ptr++;
+	}
+	return NULL;
 }
 
 int main(int argc, char **argv)
 {
-    u_int32_t ip_src = 0;
-    u_int32_t ip_dst = 0;
-    u_int32_t igmp_group = 0;      
-    char *igmp_group_str = NULL;
-    char *ip_src_str = NULL;
-    char *ip_dst_str = NULL;
-    u_char igmp_type = 0;
-    u_char igmp_code = 0;
-    ipg_igmp_extra_t *pkt_ptr;
-    int igmp_override;
+	u_int32_t ip_src = 0;
+	u_int32_t ip_dst = 0;
+	u_int32_t igmp_group = 0;
+	char *igmp_group_str = NULL;
+	char *ip_src_str = NULL;
+	char *ip_dst_str = NULL;
+	u_char igmp_type = 0;
+	u_char igmp_code = 0;
+	ipg_igmp_extra_t *pkt_ptr;
+	int igmp_override;
 
-    /* ports */
-    u_short src_prt = 3141;
-    u_short dst_prt = 5926;   
+	/* ports */
+	u_short src_prt = 3141;
+	u_short dst_prt = 5926;
 
-    /* igmp stuff */
-    u_int8_t igmp_version = 0;
+	/* igmp stuff */
+	u_int8_t igmp_version = 0;
 
-    int ip_src_test = 1;
-    int ip_dst_test = 1;
-    int igmp_group_test =1;
+	int ip_src_test = 1;
+	int ip_dst_test = 1;
+	int igmp_group_test = 1;
 
-    /* libnet stuff */
-    char neterr[LIBNET_ERRBUF_SIZE];
-    libnet_ptag_t ptag;
-    libnet_t *netcontext = NULL;
+	/* libnet stuff */
+	char neterr[LIBNET_ERRBUF_SIZE];
+	libnet_ptag_t ptag;
+	libnet_t *netcontext = NULL;
 
-    /* misc */
-    char *device = "eth0";
-    int c;                      
-    char *cp = NULL; 
+	/* misc */
+	char *device = "eth0";
+	int c;
+	char *cp = NULL;
 
-    printf("IGMP packet generator\n\n");
-    printf("Detected options:\n");
+	printf("IGMP packet generator\n\n");
+	printf("Detected options:\n");
 
-    /* Parsing command line */
-    while((c = getopt(argc, argv, "i:t:g:d:s:")) != EOF)
-    {
-        switch (c)
-        {
-            case 'i':
-                printf("  Net interface = [%s]\n",optarg);
-                device = optarg;
-                break;
+	/* Parsing command line */
+	while ((c = getopt(argc, argv, "i:t:g:d:s:")) != EOF) {
+		switch (c) {
+		case 'i':
+			printf("  Net interface = [%s]\n", optarg);
+			device = optarg;
+			break;
 
-            case 't':
-                if (!(cp = strrchr(optarg, '.'))) {
-                    usage(argv[0]);
-                    exit(1);
-                }
-                *cp++ = 0;
+		case 't':
+			if (!(cp = strrchr(optarg, '.'))) {
+				usage(argv[0]);
+				exit(1);
+			}
+			*cp++ = 0;
 
-                igmp_version = (u_short)atoi(optarg);
+			igmp_version = (u_short) atoi(optarg);
 
-                pkt_ptr = igmp_packet_type_find(igmp_version, cp);
-                if (!pkt_ptr) {
-                    printf("ERROR: Packet type %d.%s not found!\n", igmp_version, cp);
-                    usage(argv[0]);
-                    exit(1);
-                }
+			pkt_ptr = igmp_packet_type_find(igmp_version, cp);
+			if (!pkt_ptr) {
+				printf("ERROR: Packet type %d.%s not found!\n",
+				       igmp_version, cp);
+				usage(argv[0]);
+				exit(1);
+			}
 
-                igmp_type = pkt_ptr->igmp_type;
-                igmp_code = pkt_ptr->igmp_code;
-                ip_dst_str = pkt_ptr->igmp_dst;
-                igmp_override = pkt_ptr->group_override_dst;
-                printf("  Packet = [%s] version [%d]\n", pkt_ptr->igmp_tag, igmp_version);
-                break;
+			igmp_type = pkt_ptr->igmp_type;
+			igmp_code = pkt_ptr->igmp_code;
+			ip_dst_str = pkt_ptr->igmp_dst;
+			igmp_override = pkt_ptr->group_override_dst;
+			printf("  Packet = [%s] version [%d]\n",
+			       pkt_ptr->igmp_tag, igmp_version);
+			break;
 
-            case 'g':
-                // Group argument handling logic
-                printf("  Group = [%s]\n", optarg);
-                igmp_group_str = optarg;
-                break;
+		case 'g':
+			// Group argument handling logic
+			printf("  Group = [%s]\n", optarg);
+			igmp_group_str = optarg;
+			break;
 
-            case 'n':
-                // delay between packets in sec
-                break;
+		case 'n':
+			// delay between packets in sec
+			break;
 
-            case 'd':
-                /*
-                 *  We expect the input to be of the form `ip.ip.ip.ip:port`.  We
-                 *  point cp to the last dot of the IP address/port string and
-                 *  then seperate them with a NULL byte.  The optarg now points to
-                 *  just the IP address, and cp points to the port.
-                 */
+		case 'd':
+			/*
+			 *  We expect the input to be of the form `ip.ip.ip.ip:port`.  We
+			 *  point cp to the last dot of the IP address/port string and
+			 *  then seperate them with a NULL byte.  The optarg now points to
+			 *  just the IP address, and cp points to the port.
+			 */
 
-                if ((cp = strrchr(optarg, ':')))
-                {
-                    *cp++ = 0;
-                    dst_prt = (u_short)atoi(cp);
-                } else {
-                    dst_prt = 0;
-                }
-                ip_dst_str = strdup(optarg);
-                printf("  Destination = ip [%s] port [%d]\n", ip_dst_str, dst_prt);
-                break;
+			if ((cp = strrchr(optarg, ':'))) {
+				*cp++ = 0;
+				dst_prt = (u_short) atoi(cp);
+			} else {
+				dst_prt = 0;
+			}
+			ip_dst_str = strdup(optarg);
+			printf("  Destination = ip [%s] port [%d]\n",
+			       ip_dst_str, dst_prt);
+			break;
 
-            case 's':
-                if ((cp = strrchr(optarg, ':')))
-                {
-                    *cp++ = 0;
-                    src_prt = (u_short)atoi(cp);
-                } else {
-                    src_prt = 0;
-                }
-                ip_src_str = strdup(optarg);
-                printf("  Source = ip [%s] port [%d]\n", ip_src_str, src_prt);
-                break;
+		case 's':
+			if ((cp = strrchr(optarg, ':'))) {
+				*cp++ = 0;
+				src_prt = (u_short) atoi(cp);
+			} else {
+				src_prt = 0;
+			}
+			ip_src_str = strdup(optarg);
+			printf("  Source = ip [%s] port [%d]\n", ip_src_str,
+			       src_prt);
+			break;
 
-            default:
-                usage(argv[0]);
-                exit(1);
-        }
-    }
+		default:
+			usage(argv[0]);
+			exit(1);
+		}
+	}
 
-    if (!igmp_group_str)
-    {
-        usage(argv[0]);
-        fprintf(stderr, "ERROR: missing destination IGMP group\n");
-        exit(EXIT_FAILURE);
-    }
+	if (!igmp_group_str) {
+		usage(argv[0]);
+		fprintf(stderr, "ERROR: missing destination IGMP group\n");
+		exit(EXIT_FAILURE);
+	}
 
-    if (!device)
-    {
-        usage(argv[0]);
-        fprintf(stderr, "ERROR: missing device\n");
-        exit(EXIT_FAILURE);
-    }
+	if (!device) {
+		usage(argv[0]);
+		fprintf(stderr, "ERROR: missing device\n");
+		exit(EXIT_FAILURE);
+	}
 
-    printf("done\n");
+	printf("done\n");
 
-    /* Memory initialization */
-    printf("Initializing libnet context...\n");
-    netcontext = libnet_init(LIBNET_RAW4, device, neterr);
-    if (!netcontext) {
-        fprintf(stderr, "%s\n", neterr);
-        exit(1);
-    }
-    libnet_clear_packet(netcontext);
+	/* Memory initialization */
+	printf("Initializing libnet context...\n");
+	netcontext = libnet_init(LIBNET_RAW4, device, neterr);
+	if (!netcontext) {
+		fprintf(stderr, "%s\n", neterr);
+		exit(1);
+	}
+	libnet_clear_packet(netcontext);
 
-    if (!ip_src_str) {
-        ip_src = libnet_get_ipaddr4(netcontext);
-        ip_src_str = libnet_addr2name4(ip_src, LIBNET_DONT_RESOLVE);
-    }
+	if (!ip_src_str) {
+		ip_src = libnet_get_ipaddr4(netcontext);
+		ip_src_str = libnet_addr2name4(ip_src, LIBNET_DONT_RESOLVE);
+	}
 
-    printf("Packet construction...\n");
+	printf("Packet construction...\n");
 
-    /* Packet construction: IGMP */
-    printf("  Building IGMP content...\n");
-    ptag = libnet_build_igmp(
-        igmp_type,        // IGMP type
-        igmp_code,        // IGMP code
-        0,                // checksum
-        0,                // group address
-        NULL,             // payload
-        0,                // payload size
-        netcontext,       // libnet context
-        0                 // ptag
-    );
-    if (ptag == -1) {
-        fprintf(stderr, "Error building IGMP header: %s\n", libnet_geterror(netcontext));
-        libnet_destroy(netcontext);
-        exit(EXIT_FAILURE);
-    }
+	/* Packet construction: IGMP */
+	printf("  Building IGMP content...\n");
+	ptag = libnet_build_igmp(igmp_type,	// IGMP type
+				 igmp_code,	// IGMP code
+				 0,	// checksum
+				 0,	// group address
+				 NULL,	// payload
+				 0,	// payload size
+				 netcontext,	// libnet context
+				 0	// ptag
+	    );
+	if (ptag == -1) {
+		fprintf(stderr, "Error building IGMP header: %s\n",
+			libnet_geterror(netcontext));
+		libnet_destroy(netcontext);
+		exit(EXIT_FAILURE);
+	}
 
-    printf("  done\n");
+	printf("  done\n");
 
-    /* Send packet */
-    if (libnet_write(netcontext) == -1) {
-        fprintf(stderr, "Error sending packet: %s\n", libnet_geterror(netcontext));
-    } else {
-        printf("Packet sent successfully.\n");
-    }
+	/* Send packet */
+	if (libnet_write(netcontext) == -1) {
+		fprintf(stderr, "Error sending packet: %s\n",
+			libnet_geterror(netcontext));
+	} else {
+		printf("Packet sent successfully.\n");
+	}
 
-    printf("Packet construction...\n");
+	printf("Packet construction...\n");
 
-    /*
-     *  Packet construction : IGMP
-     */
-    printf("  Building IGMP content...\n");
+	/*
+	 *  Packet construction : IGMP
+	 */
+	printf("  Building IGMP content...\n");
 
-    // Override dest with group info when needed
-    if (igmp_override) {
-        ip_dst_str = igmp_group_str;
-    }
+	// Override dest with group info when needed
+	if (igmp_override) {
+		ip_dst_str = igmp_group_str;
+	}
 
-    switch ( igmp_type ) {
-        case 0x11: // IGMP_MEMBERSHIP_QUERY
-            if (igmp_version == 2){
-                // group specific
-            } else if (igmp_version == 1) {
-                // general
-                igmp_group = 0;
-                igmp_group_str = "0.0.0.0";
-                igmp_group_test = 0;
-            }
-            // DST = 224.0.0.1
-            //igmp_group = 0;
-            //igmp_group_test = 0;
-            break;
-        case 0x12: //
-        default:
-            break;
-    }
+	switch (igmp_type) {
+	case 0x11:		// IGMP_MEMBERSHIP_QUERY
+		if (igmp_version == 2) {
+			// group specific
+		} else if (igmp_version == 1) {
+			// general
+			igmp_group = 0;
+			igmp_group_str = "0.0.0.0";
+			igmp_group_test = 0;
+		}
+		// DST = 224.0.0.1
+		//igmp_group = 0;
+		//igmp_group_test = 0;
+		break;
+	case 0x12:		//
+	default:
+		break;
+	}
 
-    if (ip_src_test
-            && !(ip_src = libnet_name2addr4(netcontext, ip_src_str, LIBNET_RESOLVE)))
-    {
-        fprintf(stderr,"Bad source IP address: %s\n", ip_src_str);
-        fprintf(stderr,"%s\n", libnet_geterror(netcontext));
-        exit(1);
-    }
+	if (ip_src_test
+	    && !(ip_src =
+		 libnet_name2addr4(netcontext, ip_src_str, LIBNET_RESOLVE))) {
+		fprintf(stderr, "Bad source IP address: %s\n", ip_src_str);
+		fprintf(stderr, "%s\n", libnet_geterror(netcontext));
+		exit(1);
+	}
 
-    if (ip_dst_test 
-            && !(ip_dst = libnet_name2addr4(netcontext, ip_dst_str, LIBNET_RESOLVE)))
-    {
-        fprintf(stderr,"Bad destination IP address: %s\n", ip_dst_str);
-        fprintf(stderr,"%s\n", libnet_geterror(netcontext));
-        exit(1);
-    }
+	if (ip_dst_test
+	    && !(ip_dst =
+		 libnet_name2addr4(netcontext, ip_dst_str, LIBNET_RESOLVE))) {
+		fprintf(stderr, "Bad destination IP address: %s\n", ip_dst_str);
+		fprintf(stderr, "%s\n", libnet_geterror(netcontext));
+		exit(1);
+	}
 
-    if (igmp_group_test && !(igmp_group = libnet_name2addr4(netcontext, igmp_group_str, LIBNET_RESOLVE)))
-    {
-        fprintf(stderr,"Bad group IP address: %s\n", optarg);
-        fprintf(stderr,"%s\n", libnet_geterror(netcontext));
-        exit(1);
-    }
+	if (igmp_group_test
+	    && !(igmp_group =
+		 libnet_name2addr4(netcontext, igmp_group_str, LIBNET_RESOLVE)))
+	{
+		fprintf(stderr, "Bad group IP address: %s\n", optarg);
+		fprintf(stderr, "%s\n", libnet_geterror(netcontext));
+		exit(1);
+	}
 
-    printf("    IP SRC IP  = %s\n", ip_src_str);
-    printf("    IP DEST IP = %s\n", ip_dst_str);
-    printf("    IGMP TYPE  = 0x%02x\n", igmp_type);
-    printf("    IGMP CODE  = 0x%02x\n", igmp_code);
-    printf("    IGMP GROUP = %s\n", igmp_group_str);
-    printf("    GROUP TEST = %d\n", igmp_group_test);
+	printf("    IP SRC IP  = %s\n", ip_src_str);
+	printf("    IP DEST IP = %s\n", ip_dst_str);
+	printf("    IGMP TYPE  = 0x%02x\n", igmp_type);
+	printf("    IGMP CODE  = 0x%02x\n", igmp_code);
+	printf("    IGMP GROUP = %s\n", igmp_group_str);
+	printf("    GROUP TEST = %d\n", igmp_group_test);
 
-    /*
-       int test = 1;
-       if ( *(char *) test == 1) {
-    // little endian
-    printf("little endian\n");
-    } else {
-    // big endian
-    printf("big endian\n");
-    }
-    */
+	/*
+	   int test = 1;
+	   if ( *(char *) test == 1) {
+	   // little endian
+	   printf("little endian\n");
+	   } else {
+	   // big endian
+	   printf("big endian\n");
+	   }
+	 */
 
-    ptag = libnet_build_igmp(
-            igmp_type,              // IGMP type 
-            igmp_code,              // IGMP code or TTL 
-            0,                      // checksum
-            htonl(igmp_group),                // ip addr 
-            NULL,                      // Ptr to packet data (or null) 
-            0,                      // Packet payload length 
-            netcontext,             // Ptr to libnet context
-            0);                     // Build a new packet header
-    if (ptag < 0)
-    { 
-        fprintf(stderr, "Error while building IGMP header data (err %d)\n", ptag);
-        fprintf(stderr,"%s\n", libnet_geterror(netcontext));
-        exit(1);
-    }
+	ptag = libnet_build_igmp(igmp_type,	// IGMP type 
+				 igmp_code,	// IGMP code or TTL 
+				 0,	// checksum
+				 htonl(igmp_group),	// ip addr 
+				 NULL,	// Ptr to packet data (or null) 
+				 0,	// Packet payload length 
+				 netcontext,	// Ptr to libnet context
+				 0);	// Build a new packet header
+	if (ptag < 0) {
+		fprintf(stderr,
+			"Error while building IGMP header data (err %d)\n",
+			ptag);
+		fprintf(stderr, "%s\n", libnet_geterror(netcontext));
+		exit(1);
+	}
 
+	u_int8_t ipopt[2];
+	ipopt[0] = IPOPT_RA;
+	ipopt[1] = 4;
+	ptag = libnet_build_ipv4_options(ipopt,	// options
+					 2,	// options_s (length of option string)
+					 netcontext,	// libnet context
+					 0	// ptag
+	    );
+	if (ptag < 0) {
+		fprintf(stderr,
+			"Error while building IPv4 options data (err %d)\n",
+			ptag);
+	}
 
-    u_int8_t ipopt[2];
-    ipopt[0] = IPOPT_RA;
-    ipopt[1] = 4;
-    ptag = libnet_build_ipv4_options(
-            ipopt,       // options
-            2,           // options_s (length of option string)
-            netcontext,  // libnet context
-            0         // ptag
-            );                
-    if (ptag < 0)
-    { 
-        fprintf(stderr, "Error while building IPv4 options data (err %d)\n", ptag);
-    }
+	ptag = libnet_build_ipv4(LIBNET_IPV4_H + LIBNET_IGMP_H,	// pkg size + data
+				 0,	// IP tos
+				 getpid(),	// IP ID
+				 IP_DF,	// frag flags and offset
+				 1,	// TTL
+				 IPPROTO_IGMP,	// transport protocol
+				 0,	// checksum
+				 ip_src,	// source IP
+				 ip_dst,	// destination IP
+				 NULL,	// payload (none)
+				 0,	// payload length
+				 netcontext,	// libnet context
+				 0	// build a new header
+	    );
+	if (ptag < 0) {
+		fprintf(stderr,
+			"Error while building IPv4 header data (err %d)\n",
+			ptag);
+		fprintf(stderr, "%s\n", libnet_geterror(netcontext));
+		exit(1);
+	}
 
-    ptag = libnet_build_ipv4(LIBNET_IPV4_H + LIBNET_IGMP_H,  // pkg size + data
-            0,         // IP tos
-            getpid(),  // IP ID
-            IP_DF,         // frag flags and offset
-            1,         // TTL
-            IPPROTO_IGMP,           // transport protocol
-            0,                      // checksum
-            ip_src,                 // source IP
-            ip_dst,                 // destination IP
-            NULL,                   // payload (none)
-            0,                      // payload length
-            netcontext,             // libnet context
-            0                       // build a new header
-            );                
-    if (ptag < 0)
-    { 
-        fprintf(stderr, "Error while building IPv4 header data (err %d)\n", ptag);
-        fprintf(stderr,"%s\n", libnet_geterror(netcontext));
-        exit(1);
-    }
+	printf("  done\n");	//IGMP content
 
-    printf("  done\n"); //IGMP content
+	c = libnet_write(netcontext);
+	if (c < 0) {
+		fprintf(stderr, "%s\n", libnet_geterror(netcontext));
+	} else {
+		printf
+		    ("construction and injection completed, wrote all %d bytes\n",
+		     c);
+	}
 
-    c = libnet_write(netcontext);
-    if (c < 0)
-    {
-        fprintf(stderr,"%s\n", libnet_geterror(netcontext));
-    }
-    else
-    {
-        printf("construction and injection completed, wrote all %d bytes\n", c);
-    } 
+	/*
+	 *  Free packet memory.
+	 */
+	libnet_diag_dump_pblock(netcontext);
+	libnet_destroy(netcontext);
+	exit(0);
 
-    /*
-     *  Free packet memory.
-     */
-    libnet_diag_dump_pblock(netcontext);
-    libnet_destroy(netcontext);
-    exit(0);
-
-    return (c == -1 ? EXIT_FAILURE : EXIT_SUCCESS);
+	return (c == -1 ? EXIT_FAILURE : EXIT_SUCCESS);
 }
 
 // vim: ts=4 sts=4 sw=4 et

src/usage.c

@@ -7,24 +7,30 @@
 
 void usage(const char *name)
 {
-    ipg_igmp_extra_t *pkt_ptr;
+	ipg_igmp_extra_t *pkt_ptr;
 
-    fprintf(stderr, "Usage: %s [options]\n", basename(name));
-    fprintf(stderr, "\nOptions:\n");
-    fprintf(stderr, "  -i <interface>   Specify the network interface (e.g., eth0)\n");
-    fprintf(stderr, "  -t <type>        Specify the IGMP packet type and version (e.g., 1.query)\n");
-    fprintf(stderr, "  -g <group>       Specify the destination IGMP group (e.g., 224.0.0.1)\n");
-    fprintf(stderr, "  -s <source>      Specify the source IP and port (e.g., 192.168.1.1:1234)\n");
-    fprintf(stderr, "  -d <destination> Specify the destination IP and port (e.g., 224.0.0.2:5678)\n");
-    fprintf(stderr, "  -n <number>      Specify delay between packets in seconds (optional)\n");
+	fprintf(stderr, "Usage: %s [options]\n", basename(name));
+	fprintf(stderr, "\nOptions:\n");
+	fprintf(stderr,
+		"  -i <interface>   Specify the network interface (e.g., eth0)\n");
+	fprintf(stderr,
+		"  -t <type>        Specify the IGMP packet type and version (e.g., 1.query)\n");
+	fprintf(stderr,
+		"  -g <group>       Specify the destination IGMP group (e.g., 224.0.0.1)\n");
+	fprintf(stderr,
+		"  -s <source>      Specify the source IP and port (e.g., 192.168.1.1:1234)\n");
+	fprintf(stderr,
+		"  -d <destination> Specify the destination IP and port (e.g., 224.0.0.2:5678)\n");
+	fprintf(stderr,
+		"  -n <number>      Specify delay between packets in seconds (optional)\n");
 
-    fprintf(stderr, "\nAvailable IGMP packet types:\n");
+	fprintf(stderr, "\nAvailable IGMP packet types:\n");
 
-    pkt_ptr = g_igmp_pkts;
-    while(pkt_ptr->igmp_version || pkt_ptr->igmp_tag){
-        fprintf(stderr," - %d.%s\n", pkt_ptr->igmp_version, pkt_ptr->igmp_tag);
-        pkt_ptr++; 
-    }
-    fprintf(stderr, "\n");
+	pkt_ptr = g_igmp_pkts;
+	while (pkt_ptr->igmp_version || pkt_ptr->igmp_tag) {
+		fprintf(stderr, " - %d.%s\n", pkt_ptr->igmp_version,
+			pkt_ptr->igmp_tag);
+		pkt_ptr++;
+	}
+	fprintf(stderr, "\n");
 }
-