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Annotation of embedaddon/hping2/send.c, revision 1.1

1.1     ! misho       1: /* 
        !             2:  * $smu-mark$ 
        !             3:  * $name: sendudp.c$ 
        !             4:  * $author: Salvatore Sanfilippo <antirez@invece.org>$ 
        !             5:  * $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$ 
        !             6:  * $license: This software is under GPL version 2 of license$ 
        !             7:  * $date: Fri Nov  5 11:55:49 MET 1999$ 
        !             8:  * $rev: 8$ 
        !             9:  */ 
        !            10: 
        !            11: /* $Id: send.c,v 1.6 2003/08/01 14:53:08 antirez Exp $ */
        !            12: 
        !            13: #include <stdio.h>
        !            14: #include <string.h>
        !            15: #include <stdlib.h>
        !            16: #include <sys/time.h>
        !            17: #include <unistd.h>
        !            18: #include <signal.h>
        !            19: #include <errno.h>
        !            20: 
        !            21: #include "hping2.h"
        !            22: #include "globals.h"
        !            23: 
        !            24: static void select_next_random_source(void)
        !            25: {
        !            26:        unsigned char ra[4];
        !            27: 
        !            28:        ra[0] = hp_rand() & 0xFF;
        !            29:        ra[1] = hp_rand() & 0xFF;
        !            30:        ra[2] = hp_rand() & 0xFF;
        !            31:        ra[3] = hp_rand() & 0xFF;
        !            32:        memcpy(&local.sin_addr.s_addr, ra, 4);
        !            33: 
        !            34:        if (opt_debug)
        !            35:                printf("DEBUG: the source address is %u.%u.%u.%u\n",
        !            36:                    ra[0], ra[1], ra[2], ra[3]);
        !            37: }
        !            38: 
        !            39: static void select_next_random_dest(void)
        !            40: {
        !            41:        unsigned char ra[4];
        !            42:        char a[4], b[4], c[4], d[4];
        !            43: 
        !            44:        if (sscanf(targetname, "%4[^.].%4[^.].%4[^.].%4[^.]", a, b, c, d) != 4)
        !            45:        {
        !            46:                fprintf(stderr,
        !            47:                        "wrong --rand-dest target host, correct examples:\n"
        !            48:                        "  x.x.x.x, 192,168.x.x, 128.x.x.255\n"
        !            49:                        "you typed: %s\n", targetname);
        !            50:                exit(1);
        !            51:        }
        !            52:        a[3] = b[3] = c[3] = d[3] = '\0';
        !            53: 
        !            54:        ra[0] = a[0] == 'x' ? (hp_rand() & 0xFF) : strtoul(a, NULL, 0);
        !            55:        ra[1] = b[0] == 'x' ? (hp_rand() & 0xFF) : strtoul(b, NULL, 0);
        !            56:        ra[2] = c[0] == 'x' ? (hp_rand() & 0xFF) : strtoul(c, NULL, 0);
        !            57:        ra[3] = d[0] == 'x' ? (hp_rand() & 0xFF) : strtoul(d, NULL, 0);
        !            58:        memcpy(&remote.sin_addr.s_addr, ra, 4);
        !            59: 
        !            60:        if (opt_debug) {
        !            61:                printf("DEBUG: the dest address is %u.%u.%u.%u\n",
        !            62:                                ra[0], ra[1], ra[2], ra[3]);
        !            63:        }
        !            64: }
        !            65: 
        !            66: /* The signal handler for SIGALRM will send the packets */
        !            67: void send_packet (int signal_id)
        !            68: {
        !            69:        int errno_save = errno;
        !            70: 
        !            71:        if (opt_rand_dest)
        !            72:                select_next_random_dest();
        !            73:        if (opt_rand_source)
        !            74:                select_next_random_source();
        !            75: 
        !            76:        if (opt_rawipmode)      send_rawip();
        !            77:        else if (opt_icmpmode)  send_icmp();
        !            78:        else if (opt_udpmode)   send_udp();
        !            79:        else                    send_tcp();
        !            80: 
        !            81:        sent_pkt++;
        !            82:        Signal(SIGALRM, send_packet);
        !            83: 
        !            84:        if (count != -1 && count == sent_pkt) { /* count reached? */
        !            85:                Signal(SIGALRM, print_statistics);
        !            86:                alarm(COUNTREACHED_TIMEOUT);
        !            87:        } else if (!opt_listenmode) {
        !            88:                if (opt_waitinusec == FALSE)
        !            89:                        alarm(sending_wait);
        !            90:                else
        !            91:                        setitimer(ITIMER_REAL, &usec_delay, NULL);
        !            92:        }
        !            93:        errno = errno_save;
        !            94: }