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Annotation of embedaddon/hping2/send.c, revision 1.1.1.1

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: }