Probleme Socket Raw

Probleme Socket Raw - C - Programmation

Marsh Posté le 28-11-2007 à 18:57:15    

Bonjour,
Je voudrais envoyer un paquet TCP via une socket raw à un client.
Voici le code (je n'ai pas mi toutes les déclarations pour que ce soit plus lisible)
 

Code :
  1. #define DATAGRAM_SIZE 4096
  2. csum (unsigned short *buf, int nwords)
  3. {
  4.   unsigned long sum;
  5.   for (sum = 0; nwords > 0; nwords--)
  6.     sum += *buf++;
  7.   sum = (sum >> 16) + (sum & 0xffff);
  8.   sum += (sum >> 16);
  9.   return ~sum;
  10. }
  12. typedef struct iphdr//20 octects
  13. {
  14. unsigned char verlen;//1 = version + longueur
  15. unsigned char tos;   //1
  16. unsigned short tot_len; //2
  17. unsigned short id;      //2
  18. unsigned short offset;  //2
  19. unsigned char ttl;     //1
  20. unsigned char protocol;//1
  21. unsigned short checksum; //2
  22. unsigned int saddr; //4
  23. unsigned int daddr; //4
  24. } IP_HDR;
  26. typedef struct tcphdr
  27. {
  28. unsigned short sport;
  29. unsigned short dport;
  30. unsigned int seqnum;
  31. unsigned int acknum;
  32. unsigned char unused:4, tcp_hl:4;
  33. unsigned char flags;
  34. unsigned short window;
  35. unsigned short checksum;
  36. unsigned short urgPointer;
  37. } TCP_HDR;
  39. ListeningSocketSDP = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
  41. if (setsockopt(ListeningSocketSDP, IPPROTO_IP, IP_HDRINCL, (char *)&optval, sizeof(optval)) == SOCKET_ERROR)
  42. {
  43.      printf("[Error] . Function setsockopt() : %d\n", WSAGetLastError());
  44.  WSACleanup();
  45.      exit(-1);
  46. }
  47. ServerAddrSDP.sin_family    =  AF_INET;
  48. ServerAddrSDP.sin_port        =  htons(5004);
  49. ServerAddrSDP.sin_addr.s_addr   =  inet_addr("192.168.0.115" );
  51. ClientAddrSDP.sin_family    =  AF_INET;
  52. ClientAddrSDP.sin_port        =  htons(5008);
  53. ClientAddrSDP.sin_addr.s_addr   =  inet_addr("192.168.0.104" );
  54. //construction du faux paquet TCP...
  55. memset(datagram,0,DATAGRAM_SIZE);
  57. iph->verlen = 69;//version + longueur sur 1 octect (4 et 20)
  58. iph->tos = 0;//0x20;//calculer par windows
  59. iph->tot_len = sizeof(IP_HDR) + sizeof(TCP_HDR);// longueur du datagrame : calculer par win
  60. iph->id = htons(8306);
  61. //flags
  62. iph->offset = 0;
  63. iph->ttl = 57;
  64. iph->protocol = IPPROTO_TCP;
  65. iph->checksum = 0;
  66. iph->saddr = ServerAddrSDP.sin_addr.s_addr;
  67. iph->daddr = ClientAddrSDP.sin_addr.s_addr;
  69. ////paquetTCP = malloc(5 * sizeof(unsigned int));
  70. tcph->sport = htons(5004);
  71. tcph->dport = htons(5008);
  72. tcph->seqnum = htonl(0);
  73. tcph->acknum = 0;
  74. tcph->tcp_hl = 20;
  75. tcph->flags = 0x18;
  76. tcph->window = htons(6432);
  77. tcph->checksum = 0;
  78. tcph->urgPointer = 0;
  80. iph->checksum = csum ((unsigned short *) datagram, iph->tot_len >> 1);
  82. if((numbytes = sendto(ListeningSocketSDP,(const char *)datagram, iph->tot_len , 0, (struct sockaddr *)&ClientAddrSDP, ClientAddrLen)) == -1)
  83. {
  84.  perror("sendto" );
  85. }


 
numbytes = -1 à la sortie :(
je ne comprend pas d'ou vient l'erreur.  
le setsockoption est bon ? j'ai bien le droit de dire de cette manière que je veux un paquet TCP/IP ?
merci à tous ceux qui me répondront :)

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Marsh Posté le 28-11-2007 à 18:57:15   

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Marsh Posté le 28-11-2007 à 19:58:46    

http://www.frameip.com/forum/94-ra [...] xp-sp2.htm
 
apparemment les socket raw tcp/ip ne fonctionne plus sous xp sp2 !

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