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udpdump.c
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Upload User: hepax88
Upload Date: 2007-01-03
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Code Size: 1k
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TCP/IP Stack

Development Platform:

Visual C++

udpdump.c：Code Content
  1. /* UDP packet tracing
  2.  * Copyright 1991 Phil Karn, KA9Q
  3.  */
  4. #include <stdio.h>
  5. #include "global.h"
  6. #include "mbuf.h"
  7. #include "netuser.h"
  8. #include "internet.h"
  9. #include "udp.h"
  10. #include "ip.h"
  11. #include "socket.h"
  12. #include "trace.h"
  14. /* Dump a UDP header */
  15. void
  16. udp_dump(fp,bpp,source,dest,check)
  17. FILE *fp;
  18. struct mbuf **bpp;
  19. int32 source,dest;
  20. int check; /* If 0, bypass checksum verify */
  21. {
  22. struct udp udp;
  23. struct pseudo_header ph;
  24. uint16 csum;
  26. if(bpp == NULL || *bpp == NULL)
  27. return;
  29. fprintf(fp,"UDP:");
  31. /* Compute checksum */
  32. ph.source = source;
  33. ph.dest = dest;
  34. ph.protocol = UDP_PTCL;
  35. ph.length = len_p(*bpp);
  36. if((csum = cksum(&ph,*bpp,ph.length)) == 0)
  37. check = 0; /* No checksum error */
  39. ntohudp(&udp,bpp);
  41. fprintf(fp," len %u",udp.length);
  42. fprintf(fp," %u->%u",udp.source,udp.dest);
  43. if(udp.length > UDPHDR)
  44. fprintf(fp," Data %u",udp.length - UDPHDR);
  45. if(udp.checksum == 0)
  46. check = 0;
  47. if(check)
  48. fprintf(fp," CHECKSUM ERROR (%u)",csum);
  50. putc('n',fp);
  52. switch(udp.dest){
  53. case IPPORT_RIP:
  54. rip_dump(fp,bpp);
  55. }
  57. }