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icmpdump.c
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Upload User: hepax88
Upload Date: 2007-01-03
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Code Size: 2k
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TCP/IP Stack

Development Platform:

Visual C++

icmpdump.c：Code Content
  1. /* ICMP header tracing
  2.  * Copyright 1991 Phil Karn, KA9Q
  3.  */
  4. #include <stdio.h>
  5. #include "global.h"
  6. #include "mbuf.h"
  7. #include "internet.h"
  8. #include "netuser.h"
  9. #include "icmp.h"
  10. #include "trace.h"
  11. #include "ip.h"
  13. /* Dump an ICMP header */
  14. void
  15. icmp_dump(fp,bpp,source,dest,check)
  16. FILE *fp;
  17. struct mbuf **bpp;
  18. int32 source,dest;
  19. int check; /* If 0, bypass checksum verify */
  20. {
  21. struct icmp icmp;
  22. uint16 csum;
  24. if(bpp == NULL || *bpp == NULL)
  25. return;
  26. csum = cksum(NULL,*bpp,len_p(*bpp));
  28. ntohicmp(&icmp,bpp);
  30. fprintf(fp,"ICMP: type %s",smsg(Icmptypes,ICMP_TYPES,icmp.type));
  32. switch(icmp.type){
  33. case ICMP_DEST_UNREACH:
  34. fprintf(fp," code %s",smsg(Unreach,NUNREACH,icmp.code));
  35. break;
  36. case ICMP_REDIRECT:
  37. fprintf(fp," code %s",smsg(Redirect,NREDIRECT,icmp.code));
  38. fprintf(fp," new gateway %s",inet_ntoa(icmp.args.address));
  39. break;
  40. case ICMP_TIME_EXCEED:
  41. fprintf(fp," code %s",smsg(Exceed,NEXCEED,icmp.code));
  42. break;
  43. case ICMP_PARAM_PROB:
  44. fprintf(fp," pointer %u",icmp.args.pointer);
  45. break;
  46. case ICMP_ECHO:
  47. case ICMP_ECHO_REPLY:
  48. case ICMP_INFO_RQST:
  49. case ICMP_INFO_REPLY:
  50. case ICMP_TIMESTAMP:
  51. case ICMP_TIME_REPLY:
  52. fprintf(fp," id %u seq %u",icmp.args.echo.id,icmp.args.echo.seq);
  53. break;
  54. case ICMP_IPSP:
  55. fprintf(fp," %s",smsg(Said_icmp,NIPSP,icmp.code));
  56. break;
  57. }
  58. if(check && csum != 0){
  59. fprintf(fp," CHECKSUM ERROR (%u)",csum);
  60. }
  61. putc('n',fp);
  62. /* Dump the offending IP header, if any */
  63. switch(icmp.type){
  64. case ICMP_DEST_UNREACH:
  65. case ICMP_TIME_EXCEED:
  66. case ICMP_PARAM_PROB:
  67. case ICMP_QUENCH:
  68. case ICMP_REDIRECT:
  69. case ICMP_IPSP:
  70. fprintf(fp,"Returned ");
  71. ip_dump(fp,bpp,0);
  72. }
  73. }