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kernel_linux.c
资源名称：net-snmp-5.2.2.rar　[点击查看]
上传用户：wxp200602
上传日期：2007-10-30
资源大小：4028k
文件大小：7k
源码类别：

SNMP编程

开发平台：

Unix_Linux

kernel_linux.c：源码内容
  1. /*
  2.  *  Linux kernel interface
  3.  *
  4.  */
  6. #include <net-snmp/net-snmp-config.h>
  7. #include <net-snmp/net-snmp-includes.h>
  8. #include <net-snmp/agent/net-snmp-agent-includes.h>
  10. #include "util_funcs.h"
  12. #if HAVE_STRING_H
  13. #include <string.h>
  14. #endif
  15. #include <sys/types.h>
  16. #if HAVE_SYS_PARAM_H
  17. #include <sys/param.h>
  18. #endif
  20. #include "kernel_linux.h"
  22. struct ip_mib   cached_ip_mib;
  23. struct icmp_mib cached_icmp_mib;
  24. struct tcp_mib  cached_tcp_mib;
  25. struct udp_mib  cached_udp_mib;
  27. #define IP_STATS_LINE "Ip: %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu"
  28. #define ICMP_STATS_LINE "Icmp: %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu"
  29. #define TCP_STATS_LINE "Tcp: %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu"
  30. #define UDP_STATS_LINE "Udp: %lu %lu %lu %lu"
  32. #define IP_STATS_PREFIX_LEN 4
  33. #define ICMP_STATS_PREFIX_LEN 6
  34. #define TCP_STATS_PREFIX_LEN 5
  35. #define UDP_STATS_PREFIX_LEN 5
  38. int
  39. linux_read_mibII_stats(void)
  40. {
  41.     FILE           *in = fopen("/proc/net/snmp", "r");
  42.     char            line[1024];
  44.     if (!in) {
  45.         return -1;
  46.     }
  49.     while (line == fgets(line, sizeof(line), in)) {
  50.         if (!strncmp(line, IP_STATS_LINE, IP_STATS_PREFIX_LEN)) {
  51.             sscanf(line, IP_STATS_LINE,
  52.                    &cached_ip_mib.ipForwarding,
  53.                    &cached_ip_mib.ipDefaultTTL,
  54.                    &cached_ip_mib.ipInReceives,
  55.                    &cached_ip_mib.ipInHdrErrors,
  56.                    &cached_ip_mib.ipInAddrErrors,
  57.                    &cached_ip_mib.ipForwDatagrams,
  58.                    &cached_ip_mib.ipInUnknownProtos,
  59.                    &cached_ip_mib.ipInDiscards,
  60.                    &cached_ip_mib.ipInDelivers,
  61.                    &cached_ip_mib.ipOutRequests,
  62.                    &cached_ip_mib.ipOutDiscards,
  63.                    &cached_ip_mib.ipOutNoRoutes,
  64.                    &cached_ip_mib.ipReasmTimeout,
  65.                    &cached_ip_mib.ipReasmReqds,
  66.                    &cached_ip_mib.ipReasmOKs,
  67.                    &cached_ip_mib.ipReasmFails,
  68.                    &cached_ip_mib.ipFragOKs,
  69.                    &cached_ip_mib.ipFragFails,
  70.                    &cached_ip_mib.ipFragCreates);
  71.             cached_ip_mib.ipRoutingDiscards = 0;        /* XXX */
  72.         } else if (!strncmp(line, ICMP_STATS_LINE, ICMP_STATS_PREFIX_LEN)) {
  73.             sscanf(line, ICMP_STATS_LINE,
  74.                    &cached_icmp_mib.icmpInMsgs,
  75.                    &cached_icmp_mib.icmpInErrors,
  76.                    &cached_icmp_mib.icmpInDestUnreachs,
  77.                    &cached_icmp_mib.icmpInTimeExcds,
  78.                    &cached_icmp_mib.icmpInParmProbs,
  79.                    &cached_icmp_mib.icmpInSrcQuenchs,
  80.                    &cached_icmp_mib.icmpInRedirects,
  81.                    &cached_icmp_mib.icmpInEchos,
  82.                    &cached_icmp_mib.icmpInEchoReps,
  83.                    &cached_icmp_mib.icmpInTimestamps,
  84.                    &cached_icmp_mib.icmpInTimestampReps,
  85.                    &cached_icmp_mib.icmpInAddrMasks,
  86.                    &cached_icmp_mib.icmpInAddrMaskReps,
  87.                    &cached_icmp_mib.icmpOutMsgs,
  88.                    &cached_icmp_mib.icmpOutErrors,
  89.                    &cached_icmp_mib.icmpOutDestUnreachs,
  90.                    &cached_icmp_mib.icmpOutTimeExcds,
  91.                    &cached_icmp_mib.icmpOutParmProbs,
  92.                    &cached_icmp_mib.icmpOutSrcQuenchs,
  93.                    &cached_icmp_mib.icmpOutRedirects,
  94.                    &cached_icmp_mib.icmpOutEchos,
  95.                    &cached_icmp_mib.icmpOutEchoReps,
  96.                    &cached_icmp_mib.icmpOutTimestamps,
  97.                    &cached_icmp_mib.icmpOutTimestampReps,
  98.                    &cached_icmp_mib.icmpOutAddrMasks,
  99.                    &cached_icmp_mib.icmpOutAddrMaskReps);
  100.         } else if (!strncmp(line, TCP_STATS_LINE, TCP_STATS_PREFIX_LEN)) {
  101.             int             ret = sscanf(line, TCP_STATS_LINE,
  102.                                          &cached_tcp_mib.tcpRtoAlgorithm,
  103.                                          &cached_tcp_mib.tcpRtoMin,
  104.                                          &cached_tcp_mib.tcpRtoMax,
  105.                                          &cached_tcp_mib.tcpMaxConn,
  106.                                          &cached_tcp_mib.tcpActiveOpens,
  107.                                          &cached_tcp_mib.tcpPassiveOpens,
  108.                                          &cached_tcp_mib.tcpAttemptFails,
  109.                                          &cached_tcp_mib.tcpEstabResets,
  110.                                          &cached_tcp_mib.tcpCurrEstab,
  111.                                          &cached_tcp_mib.tcpInSegs,
  112.                                          &cached_tcp_mib.tcpOutSegs,
  113.                                          &cached_tcp_mib.tcpRetransSegs,
  114.                                          &cached_tcp_mib.tcpInErrs,
  115.                                          &cached_tcp_mib.tcpOutRsts);
  116.             cached_tcp_mib.tcpInErrsValid = (ret > 12) ? 1 : 0;
  117.             cached_tcp_mib.tcpOutRstsValid = (ret > 13) ? 1 : 0;
  118.         } else if (!strncmp(line, UDP_STATS_LINE, UDP_STATS_PREFIX_LEN)) {
  119.             sscanf(line, UDP_STATS_LINE,
  120.                    &cached_udp_mib.udpInDatagrams,
  121.                    &cached_udp_mib.udpNoPorts,
  122.                    &cached_udp_mib.udpInErrors,
  123.                    &cached_udp_mib.udpOutDatagrams);
  124.         }
  125.     }
  126.     fclose(in);
  128.     /*
  129.      * Tweak illegal values:
  130.      *
  131.      * valid values for ipForwarding are 1 == yup, 2 == nope
  132.      * a 0 is forbidden, so patch:
  133.      */
  134.     if (!cached_ip_mib.ipForwarding)
  135.         cached_ip_mib.ipForwarding = 2;
  137.     /*
  138.      * 0 is illegal for tcpRtoAlgorithm
  139.      * so assume `other' algorithm:
  140.      */
  141.     if (!cached_tcp_mib.tcpRtoAlgorithm)
  142.         cached_tcp_mib.tcpRtoAlgorithm = 1;
  143.     return 0;
  144. }
  146. int
  147. linux_read_ip_stat(struct ip_mib *ipstat)
  148. {
  149.     memset((char *) ipstat, (0), sizeof(*ipstat));
  150.     if (linux_read_mibII_stats() == -1)
  151.         return -1;
  152.     memcpy((char *) ipstat, (char *) &cached_ip_mib, sizeof(*ipstat));
  153.     return 0;
  154. }
  156. int
  157. linux_read_icmp_stat(struct icmp_mib *icmpstat)
  158. {
  159.     memset((char *) icmpstat, (0), sizeof(*icmpstat));
  160.     if (linux_read_mibII_stats() == -1)
  161.         return -1;
  162.     memcpy((char *) icmpstat, (char *) &cached_icmp_mib,
  163.            sizeof(*icmpstat));
  164.     return 0;
  165. }
  167. int
  168. linux_read_tcp_stat(struct tcp_mib *tcpstat)
  169. {
  170.     memset((char *) tcpstat, (0), sizeof(*tcpstat));
  171.     if (linux_read_mibII_stats() == -1)
  172.         return -1;
  173.     memcpy((char *) tcpstat, (char *) &cached_tcp_mib, sizeof(*tcpstat));
  174.     return 0;
  175. }
  177. int
  178. linux_read_udp_stat(struct udp_mib *udpstat)
  179. {
  180.     memset((char *) udpstat, (0), sizeof(*udpstat));
  181.     if (linux_read_mibII_stats() == -1)
  182.         return -1;
  183.     memcpy((char *) udpstat, (char *) &cached_udp_mib, sizeof(*udpstat));
  184.     return 0;
  185. }