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/*
* Linux kernel interface
*
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "util_funcs.h"
#if HAVE_STRING_H
#include <string.h>
#endif
#include <sys/types.h>
#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include "kernel_linux.h"
struct ip_mib cached_ip_mib;
struct icmp_mib cached_icmp_mib;
struct tcp_mib cached_tcp_mib;
struct udp_mib cached_udp_mib;
#define IP_STATS_LINE "Ip: %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu"
#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"
#define TCP_STATS_LINE "Tcp: %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu"
#define UDP_STATS_LINE "Udp: %lu %lu %lu %lu"
#define IP_STATS_PREFIX_LEN 4
#define ICMP_STATS_PREFIX_LEN 6
#define TCP_STATS_PREFIX_LEN 5
#define UDP_STATS_PREFIX_LEN 5
int
linux_read_mibII_stats(void)
{
FILE *in = fopen("/proc/net/snmp", "r");
char line[1024];
if (!in) {
return -1;
}
while (line == fgets(line, sizeof(line), in)) {
if (!strncmp(line, IP_STATS_LINE, IP_STATS_PREFIX_LEN)) {
sscanf(line, IP_STATS_LINE,
&cached_ip_mib.ipForwarding,
&cached_ip_mib.ipDefaultTTL,
&cached_ip_mib.ipInReceives,
&cached_ip_mib.ipInHdrErrors,
&cached_ip_mib.ipInAddrErrors,
&cached_ip_mib.ipForwDatagrams,
&cached_ip_mib.ipInUnknownProtos,
&cached_ip_mib.ipInDiscards,
&cached_ip_mib.ipInDelivers,
&cached_ip_mib.ipOutRequests,
&cached_ip_mib.ipOutDiscards,
&cached_ip_mib.ipOutNoRoutes,
&cached_ip_mib.ipReasmTimeout,
&cached_ip_mib.ipReasmReqds,
&cached_ip_mib.ipReasmOKs,
&cached_ip_mib.ipReasmFails,
&cached_ip_mib.ipFragOKs,
&cached_ip_mib.ipFragFails,
&cached_ip_mib.ipFragCreates);
cached_ip_mib.ipRoutingDiscards = 0; /* XXX */
} else if (!strncmp(line, ICMP_STATS_LINE, ICMP_STATS_PREFIX_LEN)) {
sscanf(line, ICMP_STATS_LINE,
&cached_icmp_mib.icmpInMsgs,
&cached_icmp_mib.icmpInErrors,
&cached_icmp_mib.icmpInDestUnreachs,
&cached_icmp_mib.icmpInTimeExcds,
&cached_icmp_mib.icmpInParmProbs,
&cached_icmp_mib.icmpInSrcQuenchs,
&cached_icmp_mib.icmpInRedirects,
&cached_icmp_mib.icmpInEchos,
&cached_icmp_mib.icmpInEchoReps,
&cached_icmp_mib.icmpInTimestamps,
&cached_icmp_mib.icmpInTimestampReps,
&cached_icmp_mib.icmpInAddrMasks,
&cached_icmp_mib.icmpInAddrMaskReps,
&cached_icmp_mib.icmpOutMsgs,
&cached_icmp_mib.icmpOutErrors,
&cached_icmp_mib.icmpOutDestUnreachs,
&cached_icmp_mib.icmpOutTimeExcds,
&cached_icmp_mib.icmpOutParmProbs,
&cached_icmp_mib.icmpOutSrcQuenchs,
&cached_icmp_mib.icmpOutRedirects,
&cached_icmp_mib.icmpOutEchos,
&cached_icmp_mib.icmpOutEchoReps,
&cached_icmp_mib.icmpOutTimestamps,
&cached_icmp_mib.icmpOutTimestampReps,
&cached_icmp_mib.icmpOutAddrMasks,
&cached_icmp_mib.icmpOutAddrMaskReps);
} else if (!strncmp(line, TCP_STATS_LINE, TCP_STATS_PREFIX_LEN)) {
int ret = sscanf(line, TCP_STATS_LINE,
&cached_tcp_mib.tcpRtoAlgorithm,
&cached_tcp_mib.tcpRtoMin,
&cached_tcp_mib.tcpRtoMax,
&cached_tcp_mib.tcpMaxConn,
&cached_tcp_mib.tcpActiveOpens,
&cached_tcp_mib.tcpPassiveOpens,
&cached_tcp_mib.tcpAttemptFails,
&cached_tcp_mib.tcpEstabResets,
&cached_tcp_mib.tcpCurrEstab,
&cached_tcp_mib.tcpInSegs,
&cached_tcp_mib.tcpOutSegs,
&cached_tcp_mib.tcpRetransSegs,
&cached_tcp_mib.tcpInErrs,
&cached_tcp_mib.tcpOutRsts);
cached_tcp_mib.tcpInErrsValid = (ret > 12) ? 1 : 0;
cached_tcp_mib.tcpOutRstsValid = (ret > 13) ? 1 : 0;
} else if (!strncmp(line, UDP_STATS_LINE, UDP_STATS_PREFIX_LEN)) {
sscanf(line, UDP_STATS_LINE,
&cached_udp_mib.udpInDatagrams,
&cached_udp_mib.udpNoPorts,
&cached_udp_mib.udpInErrors,
&cached_udp_mib.udpOutDatagrams);
}
}
fclose(in);
/*
* Tweak illegal values:
*
* valid values for ipForwarding are 1 == yup, 2 == nope
* a 0 is forbidden, so patch:
*/
if (!cached_ip_mib.ipForwarding)
cached_ip_mib.ipForwarding = 2;
/*
* 0 is illegal for tcpRtoAlgorithm
* so assume `other' algorithm:
*/
if (!cached_tcp_mib.tcpRtoAlgorithm)
cached_tcp_mib.tcpRtoAlgorithm = 1;
return 0;
}
int
linux_read_ip_stat(struct ip_mib *ipstat)
{
memset((char *) ipstat, (0), sizeof(*ipstat));
if (linux_read_mibII_stats() == -1)
return -1;
memcpy((char *) ipstat, (char *) &cached_ip_mib, sizeof(*ipstat));
return 0;
}
int
linux_read_icmp_stat(struct icmp_mib *icmpstat)
{
memset((char *) icmpstat, (0), sizeof(*icmpstat));
if (linux_read_mibII_stats() == -1)
return -1;
memcpy((char *) icmpstat, (char *) &cached_icmp_mib,
sizeof(*icmpstat));
return 0;
}
int
linux_read_tcp_stat(struct tcp_mib *tcpstat)
{
memset((char *) tcpstat, (0), sizeof(*tcpstat));
if (linux_read_mibII_stats() == -1)
return -1;
memcpy((char *) tcpstat, (char *) &cached_tcp_mib, sizeof(*tcpstat));
return 0;
}
int
linux_read_udp_stat(struct udp_mib *udpstat)
{
memset((char *) udpstat, (0), sizeof(*udpstat));
if (linux_read_mibII_stats() == -1)
return -1;
memcpy((char *) udpstat, (char *) &cached_udp_mib, sizeof(*udpstat));
return 0;
}
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