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#include <ctype.h>
#include <libgen.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#define PROC_NET_DEV "/proc/net/dev"
int if_err_(int argc, char **argv) {
char *interface;
FILE *f;
char buff[256], *s;
int i;
interface = basename(argv[0]);
if(strncmp(interface, "if_err_", 7) != 0) {
fputs("if_err_ invoked with invalid basename\n", stderr);
return 1;
}
interface += 7;
if(argc > 1) {
if(!strcmp(argv[1], "autoconf")) {
if(access(PROC_NET_DEV, R_OK) == 0) {
puts("yes");
return 0;
} else {
puts("no (/proc/net/dev not found)");
return 1;
}
}
if(!strcmp(argv[1], "suggest")) {
if(NULL == (f = fopen(PROC_NET_DEV, "r")))
return 1;
while(fgets(buff, 256, f)) {
for(s=buff;*s == ' ';++s)
;
i = 0;
if(!strncmp(s, "eth", 3))
i = 3;
else if(!strncmp(s, "wlan", 4))
i = 4;
else if(!strncmp(s, "ath", 3))
i = 3;
else if(!strncmp(s, "ra", 2))
i = 2;
if(i == 0)
continue;
while(isdigit(s[i]))
++i;
if(s[i] != ':')
continue;
s[i] = '\0';
puts(s);
}
fclose(f);
return 0;
}
if(!strcmp(argv[1], "config")) {
puts("graph_order rcvd trans");
printf("graph_title %s errors\n", interface);
puts("graph_args --base 1000\n"
"graph_vlabel packets in (-) / out (+) per "
"${graph_period}\n"
"graph_category network");
printf("graph_info This graph shows the amount of "
"errors on the %s network interface.\n",
interface);
puts("rcvd.label packets\n"
"rcvd.type COUNTER\n"
"rcvd.graph no\n"
"rcvd.warning 1\n"
"trans.label packets\n"
"trans.type COUNTER\n"
"trans.negative rcvd\n"
"trans.warning 1");
return 0;
}
}
if(NULL == (f = fopen(PROC_NET_DEV, "r")))
return 1;
while(fgets(buff, 256, f)) {
for(s=buff;*s == ' ';++s)
;
if(0 != strncmp(s, interface, strlen(interface)))
continue;
s += strlen(interface);
if(*s != ':')
continue;
++s;
while(*s == ' ')
++s;
for(i=1;i<3;++i) {
while(isdigit(*s))
++s;
while(isspace(*s))
++s;
}
for(i=0;isdigit(s[i]);++i)
;
printf("rcvd.value ");
fwrite(s, 1, i, stdout);
putchar('\n');
s += i;
while(isspace(*s))
++s;
for(i=4;i<11;++i) {
while(isdigit(*s))
++s;
while(isspace(*s))
++s;
}
for(i=0;isdigit(s[i]);++i)
;
printf("trans.value ");
fwrite(s, 1, i, stdout);
putchar('\n');
}
return 0;
}
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