/*
* ifstat.c handy utility to read net interface statistics
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#include <fnmatch.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/poll.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <signal.h>
#include <math.h>
#include <getopt.h>
#include <linux/if.h>
#include <linux/if_link.h>
#include "libnetlink.h"
#include "json_writer.h"
#include "SNAPSHOT.h"
#include "utils.h"
int dump_zeros;
int reset_history;
int ignore_history;
int no_output;
int json_output;
int no_update;
int scan_interval;
int time_constant;
int show_errors;
int pretty;
double W;
char **patterns;
int npatterns;
bool is_extended;
int filter_type;
int sub_type;
char info_source[128];
int source_mismatch;
#define MAXS (sizeof(struct rtnl_link_stats)/sizeof(__u32))
#define NO_SUB_TYPE 0xffff
struct ifstat_ent {
struct ifstat_ent *next;
char *name;
int ifindex;
__u64 val[MAXS];
double rate[MAXS];
__u32 ival[MAXS];
};
static const char *stats[MAXS] = {
"rx_packets",
"tx_packets",
"rx_bytes",
"tx_bytes",
"rx_errors",
"tx_errors",
"rx_dropped",
"tx_dropped",
"multicast",
"collisions",
"rx_length_errors",
"rx_over_errors",
"rx_crc_errors",
"rx_frame_errors",
"rx_fifo_errors",
"rx_missed_errors",
"tx_aborted_errors",
"tx_carrier_errors",
"tx_fifo_errors",
"tx_heartbeat_errors",
"tx_window_errors",
"rx_compressed",
"tx_compressed"
};
struct ifstat_ent *kern_db;
struct ifstat_ent *hist_db;
static int match(const char *id)
{
int i;
if (npatterns == 0)
return 1;
for (i = 0; i < npatterns; i++) {
if (!fnmatch(patterns[i], id, 0))
return 1;
}
return 0;
}
static int get_nlmsg_extended(const struct sockaddr_nl *who,
struct nlmsghdr *m, void *arg)
{
struct if_stats_msg *ifsm = NLMSG_DATA(m);
struct rtattr *tb[IFLA_STATS_MAX+1];
int len = m->nlmsg_len;
struct ifstat_ent *n;
if (m->nlmsg_type != RTM_NEWSTATS)
return 0;
len -= NLMSG_LENGTH(sizeof(*ifsm));
if (len < 0)
return -1;
parse_rtattr(tb, IFLA_STATS_MAX, IFLA_STATS_RTA(ifsm), len);
if (tb[filter_type] == NULL)
return 0;
n = malloc(sizeof(*n));
if (!n)
abort();
n->ifindex = ifsm->ifindex;
n->name = strdup(ll_index_to_name(ifsm->ifindex));
if (sub_type == NO_SUB_TYPE) {
memcpy(&n->val, RTA_DATA(tb[filter_type]), sizeof(n->val));
} else {
struct rtattr *attr;
attr = parse_rtattr_one_nested(sub_type, tb[filter_type]);
if (attr == NULL) {
free(n);
return 0;
}
memcpy(&n->val, RTA_DATA(attr), sizeof(n->val));
}
memset(&n->rate, 0, sizeof(n->rate));
n->next = kern_db;
kern_db = n;
return 0;
}
static int get_nlmsg(const struct sockaddr_nl *who,
struct nlmsghdr *m, void *arg)
{
struct ifinfomsg *ifi = NLMSG_DATA(m);
struct rtattr *tb[IFLA_MAX+1];
int len = m->nlmsg_len;
struct ifstat_ent *n;
int i;
if (m->nlmsg_type != RTM_NEWLINK)
return 0;
len -= NLMSG_LENGTH(sizeof(*ifi));
if (len < 0)
return -1;
if (!(ifi->ifi_flags&IFF_UP))
return 0;
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
if (tb[IFLA_IFNAME] == NULL || tb[IFLA_STATS] == NULL)
return 0;
n = malloc(sizeof(*n));
if (!n)
abort();
n->ifindex = ifi->ifi_index;
n->name = strdup(RTA_DATA(tb[IFLA_IFNAME]));
memcpy(&n->ival, RTA_DATA(tb[IFLA_STATS]), sizeof(n->ival));
memset(&n->rate, 0, sizeof(n->rate));
for (i = 0; i < MAXS; i++)
n->val[i] = n->ival[i];
n->next = kern_db;
kern_db = n;
return 0;
}
static void load_info(void)
{
struct ifstat_ent *db, *n;
struct rtnl_handle rth;
__u32 filter_mask;
if (rtnl_open(&rth, 0) < 0)
exit(1);
if (is_extended) {
ll_init_map(&rth);
filter_mask = IFLA_STATS_FILTER_BIT(filter_type);
if (rtnl_wilddump_stats_req_filter(&rth, AF_UNSPEC, RTM_GETSTATS,
filter_mask) < 0) {
perror("Cannot send dump request");
exit(1);
}
if (rtnl_dump_filter(&rth, get_nlmsg_extended, NULL) < 0) {
fprintf(stderr, "Dump terminated\n");
exit(1);
}
} else {
if (rtnl_wilddump_request(&rth, AF_INET, RTM_GETLINK) < 0) {
perror("Cannot send dump request");
exit(1);
}
if (rtnl_dump_filter(&rth, get_nlmsg, NULL) < 0) {
fprintf(stderr, "Dump terminated\n");
exit(1);
}
}
rtnl_close(&rth);
db = kern_db;
kern_db = NULL;
while (db) {
n = db;
db = db->next;
n->next = kern_db;
kern_db = n;
}
}
static void load_raw_table(FILE *fp)
{
char buf[4096];
struct ifstat_ent *db = NULL;
struct ifstat_ent *n;
while (fgets(buf, sizeof(buf), fp) != NULL) {
char *p;
char *next;
int i;
if (buf[0] == '#') {
buf[strlen(buf)-1] = 0;
if (info_source[0] && strcmp(info_source, buf+1))
source_mismatch = 1;
strncpy(info_source, buf+1, sizeof(info_source)-1);
continue;
}
if ((n = malloc(sizeof(*n))) == NULL)
abort();
if (!(p = strchr(buf, ' ')))
abort();
*p++ = 0;
if (sscanf(buf, "%d", &n->ifindex) != 1)
abort();
if (!(next = strchr(p, ' ')))
abort();
*next++ = 0;
n->name = strdup(p);
p = next;
for (i = 0; i < MAXS; i++) {
unsigned int rate;
if (!(next = strchr(p, ' ')))
abort();
*next++ = 0;
if (sscanf(p, "%llu", n->val+i) != 1)
abort();
n->ival[i] = (__u32)n->val[i];
p = next;
if (!(next = strchr(p, ' ')))
abort();
*next++ = 0;
if (sscanf(p, "%u", &rate) != 1)
abort();
n->rate[i] = rate;
p = next;
}
n->next = db;
db = n;
}
while (db) {
n = db;
db = db->next;
n->next = kern_db;
kern_db = n;
}
}
static void dump_raw_db(FILE *fp, int to_hist)
{
json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
struct ifstat_ent *n, *h;
h = hist_db;
if (jw) {
jsonw_start_object(jw);
jsonw_pretty(jw, pretty);
jsonw_name(jw, info_source);
jsonw_start_object(jw);
} else
fprintf(fp, "#%s\n", info_source);
for (n = kern_db; n; n = n->next) {
int i;
unsigned long long *vals = n->val;
double *rates = n->rate;
if (!match(n->name)) {
struct ifstat_ent *h1;
if (!to_hist)
continue;
for (h1 = h; h1; h1 = h1->next) {
if (h1->ifindex == n->ifindex) {
vals = h1->val;
rates = h1->rate;
h = h1->next;
break;
}
}
}
if (jw) {
jsonw_name(jw, n->name);
jsonw_start_object(jw);
for (i = 0; i < MAXS && stats[i]; i++)
jsonw_uint_field(jw, stats[i], vals[i]);
jsonw_end_object(jw);
} else {
fprintf(fp, "%d %s ", n->ifindex, n->name);
for (i = 0; i < MAXS; i++)
fprintf(fp, "%llu %u ", vals[i],
(unsigned int)rates[i]);
fprintf(fp, "\n");
}
}
if (jw) {
jsonw_end_object(jw);
jsonw_end_object(jw);
jsonw_destroy(&jw);
}
}
/* use communication definitions of meg/kilo etc */
static const unsigned long long giga = 1000000000ull;
static const unsigned long long mega = 1000000;
static const unsigned long long kilo = 1000;
static void format_rate(FILE *fp, const unsigned long long *vals,
const double *rates, int i)
{
char temp[64];
if (vals[i] > giga)
fprintf(fp, "%7lluM ", vals[i]/mega);
else if (vals[i] > mega)
fprintf(fp, "%7lluK ", vals[i]/kilo);
else
fprintf(fp, "%8llu ", vals[i]);
if (rates[i] > mega) {
sprintf(temp, "%uM", (unsigned int)(rates[i]/mega));
fprintf(fp, "%-6s ", temp);
} else if (rates[i] > kilo) {
sprintf(temp, "%uK", (unsigned int)(rates[i]/kilo));
fprintf(fp, "%-6s ", temp);
} else
fprintf(fp, "%-6u ", (unsigned int)rates[i]);
}
static void format_pair(FILE *fp, const unsigned long long *vals, int i, int k)
{
char temp[64];
if (vals[i] > giga)
fprintf(fp, "%7lluM ", vals[i]/mega);
else if (vals[i] > mega)
fprintf(fp, "%7lluK ", vals[i]/kilo);
else
fprintf(fp, "%8llu ", vals[i]);
if (vals[k] > giga) {
sprintf(temp, "%uM", (unsigned int)(vals[k]/mega));
fprintf(fp, "%-6s ", temp);
} else if (vals[k] > mega) {
sprintf(temp, "%uK", (unsigned int)(vals[k]/kilo));
fprintf(fp, "%-6s ", temp);
} else
fprintf(fp, "%-6u ", (unsigned int)vals[k]);
}
static void print_head(FILE *fp)
{
fprintf(fp, "#%s\n", info_source);
fprintf(fp, "%-15s ", "Interface");
fprintf(fp, "%8s/%-6s ", "RX Pkts", "Rate");
fprintf(fp, "%8s/%-6s ", "TX Pkts", "Rate");
fprintf(fp, "%8s/%-6s ", "RX Data", "Rate");
fprintf(fp, "%8s/%-6s\n", "TX Data", "Rate");
if (!show_errors) {
fprintf(fp, "%-15s ", "");
fprintf(fp, "%8s/%-6s ", "RX Errs", "Drop");
fprintf(fp, "%8s/%-6s ", "TX Errs", "Drop");
fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
fprintf(fp, "%8s/%-6s\n", "TX Coll", "Rate");
} else {
fprintf(fp, "%-15s ", "");
fprintf(fp, "%8s/%-6s ", "RX Errs", "Rate");
fprintf(fp, "%8s/%-6s ", "RX Drop", "Rate");
fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
fprintf(fp, "%8s/%-6s\n", "RX Leng", "Rate");
fprintf(fp, "%-15s ", "");
fprintf(fp, "%8s/%-6s ", "RX Crc", "Rate");
fprintf(fp, "%8s/%-6s ", "RX Frm", "Rate");
fprintf(fp, "%8s/%-6s ", "RX Fifo", "Rate");
fprintf(fp, "%8s/%-6s\n", "RX Miss", "Rate");
fprintf(fp, "%-15s ", "");
fprintf(fp, "%8s/%-6s ", "TX Errs", "Rate");
fprintf(fp, "%8s/%-6s ", "TX Drop", "Rate");
fprintf(fp, "%8s/%-6s ", "TX Coll", "Rate");
fprintf(fp, "%8s/%-6s\n", "TX Carr", "Rate");
fprintf(fp, "%-15s ", "");
fprintf(fp, "%8s/%-6s ", "TX Abrt", "Rate");
fprintf(fp, "%8s/%-6s ", "TX Fifo", "Rate");
fprintf(fp, "%8s/%-6s ", "TX Hear", "Rate");
fprintf(fp, "%8s/%-6s\n", "TX Wind", "Rate");
}
}
static void print_one_json(json_writer_t *jw, const struct ifstat_ent *n,
const unsigned long long *vals)
{
int i, m = show_errors ? 20 : 10;
jsonw_name(jw, n->name);
jsonw_start_object(jw);
for (i = 0; i < m && stats[i]; i++)
jsonw_uint_field(jw, stats[i], vals[i]);
jsonw_end_object(jw);
}
static void print_one_if(FILE *fp, const struct ifstat_ent *n,
const unsigned long long *vals)
{
int i;
fprintf(fp, "%-15s ", n->name);
for (i = 0; i < 4; i++)
format_rate(fp, vals, n->rate, i);
fprintf(fp, "\n");
if (!show_errors) {
fprintf(fp, "%-15s ", "");
format_pair(fp, vals, 4, 6);
format_pair(fp, vals, 5, 7);
format_rate(fp, vals, n->rate, 11);
format_rate(fp, vals, n->rate, 9);
fprintf(fp, "\n");
} else {
fprintf(fp, "%-15s ", "");
format_rate(fp, vals, n->rate, 4);
format_rate(fp, vals, n->rate, 6);
format_rate(fp, vals, n->rate, 11);
format_rate(fp, vals, n->rate, 10);
fprintf(fp, "\n");
fprintf(fp, "%-15s ", "");
format_rate(fp, vals, n->rate, 12);
format_rate(fp, vals, n->rate, 13);
format_rate(fp, vals, n->rate, 14);
format_rate(fp, vals, n->rate, 15);
fprintf(fp, "\n");
fprintf(fp, "%-15s ", "");
format_rate(fp, vals, n->rate, 5);
format_rate(fp, vals, n->rate, 7);
format_rate(fp, vals, n->rate, 9);
format_rate(fp, vals, n->rate, 17);
fprintf(fp, "\n");
fprintf(fp, "%-15s ", "");
format_rate(fp, vals, n->rate, 16);
format_rate(fp, vals, n->rate, 18);
format_rate(fp, vals, n->rate, 19);
format_rate(fp, vals, n->rate, 20);
fprintf(fp, "\n");
}
}
static void dump_kern_db(FILE *fp)
{
json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
struct ifstat_ent *n;
if (jw) {
jsonw_start_object(jw);
jsonw_pretty(jw, pretty);
jsonw_name(jw, info_source);
jsonw_start_object(jw);
} else
print_head(fp);
for (n = kern_db; n; n = n->next) {
if (!match(n->name))
continue;
if (jw)
print_one_json(jw, n, n->val);
else
print_one_if(fp, n, n->val);
}
if (jw) {
jsonw_end_object(jw);
jsonw_end_object(jw);
jsonw_destroy(&jw);
}
}
static void dump_incr_db(FILE *fp)
{
struct ifstat_ent *n, *h;
json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
h = hist_db;
if (jw) {
jsonw_start_object(jw);
jsonw_pretty(jw, pretty);
jsonw_name(jw, info_source);
jsonw_start_object(jw);
} else
print_head(fp);
for (n = kern_db; n; n = n->next) {
int i;
unsigned long long vals[MAXS];
struct ifstat_ent *h1;
memcpy(vals, n->val, sizeof(vals));
for (h1 = h; h1; h1 = h1->next) {
if (h1->ifindex == n->ifindex) {
for (i = 0; i < MAXS; i++)
vals[i] -= h1->val[i];
h = h1->next;
break;
}
}
if (!match(n->name))
continue;
if (jw)
print_one_json(jw, n, n->val);
else
print_one_if(fp, n, vals);
}
if (jw) {
jsonw_end_object(jw);
jsonw_end_object(jw);
jsonw_destroy(&jw);
}
}
static int children;
static void sigchild(int signo)
{
}
static void update_db(int interval)
{
struct ifstat_ent *n, *h;
n = kern_db;
kern_db = NULL;
load_info();
h = kern_db;
kern_db = n;
for (n = kern_db; n; n = n->next) {
struct ifstat_ent *h1;
for (h1 = h; h1; h1 = h1->next) {
if (h1->ifindex == n->ifindex) {
int i;
for (i = 0; i < MAXS; i++) {
if ((long)(h1->ival[i] - n->ival[i]) < 0) {
memset(n->ival, 0, sizeof(n->ival));
break;
}
}
for (i = 0; i < MAXS; i++) {
double sample;
__u64 incr;
if (is_extended) {
incr = h1->val[i] - n->val[i];
n->val[i] = h1->val[i];
} else {
incr = (__u32) (h1->ival[i] - n->ival[i]);
n->val[i] += incr;
n->ival[i] = h1->ival[i];
}
sample = (double)(incr*1000)/interval;
if (interval >= scan_interval) {
n->rate[i] += W*(sample-n->rate[i]);
} else if (interval >= 1000) {
if (interval >= time_constant) {
n->rate[i] = sample;
} else {
double w = W*(double)interval/scan_interval;
n->rate[i] += w*(sample-n->rate[i]);
}
}
}
while (h != h1) {
struct ifstat_ent *tmp = h;
h = h->next;
free(tmp->name);
free(tmp);
};
h = h1->next;
free(h1->name);
free(h1);
break;
}
}
}
}
#define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
static void server_loop(int fd)
{
struct timeval snaptime = { 0 };
struct pollfd p;
p.fd = fd;
p.events = p.revents = POLLIN;
sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d",
getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000);
load_info();
for (;;) {
int status;
time_t tdiff;
struct timeval now;
gettimeofday(&now, NULL);
tdiff = T_DIFF(now, snaptime);
if (tdiff >= scan_interval) {
update_db(tdiff);
snaptime = now;
tdiff = 0;
}
if (poll(&p, 1, scan_interval - tdiff) > 0
&& (p.revents&POLLIN)) {
int clnt = accept(fd, NULL, NULL);
if (clnt >= 0) {
pid_t pid;
if (children >= 5) {
close(clnt);
} else if ((pid = fork()) != 0) {
if (pid > 0)
children++;
close(clnt);
} else {
FILE *fp = fdopen(clnt, "w");
if (fp)
dump_raw_db(fp, 0);
exit(0);
}
}
}
while (children && waitpid(-1, &status, WNOHANG) > 0)
children--;
}
}
static int verify_forging(int fd)
{
struct ucred cred;
socklen_t olen = sizeof(cred);
if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) ||
olen < sizeof(cred))
return -1;
if (cred.uid == getuid() || cred.uid == 0)
return 0;
return -1;
}
static void xstat_usage(void)
{
fprintf(stderr,
"Usage: ifstat supported xstats:\n"
" cpu_hits Counts only packets that went via the CPU.\n");
}
struct extended_stats_options_t {
char *name;
int id;
int sub_type;
};
/* Note: if one xstat name is subset of another, it should be before it in this
* list.
* Name length must be under 64 chars.
*/
static const struct extended_stats_options_t extended_stats_options[] = {
{"cpu_hits", IFLA_STATS_LINK_OFFLOAD_XSTATS, IFLA_OFFLOAD_XSTATS_CPU_HIT},
};
static const char *get_filter_type(const char *name)
{
int name_len;
int i;
name_len = strlen(name);
for (i = 0; i < ARRAY_SIZE(extended_stats_options); i++) {
const struct extended_stats_options_t *xstat;
xstat = &extended_stats_options[i];
if (strncmp(name, xstat->name, name_len) == 0) {
filter_type = xstat->id;
sub_type = xstat->sub_type;
return xstat->name;
}
}
fprintf(stderr, "invalid ifstat extension %s\n", name);
xstat_usage();
return NULL;
}
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr,
"Usage: ifstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
" -h, --help this message\n"
" -a, --ignore ignore history\n"
" -d, --scan=SECS sample every statistics every SECS\n"
" -e, --errors show errors\n"
" -j, --json format output in JSON\n"
" -n, --nooutput do history only\n"
" -p, --pretty pretty print\n"
" -r, --reset reset history\n"
" -s, --noupdate don't update history\n"
" -t, --interval=SECS report average over the last SECS\n"
" -V, --version output version information\n"
" -z, --zeros show entries with zero activity\n"
" -x, --extended=TYPE show extended stats of TYPE\n");
exit(-1);
}
static const struct option longopts[] = {
{ "help", 0, 0, 'h' },
{ "ignore", 0, 0, 'a' },
{ "scan", 1, 0, 'd'},
{ "errors", 0, 0, 'e' },
{ "nooutput", 0, 0, 'n' },
{ "json", 0, 0, 'j' },
{ "reset", 0, 0, 'r' },
{ "pretty", 0, 0, 'p' },
{ "noupdate", 0, 0, 's' },
{ "interval", 1, 0, 't' },
{ "version", 0, 0, 'V' },
{ "zeros", 0, 0, 'z' },
{ "extended", 1, 0, 'x'},
{ 0 }
};
int main(int argc, char *argv[])
{
char hist_name[128];
struct sockaddr_un sun;
FILE *hist_fp = NULL;
const char *stats_type = NULL;
int ch;
int fd;
is_extended = false;
while ((ch = getopt_long(argc, argv, "hjpvVzrnasd:t:ex:",
longopts, NULL)) != EOF) {
switch (ch) {
case 'z':
dump_zeros = 1;
break;
case 'r':
reset_history = 1;
break;
case 'a':
ignore_history = 1;
break;
case 's':
no_update = 1;
break;
case 'n':
no_output = 1;
break;
case 'e':
show_errors = 1;
break;
case 'j':
json_output = 1;
break;
case 'p':
pretty = 1;
break;
case 'd':
scan_interval = atoi(optarg) * 1000;
if (scan_interval <= 0) {
fprintf(stderr, "ifstat: invalid scan interval\n");
exit(-1);
}
break;
case 't':
time_constant = atoi(optarg);
if (time_constant <= 0) {
fprintf(stderr, "ifstat: invalid time constant divisor\n");
exit(-1);
}
break;
case 'x':
stats_type = optarg;
is_extended = true;
break;
case 'v':
case 'V':
printf("ifstat utility, iproute2-ss%s\n", SNAPSHOT);
exit(0);
case 'h':
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
if (stats_type) {
stats_type = get_filter_type(stats_type);
if (!stats_type)
exit(-1);
}
sun.sun_family = AF_UNIX;
sun.sun_path[0] = 0;
sprintf(sun.sun_path+1, "ifstat%d", getuid());
if (scan_interval > 0) {
if (time_constant == 0)
time_constant = 60;
time_constant *= 1000;
W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
perror("ifstat: socket");
exit(-1);
}
if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
perror("ifstat: bind");
exit(-1);
}
if (listen(fd, 5) < 0) {
perror("ifstat: listen");
exit(-1);
}
if (daemon(0, 0)) {
perror("ifstat: daemon");
exit(-1);
}
signal(SIGPIPE, SIG_IGN);
signal(SIGCHLD, sigchild);
server_loop(fd);
exit(0);
}
patterns = argv;
npatterns = argc;
if (getenv("IFSTAT_HISTORY"))
snprintf(hist_name, sizeof(hist_name),
"%s", getenv("IFSTAT_HISTORY"));
else
if (!stats_type)
snprintf(hist_name, sizeof(hist_name),
"%s/.ifstat.u%d", P_tmpdir, getuid());
else
snprintf(hist_name, sizeof(hist_name),
"%s/.%s_ifstat.u%d", P_tmpdir, stats_type,
getuid());
if (reset_history)
unlink(hist_name);
if (!ignore_history || !no_update) {
struct stat stb;
fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600);
if (fd < 0) {
perror("ifstat: open history file");
exit(-1);
}
if ((hist_fp = fdopen(fd, "r+")) == NULL) {
perror("ifstat: fdopen history file");
exit(-1);
}
if (flock(fileno(hist_fp), LOCK_EX)) {
perror("ifstat: flock history file");
exit(-1);
}
if (fstat(fileno(hist_fp), &stb) != 0) {
perror("ifstat: fstat history file");
exit(-1);
}
if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
fprintf(stderr, "ifstat: something is so wrong with history file, that I prefer not to proceed.\n");
exit(-1);
}
if (!ignore_history) {
FILE *tfp;
long uptime = -1;
if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
if (fscanf(tfp, "%ld", &uptime) != 1)
uptime = -1;
fclose(tfp);
}
if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
fprintf(stderr, "ifstat: history is aged out, resetting\n");
if (ftruncate(fileno(hist_fp), 0))
perror("ifstat: ftruncate");
}
}
load_raw_table(hist_fp);
hist_db = kern_db;
kern_db = NULL;
}
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
(connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0
|| (strcpy(sun.sun_path+1, "ifstat0"),
connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
&& verify_forging(fd) == 0) {
FILE *sfp = fdopen(fd, "r");
if (!sfp) {
fprintf(stderr, "ifstat: fdopen failed: %s\n",
strerror(errno));
close(fd);
} else {
load_raw_table(sfp);
if (hist_db && source_mismatch) {
fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
hist_db = NULL;
}
fclose(sfp);
}
} else {
if (fd >= 0)
close(fd);
if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
hist_db = NULL;
info_source[0] = 0;
}
load_info();
if (info_source[0] == 0)
strcpy(info_source, "kernel");
}
if (!no_output) {
if (ignore_history || hist_db == NULL)
dump_kern_db(stdout);
else
dump_incr_db(stdout);
}
if (!no_update) {
if (ftruncate(fileno(hist_fp), 0))
perror("ifstat: ftruncate");
rewind(hist_fp);
json_output = 0;
dump_raw_db(hist_fp, 1);
fclose(hist_fp);
}
exit(0);
}