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-rw-r--r--misc/rtacct.c622
1 files changed, 622 insertions, 0 deletions
diff --git a/misc/rtacct.c b/misc/rtacct.c
new file mode 100644
index 0000000..08363bf
--- /dev/null
+++ b/misc/rtacct.c
@@ -0,0 +1,622 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * rtacct.c Applet to display contents of /proc/net/rt_acct.
+ *
+ * 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 <sys/file.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/poll.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <signal.h>
+#include <math.h>
+
+#include "rt_names.h"
+
+#include "version.h"
+
+int reset_history;
+int ignore_history;
+int no_output;
+int no_update;
+int scan_interval;
+int time_constant;
+int dump_zeros;
+unsigned long magic_number;
+double W;
+
+static int generic_proc_open(const char *env, const char *name)
+{
+ char store[1024];
+ char *p = getenv(env);
+
+ if (!p) {
+ p = getenv("PROC_ROOT") ? : "/proc";
+ snprintf(store, sizeof(store)-1, "%s/%s", p, name);
+ p = store;
+ }
+ return open(p, O_RDONLY);
+}
+
+static int net_rtacct_open(void)
+{
+ return generic_proc_open("PROC_NET_RTACCT", "net/rt_acct");
+}
+
+static __u32 rmap[256/4];
+
+struct rtacct_data {
+ __u32 ival[256*4];
+
+ unsigned long long val[256*4];
+ double rate[256*4];
+ char signature[128];
+};
+
+static struct rtacct_data kern_db_static;
+
+static struct rtacct_data *kern_db = &kern_db_static;
+static struct rtacct_data *hist_db;
+
+static void nread(int fd, char *buf, int tot)
+{
+ int count = 0;
+
+ while (count < tot) {
+ int n = read(fd, buf+count, tot-count);
+
+ if (n < 0) {
+ if (errno == EINTR)
+ continue;
+ exit(-1);
+ }
+ if (n == 0)
+ exit(-1);
+ count += n;
+ }
+}
+
+static __u32 *read_kern_table(__u32 *tbl)
+{
+ static __u32 *tbl_ptr;
+ int fd;
+
+ if (magic_number) {
+ if (tbl_ptr != NULL)
+ return tbl_ptr;
+
+ fd = open("/dev/mem", O_RDONLY);
+ if (fd < 0) {
+ perror("magic open");
+ exit(-1);
+ }
+ tbl_ptr = mmap(NULL, 4096,
+ PROT_READ,
+ MAP_SHARED,
+ fd, magic_number);
+ if ((unsigned long)tbl_ptr == ~0UL) {
+ perror("magic mmap");
+ exit(-1);
+ }
+ close(fd);
+ return tbl_ptr;
+ }
+
+ fd = net_rtacct_open();
+ if (fd >= 0) {
+ nread(fd, (char *)tbl, 256*16);
+ close(fd);
+ } else {
+ memset(tbl, 0, 256*16);
+ }
+ return tbl;
+}
+
+static void format_rate(FILE *fp, double rate)
+{
+ char temp[64];
+
+ if (rate > 1024*1024) {
+ sprintf(temp, "%uM", (unsigned int)rint(rate/(1024*1024)));
+ fprintf(fp, " %-10s", temp);
+ } else if (rate > 1024) {
+ sprintf(temp, "%uK", (unsigned int)rint(rate/1024));
+ fprintf(fp, " %-10s", temp);
+ } else
+ fprintf(fp, " %-10u", (unsigned int)rate);
+}
+
+static void format_count(FILE *fp, unsigned long long val)
+{
+ if (val > 1024*1024*1024)
+ fprintf(fp, " %10lluM", val/(1024*1024));
+ else if (val > 1024*1024)
+ fprintf(fp, " %10lluK", val/1024);
+ else
+ fprintf(fp, " %10llu", val);
+}
+
+static void dump_abs_db(FILE *fp)
+{
+ int realm;
+ char b1[16];
+
+ if (!no_output) {
+ fprintf(fp, "#%s\n", kern_db->signature);
+ fprintf(fp,
+"%-10s %-10s "
+"%-10s %-10s "
+"%-10s \n"
+ , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
+ fprintf(fp,
+"%-10s %-10s "
+"%-10s %-10s "
+"%-10s \n"
+ , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
+
+ }
+
+ for (realm = 0; realm < 256; realm++) {
+ int i;
+ unsigned long long *val;
+ double *rate;
+
+ if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
+ continue;
+
+ val = &kern_db->val[realm*4];
+ rate = &kern_db->rate[realm*4];
+
+ if (!dump_zeros &&
+ !val[0] && !rate[0] &&
+ !val[1] && !rate[1] &&
+ !val[2] && !rate[2] &&
+ !val[3] && !rate[3])
+ continue;
+
+ if (hist_db) {
+ memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4);
+ }
+
+ if (no_output)
+ continue;
+
+ fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
+ for (i = 0; i < 4; i++)
+ format_count(fp, val[i]);
+ fprintf(fp, "\n%-10s", "");
+ for (i = 0; i < 4; i++)
+ format_rate(fp, rate[i]);
+ fprintf(fp, "\n");
+ }
+}
+
+
+static void dump_incr_db(FILE *fp)
+{
+ int k, realm;
+ char b1[16];
+
+ if (!no_output) {
+ fprintf(fp, "#%s\n", kern_db->signature);
+ fprintf(fp,
+"%-10s %-10s "
+"%-10s %-10s "
+"%-10s \n"
+ , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
+ fprintf(fp,
+"%-10s %-10s "
+"%-10s %-10s "
+"%-10s \n"
+ , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
+ }
+
+ for (realm = 0; realm < 256; realm++) {
+ int ovfl = 0;
+ int i;
+ unsigned long long *val;
+ double *rate;
+ unsigned long long rval[4];
+
+ if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
+ continue;
+
+ val = &kern_db->val[realm*4];
+ rate = &kern_db->rate[realm*4];
+
+ for (k = 0; k < 4; k++) {
+ rval[k] = val[k];
+ if (rval[k] < hist_db->val[realm*4+k])
+ ovfl = 1;
+ else
+ rval[k] -= hist_db->val[realm*4+k];
+ }
+ if (ovfl) {
+ for (k = 0; k < 4; k++)
+ rval[k] = val[k];
+ }
+ if (hist_db) {
+ memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4);
+ }
+
+ if (no_output)
+ continue;
+
+ if (!dump_zeros &&
+ !rval[0] && !rate[0] &&
+ !rval[1] && !rate[1] &&
+ !rval[2] && !rate[2] &&
+ !rval[3] && !rate[3])
+ continue;
+
+
+ fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
+ for (i = 0; i < 4; i++)
+ format_count(fp, rval[i]);
+ fprintf(fp, "\n%-10s", "");
+ for (i = 0; i < 4; i++)
+ format_rate(fp, rate[i]);
+ fprintf(fp, "\n");
+ }
+}
+
+
+static int children;
+
+static void sigchild(int signo)
+{
+}
+
+/* Server side only: read kernel data, update tables, calculate rates. */
+
+static void update_db(int interval)
+{
+ int i;
+ __u32 *ival;
+ __u32 _ival[256*4];
+
+ ival = read_kern_table(_ival);
+
+ for (i = 0; i < 256*4; i++) {
+ double sample;
+ __u32 incr = ival[i] - kern_db->ival[i];
+
+ if (ival[i] == 0 && incr == 0 &&
+ kern_db->val[i] == 0 && kern_db->rate[i] == 0)
+ continue;
+
+ kern_db->val[i] += incr;
+ kern_db->ival[i] = ival[i];
+ sample = (double)(incr*1000)/interval;
+ if (interval >= scan_interval) {
+ kern_db->rate[i] += W*(sample-kern_db->rate[i]);
+ } else if (interval >= 1000) {
+ if (interval >= time_constant) {
+ kern_db->rate[i] = sample;
+ } else {
+ double w = W*(double)interval/scan_interval;
+
+ kern_db->rate[i] += w*(sample-kern_db->rate[i]);
+ }
+ }
+ }
+}
+
+static void send_db(int fd)
+{
+ int tot = 0;
+
+ while (tot < sizeof(*kern_db)) {
+ int n = write(fd, ((char *)kern_db) + tot, sizeof(*kern_db)-tot);
+
+ if (n < 0) {
+ if (errno == EINTR)
+ continue;
+ return;
+ }
+ tot += n;
+ }
+}
+
+
+
+#define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
+
+
+static void pad_kern_table(struct rtacct_data *dat, __u32 *ival)
+{
+ int i;
+
+ memset(dat->rate, 0, sizeof(dat->rate));
+ if (dat->ival != ival)
+ memcpy(dat->ival, ival, sizeof(dat->ival));
+ for (i = 0; i < 256*4; i++)
+ dat->val[i] = ival[i];
+}
+
+static void server_loop(int fd)
+{
+ struct timeval snaptime = { 0 };
+ struct pollfd p;
+
+ p.fd = fd;
+ p.events = p.revents = POLLIN;
+
+ sprintf(kern_db->signature,
+ "%u.%lu sampling_interval=%d time_const=%d",
+ (unsigned int) getpid(), (unsigned long)random(),
+ scan_interval/1000, time_constant/1000);
+
+ pad_kern_table(kern_db, read_kern_table(kern_db->ival));
+
+ for (;;) {
+ int status;
+ int 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, tdiff + scan_interval) > 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 {
+ if (tdiff > 0)
+ update_db(tdiff);
+ send_db(clnt);
+ 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 usage(void) __attribute__((noreturn));
+
+static void usage(void)
+{
+ fprintf(stderr,
+"Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]\n"
+ );
+ exit(-1);
+}
+
+int main(int argc, char *argv[])
+{
+ char hist_name[128];
+ struct sockaddr_un sun;
+ int ch;
+ int fd;
+
+ while ((ch = getopt(argc, argv, "h?vVzrM:nasd:t:")) != 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 'd':
+ scan_interval = 1000*atoi(optarg);
+ break;
+ case 't':
+ if (sscanf(optarg, "%d", &time_constant) != 1 ||
+ time_constant <= 0) {
+ fprintf(stderr, "rtacct: invalid time constant divisor\n");
+ exit(-1);
+ }
+ break;
+ case 'v':
+ case 'V':
+ printf("rtacct utility, iproute2-%s\n", version);
+ exit(0);
+ case 'M':
+ /* Some secret undocumented option, nobody
+ * is expected to ask about its sense. See?
+ */
+ sscanf(optarg, "%lx", &magic_number);
+ break;
+ case 'h':
+ case '?':
+ default:
+ usage();
+ }
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ if (argc) {
+ while (argc > 0) {
+ __u32 realm;
+
+ if (rtnl_rtrealm_a2n(&realm, argv[0])) {
+ fprintf(stderr, "Warning: realm \"%s\" does not exist.\n", argv[0]);
+ exit(-1);
+ }
+ rmap[realm>>5] |= (1<<(realm&0x1f));
+ argc--; argv++;
+ }
+ } else {
+ memset(rmap, ~0, sizeof(rmap));
+ /* Always suppress zeros. */
+ dump_zeros = 0;
+ }
+
+ sun.sun_family = AF_UNIX;
+ sun.sun_path[0] = 0;
+ sprintf(sun.sun_path+1, "rtacct%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("rtacct: socket");
+ exit(-1);
+ }
+ if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
+ perror("rtacct: bind");
+ exit(-1);
+ }
+ if (listen(fd, 5) < 0) {
+ perror("rtacct: listen");
+ exit(-1);
+ }
+ if (daemon(0, 0)) {
+ perror("rtacct: daemon");
+ exit(-1);
+ }
+ signal(SIGPIPE, SIG_IGN);
+ signal(SIGCHLD, sigchild);
+ server_loop(fd);
+ exit(0);
+ }
+
+ if (getenv("RTACCT_HISTORY"))
+ snprintf(hist_name, sizeof(hist_name), "%s", getenv("RTACCT_HISTORY"));
+ else
+ sprintf(hist_name, "/tmp/.rtacct.u%d", 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("rtacct: open history file");
+ exit(-1);
+ }
+ if (flock(fd, LOCK_EX)) {
+ perror("rtacct: flock history file");
+ exit(-1);
+ }
+ if (fstat(fd, &stb) != 0) {
+ perror("rtacct: fstat history file");
+ exit(-1);
+ }
+ if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
+ fprintf(stderr, "rtacct: something is so wrong with history file, that I prefer not to proceed.\n");
+ exit(-1);
+ }
+ if (stb.st_size != sizeof(*hist_db))
+ if (write(fd, kern_db, sizeof(*hist_db)) < 0) {
+ perror("rtacct: write history file");
+ exit(-1);
+ }
+
+ hist_db = mmap(NULL, sizeof(*hist_db),
+ PROT_READ|PROT_WRITE,
+ no_update ? MAP_PRIVATE : MAP_SHARED,
+ fd, 0);
+
+ if ((unsigned long)hist_db == ~0UL) {
+ perror("mmap");
+ 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, "rtacct: history is aged out, resetting\n");
+ memset(hist_db, 0, sizeof(*hist_db));
+ }
+ }
+
+ close(fd);
+ }
+
+ 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, "rtacct0"),
+ connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
+ && verify_forging(fd) == 0) {
+ nread(fd, (char *)kern_db, sizeof(*kern_db));
+ if (hist_db && hist_db->signature[0] &&
+ strcmp(kern_db->signature, hist_db->signature)) {
+ fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
+ hist_db = NULL;
+ }
+ close(fd);
+ } else {
+ if (fd >= 0)
+ close(fd);
+
+ if (hist_db && hist_db->signature[0] &&
+ strcmp(hist_db->signature, "kernel")) {
+ fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
+ hist_db = NULL;
+ }
+
+ pad_kern_table(kern_db, read_kern_table(kern_db->ival));
+ strcpy(kern_db->signature, "kernel");
+ }
+
+ if (ignore_history || hist_db == NULL)
+ dump_abs_db(stdout);
+ else
+ dump_incr_db(stdout);
+
+ exit(0);
+}
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