| /* |
| * rtacct.c Applet to display contents of /proc/net/rt_acct. |
| * |
| * 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 <sys/mman.h> |
| #include <signal.h> |
| #include <math.h> |
| |
| #include "rt_names.h" |
| |
| #include <SNAPSHOT.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-ss%s\n", SNAPSHOT); |
| 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); |
| } |