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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 14:18:53 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 14:18:53 +0000 |
commit | a0e0018c9a7ef5ce7f6d2c3ae16aecbbd16a8f67 (patch) | |
tree | 8feaf1a1932871b139b3b30be4c09c66489918be /misc/rtacct.c | |
parent | Initial commit. (diff) | |
download | iproute2-upstream/6.1.0.tar.xz iproute2-upstream/6.1.0.zip |
Adding upstream version 6.1.0.upstream/6.1.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | misc/rtacct.c | 627 |
1 files changed, 627 insertions, 0 deletions
diff --git a/misc/rtacct.c b/misc/rtacct.c new file mode 100644 index 0000000..47b27e3 --- /dev/null +++ b/misc/rtacct.c @@ -0,0 +1,627 @@ +/* + * 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 <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); +} |