| /* |
| * nstat.c handy utility to read counters /proc/net/netstat and snmp |
| * |
| * 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 <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; |
| double W; |
| char **patterns; |
| int npatterns; |
| |
| char info_source[128]; |
| int source_mismatch; |
| |
| static int generic_proc_open(const char *env, char *name) |
| { |
| char store[128]; |
| 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_netstat_open(void) |
| { |
| return generic_proc_open("PROC_NET_NETSTAT", "net/netstat"); |
| } |
| |
| static int net_snmp_open(void) |
| { |
| return generic_proc_open("PROC_NET_SNMP", "net/snmp"); |
| } |
| |
| static int net_snmp6_open(void) |
| { |
| return generic_proc_open("PROC_NET_SNMP6", "net/snmp6"); |
| } |
| |
| static int net_sctp_snmp_open(void) |
| { |
| return generic_proc_open("PROC_NET_SCTP_SNMP", "net/sctp/snmp"); |
| } |
| |
| struct nstat_ent { |
| struct nstat_ent *next; |
| char *id; |
| unsigned long long val; |
| double rate; |
| }; |
| |
| struct nstat_ent *kern_db; |
| struct nstat_ent *hist_db; |
| |
| static const char *useless_numbers[] = { |
| "IpForwarding", "IpDefaultTTL", |
| "TcpRtoAlgorithm", "TcpRtoMin", "TcpRtoMax", |
| "TcpMaxConn", "TcpCurrEstab" |
| }; |
| |
| static int useless_number(const char *id) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(useless_numbers); i++) |
| if (strcmp(id, useless_numbers[i]) == 0) |
| return 1; |
| return 0; |
| } |
| |
| 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 void load_good_table(FILE *fp) |
| { |
| char buf[4096]; |
| struct nstat_ent *db = NULL; |
| struct nstat_ent *n; |
| |
| while (fgets(buf, sizeof(buf), fp) != NULL) { |
| int nr; |
| unsigned long long val; |
| double rate; |
| char idbuf[sizeof(buf)]; |
| |
| if (buf[0] == '#') { |
| buf[strlen(buf)-1] = 0; |
| if (info_source[0] && strcmp(info_source, buf+1)) |
| source_mismatch = 1; |
| info_source[0] = 0; |
| strncat(info_source, buf+1, sizeof(info_source)-1); |
| continue; |
| } |
| /* idbuf is as big as buf, so this is safe */ |
| nr = sscanf(buf, "%s%llu%lg", idbuf, &val, &rate); |
| if (nr < 2) { |
| fprintf(stderr, "%s:%d: error parsing history file\n", |
| __FILE__, __LINE__); |
| exit(-2); |
| } |
| if (nr < 3) |
| rate = 0; |
| if (useless_number(idbuf)) |
| continue; |
| if ((n = malloc(sizeof(*n))) == NULL) { |
| perror("nstat: malloc"); |
| exit(-1); |
| } |
| n->id = strdup(idbuf); |
| n->val = val; |
| n->rate = rate; |
| n->next = db; |
| db = n; |
| } |
| |
| while (db) { |
| n = db; |
| db = db->next; |
| n->next = kern_db; |
| kern_db = n; |
| } |
| } |
| |
| static int count_spaces(const char *line) |
| { |
| int count = 0; |
| char c; |
| |
| while ((c = *line++) != 0) |
| count += c == ' ' || c == '\n'; |
| return count; |
| } |
| |
| static void load_ugly_table(FILE *fp) |
| { |
| char *buf = NULL; |
| size_t buflen = 0; |
| ssize_t nread; |
| struct nstat_ent *db = NULL; |
| struct nstat_ent *n; |
| |
| while ((nread = getline(&buf, &buflen, fp)) != -1) { |
| char idbuf[4096]; |
| int off; |
| char *p; |
| int count1, count2, skip = 0; |
| |
| p = strchr(buf, ':'); |
| if (!p) { |
| fprintf(stderr, "%s:%d: error parsing history file\n", |
| __FILE__, __LINE__); |
| exit(-2); |
| } |
| count1 = count_spaces(buf); |
| *p = 0; |
| idbuf[0] = 0; |
| strncat(idbuf, buf, sizeof(idbuf) - 1); |
| off = p - buf; |
| p += 2; |
| |
| while (*p) { |
| char *next; |
| |
| if ((next = strchr(p, ' ')) != NULL) |
| *next++ = 0; |
| else if ((next = strchr(p, '\n')) != NULL) |
| *next++ = 0; |
| if (off < sizeof(idbuf)) { |
| idbuf[off] = 0; |
| strncat(idbuf, p, sizeof(idbuf) - off - 1); |
| } |
| n = malloc(sizeof(*n)); |
| if (!n) { |
| perror("nstat: malloc"); |
| exit(-1); |
| } |
| n->id = strdup(idbuf); |
| n->rate = 0; |
| n->next = db; |
| db = n; |
| p = next; |
| } |
| n = db; |
| nread = getline(&buf, &buflen, fp); |
| if (nread == -1) { |
| fprintf(stderr, "%s:%d: error parsing history file\n", |
| __FILE__, __LINE__); |
| exit(-2); |
| } |
| count2 = count_spaces(buf); |
| if (count2 > count1) |
| skip = count2 - count1; |
| do { |
| p = strrchr(buf, ' '); |
| if (!p) { |
| fprintf(stderr, "%s:%d: error parsing history file\n", |
| __FILE__, __LINE__); |
| exit(-2); |
| } |
| *p = 0; |
| if (sscanf(p+1, "%llu", &n->val) != 1) { |
| fprintf(stderr, "%s:%d: error parsing history file\n", |
| __FILE__, __LINE__); |
| exit(-2); |
| } |
| /* Trick to skip "dummy" trailing ICMP MIB in 2.4 */ |
| if (skip) |
| skip--; |
| else |
| n = n->next; |
| } while (p > buf + off + 2); |
| } |
| free(buf); |
| |
| while (db) { |
| n = db; |
| db = db->next; |
| if (useless_number(n->id)) { |
| free(n->id); |
| free(n); |
| } else { |
| n->next = kern_db; |
| kern_db = n; |
| } |
| } |
| } |
| |
| static void load_sctp_snmp(void) |
| { |
| FILE *fp = fdopen(net_sctp_snmp_open(), "r"); |
| |
| if (fp) { |
| load_good_table(fp); |
| fclose(fp); |
| } |
| } |
| |
| static void load_snmp(void) |
| { |
| FILE *fp = fdopen(net_snmp_open(), "r"); |
| |
| if (fp) { |
| load_ugly_table(fp); |
| fclose(fp); |
| } |
| } |
| |
| static void load_snmp6(void) |
| { |
| FILE *fp = fdopen(net_snmp6_open(), "r"); |
| |
| if (fp) { |
| load_good_table(fp); |
| fclose(fp); |
| } |
| } |
| |
| static void load_netstat(void) |
| { |
| FILE *fp = fdopen(net_netstat_open(), "r"); |
| |
| if (fp) { |
| load_ugly_table(fp); |
| fclose(fp); |
| } |
| } |
| |
| |
| static void dump_kern_db(FILE *fp, int to_hist) |
| { |
| json_writer_t *jw = json_output ? jsonw_new(fp) : NULL; |
| struct nstat_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) { |
| unsigned long long val = n->val; |
| |
| if (!dump_zeros && !val && !n->rate) |
| continue; |
| if (!match(n->id)) { |
| struct nstat_ent *h1; |
| |
| if (!to_hist) |
| continue; |
| for (h1 = h; h1; h1 = h1->next) { |
| if (strcmp(h1->id, n->id) == 0) { |
| val = h1->val; |
| h = h1->next; |
| break; |
| } |
| } |
| } |
| |
| if (jw) |
| jsonw_uint_field(jw, n->id, val); |
| else |
| fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate); |
| } |
| |
| if (jw) { |
| jsonw_end_object(jw); |
| |
| jsonw_end_object(jw); |
| jsonw_destroy(&jw); |
| } |
| } |
| |
| static void dump_incr_db(FILE *fp) |
| { |
| json_writer_t *jw = json_output ? jsonw_new(fp) : NULL; |
| struct nstat_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 ovfl = 0; |
| unsigned long long val = n->val; |
| struct nstat_ent *h1; |
| |
| for (h1 = h; h1; h1 = h1->next) { |
| if (strcmp(h1->id, n->id) == 0) { |
| if (val < h1->val) { |
| ovfl = 1; |
| val = h1->val; |
| } |
| val -= h1->val; |
| h = h1->next; |
| break; |
| } |
| } |
| if (!dump_zeros && !val && !n->rate) |
| continue; |
| if (!match(n->id)) |
| continue; |
| |
| if (jw) |
| jsonw_uint_field(jw, n->id, val); |
| else |
| fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val, |
| n->rate, ovfl?" (overflow)":""); |
| } |
| |
| 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 nstat_ent *n, *h; |
| |
| n = kern_db; |
| kern_db = NULL; |
| |
| load_netstat(); |
| load_snmp6(); |
| load_snmp(); |
| load_sctp_snmp(); |
| |
| h = kern_db; |
| kern_db = n; |
| |
| for (n = kern_db; n; n = n->next) { |
| struct nstat_ent *h1; |
| |
| for (h1 = h; h1; h1 = h1->next) { |
| if (strcmp(h1->id, n->id) == 0) { |
| double sample; |
| unsigned long long incr = h1->val - n->val; |
| |
| n->val = h1->val; |
| sample = (double)incr * 1000.0 / interval; |
| if (interval >= scan_interval) { |
| n->rate += W*(sample-n->rate); |
| } else if (interval >= 1000) { |
| if (interval >= time_constant) { |
| n->rate = sample; |
| } else { |
| double w = W*(double)interval/scan_interval; |
| |
| n->rate += w*(sample-n->rate); |
| } |
| } |
| |
| while (h != h1) { |
| struct nstat_ent *tmp = h; |
| |
| h = h->next; |
| free(tmp->id); |
| free(tmp); |
| }; |
| h = h1->next; |
| free(h1->id); |
| 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_netstat(); |
| load_snmp6(); |
| load_snmp(); |
| load_sctp_snmp(); |
| |
| 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_kern_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 usage(void) __attribute__((noreturn)); |
| |
| static void usage(void) |
| { |
| fprintf(stderr, |
| "Usage: nstat [OPTION] [ PATTERN [ PATTERN ] ]\n" |
| " -h, --help this message\n" |
| " -a, --ignore ignore history\n" |
| " -d, --scan=SECS sample every statistics every SECS\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"); |
| exit(-1); |
| } |
| |
| static const struct option longopts[] = { |
| { "help", 0, 0, 'h' }, |
| { "ignore", 0, 0, 'a' }, |
| { "scan", 1, 0, 'd'}, |
| { "nooutput", 0, 0, 'n' }, |
| { "json", 0, 0, 'j' }, |
| { "reset", 0, 0, 'r' }, |
| { "noupdate", 0, 0, 's' }, |
| { "pretty", 0, 0, 'p' }, |
| { "interval", 1, 0, 't' }, |
| { "version", 0, 0, 'V' }, |
| { "zeros", 0, 0, 'z' }, |
| { 0 } |
| }; |
| |
| int main(int argc, char *argv[]) |
| { |
| char *hist_name; |
| struct sockaddr_un sun; |
| FILE *hist_fp = NULL; |
| int ch; |
| int fd; |
| |
| while ((ch = getopt_long(argc, argv, "h?vVzrnasd:t:jp", |
| 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 'd': |
| scan_interval = 1000*atoi(optarg); |
| break; |
| case 't': |
| if (sscanf(optarg, "%d", &time_constant) != 1 || |
| time_constant <= 0) { |
| fprintf(stderr, "nstat: invalid time constant divisor\n"); |
| exit(-1); |
| } |
| break; |
| case 'j': |
| json_output = 1; |
| break; |
| case 'p': |
| pretty = 1; |
| break; |
| case 'v': |
| case 'V': |
| printf("nstat utility, iproute2-ss%s\n", SNAPSHOT); |
| exit(0); |
| case 'h': |
| case '?': |
| default: |
| usage(); |
| } |
| } |
| |
| argc -= optind; |
| argv += optind; |
| |
| sun.sun_family = AF_UNIX; |
| sun.sun_path[0] = 0; |
| sprintf(sun.sun_path+1, "nstat%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("nstat: socket"); |
| exit(-1); |
| } |
| if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) { |
| perror("nstat: bind"); |
| exit(-1); |
| } |
| if (listen(fd, 5) < 0) { |
| perror("nstat: listen"); |
| exit(-1); |
| } |
| if (daemon(0, 0)) { |
| perror("nstat: daemon"); |
| exit(-1); |
| } |
| signal(SIGPIPE, SIG_IGN); |
| signal(SIGCHLD, sigchild); |
| server_loop(fd); |
| exit(0); |
| } |
| |
| patterns = argv; |
| npatterns = argc; |
| |
| if ((hist_name = getenv("NSTAT_HISTORY")) == NULL) { |
| hist_name = malloc(128); |
| sprintf(hist_name, "/tmp/.nstat.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("nstat: open history file"); |
| exit(-1); |
| } |
| if ((hist_fp = fdopen(fd, "r+")) == NULL) { |
| perror("nstat: fdopen history file"); |
| exit(-1); |
| } |
| if (flock(fileno(hist_fp), LOCK_EX)) { |
| perror("nstat: flock history file"); |
| exit(-1); |
| } |
| if (fstat(fileno(hist_fp), &stb) != 0) { |
| perror("nstat: fstat history file"); |
| exit(-1); |
| } |
| if (stb.st_nlink != 1 || stb.st_uid != getuid()) { |
| fprintf(stderr, "nstat: 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, "nstat: history is aged out, resetting\n"); |
| if (ftruncate(fileno(hist_fp), 0) < 0) |
| perror("nstat: ftruncate"); |
| } |
| } |
| |
| load_good_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, "nstat0"), |
| 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, "nstat: fdopen failed: %s\n", |
| strerror(errno)); |
| close(fd); |
| } else { |
| load_good_table(sfp); |
| if (hist_db && source_mismatch) { |
| fprintf(stderr, "nstat: 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, "nstat: history is stale, ignoring it.\n"); |
| hist_db = NULL; |
| info_source[0] = 0; |
| } |
| load_netstat(); |
| load_snmp6(); |
| load_snmp(); |
| load_sctp_snmp(); |
| if (info_source[0] == 0) |
| strcpy(info_source, "kernel"); |
| } |
| |
| if (!no_output) { |
| if (ignore_history || hist_db == NULL) |
| dump_kern_db(stdout, 0); |
| else |
| dump_incr_db(stdout); |
| } |
| if (!no_update) { |
| if (ftruncate(fileno(hist_fp), 0) < 0) |
| perror("nstat: ftruncate"); |
| rewind(hist_fp); |
| |
| json_output = 0; |
| dump_kern_db(hist_fp, 1); |
| fclose(hist_fp); |
| } |
| exit(0); |
| } |