X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fdns.c;h=d82cbd86cc19809f7ff4180868534911a9049dc7;hb=bc7992ed0693313a2b1fe282a5bf23f1cc9f8e42;hp=b97ce2870d58569a839b489e250cbb9201227f75;hpb=d8057e8ffaad5518af96d82e0cbd8da44fb425ea;p=collectd.git diff --git a/src/dns.c b/src/dns.c index b97ce287..d82cbd86 100644 --- a/src/dns.c +++ b/src/dns.c @@ -1,11 +1,10 @@ /** * collectd - src/dns.c - * Copyright (C) 2006 Florian octo Forster + * Copyright (C) 2006,2007 Florian octo Forster * * 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. + * Free Software Foundation; only version 2 of the License is applicable. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of @@ -24,27 +23,15 @@ #include "common.h" #include "plugin.h" #include "configfile.h" -#include "utils_debug.h" -#if HAVE_SYS_POLL_H -# include -#endif - -#define MODULE_NAME "dns" - -#if HAVE_LIBPCAP -# define NAMED_HAVE_CONFIG 1 -#else -# define NAMED_HAVE_CONFIG 0 -#endif - -#if HAVE_LIBPCAP -# include "utils_dns.h" -# define NAMED_HAVE_READ 1 -#else -# define NAMED_HAVE_READ 0 -#endif +#include "utils_dns.h" +#include +#include +#include +/* + * Private data types + */ struct counter_list_s { unsigned int key; @@ -53,77 +40,49 @@ struct counter_list_s }; typedef struct counter_list_s counter_list_t; -static char *traffic_file = "dns/dns_traffic.rrd"; -static char *qtype_file = "dns/qtype-%s.rrd"; -static char *opcode_file = "dns/opcode-%s.rrd"; -static char *rcode_file = "dns/rcode-%s.rrd"; - -static char *traffic_ds_def[] = -{ - /* Limit to 1GBit/s */ - "DS:queries:COUNTER:"COLLECTD_HEARTBEAT":0:125000000", - "DS:responses:COUNTER:"COLLECTD_HEARTBEAT":0:125000000", - NULL -}; -static int traffic_ds_num = 2; - -static char *qtype_ds_def[] = -{ - "DS:value:COUNTER:"COLLECTD_HEARTBEAT":0:65535", - NULL -}; -static int qtype_ds_num = 1; - -static char *opcode_ds_def[] = -{ - "DS:value:COUNTER:"COLLECTD_HEARTBEAT":0:65535", - NULL -}; -static int opcode_ds_num = 1; - -static char *rcode_ds_def[] = -{ - "DS:value:COUNTER:"COLLECTD_HEARTBEAT":0:65535", - NULL -}; -static int rcode_ds_num = 1; - -#if NAMED_HAVE_CONFIG -#if HAVE_LIBPCAP -static char *config_keys[] = +/* + * Private variables + */ +static const char *config_keys[] = { "Interface", "IgnoreSource", NULL }; static int config_keys_num = 2; -#endif /* HAVE_LIBPCAP */ -#endif /* NAMED_HAVE_CONFIG */ -#if HAVE_LIBPCAP #define PCAP_SNAPLEN 1460 static char *pcap_device = NULL; -static int pipe_fd = -1; -static unsigned int tr_queries; -static unsigned int tr_responses; +static counter_t tr_queries; +static counter_t tr_responses; static counter_list_t *qtype_list; static counter_list_t *opcode_list; static counter_list_t *rcode_list; -#endif +static pthread_t listen_thread; +static int listen_thread_init = 0; +/* The `traffic' mutex if for `tr_queries' and `tr_responses' */ +static pthread_mutex_t traffic_mutex = PTHREAD_MUTEX_INITIALIZER; +static pthread_mutex_t qtype_mutex = PTHREAD_MUTEX_INITIALIZER; +static pthread_mutex_t opcode_mutex = PTHREAD_MUTEX_INITIALIZER; +static pthread_mutex_t rcode_mutex = PTHREAD_MUTEX_INITIALIZER; + +/* + * Private functions + */ static counter_list_t *counter_list_search (counter_list_t **list, unsigned int key) { counter_list_t *entry; - DBG ("counter_list_search (list = %p, key = %u)", + DEBUG ("counter_list_search (list = %p, key = %u)", (void *) *list, key); for (entry = *list; entry != NULL; entry = entry->next) if (entry->key == key) break; - DBG ("return (%p)", (void *) entry); + DEBUG ("return (%p)", (void *) entry); return (entry); } @@ -132,7 +91,7 @@ static counter_list_t *counter_list_create (counter_list_t **list, { counter_list_t *entry; - DBG ("counter_list_create (list = %p, key = %u, value = %u)", + DEBUG ("counter_list_create (list = %p, key = %u, value = %u)", (void *) *list, key, value); entry = (counter_list_t *) malloc (sizeof (counter_list_t)); @@ -158,7 +117,7 @@ static counter_list_t *counter_list_create (counter_list_t **list, last->next = entry; } - DBG ("return (%p)", (void *) entry); + DEBUG ("return (%p)", (void *) entry); return (entry); } @@ -167,7 +126,7 @@ static void counter_list_add (counter_list_t **list, { counter_list_t *entry; - DBG ("counter_list_add (list = %p, key = %u, increment = %u)", + DEBUG ("counter_list_add (list = %p, key = %u, increment = %u)", (void *) *list, key, increment); entry = counter_list_search (list, key); @@ -180,57 +139,11 @@ static void counter_list_add (counter_list_t **list, { counter_list_create (list, key, increment); } - DBG ("return ()"); + DEBUG ("return ()"); } -static int counter_list_send (counter_list_t *list, int fd) -{ - counter_list_t *cl; - unsigned int values[2 * T_MAX]; - unsigned int values_num; - - if (fd < 0) - return (-1); - - values_num = 0; - - for (cl = list; - (cl != NULL) && (values_num < T_MAX); - cl = cl->next) - { - values[2 * values_num] = cl->key; - values[(2 * values_num) + 1] = cl->value; - values_num++; - } - - DBG ("swrite (fd = %i, values_num = %i)", fd, values_num); - if (swrite (fd, (const void *) &values_num, sizeof (values_num)) != 0) - { - DBG ("Writing to fd failed: %s", strerror (errno)); - syslog (LOG_ERR, "dns plugin: Writing to fd failed: %s", - strerror (errno)); - return (-1); - } - - if (values_num == 0) - return (0); - - DBG ("swrite (fd = %i, values = %p, size = %i)", - fd, (void *) values, (int) (sizeof (int) * values_num)); - if (swrite (fd, (const void *) values, 2 * sizeof (int) * values_num) != 0) - { - DBG ("Writing to pipe failed: %s", strerror (errno)); - syslog (LOG_ERR, "dns plugin: Writing to pipe failed: %s", - strerror (errno)); - return (-1); - } - - return (values_num); -} -#if NAMED_HAVE_CONFIG -static int dns_config (char *key, char *value) +static int dns_config (const char *key, const char *value) { -#if HAVE_LIBPCAP if (strcasecmp (key, "Interface") == 0) { if (pcap_device != NULL) @@ -249,429 +162,238 @@ static int dns_config (char *key, char *value) } return (0); -#endif /* HAVE_LIBPCAP */ } -#endif /* NAMED_HAVE_CONFIG */ static void dns_child_callback (const rfc1035_header_t *dns) { if (dns->qr == 0) { /* This is a query */ + pthread_mutex_lock (&traffic_mutex); tr_queries += dns->length; + pthread_mutex_unlock (&traffic_mutex); + + pthread_mutex_lock (&qtype_mutex); counter_list_add (&qtype_list, dns->qtype, 1); + pthread_mutex_unlock (&qtype_mutex); } else { /* This is a reply */ + pthread_mutex_lock (&traffic_mutex); tr_responses += dns->length; + pthread_mutex_unlock (&traffic_mutex); + + pthread_mutex_lock (&rcode_mutex); counter_list_add (&rcode_list, dns->rcode, 1); + pthread_mutex_unlock (&rcode_mutex); } /* FIXME: Are queries, replies or both interesting? */ + pthread_mutex_lock (&opcode_mutex); counter_list_add (&opcode_list, dns->opcode, 1); + pthread_mutex_unlock (&opcode_mutex); } -static void dns_child_loop (void) +static void *dns_child_loop (void *dummy) { pcap_t *pcap_obj; char pcap_error[PCAP_ERRBUF_SIZE]; struct bpf_program fp; - struct pollfd poll_fds[2]; int status; - /* Don't catch these signals */ - signal (SIGINT, SIG_DFL); - signal (SIGTERM, SIG_DFL); + /* Don't block any signals */ + { + sigset_t sigmask; + sigemptyset (&sigmask); + pthread_sigmask (SIG_SETMASK, &sigmask, NULL); + } /* Passing `pcap_device == NULL' is okay and the same as passign "any" */ - DBG ("Creating PCAP object.."); + DEBUG ("Creating PCAP object.."); pcap_obj = pcap_open_live (pcap_device, PCAP_SNAPLEN, 0 /* Not promiscuous */, - 0 /* no read timeout */, + interval_g, pcap_error); if (pcap_obj == NULL) { - syslog (LOG_ERR, "dns plugin: Opening interface `%s' failed: %s", + ERROR ("dns plugin: Opening interface `%s' " + "failed: %s", (pcap_device != NULL) ? pcap_device : "any", pcap_error); - close (pipe_fd); - pipe_fd = -1; - return; + return (NULL); } memset (&fp, 0, sizeof (fp)); if (pcap_compile (pcap_obj, &fp, "udp port 53", 1, 0) < 0) { - DBG ("pcap_compile failed"); - syslog (LOG_ERR, "dns plugin: pcap_compile failed"); - close (pipe_fd); - pipe_fd = -1; - return; + ERROR ("dns plugin: pcap_compile failed"); + return (NULL); } if (pcap_setfilter (pcap_obj, &fp) < 0) { - DBG ("pcap_setfilter failed"); - syslog (LOG_ERR, "dns plugin: pcap_setfilter failed"); - close (pipe_fd); - pipe_fd = -1; - return; + ERROR ("dns plugin: pcap_setfilter failed"); + return (NULL); } - DBG ("PCAP object created."); + DEBUG ("PCAP object created."); dnstop_set_pcap_obj (pcap_obj); dnstop_set_callback (dns_child_callback); - /* Set up pipe end */ - poll_fds[0].fd = pipe_fd; - poll_fds[0].events = POLLOUT; + status = pcap_loop (pcap_obj, + -1 /* loop forever */, + handle_pcap /* callback */, + NULL /* Whatever this means.. */); + if (status < 0) + ERROR ("dns plugin: Listener thread is exiting " + "abnormally: %s", pcap_geterr (pcap_obj)); - /* Set up pcap device */ - poll_fds[1].fd = pcap_fileno (pcap_obj); - poll_fds[1].events = POLLIN | POLLPRI; + DEBUG ("child is exiting"); - while (pipe_fd > 0) - { - DBG ("poll (...)"); - status = poll (poll_fds, 2, -1 /* wait forever for a change */); - - /* Signals are not caught, but this is very handy when - * attaching to the process with a debugger. -octo */ - if ((status < 0) && (errno == EINTR)) - { - errno = 0; - continue; - } - - if (status < 0) - { - syslog (LOG_ERR, "dns plugin: poll(2) failed: %s", - strerror (errno)); - break; - } - - if (poll_fds[0].revents & (POLLERR | POLLHUP | POLLNVAL)) - { - DBG ("Pipe closed. Exiting."); - syslog (LOG_NOTICE, "dns plugin: Pipe closed. Exiting."); - break; - } - else if (poll_fds[0].revents & POLLOUT) - { - DBG ("Sending data.."); - - DBG ("swrite (pipe_fd = %i, tr_queries = %i)", pipe_fd, tr_queries); - if (swrite (pipe_fd, (const void *) &tr_queries, sizeof (tr_queries)) != 0) - { - DBG ("Writing to pipe_fd failed: %s", strerror (errno)); - syslog (LOG_ERR, "dns plugin: Writing to pipe_fd failed: %s", - strerror (errno)); - return; - } - - DBG ("swrite (pipe_fd = %i, tr_responses = %i)", pipe_fd, tr_responses); - if (swrite (pipe_fd, (const void *) &tr_responses, sizeof (tr_responses)) != 0) - { - DBG ("Writing to pipe_fd failed: %s", strerror (errno)); - syslog (LOG_ERR, "dns plugin: Writing to pipe_fd failed: %s", - strerror (errno)); - return; - } - - counter_list_send (qtype_list, pipe_fd); - counter_list_send (opcode_list, pipe_fd); - counter_list_send (rcode_list, pipe_fd); - } - - if (poll_fds[1].revents & (POLLERR | POLLHUP | POLLNVAL)) - { - DBG ("pcap-device closed. Exiting."); - syslog (LOG_ERR, "dns plugin: pcap-device closed. Exiting."); - break; - } - else if (poll_fds[1].revents & (POLLIN | POLLPRI)) - { - status = pcap_dispatch (pcap_obj, - 10 /* Only handle 10 packets at a time */, - handle_pcap /* callback */, - NULL /* Whatever this means.. */); - if (status < 0) - { - DBG ("pcap_dispatch failed: %s", pcap_geterr (pcap_obj)); - syslog (LOG_ERR, "dns plugin: pcap_dispatch failed: %s", - pcap_geterr (pcap_obj)); - break; - } - } - } /* while (42) */ - - DBG ("child is exiting"); - - close (pipe_fd); - pipe_fd = -1; pcap_close (pcap_obj); + listen_thread_init = 0; + pthread_exit (NULL); + + return (NULL); } /* static void dns_child_loop (void) */ -static void dns_init (void) +static int dns_init (void) { -#if HAVE_LIBPCAP - int pipe_fds[2]; - pid_t pid_child; + /* clean up an old thread */ + int status; + pthread_mutex_lock (&traffic_mutex); tr_queries = 0; tr_responses = 0; + pthread_mutex_unlock (&traffic_mutex); - if (pipe (pipe_fds) != 0) - { - syslog (LOG_ERR, "dns plugin: pipe(2) failed: %s", - strerror (errno)); - return; - } + if (listen_thread_init != 0) + return (-1); - /* Fork off child */ - pid_child = fork (); - if (pid_child < 0) + status = pthread_create (&listen_thread, NULL, dns_child_loop, + (void *) 0); + if (status != 0) { - syslog (LOG_ERR, "dns plugin: fork(2) failed: %s", - strerror (errno)); - close (pipe_fds[0]); - close (pipe_fds[1]); - return; - } - else if (pid_child != 0) - { - /* parent: Close the writing end, keep the reading end. */ - pipe_fd = pipe_fds[0]; - close (pipe_fds[1]); - } - else - { - /* child: Close the reading end, keep the writing end. */ - pipe_fd = pipe_fds[1]; - close (pipe_fds[0]); - - dns_child_loop (); - exit (0); + char errbuf[1024]; + ERROR ("dns plugin: pthread_create failed: %s", + sstrerror (errno, errbuf, sizeof (errbuf))); + return (-1); } - /* fcntl (pipe_fd, F_SETFL, O_NONBLOCK); */ -#endif -} - -static void traffic_write (char *host, char *inst, char *val) -{ - rrd_update_file (host, traffic_file, val, - traffic_ds_def, traffic_ds_num); -} - -static void qtype_write (char *host, char *inst, char *val) -{ - char file[512]; - int status; - - status = snprintf (file, 512, qtype_file, inst); - if (status < 1) - return; - else if (status >= 512) - return; - - rrd_update_file (host, file, val, qtype_ds_def, qtype_ds_num); -} - -static void rcode_write (char *host, char *inst, char *val) -{ - char file[512]; - int status; - - status = snprintf (file, 512, rcode_file, inst); - if (status < 1) - return; - else if (status >= 512) - return; - - rrd_update_file (host, file, val, rcode_ds_def, rcode_ds_num); -} - -static void opcode_write (char *host, char *inst, char *val) -{ - char file[512]; - int status; - - status = snprintf (file, 512, opcode_file, inst); - if (status < 1) - return; - else if (status >= 512) - return; - - rrd_update_file (host, file, val, opcode_ds_def, opcode_ds_num); -} + listen_thread_init = 1; -static void traffic_submit (unsigned int queries, unsigned int replies) -{ - char buffer[64]; - int status; - - status = snprintf (buffer, 64, "N:%u:%u", queries, replies); - if ((status < 1) || (status >= 64)) - return; - - plugin_submit ("dns_traffic", "-", buffer); -} + return (0); +} /* int dns_init */ -static void qtype_submit (int qtype, unsigned int counter) +static void submit_counter (const char *type, const char *type_instance, + counter_t value) { - char inst[32]; - char buffer[32]; - int status; + value_t values[1]; + value_list_t vl = VALUE_LIST_INIT; - strncpy (inst, qtype_str (qtype), 32); - inst[31] = '\0'; + values[0].counter = value; - status = snprintf (buffer, 32, "N:%u", counter); - if ((status < 1) || (status >= 32)) - return; + vl.values = values; + vl.values_len = 1; + sstrncpy (vl.host, hostname_g, sizeof (vl.host)); + sstrncpy (vl.plugin, "dns", sizeof (vl.plugin)); + sstrncpy (vl.type, type, sizeof (vl.type)); + sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance)); - plugin_submit ("dns_qtype", inst, buffer); -} + plugin_dispatch_values (&vl); +} /* void submit_counter */ -static void rcode_submit (int rcode, unsigned int counter) +static void submit_octets (counter_t queries, counter_t responses) { - char inst[32]; - char buffer[32]; - int status; + value_t values[2]; + value_list_t vl = VALUE_LIST_INIT; - strncpy (inst, rcode_str (rcode), 32); - inst[31] = '\0'; + values[0].counter = queries; + values[1].counter = responses; - status = snprintf (buffer, 32, "N:%u", counter); - if ((status < 1) || (status >= 32)) - return; + vl.values = values; + vl.values_len = 2; + sstrncpy (vl.host, hostname_g, sizeof (vl.host)); + sstrncpy (vl.plugin, "dns", sizeof (vl.plugin)); + sstrncpy (vl.type, "dns_octets", sizeof (vl.type)); - plugin_submit ("dns_rcode", inst, buffer); -} + plugin_dispatch_values (&vl); +} /* void submit_counter */ -static void opcode_submit (int opcode, unsigned int counter) +static int dns_read (void) { - char inst[32]; - char buffer[32]; - int status; - - strncpy (inst, opcode_str (opcode), 32); - inst[31] = '\0'; + unsigned int keys[T_MAX]; + unsigned int values[T_MAX]; + int len; + int i; - status = snprintf (buffer, 32, "N:%u", counter); - if ((status < 1) || (status >= 32)) - return; + counter_list_t *ptr; - plugin_submit ("dns_opcode", inst, buffer); -} + pthread_mutex_lock (&traffic_mutex); + values[0] = tr_queries; + values[1] = tr_responses; + pthread_mutex_unlock (&traffic_mutex); -#if NAMED_HAVE_READ -static unsigned int dns_read_array (unsigned int *values) -{ - unsigned int values_num; + if ((values[0] != 0) || (values[1] != 0)) + submit_octets (values[0], values[1]); - if (pipe_fd < 0) - return (0); - - if (sread (pipe_fd, (void *) &values_num, sizeof (values_num)) != 0) + pthread_mutex_lock (&qtype_mutex); + for (ptr = qtype_list, len = 0; + (ptr != NULL) && (len < T_MAX); + ptr = ptr->next, len++) { - DBG ("Reading from the pipe failed: %s", - strerror (errno)); - syslog (LOG_ERR, "dns plugin: Reading from the pipe failed: %s", - strerror (errno)); - pipe_fd = -1; - return (0); + keys[len] = ptr->key; + values[len] = ptr->value; } - DBG ("sread (pipe_fd = %i, values_num = %u)", pipe_fd, values_num); - - assert (values_num <= T_MAX); - - if (values_num == 0) - return (0); + pthread_mutex_unlock (&qtype_mutex); - if (sread (pipe_fd, (void *) values, 2 * sizeof (unsigned int) * values_num) != 0) + for (i = 0; i < len; i++) { - DBG ("Reading from the pipe failed: %s", - strerror (errno)); - syslog (LOG_ERR, "dns plugin: Reading from the pipe failed: %s", - strerror (errno)); - pipe_fd = -1; - return (0); + DEBUG ("qtype = %u; counter = %u;", keys[i], values[i]); + submit_counter ("dns_qtype", qtype_str (keys[i]), values[i]); } - return (values_num); -} - -static void dns_read (void) -{ - unsigned int values[2 * T_MAX]; - unsigned int values_num; - int i; - - if (pipe_fd < 0) - return; - - if (sread (pipe_fd, (void *) &tr_queries, sizeof (tr_queries)) != 0) + pthread_mutex_lock (&opcode_mutex); + for (ptr = opcode_list, len = 0; + (ptr != NULL) && (len < T_MAX); + ptr = ptr->next, len++) { - DBG ("Reading from the pipe failed: %s", - strerror (errno)); - syslog (LOG_ERR, "dns plugin: Reading from the pipe failed: %s", - strerror (errno)); - pipe_fd = -1; - return; + keys[len] = ptr->key; + values[len] = ptr->value; } - DBG ("sread (pipe_fd = %i, tr_queries = %u)", pipe_fd, tr_queries); + pthread_mutex_unlock (&opcode_mutex); - if (sread (pipe_fd, (void *) &tr_responses, sizeof (tr_responses)) != 0) + for (i = 0; i < len; i++) { - DBG ("Reading from the pipe failed: %s", - strerror (errno)); - syslog (LOG_ERR, "dns plugin: Reading from the pipe failed: %s", - strerror (errno)); - pipe_fd = -1; - return; + DEBUG ("opcode = %u; counter = %u;", keys[i], values[i]); + submit_counter ("dns_opcode", opcode_str (keys[i]), values[i]); } - DBG ("sread (pipe_fd = %i, tr_responses = %u)", pipe_fd, tr_responses); - - traffic_submit (tr_queries, tr_responses); - values_num = dns_read_array (values); - for (i = 0; i < values_num; i++) + pthread_mutex_lock (&rcode_mutex); + for (ptr = rcode_list, len = 0; + (ptr != NULL) && (len < T_MAX); + ptr = ptr->next, len++) { - DBG ("qtype = %u; counter = %u;", values[2 * i], values[(2 * i) + 1]); - qtype_submit (values[2 * i], values[(2 * i) + 1]); + keys[len] = ptr->key; + values[len] = ptr->value; } + pthread_mutex_unlock (&rcode_mutex); - values_num = dns_read_array (values); - for (i = 0; i < values_num; i++) + for (i = 0; i < len; i++) { - DBG ("opcode = %u; counter = %u;", values[2 * i], values[(2 * i) + 1]); - opcode_submit (values[2 * i], values[(2 * i) + 1]); + DEBUG ("rcode = %u; counter = %u;", keys[i], values[i]); + submit_counter ("dns_rcode", rcode_str (keys[i]), values[i]); } - values_num = dns_read_array (values); - for (i = 0; i < values_num; i++) - { - DBG ("rcode = %u; counter = %u;", values[2 * i], values[(2 * i) + 1]); - rcode_submit (values[2 * i], values[(2 * i) + 1]); - } -} -#else /* if !NAMED_HAVE_READ */ -# define dns_read NULL -#endif + return (0); +} /* int dns_read */ void module_register (void) { - plugin_register (MODULE_NAME, dns_init, dns_read, NULL); - plugin_register ("dns_traffic", NULL, NULL, traffic_write); - plugin_register ("dns_qtype", NULL, NULL, qtype_write); - plugin_register ("dns_rcode", NULL, NULL, rcode_write); - plugin_register ("dns_opcode", NULL, NULL, opcode_write); - cf_register (MODULE_NAME, dns_config, config_keys, config_keys_num); -} - -#undef MODULE_NAME + plugin_register_config ("dns", dns_config, config_keys, config_keys_num); + plugin_register_init ("dns", dns_init); + plugin_register_read ("dns", dns_read); +} /* void module_register */