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Diffstat (limited to '')
| -rw-r--r-- | plugins/netutils.c | 379 |
1 files changed, 379 insertions, 0 deletions
diff --git a/plugins/netutils.c b/plugins/netutils.c new file mode 100644 index 0000000..1bb4f07 --- /dev/null +++ b/plugins/netutils.c @@ -0,0 +1,379 @@ +/***************************************************************************** +* +* Monitoring Plugins network utilities +* +* License: GPL +* Copyright (c) 1999 Ethan Galstad (nagios@nagios.org) +* Copyright (c) 2003-2008 Monitoring Plugins Development Team +* +* Description: +* +* This file contains commons functions used in many of the plugins. +* +* +* 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 3 of the License, or +* (at your option) any later version. +* +* This program is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU General Public License for more details. +* +* You should have received a copy of the GNU General Public License +* along with this program. If not, see <http://www.gnu.org/licenses/>. +* +* +*****************************************************************************/ + +#include "common.h" +#include "netutils.h" + +unsigned int socket_timeout = DEFAULT_SOCKET_TIMEOUT; +unsigned int socket_timeout_state = STATE_CRITICAL; + +int econn_refuse_state = STATE_CRITICAL; +int was_refused = FALSE; +#if USE_IPV6 +int address_family = AF_UNSPEC; +#else +int address_family = AF_INET; +#endif + +/* handles socket timeouts */ +void +socket_timeout_alarm_handler (int sig) +{ + if (sig == SIGALRM) + printf (_("%s - Socket timeout after %d seconds\n"), state_text(socket_timeout_state), socket_timeout); + else + printf (_("%s - Abnormal timeout after %d seconds\n"), state_text(socket_timeout_state), socket_timeout); + + exit (socket_timeout_state); +} + + +/* connects to a host on a specified tcp port, sends a string, and gets a + response. loops on select-recv until timeout or eof to get all of a + multi-packet answer */ +int +process_tcp_request2 (const char *server_address, int server_port, + const char *send_buffer, char *recv_buffer, int recv_size) +{ + + int result; + int send_result; + int recv_result; + int sd; + struct timeval tv; + fd_set readfds; + int recv_length = 0; + + result = np_net_connect (server_address, server_port, &sd, IPPROTO_TCP); + if (result != STATE_OK) + return STATE_CRITICAL; + + send_result = send (sd, send_buffer, strlen (send_buffer), 0); + if (send_result<0 || (size_t)send_result!=strlen(send_buffer)) { + printf ("%s\n", _("Send failed")); + result = STATE_WARNING; + } + + while (1) { + /* wait up to the number of seconds for socket timeout + minus one for data from the host */ + tv.tv_sec = socket_timeout - 1; + tv.tv_usec = 0; + FD_ZERO (&readfds); + FD_SET (sd, &readfds); + select (sd + 1, &readfds, NULL, NULL, &tv); + + /* make sure some data has arrived */ + if (!FD_ISSET (sd, &readfds)) { /* it hasn't */ + if (!recv_length) { + strcpy (recv_buffer, ""); + printf ("%s\n", _("No data was received from host!")); + result = STATE_WARNING; + } + else { /* this one failed, but previous ones worked */ + recv_buffer[recv_length] = 0; + } + break; + } + else { /* it has */ + recv_result = + recv (sd, recv_buffer + recv_length, + (size_t)recv_size - recv_length - 1, 0); + if (recv_result == -1) { + /* recv failed, bail out */ + strcpy (recv_buffer + recv_length, ""); + result = STATE_WARNING; + break; + } + else if (recv_result == 0) { + /* end of file ? */ + recv_buffer[recv_length] = 0; + break; + } + else { /* we got data! */ + recv_length += recv_result; + if (recv_length >= recv_size - 1) { + /* buffer full, we're done */ + recv_buffer[recv_size - 1] = 0; + break; + } + } + } + /* end if(!FD_ISSET(sd,&readfds)) */ + } + /* end while(1) */ + + close (sd); + return result; +} + + +/* connects to a host on a specified port, sends a string, and gets a + response */ +int +process_request (const char *server_address, int server_port, int proto, + const char *send_buffer, char *recv_buffer, int recv_size) +{ + int result; + int sd; + + result = STATE_OK; + + result = np_net_connect (server_address, server_port, &sd, proto); + if (result != STATE_OK) + return STATE_CRITICAL; + + result = send_request (sd, proto, send_buffer, recv_buffer, recv_size); + + close (sd); + + return result; +} + + +/* opens a tcp or udp connection to a remote host or local socket */ +int +np_net_connect (const char *host_name, int port, int *sd, int proto) +{ + /* send back STATE_UNKOWN if there's an error + send back STATE_OK if we connect + send back STATE_CRITICAL if we can't connect. + Let upstream figure out what to send to the user. */ + struct addrinfo hints; + struct addrinfo *r, *res; + struct sockaddr_un su; + char port_str[6], host[MAX_HOST_ADDRESS_LENGTH]; + size_t len; + int socktype, result; + short is_socket = (host_name[0] == '/'); + + socktype = (proto == IPPROTO_UDP) ? SOCK_DGRAM : SOCK_STREAM; + + /* as long as it doesn't start with a '/', it's assumed a host or ip */ + if (!is_socket){ + memset (&hints, 0, sizeof (hints)); + hints.ai_family = address_family; + hints.ai_protocol = proto; + hints.ai_socktype = socktype; + + len = strlen (host_name); + /* check for an [IPv6] address (and strip the brackets) */ + if (len >= 2 && host_name[0] == '[' && host_name[len - 1] == ']') { + host_name++; + len -= 2; + } + if (len >= sizeof(host)) + return STATE_UNKNOWN; + memcpy (host, host_name, len); + host[len] = '\0'; + snprintf (port_str, sizeof (port_str), "%d", port); + result = getaddrinfo (host, port_str, &hints, &res); + + if (result != 0) { + printf ("%s\n", gai_strerror (result)); + return STATE_UNKNOWN; + } + + r = res; + while (r) { + /* attempt to create a socket */ + *sd = socket (r->ai_family, socktype, r->ai_protocol); + + if (*sd < 0) { + printf ("%s\n", _("Socket creation failed")); + freeaddrinfo (r); + return STATE_UNKNOWN; + } + + /* attempt to open a connection */ + result = connect (*sd, r->ai_addr, r->ai_addrlen); + + if (result == 0) { + was_refused = FALSE; + break; + } + + if (result < 0) { + switch (errno) { + case ECONNREFUSED: + was_refused = TRUE; + break; + } + } + + close (*sd); + r = r->ai_next; + } + freeaddrinfo (res); + } + /* else the hostname is interpreted as a path to a unix socket */ + else { + if(strlen(host_name) >= UNIX_PATH_MAX){ + die(STATE_UNKNOWN, _("Supplied path too long unix domain socket")); + } + memset(&su, 0, sizeof(su)); + su.sun_family = AF_UNIX; + strncpy(su.sun_path, host_name, UNIX_PATH_MAX); + *sd = socket(PF_UNIX, SOCK_STREAM, 0); + if(*sd < 0){ + die(STATE_UNKNOWN, _("Socket creation failed")); + } + result = connect(*sd, (struct sockaddr *)&su, sizeof(su)); + if (result < 0 && errno == ECONNREFUSED) + was_refused = TRUE; + } + + if (result == 0) + return STATE_OK; + else if (was_refused) { + switch (econn_refuse_state) { /* a user-defined expected outcome */ + case STATE_OK: + case STATE_WARNING: /* user wants WARN or OK on refusal, or... */ + case STATE_CRITICAL: /* user did not set econn_refuse_state, or wanted critical */ + if (is_socket) + printf("connect to file socket %s: %s\n", host_name, strerror(errno)); + else + printf("connect to address %s and port %d: %s\n", + host_name, port, strerror(errno)); + return STATE_CRITICAL; + break; + default: /* it's a logic error if we do not end up in STATE_(OK|WARNING|CRITICAL) */ + return STATE_UNKNOWN; + break; + } + } + else { + if (is_socket) + printf("connect to file socket %s: %s\n", host_name, strerror(errno)); + else + printf("connect to address %s and port %d: %s\n", + host_name, port, strerror(errno)); + return STATE_CRITICAL; + } +} + +int +send_request (int sd, int proto, const char *send_buffer, char *recv_buffer, int recv_size) +{ + int result = STATE_OK; + int send_result; + int recv_result; + struct timeval tv; + fd_set readfds; + + send_result = send (sd, send_buffer, strlen (send_buffer), 0); + if (send_result<0 || (size_t)send_result!=strlen(send_buffer)) { + printf ("%s\n", _("Send failed")); + result = STATE_WARNING; + } + + /* wait up to the number of seconds for socket timeout minus one + for data from the host */ + tv.tv_sec = socket_timeout - 1; + tv.tv_usec = 0; + FD_ZERO (&readfds); + FD_SET (sd, &readfds); + select (sd + 1, &readfds, NULL, NULL, &tv); + + /* make sure some data has arrived */ + if (!FD_ISSET (sd, &readfds)) { + strcpy (recv_buffer, ""); + printf ("%s\n", _("No data was received from host!")); + result = STATE_WARNING; + } + + else { + recv_result = recv (sd, recv_buffer, (size_t)recv_size - 1, 0); + if (recv_result == -1) { + strcpy (recv_buffer, ""); + if (proto != IPPROTO_TCP) + printf ("%s\n", _("Receive failed")); + result = STATE_WARNING; + } + else + recv_buffer[recv_result] = 0; + + /* die returned string */ + recv_buffer[recv_size - 1] = 0; + } + return result; +} + + +int +is_host (const char *address) +{ + if (is_addr (address) || is_hostname (address)) + return (TRUE); + + return (FALSE); +} + +void +host_or_die(const char *str) +{ + if(!str || (!is_addr(str) && !is_hostname(str))) + usage_va(_("Invalid hostname/address - %s"), str); +} + +int +is_addr (const char *address) +{ +#ifdef USE_IPV6 + if (address_family == AF_INET && is_inet_addr (address)) + return TRUE; + else if (address_family == AF_INET6 && is_inet6_addr (address)) + return TRUE; +#else + if (is_inet_addr (address)) + return (TRUE); +#endif + + return (FALSE); +} + +int +dns_lookup (const char *in, struct sockaddr_storage *ss, int family) +{ + struct addrinfo hints; + struct addrinfo *res; + int retval; + + memset (&hints, 0, sizeof(struct addrinfo)); + hints.ai_family = family; + + retval = getaddrinfo (in, NULL, &hints, &res); + if (retval != 0) + return FALSE; + + if (ss != NULL) + memcpy (ss, res->ai_addr, res->ai_addrlen); + freeaddrinfo (res); + return TRUE; +} |