1 files changed, 120 insertions, 112 deletions

diff --git a/plugins/netutils.c b/plugins/netutils.c
index e2916c65..f9933ebd 100644
--- a/plugins/netutils.c
+++ b/plugins/netutils.c
@@ -30,18 +30,15 @@
 #include "common.h"
 #include "output.h"
 #include "states.h"
+#include <sys/types.h>
 #include "netutils.h"
 
 unsigned int socket_timeout = DEFAULT_SOCKET_TIMEOUT;
-unsigned int socket_timeout_state = STATE_CRITICAL;
-
-int econn_refuse_state = STATE_CRITICAL;
+mp_state_enum socket_timeout_state = STATE_CRITICAL;
+mp_state_enum econn_refuse_state = STATE_CRITICAL;
 bool 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) {
@@ -63,38 +60,40 @@ void socket_timeout_alarm_handler(int sig) {
 /* 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) {
+mp_state_enum process_tcp_request2(const char *server_address, const int server_port,
+                                                                   const char *send_buffer, char *recv_buffer,
+                                                                   const int recv_size) {
 
-        int result;
-        int send_result;
-        int recv_result;
-        int sd;
-        struct timeval tv;
-        fd_set readfds;
-        int recv_length = 0;
+        int socket;
 
-        result = np_net_connect(server_address, server_port, &sd, IPPROTO_TCP);
-        if (result != STATE_OK) {
+        mp_state_enum connect_result =
+                np_net_connect(server_address, server_port, &socket, IPPROTO_TCP);
+        if (connect_result != STATE_OK) {
                 return STATE_CRITICAL;
         }
 
-        send_result = send(sd, send_buffer, strlen(send_buffer), 0);
+        mp_state_enum result;
+        ssize_t send_result = send(socket, 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) {
+        fd_set readfds;
+        ssize_t recv_length = 0;
+        while (true) {
                 /* 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;
+                struct timeval timeout = {
+                        .tv_sec = socket_timeout - 1,
+                        .tv_usec = 0,
+                };
                 FD_ZERO(&readfds);
-                FD_SET(sd, &readfds);
-                select(sd + 1, &readfds, NULL, NULL, &tv);
+                FD_SET(socket, &readfds);
+                select(socket + 1, &readfds, NULL, NULL, &timeout);
 
                 /* make sure some data has arrived */
-                if (!FD_ISSET(sd, &readfds)) { /* it hasn't */
+                if (!FD_ISSET(socket, &readfds)) { /* it hasn't */
                         if (!recv_length) {
                                 strcpy(recv_buffer, "");
                                 // printf("%s\n", _("No data was received from host!"));
@@ -103,70 +102,69 @@ int process_tcp_request2(const char *server_address, int server_port, const char
                                 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;
-                                }
-                        }
+                } /* it has */
+
+                ssize_t recv_result =
+                        recv(socket, 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;
+                }
+
+                if (recv_result == 0) {
+                        /* end of file ? */
+                        recv_buffer[recv_length] = 0;
+                        break;
+                }
+
+                /* 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);
+        close(socket);
         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;
+mp_state_enum process_request(const char *server_address, const int server_port, const int proto,
+                                                          const char *send_buffer, char *recv_buffer, const int recv_size) {
 
-        result = STATE_OK;
-
-        result = np_net_connect(server_address, server_port, &sd, proto);
+        mp_state_enum result = STATE_OK;
+        int socket;
+        result = np_net_connect(server_address, server_port, &socket, proto);
         if (result != STATE_OK) {
                 return STATE_CRITICAL;
         }
 
-        result = send_request(sd, proto, send_buffer, recv_buffer, recv_size);
+        result = send_request(socket, proto, send_buffer, recv_buffer, recv_size);
 
-        close(sd);
+        close(socket);
 
         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) {
+mp_state_enum np_net_connect(const char *host_name, int port, int *socketDescriptor,
+                                                         const 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;
+        bool is_socket = (host_name[0] == '/');
+        int socktype = (proto == IPPROTO_UDP) ? SOCK_DGRAM : SOCK_STREAM;
 
+        struct addrinfo hints = {};
+        struct addrinfo *res = NULL;
+        int result;
         /* as long as it doesn't start with a '/', it's assumed a host or ip */
         if (!is_socket) {
                 memset(&hints, 0, sizeof(hints));
@@ -174,38 +172,46 @@ int np_net_connect(const char *host_name, int port, int *sd, int proto) {
                 hints.ai_protocol = proto;
                 hints.ai_socktype = socktype;
 
-                len = strlen(host_name);
+                size_t 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;
                 }
+
+                char host[MAX_HOST_ADDRESS_LENGTH];
+
                 if (len >= sizeof(host)) {
                         return STATE_UNKNOWN;
                 }
+
                 memcpy(host, host_name, len);
                 host[len] = '\0';
+
+                char port_str[6];
                 snprintf(port_str, sizeof(port_str), "%d", port);
-                result = getaddrinfo(host, port_str, &hints, &res);
+                int getaddrinfo_err = getaddrinfo(host, port_str, &hints, &res);
 
-                if (result != 0) {
+                if (getaddrinfo_err != 0) {
                         // printf("%s\n", gai_strerror(result));
                         return STATE_UNKNOWN;
                 }
 
-                r = res;
-                while (r) {
+                struct addrinfo *addressPointer = res;
+                while (addressPointer) {
                         /* attempt to create a socket */
-                        *sd = socket(r->ai_family, socktype, r->ai_protocol);
+                        *socketDescriptor =
+                                socket(addressPointer->ai_family, socktype, addressPointer->ai_protocol);
 
-                        if (*sd < 0) {
+                        if (*socketDescriptor < 0) {
                                 // printf("%s\n", _("Socket creation failed"));
-                                freeaddrinfo(r);
+                                freeaddrinfo(addressPointer);
                                 return STATE_UNKNOWN;
                         }
 
                         /* attempt to open a connection */
-                        result = connect(*sd, r->ai_addr, r->ai_addrlen);
+                        result =
+                                connect(*socketDescriptor, addressPointer->ai_addr, addressPointer->ai_addrlen);
 
                         if (result == 0) {
                                 was_refused = false;
@@ -220,24 +226,28 @@ int np_net_connect(const char *host_name, int port, int *sd, int proto) {
                                 }
                         }
 
-                        close(*sd);
-                        r = r->ai_next;
+                        close(*socketDescriptor);
+                        addressPointer = addressPointer->ai_next;
                 }
+
                 freeaddrinfo(res);
-        }
-        /* else the hostname is interpreted as a path to a unix socket */
-        else {
+
+        } else {
+                /* else the hostname is interpreted as a path to a unix socket */
                 if (strlen(host_name) >= UNIX_PATH_MAX) {
                         die(STATE_UNKNOWN, _("Supplied path too long unix domain socket"));
                 }
-                memset(&su, 0, sizeof(su));
+
+                struct sockaddr_un 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) {
+                *socketDescriptor = socket(PF_UNIX, SOCK_STREAM, 0);
+
+                if (*socketDescriptor < 0) {
                         die(STATE_UNKNOWN, _("Socket creation failed"));
                 }
-                result = connect(*sd, (struct sockaddr *)&su, sizeof(su));
+
+                result = connect(*socketDescriptor, (struct sockaddr *)&su, sizeof(su));
                 if (result < 0 && errno == ECONNREFUSED) {
                         was_refused = true;
                 }
@@ -245,7 +255,9 @@ int np_net_connect(const char *host_name, int port, int *sd, int proto) {
 
         if (result == 0) {
                 return STATE_OK;
-        } else if (was_refused) {
+        }
+
+        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... */
@@ -253,7 +265,8 @@ int np_net_connect(const char *host_name, int port, int *sd, int proto) {
                         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));
+                                // printf("connect to address %s and port %d: %s\n", host_name, port,
+                                // strerror(errno));
                         }
                         return STATE_CRITICAL;
                         break;
@@ -271,14 +284,11 @@ int np_net_connect(const char *host_name, int port, int *sd, int proto) {
         }
 }
 
-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;
+mp_state_enum send_request(const int socket, const int proto, const char *send_buffer,
+                                                   char *recv_buffer, const int recv_size) {
+        mp_state_enum result = STATE_OK;
 
-        send_result = send(sd, send_buffer, strlen(send_buffer), 0);
+        ssize_t send_result = send(socket, 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;
@@ -286,21 +296,22 @@ int send_request(int sd, int proto, const char *send_buffer, char *recv_buffer,
 
         /* 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;
+        struct timeval timestamp = {
+                .tv_sec = socket_timeout - 1,
+                .tv_usec = 0,
+        };
+        fd_set readfds;
         FD_ZERO(&readfds);
-        FD_SET(sd, &readfds);
-        select(sd + 1, &readfds, NULL, NULL, &tv);
+        FD_SET(socket, &readfds);
+        select(socket + 1, &readfds, NULL, NULL, &timestamp);
 
         /* make sure some data has arrived */
-        if (!FD_ISSET(sd, &readfds)) {
+        if (!FD_ISSET(socket, &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);
+        } else {
+                ssize_t recv_result = recv(socket, recv_buffer, (size_t)(recv_size - 1), 0);
                 if (recv_result == -1) {
                         strcpy(recv_buffer, "");
                         if (proto != IPPROTO_TCP) {
@@ -314,6 +325,7 @@ int send_request(int sd, int proto, const char *send_buffer, char *recv_buffer,
                 /* die returned string */
                 recv_buffer[recv_size - 1] = 0;
         }
+
         return result;
 }
 
@@ -332,30 +344,24 @@ void host_or_die(const char *str) {
 }
 
 bool 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);
+
+        if (address_family == AF_INET6 && is_inet6_addr(address)) {
+                return true;
         }
-#endif
 
-        return (false);
+        return false;
 }
 
-int dns_lookup(const char *in, struct sockaddr_storage *ss, int family) {
+bool dns_lookup(const char *node_string, struct sockaddr_storage *ss, const 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);
+        struct addrinfo *res;
+        int retval = getaddrinfo(node_string, NULL, &hints, &res);
         if (retval != 0) {
                 return false;
         }
@@ -363,6 +369,8 @@ int dns_lookup(const char *in, struct sockaddr_storage *ss, int family) {
         if (ss != NULL) {
                 memcpy(ss, res->ai_addr, res->ai_addrlen);
         }
+
         freeaddrinfo(res);
+
         return true;
 }