New upstream version 1.11.0+dfsgupstream/1.11.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 1518 deletions

diff --git a/src/socket.c b/src/socket.c
deleted file mode 100644
index 8bede73fd..000000000
--- a/src/socket.c
+++ /dev/null
@@ -1,1518 +0,0 @@
-#include "common.h"
-
-// --------------------------------------------------------------------------------------------------------------------
-// various library calls
-
-#ifdef __gnu_linux__
-#define LARGE_SOCK_SIZE 33554431 // don't ask why - I found it at brubeck source - I guess it is just a large number
-#else
-#define LARGE_SOCK_SIZE 4096
-#endif
-
-int sock_setnonblock(int fd) {
-    int flags;
-
-    flags = fcntl(fd, F_GETFL);
-    flags |= O_NONBLOCK;
-
-    int ret = fcntl(fd, F_SETFL, flags);
-    if(ret < 0)
-        error("Failed to set O_NONBLOCK on socket %d", fd);
-
-    return ret;
-}
-
-int sock_delnonblock(int fd) {
-    int flags;
-
-    flags = fcntl(fd, F_GETFL);
-    flags &= ~O_NONBLOCK;
-
-    int ret = fcntl(fd, F_SETFL, flags);
-    if(ret < 0)
-        error("Failed to remove O_NONBLOCK on socket %d", fd);
-
-    return ret;
-}
-
-int sock_setreuse(int fd, int reuse) {
-    int ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
-
-    if(ret == -1)
-        error("Failed to set SO_REUSEADDR on socket %d", fd);
-
-    return ret;
-}
-
-int sock_setreuse_port(int fd, int reuse) {
-    int ret = -1;
-
-#ifdef SO_REUSEPORT
-    ret = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &reuse, sizeof(reuse));
-    if(ret == -1 && errno != ENOPROTOOPT)
-        error("failed to set SO_REUSEPORT on socket %d", fd);
-#endif
-
-    return ret;
-}
-
-int sock_enlarge_in(int fd) {
-    int ret, bs = LARGE_SOCK_SIZE;
-
-    ret = setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bs, sizeof(bs));
-
-    if(ret == -1)
-        error("Failed to set SO_RCVBUF on socket %d", fd);
-
-    return ret;
-}
-
-int sock_enlarge_out(int fd) {
-    int ret, bs = LARGE_SOCK_SIZE;
-    ret = setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &bs, sizeof(bs));
-
-    if(ret == -1)
-        error("Failed to set SO_SNDBUF on socket %d", fd);
-
-    return ret;
-}
-
-
-// --------------------------------------------------------------------------------------------------------------------
-
-char *strdup_client_description(int family, const char *protocol, const char *ip, int port) {
-    char buffer[100 + 1];
-
-    switch(family) {
-        case AF_INET:
-            snprintfz(buffer, 100, "%s:%s:%d", protocol, ip, port);
-            break;
-
-        case AF_INET6:
-        default:
-            snprintfz(buffer, 100, "%s:[%s]:%d", protocol, ip, port);
-            break;
-
-        case AF_UNIX:
-            snprintfz(buffer, 100, "%s:%s", protocol, ip);
-            break;
-    }
-
-    return strdupz(buffer);
-}
-
-// --------------------------------------------------------------------------------------------------------------------
-// listening sockets
-
-int create_listen_socket_unix(const char *path, int listen_backlog) {
-    int sock;
-
-    debug(D_LISTENER, "LISTENER: UNIX creating new listening socket on path '%s'", path);
-
-    sock = socket(AF_UNIX, SOCK_STREAM, 0);
-    if(sock < 0) {
-        error("LISTENER: UNIX socket() on path '%s' failed.", path);
-        return -1;
-    }
-
-    sock_setnonblock(sock);
-    sock_enlarge_in(sock);
-
-    struct sockaddr_un name;
-    memset(&name, 0, sizeof(struct sockaddr_un));
-    name.sun_family = AF_UNIX;
-    strncpy(name.sun_path, path, sizeof(name.sun_path)-1);
-
-    errno = 0;
-    if (unlink(path) == -1 && errno != ENOENT)
-        error("LISTENER: failed to remove existing (probably obsolete or left-over) file on UNIX socket path '%s'.", path);
-
-    if(bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {
-        close(sock);
-        error("LISTENER: UNIX bind() on path '%s' failed.", path);
-        return -1;
-    }
-
-    // we have to chmod this to 0777 so that the client will be able
-    // to read from and write to this socket.
-    if(chmod(path, 0777) == -1)
-        error("LISTENER: failed to chmod() socket file '%s'.", path);
-
-    if(listen(sock, listen_backlog) < 0) {
-        close(sock);
-        error("LISTENER: UNIX listen() on path '%s' failed.", path);
-        return -1;
-    }
-
-    debug(D_LISTENER, "LISTENER: Listening on UNIX path '%s'", path);
-    return sock;
-}
-
-int create_listen_socket4(int socktype, const char *ip, int port, int listen_backlog) {
-    int sock;
-
-    debug(D_LISTENER, "LISTENER: IPv4 creating new listening socket on ip '%s' port %d, socktype %d", ip, port, socktype);
-
-    sock = socket(AF_INET, socktype, 0);
-    if(sock < 0) {
-        error("LISTENER: IPv4 socket() on ip '%s' port %d, socktype %d failed.", ip, port, socktype);
-        return -1;
-    }
-
-    sock_setreuse(sock, 1);
-    sock_setreuse_port(sock, 1);
-    sock_setnonblock(sock);
-    sock_enlarge_in(sock);
-
-    struct sockaddr_in name;
-    memset(&name, 0, sizeof(struct sockaddr_in));
-    name.sin_family = AF_INET;
-    name.sin_port = htons (port);
-
-    int ret = inet_pton(AF_INET, ip, (void *)&name.sin_addr.s_addr);
-    if(ret != 1) {
-        error("LISTENER: Failed to convert IP '%s' to a valid IPv4 address.", ip);
-        close(sock);
-        return -1;
-    }
-
-    if(bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {
-        close(sock);
-        error("LISTENER: IPv4 bind() on ip '%s' port %d, socktype %d failed.", ip, port, socktype);
-        return -1;
-    }
-
-    if(socktype == SOCK_STREAM && listen(sock, listen_backlog) < 0) {
-        close(sock);
-        error("LISTENER: IPv4 listen() on ip '%s' port %d, socktype %d failed.", ip, port, socktype);
-        return -1;
-    }
-
-    debug(D_LISTENER, "LISTENER: Listening on IPv4 ip '%s' port %d, socktype %d", ip, port, socktype);
-    return sock;
-}
-
-int create_listen_socket6(int socktype, uint32_t scope_id, const char *ip, int port, int listen_backlog) {
-    int sock;
-    int ipv6only = 1;
-
-    debug(D_LISTENER, "LISTENER: IPv6 creating new listening socket on ip '%s' port %d, socktype %d", ip, port, socktype);
-
-    sock = socket(AF_INET6, socktype, 0);
-    if (sock < 0) {
-        error("LISTENER: IPv6 socket() on ip '%s' port %d, socktype %d, failed.", ip, port, socktype);
-        return -1;
-    }
-
-    sock_setreuse(sock, 1);
-    sock_setreuse_port(sock, 1);
-    sock_setnonblock(sock);
-    sock_enlarge_in(sock);
-
-    /* IPv6 only */
-    if(setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&ipv6only, sizeof(ipv6only)) != 0)
-        error("LISTENER: Cannot set IPV6_V6ONLY on ip '%s' port %d, socktype %d.", ip, port, socktype);
-
-    struct sockaddr_in6 name;
-    memset(&name, 0, sizeof(struct sockaddr_in6));
-    name.sin6_family = AF_INET6;
-    name.sin6_port = htons ((uint16_t) port);
-    name.sin6_scope_id = scope_id;
-
-    int ret = inet_pton(AF_INET6, ip, (void *)&name.sin6_addr.s6_addr);
-    if(ret != 1) {
-        error("LISTENER: Failed to convert IP '%s' to a valid IPv6 address.", ip);
-        close(sock);
-        return -1;
-    }
-
-    name.sin6_scope_id = scope_id;
-
-    if (bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {
-        close(sock);
-        error("LISTENER: IPv6 bind() on ip '%s' port %d, socktype %d failed.", ip, port, socktype);
-        return -1;
-    }
-
-    if (socktype == SOCK_STREAM && listen(sock, listen_backlog) < 0) {
-        close(sock);
-        error("LISTENER: IPv6 listen() on ip '%s' port %d, socktype %d failed.", ip, port, socktype);
-        return -1;
-    }
-
-    debug(D_LISTENER, "LISTENER: Listening on IPv6 ip '%s' port %d, socktype %d", ip, port, socktype);
-    return sock;
-}
-
-static inline int listen_sockets_add(LISTEN_SOCKETS *sockets, int fd, int family, int socktype, const char *protocol, const char *ip, int port) {
-    if(sockets->opened >= MAX_LISTEN_FDS) {
-        error("LISTENER: Too many listening sockets. Failed to add listening %s socket at ip '%s' port %d, protocol %s, socktype %d", protocol, ip, port, protocol, socktype);
-        close(fd);
-        return -1;
-    }
-
-    sockets->fds[sockets->opened] = fd;
-    sockets->fds_types[sockets->opened] = socktype;
-    sockets->fds_families[sockets->opened] = family;
-    sockets->fds_names[sockets->opened] = strdup_client_description(family, protocol, ip, port);
-
-    sockets->opened++;
-    return 0;
-}
-
-int listen_sockets_check_is_member(LISTEN_SOCKETS *sockets, int fd) {
-    size_t i;
-    for(i = 0; i < sockets->opened ;i++)
-        if(sockets->fds[i] == fd) return 1;
-
-    return 0;
-}
-
-static inline void listen_sockets_init(LISTEN_SOCKETS *sockets) {
-    size_t i;
-    for(i = 0; i < MAX_LISTEN_FDS ;i++) {
-        sockets->fds[i] = -1;
-        sockets->fds_names[i] = NULL;
-        sockets->fds_types[i] = -1;
-    }
-
-    sockets->opened = 0;
-    sockets->failed = 0;
-}
-
-void listen_sockets_close(LISTEN_SOCKETS *sockets) {
-    size_t i;
-    for(i = 0; i < sockets->opened ;i++) {
-        close(sockets->fds[i]);
-        sockets->fds[i] = -1;
-
-        freez(sockets->fds_names[i]);
-        sockets->fds_names[i] = NULL;
-
-        sockets->fds_types[i] = -1;
-    }
-
-    sockets->opened = 0;
-    sockets->failed = 0;
-}
-
-static inline int bind_to_this(LISTEN_SOCKETS *sockets, const char *definition, int default_port, int listen_backlog) {
-    int added = 0;
-    struct addrinfo hints;
-    struct addrinfo *result = NULL, *rp = NULL;
-
-    char buffer[strlen(definition) + 1];
-    strcpy(buffer, definition);
-
-    char buffer2[10 + 1];
-    snprintfz(buffer2, 10, "%d", default_port);
-
-    char *ip = buffer, *port = buffer2, *interface = "";;
-
-    int protocol = IPPROTO_TCP, socktype = SOCK_STREAM;
-    const char *protocol_str = "tcp";
-
-    if(strncmp(ip, "tcp:", 4) == 0) {
-        ip += 4;
-        protocol = IPPROTO_TCP;
-        socktype = SOCK_STREAM;
-        protocol_str = "tcp";
-    }
-    else if(strncmp(ip, "udp:", 4) == 0) {
-        ip += 4;
-        protocol = IPPROTO_UDP;
-        socktype = SOCK_DGRAM;
-        protocol_str = "udp";
-    }
-    else if(strncmp(ip, "unix:", 5) == 0) {
-        char *path = ip + 5;
-        socktype = SOCK_STREAM;
-        protocol_str = "unix";
-
-        int fd = create_listen_socket_unix(path, listen_backlog);
-        if (fd == -1) {
-            error("LISTENER: Cannot create unix socket '%s'", path);
-            sockets->failed++;
-        }
-        else {
-            listen_sockets_add(sockets, fd, AF_UNIX, socktype, protocol_str, path, 0);
-            added++;
-        }
-        return added;
-    }
-
-    char *e = ip;
-    if(*e == '[') {
-        e = ++ip;
-        while(*e && *e != ']') e++;
-        if(*e == ']') {
-            *e = '\0';
-            e++;
-        }
-    }
-    else {
-        while(*e && *e != ':' && *e != '%') e++;
-    }
-
-    if(*e == '%') {
-        *e = '\0';
-        e++;
-        interface = e;
-        while(*e && *e != ':') e++;
-    }
-
-    if(*e == ':') {
-        port = e + 1;
-        *e = '\0';
-    }
-
-    uint32_t scope_id = 0;
-    if(*interface) {
-        scope_id = if_nametoindex(interface);
-        if(!scope_id)
-            error("LISTENER: Cannot find a network interface named '%s'. Continuing with limiting the network interface", interface);
-    }
-
-    if(!*ip || *ip == '*' || !strcmp(ip, "any") || !strcmp(ip, "all"))
-        ip = NULL;
-
-    if(!*port)
-        port = buffer2;
-
-    memset(&hints, 0, sizeof(hints));
-    hints.ai_family = AF_UNSPEC;  /* Allow IPv4 or IPv6 */
-    hints.ai_socktype = socktype;
-    hints.ai_flags = AI_PASSIVE;  /* For wildcard IP address */
-    hints.ai_protocol = protocol;
-    hints.ai_canonname = NULL;
-    hints.ai_addr = NULL;
-    hints.ai_next = NULL;
-
-    int r = getaddrinfo(ip, port, &hints, &result);
-    if (r != 0) {
-        error("LISTENER: getaddrinfo('%s', '%s'): %s\n", ip, port, gai_strerror(r));
-        return -1;
-    }
-
-    for (rp = result; rp != NULL; rp = rp->ai_next) {
-        int fd = -1;
-        int family = -1;
-
-        char rip[INET_ADDRSTRLEN + INET6_ADDRSTRLEN] = "INVALID";
-        int rport = default_port;
-
-        family = rp->ai_addr->sa_family;
-        switch (family) {
-            case AF_INET: {
-                struct sockaddr_in *sin = (struct sockaddr_in *) rp->ai_addr;
-                inet_ntop(AF_INET, &sin->sin_addr, rip, INET_ADDRSTRLEN);
-                rport = ntohs(sin->sin_port);
-                // info("Attempting to listen on IPv4 '%s' ('%s'), port %d ('%s'), socktype %d", rip, ip, rport, port, socktype);
-                fd = create_listen_socket4(socktype, rip, rport, listen_backlog);
-                break;
-            }
-
-            case AF_INET6: {
-                struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) rp->ai_addr;
-                inet_ntop(AF_INET6, &sin6->sin6_addr, rip, INET6_ADDRSTRLEN);
-                rport = ntohs(sin6->sin6_port);
-                // info("Attempting to listen on IPv6 '%s' ('%s'), port %d ('%s'), socktype %d", rip, ip, rport, port, socktype);
-                fd = create_listen_socket6(socktype, scope_id, rip, rport, listen_backlog);
-                break;
-            }
-
-            default:
-                debug(D_LISTENER, "LISTENER: Unknown socket family %d", family);
-                break;
-        }
-
-        if (fd == -1) {
-            error("LISTENER: Cannot bind to ip '%s', port %d", rip, rport);
-            sockets->failed++;
-        }
-        else {
-            listen_sockets_add(sockets, fd, family, socktype, protocol_str, rip, rport);
-            added++;
-        }
-    }
-
-    freeaddrinfo(result);
-
-    return added;
-}
-
-int listen_sockets_setup(LISTEN_SOCKETS *sockets) {
-    listen_sockets_init(sockets);
-
-    sockets->backlog = (int) config_get_number(sockets->config_section, "listen backlog", sockets->backlog);
-
-    int old_port = sockets->default_port;
-    sockets->default_port = (int) config_get_number(sockets->config_section, "default port", sockets->default_port);
-    if(sockets->default_port < 1 || sockets->default_port > 65535) {
-        error("LISTENER: Invalid listen port %d given. Defaulting to %d.", sockets->default_port, old_port);
-        sockets->default_port = (int) config_set_number(sockets->config_section, "default port", old_port);
-    }
-    debug(D_OPTIONS, "LISTENER: Default listen port set to %d.", sockets->default_port);
-
-    char *s = config_get(sockets->config_section, "bind to", sockets->default_bind_to);
-    while(*s) {
-        char *e = s;
-
-        // skip separators, moving both s(tart) and e(nd)
-        while(isspace(*e) || *e == ',') s = ++e;
-
-        // move e(nd) to the first separator
-        while(*e && !isspace(*e) && *e != ',') e++;
-
-        // is there anything?
-        if(!*s || s == e) break;
-
-        char buf[e - s + 1];
-        strncpyz(buf, s, e - s);
-        bind_to_this(sockets, buf, sockets->default_port, sockets->backlog);
-
-        s = e;
-    }
-
-    if(sockets->failed) {
-        size_t i;
-        for(i = 0; i < sockets->opened ;i++)
-            info("LISTENER: Listen socket %s opened successfully.", sockets->fds_names[i]);
-    }
-
-    return (int)sockets->opened;
-}
-
-
-// --------------------------------------------------------------------------------------------------------------------
-// connect to another host/port
-
-// connect_to_this_unix()
-// path        the path of the unix socket
-// timeout     the timeout for establishing a connection
-
-static inline int connect_to_unix(const char *path, struct timeval *timeout) {
-    int fd = socket(AF_UNIX, SOCK_STREAM, 0);
-    if(fd == -1) {
-        error("Failed to create UNIX socket() for '%s'", path);
-        return -1;
-    }
-
-    if(timeout) {
-        if(setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (char *) timeout, sizeof(struct timeval)) < 0)
-            error("Failed to set timeout on UNIX socket '%s'", path);
-    }
-
-    struct sockaddr_un addr;
-    memset(&addr, 0, sizeof(addr));
-    addr.sun_family = AF_UNIX;
-    strncpy(addr.sun_path, path, sizeof(addr.sun_path)-1);
-
-    if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) == -1) {
-        error("Cannot connect to UNIX socket on path '%s'.", path);
-        close(fd);
-        return -1;
-    }
-
-    debug(D_CONNECT_TO, "Connected to UNIX socket on path '%s'.", path);
-
-    return fd;
-}
-
-// connect_to_this_ip46()
-// protocol    IPPROTO_TCP, IPPROTO_UDP
-// socktype    SOCK_STREAM, SOCK_DGRAM
-// host        the destination hostname or IP address (IPv4 or IPv6) to connect to
-//             if it resolves to many IPs, all are tried (IPv4 and IPv6)
-// scope_id    the if_index id of the interface to use for connecting (0 = any)
-//             (used only under IPv6)
-// service     the service name or port to connect to
-// timeout     the timeout for establishing a connection
-
-static inline int connect_to_this_ip46(int protocol, int socktype, const char *host, uint32_t scope_id, const char *service, struct timeval *timeout) {
-    struct addrinfo hints;
-    struct addrinfo *ai_head = NULL, *ai = NULL;
-
-    memset(&hints, 0, sizeof(hints));
-    hints.ai_family   = PF_UNSPEC;   /* Allow IPv4 or IPv6 */
-    hints.ai_socktype = socktype;
-    hints.ai_protocol = protocol;
-
-    int ai_err = getaddrinfo(host, service, &hints, &ai_head);
-    if (ai_err != 0) {
-        error("Cannot resolve host '%s', port '%s': %s", host, service, gai_strerror(ai_err));
-        return -1;
-    }
-
-    int fd = -1;
-    for (ai = ai_head; ai != NULL && fd == -1; ai = ai->ai_next) {
-
-        if (ai->ai_family == PF_INET6) {
-            struct sockaddr_in6 *pSadrIn6 = (struct sockaddr_in6 *) ai->ai_addr;
-            if(pSadrIn6->sin6_scope_id == 0) {
-                pSadrIn6->sin6_scope_id = scope_id;
-            }
-        }
-
-        char hostBfr[NI_MAXHOST + 1];
-        char servBfr[NI_MAXSERV + 1];
-
-        getnameinfo(ai->ai_addr,
-                    ai->ai_addrlen,
-                    hostBfr,
-                    sizeof(hostBfr),
-                    servBfr,
-                    sizeof(servBfr),
-                    NI_NUMERICHOST | NI_NUMERICSERV);
-
-        debug(D_CONNECT_TO, "Address info: host = '%s', service = '%s', ai_flags = 0x%02X, ai_family = %d (PF_INET = %d, PF_INET6 = %d), ai_socktype = %d (SOCK_STREAM = %d, SOCK_DGRAM = %d), ai_protocol = %d (IPPROTO_TCP = %d, IPPROTO_UDP = %d), ai_addrlen = %lu (sockaddr_in = %lu, sockaddr_in6 = %lu)",
-              hostBfr,
-              servBfr,
-              (unsigned int)ai->ai_flags,
-              ai->ai_family,
-              PF_INET,
-              PF_INET6,
-              ai->ai_socktype,
-              SOCK_STREAM,
-              SOCK_DGRAM,
-              ai->ai_protocol,
-              IPPROTO_TCP,
-              IPPROTO_UDP,
-              (unsigned long)ai->ai_addrlen,
-              (unsigned long)sizeof(struct sockaddr_in),
-              (unsigned long)sizeof(struct sockaddr_in6));
-
-        switch (ai->ai_addr->sa_family) {
-            case PF_INET: {
-                struct sockaddr_in *pSadrIn = (struct sockaddr_in *)ai->ai_addr;
-                debug(D_CONNECT_TO, "ai_addr = sin_family: %d (AF_INET = %d, AF_INET6 = %d), sin_addr: '%s', sin_port: '%s'",
-                      pSadrIn->sin_family,
-                      AF_INET,
-                      AF_INET6,
-                      hostBfr,
-                      servBfr);
-                break;
-            }
-
-            case PF_INET6: {
-                struct sockaddr_in6 *pSadrIn6 = (struct sockaddr_in6 *) ai->ai_addr;
-                debug(D_CONNECT_TO,"ai_addr = sin6_family: %d (AF_INET = %d, AF_INET6 = %d), sin6_addr: '%s', sin6_port: '%s', sin6_flowinfo: %u, sin6_scope_id: %u",
-                      pSadrIn6->sin6_family,
-                      AF_INET,
-                      AF_INET6,
-                      hostBfr,
-                      servBfr,
-                      pSadrIn6->sin6_flowinfo,
-                      pSadrIn6->sin6_scope_id);
-                break;
-            }
-
-            default: {
-                debug(D_CONNECT_TO, "Unknown protocol family %d.", ai->ai_family);
-                continue;
-            }
-        }
-
-        fd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
-        if(fd != -1) {
-            if(timeout) {
-                if(setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (char *) timeout, sizeof(struct timeval)) < 0)
-                    error("Failed to set timeout on the socket to ip '%s' port '%s'", hostBfr, servBfr);
-            }
-
-            errno = 0;
-            if(connect(fd, ai->ai_addr, ai->ai_addrlen) < 0) {
-                if(errno == EALREADY || errno == EINPROGRESS) {
-                    info("Waiting for connection to ip %s port %s to be established", hostBfr, servBfr);
-
-                    fd_set fds;
-                    FD_ZERO(&fds);
-                    FD_SET(0, &fds);
-                    int rc = select (1, NULL, &fds, NULL, timeout);
-
-                    if(rc > 0 && FD_ISSET(fd, &fds)) {
-                        info("connect() to ip %s port %s completed successfully", hostBfr, servBfr);
-                    }
-                    else if(rc == -1) {
-                        error("Failed to connect to '%s', port '%s'. select() returned %d", hostBfr, servBfr, rc);
-                        close(fd);
-                        fd = -1;
-                    }
-                    else {
-                        error("Timed out while connecting to '%s', port '%s'. select() returned %d", hostBfr, servBfr, rc);
-                        close(fd);
-                        fd = -1;
-                    }
-                }
-                else {
-                    error("Failed to connect to '%s', port '%s'", hostBfr, servBfr);
-                    close(fd);
-                    fd = -1;
-                }
-            }
-
-            if(fd != -1)
-                debug(D_CONNECT_TO, "Connected to '%s' on port '%s'.", hostBfr, servBfr);
-        }
-    }
-
-    freeaddrinfo(ai_head);
-
-    return fd;
-}
-
-// connect_to_this()
-//
-// definition format:
-//
-//    [PROTOCOL:]IP[%INTERFACE][:PORT]
-//
-// PROTOCOL  = tcp or udp
-// IP        = IPv4 or IPv6 IP or hostname, optionally enclosed in [] (required for IPv6)
-// INTERFACE = for IPv6 only, the network interface to use
-// PORT      = port number or service name
-
-int connect_to_this(const char *definition, int default_port, struct timeval *timeout) {
-    char buffer[strlen(definition) + 1];
-    strcpy(buffer, definition);
-
-    char default_service[10 + 1];
-    snprintfz(default_service, 10, "%d", default_port);
-
-    char *host = buffer, *service = default_service, *interface = "";
-    int protocol = IPPROTO_TCP, socktype = SOCK_STREAM;
-    uint32_t scope_id = 0;
-
-    if(strncmp(host, "tcp:", 4) == 0) {
-        host += 4;
-        protocol = IPPROTO_TCP;
-        socktype = SOCK_STREAM;
-    }
-    else if(strncmp(host, "udp:", 4) == 0) {
-        host += 4;
-        protocol = IPPROTO_UDP;
-        socktype = SOCK_DGRAM;
-    }
-    else if(strncmp(host, "unix:", 5) == 0) {
-        char *path = host + 5;
-        return connect_to_unix(path, timeout);
-    }
-
-    char *e = host;
-    if(*e == '[') {
-        e = ++host;
-        while(*e && *e != ']') e++;
-        if(*e == ']') {
-            *e = '\0';
-            e++;
-        }
-    }
-    else {
-        while(*e && *e != ':' && *e != '%') e++;
-    }
-
-    if(*e == '%') {
-        *e = '\0';
-        e++;
-        interface = e;
-        while(*e && *e != ':') e++;
-    }
-
-    if(*e == ':') {
-        *e = '\0';
-        e++;
-        service = e;
-    }
-
-    debug(D_CONNECT_TO, "Attempting connection to host = '%s', service = '%s', interface = '%s', protocol = %d (tcp = %d, udp = %d)", host, service, interface, protocol, IPPROTO_TCP, IPPROTO_UDP);
-
-    if(!*host) {
-        error("Definition '%s' does not specify a host.", definition);
-        return -1;
-    }
-
-    if(*interface) {
-        scope_id = if_nametoindex(interface);
-        if(!scope_id)
-            error("Cannot find a network interface named '%s'. Continuing with limiting the network interface", interface);
-    }
-
-    if(!*service)
-        service = default_service;
-
-
-    return connect_to_this_ip46(protocol, socktype, host, scope_id, service, timeout);
-}
-
-int connect_to_one_of(const char *destination, int default_port, struct timeval *timeout, size_t *reconnects_counter, char *connected_to, size_t connected_to_size) {
-    int sock = -1;
-
-    const char *s = destination;
-    while(*s) {
-        const char *e = s;
-
-        // skip separators, moving both s(tart) and e(nd)
-        while(isspace(*e) || *e == ',') s = ++e;
-
-        // move e(nd) to the first separator
-        while(*e && !isspace(*e) && *e != ',') e++;
-
-        // is there anything?
-        if(!*s || s == e) break;
-
-        char buf[e - s + 1];
-        strncpyz(buf, s, e - s);
-        if(reconnects_counter) *reconnects_counter += 1;
-        sock = connect_to_this(buf, default_port, timeout);
-        if(sock != -1) {
-            if(connected_to && connected_to_size) {
-                strncpy(connected_to, buf, connected_to_size);
-                connected_to[connected_to_size - 1] = '\0';
-            }
-            break;
-        }
-        s = e;
-    }
-
-    return sock;
-}
-
-
-// --------------------------------------------------------------------------------------------------------------------
-// helpers to send/receive data in one call, in blocking mode, with a timeout
-
-ssize_t recv_timeout(int sockfd, void *buf, size_t len, int flags, int timeout) {
-    for(;;) {
-        struct pollfd fd = {
-                .fd = sockfd,
-                .events = POLLIN,
-                .revents = 0
-        };
-
-        errno = 0;
-        int retval = poll(&fd, 1, timeout * 1000);
-
-        if(retval == -1) {
-            // failed
-
-            if(errno == EINTR || errno == EAGAIN)
-                continue;
-
-            return -1;
-        }
-
-        if(!retval) {
-            // timeout
-            return 0;
-        }
-
-        if(fd.events & POLLIN) break;
-    }
-
-    return recv(sockfd, buf, len, flags);
-}
-
-ssize_t send_timeout(int sockfd, void *buf, size_t len, int flags, int timeout) {
-    for(;;) {
-        struct pollfd fd = {
-                .fd = sockfd,
-                .events = POLLOUT,
-                .revents = 0
-        };
-
-        errno = 0;
-        int retval = poll(&fd, 1, timeout * 1000);
-
-        if(retval == -1) {
-            // failed
-
-            if(errno == EINTR || errno == EAGAIN)
-                continue;
-
-            return -1;
-        }
-
-        if(!retval) {
-            // timeout
-            return 0;
-        }
-
-        if(fd.events & POLLOUT) break;
-    }
-
-    return send(sockfd, buf, len, flags);
-}
-
-
-// --------------------------------------------------------------------------------------------------------------------
-// accept4() replacement for systems that do not have one
-
-#ifndef HAVE_ACCEPT4
-int accept4(int sock, struct sockaddr *addr, socklen_t *addrlen, int flags) {
-    int fd = accept(sock, addr, addrlen);
-    int newflags = 0;
-
-    if (fd < 0) return fd;
-
-    if (flags & SOCK_NONBLOCK) {
-        newflags |= O_NONBLOCK;
-        flags &= ~SOCK_NONBLOCK;
-    }
-
-#ifdef SOCK_CLOEXEC
-#ifdef O_CLOEXEC
-    if (flags & SOCK_CLOEXEC) {
-        newflags |= O_CLOEXEC;
-        flags &= ~SOCK_CLOEXEC;
-    }
-#endif
-#endif
-
-    if (flags) {
-        close(fd);
-        errno = EINVAL;
-        return -1;
-    }
-
-    if (fcntl(fd, F_SETFL, newflags) < 0) {
-        int saved_errno = errno;
-        close(fd);
-        errno = saved_errno;
-        return -1;
-    }
-
-    return fd;
-}
-#endif
-
-
-// --------------------------------------------------------------------------------------------------------------------
-// accept_socket() - accept a socket and store client IP and port
-
-int accept_socket(int fd, int flags, char *client_ip, size_t ipsize, char *client_port, size_t portsize, SIMPLE_PATTERN *access_list) {
-    struct sockaddr_storage sadr;
-    socklen_t addrlen = sizeof(sadr);
-
-    int nfd = accept4(fd, (struct sockaddr *)&sadr, &addrlen, flags);
-    if (likely(nfd >= 0)) {
-        if (getnameinfo((struct sockaddr *)&sadr, addrlen, client_ip, (socklen_t)ipsize, client_port, (socklen_t)portsize, NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
-            error("LISTENER: cannot getnameinfo() on received client connection.");
-            strncpyz(client_ip, "UNKNOWN", ipsize - 1);
-            strncpyz(client_port, "UNKNOWN", portsize - 1);
-        }
-
-        client_ip[ipsize - 1] = '\0';
-        client_port[portsize - 1] = '\0';
-
-        switch (((struct sockaddr *)&sadr)->sa_family) {
-            case AF_UNIX:
-                debug(D_LISTENER, "New UNIX domain web client from %s on socket %d.", client_ip, fd);
-                // set the port - certain versions of libc return garbage on unix sockets
-                strncpy(client_port, "UNIX", portsize);
-                client_port[portsize - 1] = '\0';
-                break;
-
-            case AF_INET:
-                debug(D_LISTENER, "New IPv4 web client from %s port %s on socket %d.", client_ip, client_port, fd);
-                break;
-
-            case AF_INET6:
-                if (strncmp(client_ip, "::ffff:", 7) == 0) {
-                    memmove(client_ip, &client_ip[7], strlen(&client_ip[7]) + 1);
-                    debug(D_LISTENER, "New IPv4 web client from %s port %s on socket %d.", client_ip, client_port, fd);
-                }
-                else
-                    debug(D_LISTENER, "New IPv6 web client from %s port %s on socket %d.", client_ip, client_port, fd);
-                break;
-
-            default:
-                debug(D_LISTENER, "New UNKNOWN web client from %s port %s on socket %d.", client_ip, client_port, fd);
-                break;
-        }
-
-        if(access_list) {
-            if(!strcmp(client_ip, "127.0.0.1") || !strcmp(client_ip, "::1")) {
-                strncpy(client_ip, "localhost", ipsize);
-                client_ip[ipsize - 1] = '\0';
-            }
-
-            if(unlikely(!simple_pattern_matches(access_list, client_ip))) {
-                errno = 0;
-                debug(D_LISTENER, "Permission denied for client '%s', port '%s'", client_ip, client_port);
-                error("DENIED ACCESS to client '%s'", client_ip);
-                close(nfd);
-                nfd = -1;
-                errno = EPERM;
-            }
-        }
-    }
-#ifdef HAVE_ACCEPT4
-    else if(errno == ENOSYS)
-        error("netdata has been compiled with the assumption that the system has the accept4() call, but it is not here. Recompile netdata like this: ./configure --disable-accept4 ...");
-#endif
-
-    return nfd;
-}
-
-
-// --------------------------------------------------------------------------------------------------------------------
-// poll() based listener
-// this should be the fastest possible listener for up to 100 sockets
-// above 100, an epoll() interface is needed on Linux
-
-#define POLL_FDS_INCREASE_STEP 10
-
-inline POLLINFO *poll_add_fd(POLLJOB *p
-                             , int fd
-                             , int socktype
-                             , uint32_t flags
-                             , const char *client_ip
-                             , const char *client_port
-                             , void *(*add_callback)(POLLINFO *pi, short int *events, void *data)
-                             , void  (*del_callback)(POLLINFO *pi)
-                             , int   (*rcv_callback)(POLLINFO *pi, short int *events)
-                             , int   (*snd_callback)(POLLINFO *pi, short int *events)
-                             , void *data
-) {
-    debug(D_POLLFD, "POLLFD: ADD: request to add fd %d, slots = %zu, used = %zu, min = %zu, max = %zu, next free = %zd", fd, p->slots, p->used, p->min, p->max, p->first_free?(ssize_t)p->first_free->slot:(ssize_t)-1);
-
-    if(unlikely(fd < 0)) return NULL;
-
-    //if(p->limit && p->used >= p->limit) {
-    //    info("Max sockets limit reached (%zu sockets), dropping connection", p->used);
-    //    close(fd);
-    //    return NULL;
-    //}
-
-    if(unlikely(!p->first_free)) {
-        size_t new_slots = p->slots + POLL_FDS_INCREASE_STEP;
-        debug(D_POLLFD, "POLLFD: ADD: increasing size (current = %zu, new = %zu, used = %zu, min = %zu, max = %zu)", p->slots, new_slots, p->used, p->min, p->max);
-
-        p->fds = reallocz(p->fds, sizeof(struct pollfd) * new_slots);
-        p->inf = reallocz(p->inf, sizeof(POLLINFO) * new_slots);
-
-        // reset all the newly added slots
-        ssize_t i;
-        for(i = new_slots - 1; i >= (ssize_t)p->slots ; i--) {
-            debug(D_POLLFD, "POLLFD: ADD: resetting new slot %zd", i);
-            p->fds[i].fd = -1;
-            p->fds[i].events = 0;
-            p->fds[i].revents = 0;
-
-            p->inf[i].p = p;
-            p->inf[i].slot = (size_t)i;
-            p->inf[i].flags = 0;
-            p->inf[i].socktype = -1;
-            p->inf[i].client_ip = NULL;
-            p->inf[i].client_port = NULL;
-            p->inf[i].del_callback = p->del_callback;
-            p->inf[i].rcv_callback = p->rcv_callback;
-            p->inf[i].snd_callback = p->snd_callback;
-            p->inf[i].data = NULL;
-
-            // link them so that the first free will be earlier in the array
-            // (we loop decrementing i)
-            p->inf[i].next = p->first_free;
-            p->first_free = &p->inf[i];
-        }
-
-        p->slots = new_slots;
-    }
-
-    POLLINFO *pi = p->first_free;
-    p->first_free = p->first_free->next;
-
-    debug(D_POLLFD, "POLLFD: ADD: selected slot %zu, next free is %zd", pi->slot, p->first_free?(ssize_t)p->first_free->slot:(ssize_t)-1);
-
-    struct pollfd *pf = &p->fds[pi->slot];
-    pf->fd = fd;
-    pf->events = POLLIN;
-    pf->revents = 0;
-
-    pi->fd = fd;
-    pi->p = p;
-    pi->socktype = socktype;
-    pi->flags = flags;
-    pi->next = NULL;
-    pi->client_ip = strdupz(client_ip);
-    pi->client_port = strdupz(client_port);
-
-    pi->del_callback = del_callback;
-    pi->rcv_callback = rcv_callback;
-    pi->snd_callback = snd_callback;
-
-    pi->connected_t = now_boottime_sec();
-    pi->last_received_t = 0;
-    pi->last_sent_t = 0;
-    pi->last_sent_t = 0;
-    pi->recv_count = 0;
-    pi->send_count = 0;
-
-    netdata_thread_disable_cancelability();
-    p->used++;
-    if(unlikely(pi->slot > p->max))
-        p->max = pi->slot;
-
-    if(pi->flags & POLLINFO_FLAG_CLIENT_SOCKET) {
-        pi->data = add_callback(pi, &pf->events, data);
-    }
-
-    if(pi->flags & POLLINFO_FLAG_SERVER_SOCKET) {
-        p->min = pi->slot;
-    }
-    netdata_thread_enable_cancelability();
-
-    debug(D_POLLFD, "POLLFD: ADD: completed, slots = %zu, used = %zu, min = %zu, max = %zu, next free = %zd", p->slots, p->used, p->min, p->max, p->first_free?(ssize_t)p->first_free->slot:(ssize_t)-1);
-
-    return pi;
-}
-
-inline void poll_close_fd(POLLINFO *pi) {
-    POLLJOB *p = pi->p;
-
-    struct pollfd *pf = &p->fds[pi->slot];
-    debug(D_POLLFD, "POLLFD: DEL: request to clear slot %zu (fd %d), old next free was %zd", pi->slot, pf->fd, p->first_free?(ssize_t)p->first_free->slot:(ssize_t)-1);
-
-    if(unlikely(pf->fd == -1)) return;
-
-    netdata_thread_disable_cancelability();
-
-    if(pi->flags & POLLINFO_FLAG_CLIENT_SOCKET) {
-        pi->del_callback(pi);
-
-        if(likely(!(pi->flags & POLLINFO_FLAG_DONT_CLOSE))) {
-            if(close(pf->fd) == -1)
-                error("Failed to close() poll_events() socket %d", pf->fd);
-        }
-    }
-
-    pf->fd = -1;
-    pf->events = 0;
-    pf->revents = 0;
-
-    pi->fd = -1;
-    pi->socktype = -1;
-    pi->flags = 0;
-    pi->data = NULL;
-
-    pi->del_callback = NULL;
-    pi->rcv_callback = NULL;
-    pi->snd_callback = NULL;
-
-    freez(pi->client_ip);
-    pi->client_ip = NULL;
-
-    freez(pi->client_port);
-    pi->client_port = NULL;
-
-    pi->next = p->first_free;
-    p->first_free = pi;
-
-    p->used--;
-    if(unlikely(p->max == pi->slot)) {
-        p->max = p->min;
-        ssize_t i;
-        for(i = (ssize_t)pi->slot; i > (ssize_t)p->min ;i--) {
-            if (unlikely(p->fds[i].fd != -1)) {
-                p->max = (size_t)i;
-                break;
-            }
-        }
-    }
-    netdata_thread_enable_cancelability();
-
-    debug(D_POLLFD, "POLLFD: DEL: completed, slots = %zu, used = %zu, min = %zu, max = %zu, next free = %zd", p->slots, p->used, p->min, p->max, p->first_free?(ssize_t)p->first_free->slot:(ssize_t)-1);
-}
-
-void *poll_default_add_callback(POLLINFO *pi, short int *events, void *data) {
-    (void)pi;
-    (void)events;
-    (void)data;
-
-    // error("POLLFD: internal error: poll_default_add_callback() called");
-
-    return NULL;
-}
-
-void poll_default_del_callback(POLLINFO *pi) {
-    if(pi->data)
-        error("POLLFD: internal error: del_callback_default() called with data pointer - possible memory leak");
-}
-
-int poll_default_rcv_callback(POLLINFO *pi, short int *events) {
-    *events |= POLLIN;
-
-    char buffer[1024 + 1];
-
-    ssize_t rc;
-    do {
-        rc = recv(pi->fd, buffer, 1024, MSG_DONTWAIT);
-        if (rc < 0) {
-            // read failed
-            if (errno != EWOULDBLOCK && errno != EAGAIN) {
-                error("POLLFD: poll_default_rcv_callback(): recv() failed with %zd.", rc);
-                return -1;
-            }
-        } else if (rc) {
-            // data received
-            info("POLLFD: internal error: poll_default_rcv_callback() is discarding %zd bytes received on socket %d", rc, pi->fd);
-        }
-    } while (rc != -1);
-
-    return 0;
-}
-
-int poll_default_snd_callback(POLLINFO *pi, short int *events) {
-    *events &= ~POLLOUT;
-
-    info("POLLFD: internal error: poll_default_snd_callback(): nothing to send on socket %d", pi->fd);
-    return 0;
-}
-
-void poll_default_tmr_callback(void *timer_data) {
-    (void)timer_data;
-}
-
-static void poll_events_cleanup(void *data) {
-    POLLJOB *p = (POLLJOB *)data;
-
-    size_t i;
-    for(i = 0 ; i <= p->max ; i++) {
-        POLLINFO *pi = &p->inf[i];
-        poll_close_fd(pi);
-    }
-
-    freez(p->fds);
-    freez(p->inf);
-}
-
-static void poll_events_process(POLLJOB *p, POLLINFO *pi, struct pollfd *pf, short int revents, time_t now) {
-    short int events = pf->events;
-    int fd = pf->fd;
-    pf->revents = 0;
-    size_t i = pi->slot;
-
-    if(unlikely(fd == -1)) {
-        debug(D_POLLFD, "POLLFD: LISTENER: ignoring slot %zu, it does not have an fd", i);
-        return;
-    }
-
-    debug(D_POLLFD, "POLLFD: LISTENER: processing events for slot %zu (events = %d, revents = %d)", i, events, revents);
-
-    if(revents & POLLIN || revents & POLLPRI) {
-        // receiving data
-
-        pi->last_received_t = now;
-        pi->recv_count++;
-
-        if(likely(pi->flags & POLLINFO_FLAG_CLIENT_SOCKET)) {
-            // read data from client TCP socket
-            debug(D_POLLFD, "POLLFD: LISTENER: reading data from TCP client slot %zu (fd %d)", i, fd);
-
-            pf->events = 0;
-            if (pi->rcv_callback(pi, &pf->events) == -1) {
-                poll_close_fd(&p->inf[i]);
-                return;
-            }
-            pf = &p->fds[i];
-            pi = &p->inf[i];
-
-#ifdef NETDATA_INTERNAL_CHECKS
-            // this is common - it is used for web server file copies
-            if(unlikely(!(pf->events & (POLLIN|POLLOUT)))) {
-                error("POLLFD: LISTENER: after reading, client slot %zu (fd %d) from '%s:%s' was left without expecting input or output. ", i, fd, pi->client_ip?pi->client_ip:"<undefined-ip>", pi->client_port?pi->client_port:"<undefined-port>");
-                //poll_close_fd(pi);
-                //return;
-            }
-#endif
-        }
-        else if(likely(pi->flags & POLLINFO_FLAG_SERVER_SOCKET)) {
-            // new connection
-            // debug(D_POLLFD, "POLLFD: LISTENER: accepting connections from slot %zu (fd %d)", i, fd);
-
-            switch(pi->socktype) {
-                case SOCK_STREAM: {
-                    // a TCP socket
-                    // we accept the connection
-
-                    int nfd;
-                    do {
-                        char client_ip[NI_MAXHOST + 1];
-                        char client_port[NI_MAXSERV + 1];
-
-                        debug(D_POLLFD, "POLLFD: LISTENER: calling accept4() slot %zu (fd %d)", i, fd);
-                        nfd = accept_socket(fd, SOCK_NONBLOCK, client_ip, NI_MAXHOST + 1, client_port, NI_MAXSERV + 1, p->access_list);
-                        if (unlikely(nfd < 0)) {
-                            // accept failed
-
-                            debug(D_POLLFD, "POLLFD: LISTENER: accept4() slot %zu (fd %d) failed.", i, fd);
-
-                            if(unlikely(errno == EMFILE)) {
-                                error("POLLFD: LISTENER: too many open files - sleeping for 1ms - used by this thread %zu, max for this thread %zu", p->used, p->limit);
-                                usleep(1000); // 10ms
-                            }
-                            else if(unlikely(errno != EWOULDBLOCK && errno != EAGAIN))
-                                error("POLLFD: LISTENER: accept() failed.");
-
-                            break;
-                        }
-                        else {
-                            // accept ok
-                            // info("POLLFD: LISTENER: client '[%s]:%s' connected to '%s' on fd %d", client_ip, client_port, sockets->fds_names[i], nfd);
-                            poll_add_fd(p
-                                        , nfd
-                                        , SOCK_STREAM
-                                        , POLLINFO_FLAG_CLIENT_SOCKET
-                                        , client_ip
-                                        , client_port
-                                        , p->add_callback
-                                        , p->del_callback
-                                        , p->rcv_callback
-                                        , p->snd_callback
-                                        , NULL
-                            );
-
-                            // it may have reallocated them, so refresh our pointers
-                            pf = &p->fds[i];
-                            pi = &p->inf[i];
-                        }
-                    } while (nfd >= 0 && (!p->limit || p->used < p->limit));
-                    break;
-                }
-
-                case SOCK_DGRAM: {
-                    // a UDP socket
-                    // we read data from the server socket
-
-                    debug(D_POLLFD, "POLLFD: LISTENER: reading data from UDP slot %zu (fd %d)", i, fd);
-
-                    // FIXME: access_list is not applied to UDP
-
-                    pf->events = 0;
-                    pi->rcv_callback(pi, &pf->events);
-                    break;
-                }
-
-                default: {
-                    error("POLLFD: LISTENER: Unknown socktype %d on slot %zu", pi->socktype, pi->slot);
-                    break;
-                }
-            }
-        }
-    }
-
-    if(unlikely(revents & POLLOUT)) {
-        // sending data
-        debug(D_POLLFD, "POLLFD: LISTENER: sending data to socket on slot %zu (fd %d)", i, fd);
-
-        pi->last_sent_t = now;
-        pi->send_count++;
-
-        pf->events = 0;
-        if (pi->snd_callback(pi, &pf->events) == -1) {
-            poll_close_fd(&p->inf[i]);
-            return;
-        }
-        pf = &p->fds[i];
-        pi = &p->inf[i];
-
-#ifdef NETDATA_INTERNAL_CHECKS
-        // this is common - it is used for streaming
-        if(unlikely(pi->flags & POLLINFO_FLAG_CLIENT_SOCKET && !(pf->events & (POLLIN|POLLOUT)))) {
-            error("POLLFD: LISTENER: after sending, client slot %zu (fd %d) from '%s:%s' was left without expecting input or output. ", i, fd, pi->client_ip?pi->client_ip:"<undefined-ip>", pi->client_port?pi->client_port:"<undefined-port>");
-            //poll_close_fd(pi);
-            //return;
-        }
-#endif
-    }
-
-    if(unlikely(revents & POLLERR)) {
-        error("POLLFD: LISTENER: processing POLLERR events for slot %zu fd %d (events = %d, revents = %d)", i, events, revents, fd);
-        pf->events = 0;
-        poll_close_fd(pi);
-        return;
-    }
-
-    if(unlikely(revents & POLLHUP)) {
-        error("POLLFD: LISTENER: processing POLLHUP events for slot %zu fd %d (events = %d, revents = %d)", i, events, revents, fd);
-        pf->events = 0;
-        poll_close_fd(pi);
-        return;
-    }
-
-    if(unlikely(revents & POLLNVAL)) {
-        error("POLLFD: LISTENER: processing POLLNVAL events for slot %zu fd %d (events = %d, revents = %d)", i, events, revents, fd);
-        pf->events = 0;
-        poll_close_fd(pi);
-        return;
-    }
-}
-
-void poll_events(LISTEN_SOCKETS *sockets
-        , void *(*add_callback)(POLLINFO *pi, short int *events, void *data)
-        , void  (*del_callback)(POLLINFO *pi)
-        , int   (*rcv_callback)(POLLINFO *pi, short int *events)
-        , int   (*snd_callback)(POLLINFO *pi, short int *events)
-        , void  (*tmr_callback)(void *timer_data)
-        , SIMPLE_PATTERN *access_list
-        , void *data
-        , time_t tcp_request_timeout_seconds
-        , time_t tcp_idle_timeout_seconds
-        , time_t timer_milliseconds
-        , void *timer_data
-        , size_t max_tcp_sockets
-) {
-    if(!sockets || !sockets->opened) {
-        error("POLLFD: internal error: no listening sockets are opened");
-        return;
-    }
-
-    if(timer_milliseconds <= 0) timer_milliseconds = 0;
-
-    int retval;
-
-    POLLJOB p = {
-            .slots = 0,
-            .used = 0,
-            .max = 0,
-            .limit = max_tcp_sockets,
-            .fds = NULL,
-            .inf = NULL,
-            .first_free = NULL,
-
-            .complete_request_timeout = tcp_request_timeout_seconds,
-            .idle_timeout = tcp_idle_timeout_seconds,
-            .checks_every = (tcp_idle_timeout_seconds / 3) + 1,
-
-            .access_list = access_list,
-
-            .timer_milliseconds = timer_milliseconds,
-            .timer_data = timer_data,
-
-            .add_callback = add_callback?add_callback:poll_default_add_callback,
-            .del_callback = del_callback?del_callback:poll_default_del_callback,
-            .rcv_callback = rcv_callback?rcv_callback:poll_default_rcv_callback,
-            .snd_callback = snd_callback?snd_callback:poll_default_snd_callback,
-            .tmr_callback = tmr_callback?tmr_callback:poll_default_tmr_callback
-    };
-
-    size_t i;
-    for(i = 0; i < sockets->opened ;i++) {
-
-        POLLINFO *pi = poll_add_fd(&p
-                                   , sockets->fds[i]
-                                   , sockets->fds_types[i]
-                                   , POLLINFO_FLAG_SERVER_SOCKET
-                                   , (sockets->fds_names[i])?sockets->fds_names[i]:"UNKNOWN"
-                                   , ""
-                                   , p.add_callback
-                                   , p.del_callback
-                                   , p.rcv_callback
-                                   , p.snd_callback
-                                   , NULL
-        );
-
-        pi->data = data;
-        info("POLLFD: LISTENER: listening on '%s'", (sockets->fds_names[i])?sockets->fds_names[i]:"UNKNOWN");
-    }
-
-    int listen_sockets_active = 1;
-
-    int timeout_ms = 1000; // in milliseconds
-    time_t last_check = now_boottime_sec();
-
-    usec_t timer_usec = timer_milliseconds * USEC_PER_MS;
-    usec_t now_usec = 0, next_timer_usec = 0, last_timer_usec = 0;
-    if(unlikely(timer_usec)) {
-        now_usec = now_boottime_usec();
-        next_timer_usec = now_usec - (now_usec % timer_usec) + timer_usec;
-    }
-
-    netdata_thread_cleanup_push(poll_events_cleanup, &p);
-
-    while(!netdata_exit) {
-        if(unlikely(timer_usec)) {
-            now_usec = now_boottime_usec();
-
-            if(unlikely(timer_usec && now_usec >= next_timer_usec)) {
-                debug(D_POLLFD, "Calling timer callback after %zu usec", (size_t)(now_usec - last_timer_usec));
-                last_timer_usec = now_usec;
-                p.tmr_callback(p.timer_data);
-                now_usec = now_boottime_usec();
-                next_timer_usec = now_usec - (now_usec % timer_usec) + timer_usec;
-            }
-
-            usec_t dt_usec = next_timer_usec - now_usec;
-            if(dt_usec > 1000 * USEC_PER_MS)
-                timeout_ms = 1000;
-            else
-                timeout_ms = (int)(dt_usec / USEC_PER_MS);
-        }
-
-        // enable or disable the TCP listening sockets, based on the current number of sockets used and the limit set
-        if((listen_sockets_active && (p.limit && p.used >= p.limit)) || (!listen_sockets_active && (!p.limit || p.used < p.limit))) {
-            listen_sockets_active = !listen_sockets_active;
-            info("%s listening sockets (used TCP sockets %zu, max allowed for this worker %zu)", (listen_sockets_active)?"ENABLING":"DISABLING", p.used, p.limit);
-            for (i = 0; i <= p.max; i++) {
-                if(p.inf[i].flags & POLLINFO_FLAG_SERVER_SOCKET && p.inf[i].socktype == SOCK_STREAM) {
-                    p.fds[i].events = (short int) ((listen_sockets_active) ? POLLIN : 0);
-                }
-            }
-        }
-
-        debug(D_POLLFD, "POLLFD: LISTENER: Waiting on %zu sockets for %zu ms...", p.max + 1, (size_t)timeout_ms);
-        retval = poll(p.fds, p.max + 1, timeout_ms);
-        time_t now = now_boottime_sec();
-
-        if(unlikely(retval == -1)) {
-            error("POLLFD: LISTENER: poll() failed while waiting on %zu sockets.", p.max + 1);
-            break;
-        }
-        else if(unlikely(!retval)) {
-            debug(D_POLLFD, "POLLFD: LISTENER: poll() timeout.");
-        }
-        else {
-            for (i = 0; i <= p.max; i++) {
-                struct pollfd *pf     = &p.fds[i];
-                short int     revents = pf->revents;
-                if (unlikely(revents))
-                    poll_events_process(&p, &p.inf[i], pf, revents, now);
-            }
-        }
-
-        if(unlikely(p.checks_every > 0 && now - last_check > p.checks_every)) {
-            last_check = now;
-
-            // security checks
-            for(i = 0; i <= p.max; i++) {
-                POLLINFO *pi = &p.inf[i];
-
-                if(likely(pi->flags & POLLINFO_FLAG_CLIENT_SOCKET)) {
-                    if (unlikely(pi->send_count == 0 && p.complete_request_timeout > 0 && (now - pi->connected_t) >= p.complete_request_timeout)) {
-                        info("POLLFD: LISTENER: client slot %zu (fd %d) from '%s:%s' has not sent a complete request in %zu seconds - closing it. "
-                              , i
-                              , pi->fd
-                              , pi->client_ip ? pi->client_ip : "<undefined-ip>"
-                              , pi->client_port ? pi->client_port : "<undefined-port>"
-                              , (size_t) p.complete_request_timeout
-                        );
-                        poll_close_fd(pi);
-                    }
-                    else if(unlikely(pi->recv_count && p.idle_timeout > 0 && now - ((pi->last_received_t > pi->last_sent_t) ? pi->last_received_t : pi->last_sent_t) >= p.idle_timeout )) {
-                        info("POLLFD: LISTENER: client slot %zu (fd %d) from '%s:%s' is idle for more than %zu seconds - closing it. "
-                              , i
-                              , pi->fd
-                              , pi->client_ip ? pi->client_ip : "<undefined-ip>"
-                              , pi->client_port ? pi->client_port : "<undefined-port>"
-                              , (size_t) p.idle_timeout
-                        );
-                        poll_close_fd(pi);
-                    }
-                }
-            }
-        }
-    }
-
-    netdata_thread_cleanup_pop(1);
-    debug(D_POLLFD, "POLLFD: LISTENER: cleanup completed");
-}