diff options
Diffstat (limited to 'src/libnetdata/socket.c')
| -rw-r--r-- | src/libnetdata/socket.c | 1526 |
1 files changed, 0 insertions, 1526 deletions
diff --git a/src/libnetdata/socket.c b/src/libnetdata/socket.c deleted file mode 100644 index b08528467a..0000000000 --- a/src/libnetdata/socket.c +++ /dev/null @@ -1,1526 +0,0 @@ -// SPDX-License-Identifier: GPL-3.0-or-later - -#include "libnetdata.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; - -#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); -#else - ret = -1; -#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, uint16_t 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, uint16_t 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, uint16_t 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, uint16_t 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; - - char rip[INET_ADDRSTRLEN + INET6_ADDRSTRLEN] = "INVALID"; - uint16_t 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); - - long long int old_port = sockets->default_port; - long long int new_port = config_get_number(sockets->config_section, "default port", sockets->default_port); - if(new_port < 1 || new_port > 65535) { - error("LISTENER: Invalid listen port %lld given. Defaulting to %lld.", new_port, old_port); - sockets->default_port = (uint16_t) config_set_number(sockets->config_section, "default port", old_port); - } - else sockets->default_port = (uint16_t)new_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->sn |