diff options
Diffstat (limited to '')
-rw-r--r-- | src/libnetdata/socket/socket.c | 2179 |
1 files changed, 2179 insertions, 0 deletions
diff --git a/src/libnetdata/socket/socket.c b/src/libnetdata/socket/socket.c new file mode 100644 index 000000000..0ba24b747 --- /dev/null +++ b/src/libnetdata/socket/socket.c @@ -0,0 +1,2179 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#ifndef _GNU_SOURCE +#define _GNU_SOURCE // for POLLRDHUP +#endif + +#ifndef __BSD_VISIBLE +#define __BSD_VISIBLE // for POLLRDHUP +#endif + +#include "../libnetdata.h" + +bool ip_to_hostname(const char *ip, char *dst, size_t dst_len) { + if(!dst || !dst_len) + return false; + + struct sockaddr_in sa; + struct sockaddr_in6 sa6; + struct sockaddr *sa_ptr; + int sa_len; + + // Try to convert the IP address to sockaddr_in (IPv4) + if (inet_pton(AF_INET, ip, &(sa.sin_addr)) == 1) { + sa.sin_family = AF_INET; + sa_ptr = (struct sockaddr *)&sa; + sa_len = sizeof(sa); + } + // Try to convert the IP address to sockaddr_in6 (IPv6) + else if (inet_pton(AF_INET6, ip, &(sa6.sin6_addr)) == 1) { + sa6.sin6_family = AF_INET6; + sa_ptr = (struct sockaddr *)&sa6; + sa_len = sizeof(sa6); + } + + else { + dst[0] = '\0'; + return false; + } + + // Perform the reverse lookup + int res = getnameinfo(sa_ptr, sa_len, dst, dst_len, NULL, 0, NI_NAMEREQD); + if(res != 0) + return false; + + return true; +} + +SOCKET_PEERS socket_peers(int sock_fd) { + SOCKET_PEERS peers; + + if(sock_fd < 0) { + strncpyz(peers.peer.ip, "not connected", sizeof(peers.peer.ip) - 1); + peers.peer.port = 0; + + strncpyz(peers.local.ip, "not connected", sizeof(peers.local.ip) - 1); + peers.local.port = 0; + + return peers; + } + + struct sockaddr_storage addr; + socklen_t addr_len = sizeof(addr); + + // Get peer info + if (getpeername(sock_fd, (struct sockaddr *)&addr, &addr_len) == 0) { + if (addr.ss_family == AF_INET) { // IPv4 + struct sockaddr_in *s = (struct sockaddr_in *)&addr; + inet_ntop(AF_INET, &s->sin_addr, peers.peer.ip, sizeof(peers.peer.ip)); + peers.peer.port = ntohs(s->sin_port); + } + else { // IPv6 + struct sockaddr_in6 *s = (struct sockaddr_in6 *)&addr; + inet_ntop(AF_INET6, &s->sin6_addr, peers.peer.ip, sizeof(peers.peer.ip)); + peers.peer.port = ntohs(s->sin6_port); + } + } + else { + strncpyz(peers.peer.ip, "unknown", sizeof(peers.peer.ip) - 1); + peers.peer.port = 0; + } + + // Get local info + addr_len = sizeof(addr); + if (getsockname(sock_fd, (struct sockaddr *)&addr, &addr_len) == 0) { + if (addr.ss_family == AF_INET) { // IPv4 + struct sockaddr_in *s = (struct sockaddr_in *) &addr; + inet_ntop(AF_INET, &s->sin_addr, peers.local.ip, sizeof(peers.local.ip)); + peers.local.port = ntohs(s->sin_port); + } else { // IPv6 + struct sockaddr_in6 *s = (struct sockaddr_in6 *) &addr; + inet_ntop(AF_INET6, &s->sin6_addr, peers.local.ip, sizeof(peers.local.ip)); + peers.local.port = ntohs(s->sin6_port); + } + } + else { + strncpyz(peers.local.ip, "unknown", sizeof(peers.local.ip) - 1); + peers.local.port = 0; + } + + return peers; +} + + +// -------------------------------------------------------------------------------------------------------------------- +// 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 + +bool fd_is_socket(int fd) { + int type; + socklen_t len = sizeof(type); + if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &len) == -1) + return false; + + return true; +} + +bool sock_has_output_error(int fd) { + if(fd < 0) { + //internal_error(true, "invalid socket %d", fd); + return false; + } + +// if(!fd_is_socket(fd)) { +// //internal_error(true, "fd %d is not a socket", fd); +// return false; +// } + + short int errors = POLLERR | POLLHUP | POLLNVAL; + +#ifdef POLLRDHUP + errors |= POLLRDHUP; +#endif + + struct pollfd pfd = { + .fd = fd, + .events = POLLOUT | errors, + .revents = 0, + }; + + if(poll(&pfd, 1, 0) == -1) { + //internal_error(true, "poll() failed"); + return false; + } + + return ((pfd.revents & errors) || !(pfd.revents & POLLOUT)); +} + +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) + nd_log(NDLS_DAEMON, NDLP_ERR, + "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) + nd_log(NDLS_DAEMON, NDLP_ERR, + "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) + nd_log(NDLS_DAEMON, NDLP_ERR, + "Failed to set SO_REUSEADDR on socket %d", + fd); + + return ret; +} + +void sock_setcloexec(int fd) +{ + UNUSED(fd); +#ifndef SOCK_CLOEXEC + int flags = fcntl(fd, F_GETFD); + if (flags != -1) + (void) fcntl(fd, F_SETFD, flags | FD_CLOEXEC); +#endif +} + +int sock_setreuse_port(int fd __maybe_unused, int reuse __maybe_unused) { + int ret; + +#ifdef SO_REUSEPORT + ret = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &reuse, sizeof(reuse)); + if(ret == -1 && errno != ENOPROTOOPT) + nd_log(NDLS_DAEMON, NDLP_ERR, + "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) + nd_log(NDLS_DAEMON, NDLP_ERR, + "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) + nd_log(NDLS_DAEMON, NDLP_ERR, + "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, sizeof(buffer) - 1, "%s:%s:%d", protocol, ip, port); + break; + + case AF_INET6: + default: + snprintfz(buffer, sizeof(buffer) - 1, "%s:[%s]:%d", protocol, ip, port); + break; + + case AF_UNIX: + snprintfz(buffer, sizeof(buffer) - 1, "%s:%s", protocol, ip); + break; + } + + return strdupz(buffer); +} + +// -------------------------------------------------------------------------------------------------------------------- +// listening sockets + +int create_listen_socket_unix(const char *path, int listen_backlog) { + int sock; + + sock = socket(AF_UNIX, SOCK_STREAM | DEFAULT_SOCKET_FLAGS, 0); + if(sock < 0) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: UNIX socket() on path '%s' failed.", + path); + + return -1; + } + + sock_setnonblock(sock); + sock_setcloexec(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) + nd_log(NDLS_DAEMON, NDLP_ERR, + "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); + nd_log(NDLS_DAEMON, NDLP_ERR, + "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) + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: failed to chmod() socket file '%s'.", + path); + + if(listen(sock, listen_backlog) < 0) { + close(sock); + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: UNIX listen() on path '%s' failed.", + path); + + return -1; + } + + return sock; +} + +int create_listen_socket4(int socktype, const char *ip, uint16_t port, int listen_backlog) { + int sock; + + sock = socket(AF_INET, socktype | DEFAULT_SOCKET_FLAGS, 0); + if(sock < 0) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: IPv4 socket() on ip '%s' port %d, socktype %d failed.", + ip, port, socktype); + + return -1; + } + sock_setreuse(sock, 1); + sock_setreuse_port(sock, 0); + sock_setnonblock(sock); + sock_setcloexec(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) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "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); + nd_log(NDLS_DAEMON, NDLP_ERR, + "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); + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: IPv4 listen() on ip '%s' port %d, socktype %d failed.", + ip, port, socktype); + + return -1; + } + + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "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; + + sock = socket(AF_INET6, socktype | DEFAULT_SOCKET_FLAGS, 0); + if (sock < 0) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: IPv6 socket() on ip '%s' port %d, socktype %d, failed.", + ip, port, socktype); + + return -1; + } + sock_setreuse(sock, 1); + sock_setreuse_port(sock, 0); + sock_setnonblock(sock); + sock_setcloexec(sock); + sock_enlarge_in(sock); + + /* IPv6 only */ + if(setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&ipv6only, sizeof(ipv6only)) != 0) + nd_log(NDLS_DAEMON, NDLP_ERR, + "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) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "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); + nd_log(NDLS_DAEMON, NDLP_ERR, + "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); + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: IPv6 listen() on ip '%s' port %d, socktype %d failed.", + ip, port, socktype); + + return -1; + } + + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "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, int acl_flags) { + if(sockets->opened >= MAX_LISTEN_FDS) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "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->fds_acl_flags[sockets->opened] = acl_flags; + + 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; +} + +/* + * SSL ACL + * + * Search the SSL acl and apply it case it is set. + * + * @param acl is the acl given by the user. + */ +HTTP_ACL socket_ssl_acl(char *acl) { + char *ssl = strchr(acl,'^'); + if(ssl) { + //Due the format of the SSL command it is always the last command, + //we finish it here to avoid problems with the ACLs + *ssl = '\0'; +#ifdef ENABLE_HTTPS + ssl++; + if (!strncmp("SSL=",ssl,4)) { + ssl += 4; + if (!strcmp(ssl,"optional")) { + return HTTP_ACL_SSL_OPTIONAL; + } + else if (!strcmp(ssl,"force")) { + return HTTP_ACL_SSL_FORCE; + } + } +#endif + } + + return HTTP_ACL_NONE; +} + +HTTP_ACL read_acl(char *st) { + HTTP_ACL ret = socket_ssl_acl(st); + + if (!strcmp(st,"dashboard")) ret |= HTTP_ACL_DASHBOARD; + if (!strcmp(st,"registry")) ret |= HTTP_ACL_REGISTRY; + if (!strcmp(st,"badges")) ret |= HTTP_ACL_BADGES; + if (!strcmp(st,"management")) ret |= HTTP_ACL_MANAGEMENT; + if (!strcmp(st,"streaming")) ret |= HTTP_ACL_STREAMING; + if (!strcmp(st,"netdata.conf")) ret |= HTTP_ACL_NETDATACONF; + + return ret; +} + +static inline int bind_to_this(LISTEN_SOCKETS *sockets, const char *definition, uint16_t default_port, int listen_backlog) { + int added = 0; + HTTP_ACL acl_flags = HTTP_ACL_NONE; + + 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 = "", *portconfig; + + 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"; + acl_flags |= HTTP_ACL_API; + } + else if(strncmp(ip, "udp:", 4) == 0) { + ip += 4; + protocol = IPPROTO_UDP; + socktype = SOCK_DGRAM; + protocol_str = "udp"; + acl_flags |= HTTP_ACL_API_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) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: Cannot create unix socket '%s'", + path); + + sockets->failed++; + } else { + acl_flags = HTTP_ACL_API_UNIX | HTTP_ACL_DASHBOARD | HTTP_ACL_REGISTRY | HTTP_ACL_BADGES | + HTTP_ACL_MANAGEMENT | HTTP_ACL_NETDATACONF | HTTP_ACL_STREAMING | HTTP_ACL_SSL_DEFAULT; + listen_sockets_add(sockets, fd, AF_UNIX, socktype, protocol_str, path, 0, acl_flags); + 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 != '=') e++; + } + + if(*e == '%') { + *e = '\0'; + e++; + interface = e; + while(*e && *e != ':' && *e != '=') e++; + } + + if(*e == ':') { + port = e + 1; + *e = '\0'; + e++; + while(*e && *e != '=') e++; + } + + if(*e == '=') { + *e='\0'; + e++; + portconfig = e; + while (*e != '\0') { + if (*e == '|') { + *e = '\0'; + acl_flags |= read_acl(portconfig); + e++; + portconfig = e; + continue; + } + e++; + } + acl_flags |= read_acl(portconfig); + } else { + acl_flags |= HTTP_ACL_DASHBOARD | HTTP_ACL_REGISTRY | HTTP_ACL_BADGES | HTTP_ACL_MANAGEMENT | HTTP_ACL_NETDATACONF | HTTP_ACL_STREAMING | HTTP_ACL_SSL_DEFAULT; + } + + //Case the user does not set the option SSL in the "bind to", but he has + //the certificates, I must redirect, so I am assuming here the default option + if(!(acl_flags & HTTP_ACL_SSL_OPTIONAL) && !(acl_flags & HTTP_ACL_SSL_FORCE)) { + acl_flags |= HTTP_ACL_SSL_DEFAULT; + } + + uint32_t scope_id = 0; + if(*interface) { + scope_id = if_nametoindex(interface); + if(!scope_id) + nd_log(NDLS_DAEMON, NDLP_ERR, + "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) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "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); + 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); + fd = create_listen_socket6(socktype, scope_id, rip, rport, listen_backlog); + break; + } + + default: + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "LISTENER: Unknown socket family %d", + family); + + break; + } + + if (fd == -1) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: Cannot bind to ip '%s', port %d", + rip, rport); + + sockets->failed++; + } + else { + listen_sockets_add(sockets, fd, family, socktype, protocol_str, rip, rport, acl_flags); + added++; + } + } + + freeaddrinfo(result); + + return added; +} + +int listen_sockets_setup(LISTEN_SOCKETS *sockets) { + listen_sockets_init(sockets); + + sockets->backlog = (int) appconfig_get_number(sockets->config, sockets->config_section, "listen backlog", sockets->backlog); + + long long int old_port = sockets->default_port; + long long int new_port = appconfig_get_number(sockets->config, sockets->config_section, "default port", sockets->default_port); + if(new_port < 1 || new_port > 65535) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: Invalid listen port %lld given. Defaulting to %lld.", + new_port, old_port); + + sockets->default_port = (uint16_t) appconfig_set_number(sockets->config, sockets->config_section, "default port", old_port); + } + else sockets->default_port = (uint16_t)new_port; + + char *s = appconfig_get(sockets->config, 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((uint8_t)*e) || *e == ',') s = ++e; + + // move e(nd) to the first separator + while(*e && !isspace((uint8_t)*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++) + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "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 | DEFAULT_SOCKET_FLAGS, 0); + if(fd == -1) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "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) + nd_log(NDLS_DAEMON, NDLP_ERR, + "Failed to set timeout on UNIX socket '%s'", + path); + } + + sock_setcloexec(fd); + + 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) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "Cannot connect to UNIX socket on path '%s'.", + path); + + close(fd); + return -1; + } + + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "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 + +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) { + + nd_log(NDLS_DAEMON, NDLP_ERR, + "Cannot resolve host '%s', port '%s': %s", + host, service, gai_strerror(ai_err)); + + return -1; + } + + char hostBfr[NI_MAXHOST + 1]; + char servBfr[NI_MAXSERV + 1]; + + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_TXT(NDF_DST_IP, hostBfr), + ND_LOG_FIELD_TXT(NDF_DST_PORT, servBfr), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + int fd = -1; + for (ai = ai_head; ai != NULL && fd == -1; ai = ai->ai_next) { + if(nd_thread_signaled_to_cancel()) break; + + 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; + } + } + + getnameinfo(ai->ai_addr, + ai->ai_addrlen, + hostBfr, + sizeof(hostBfr), + servBfr, + sizeof(servBfr), + NI_NUMERICHOST | NI_NUMERICSERV); + + switch (ai->ai_addr->sa_family) { + case PF_INET: { + struct sockaddr_in *pSadrIn = (struct sockaddr_in *)ai->ai_addr; + (void)pSadrIn; + break; + } + + case PF_INET6: { + struct sockaddr_in6 *pSadrIn6 = (struct sockaddr_in6 *) ai->ai_addr; + (void)pSadrIn6; + break; + } + + default: { + // Unknown protocol family + continue; + } + } + + fd = socket(ai->ai_family, ai->ai_socktype | DEFAULT_SOCKET_FLAGS, ai->ai_protocol); + if(fd != -1) { + if(timeout) { + if(setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (char *) timeout, sizeof(struct timeval)) < 0) + nd_log(NDLS_DAEMON, NDLP_ERR, + "Failed to set timeout on the socket to ip '%s' port '%s'", + hostBfr, servBfr); + } + sock_setcloexec(fd); + + errno = 0; + if(connect(fd, ai->ai_addr, ai->ai_addrlen) < 0) { + if(errno == EALREADY || errno == EINPROGRESS) { + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "Waiting for connection to ip %s port %s to be established", + hostBfr, servBfr); + + // Convert 'struct timeval' to milliseconds for poll(): + int timeout_ms = timeout->tv_sec * 1000 + timeout->tv_usec / 1000; + + switch(wait_on_socket_or_cancel_with_timeout( +#ifdef ENABLE_HTTPS + NULL, +#endif + fd, timeout_ms, POLLOUT, NULL)) { + case 0: // proceed + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "connect() to ip %s port %s completed successfully", + hostBfr, servBfr); + break; + + case -1: // thread cancelled + nd_log(NDLS_DAEMON, NDLP_ERR, + "Thread is cancelled while connecting to '%s', port '%s'.", + hostBfr, servBfr); + + close(fd); + fd = -1; + break; + + case 1: // timeout + nd_log(NDLS_DAEMON, NDLP_ERR, + "Timed out while connecting to '%s', port '%s'.", + hostBfr, servBfr); + + close(fd); + fd = -1; + break; + + default: + case 2: // error + nd_log(NDLS_DAEMON, NDLP_ERR, + "Failed to connect to '%s', port '%s'.", + hostBfr, servBfr); + + close(fd); + fd = -1; + break; + } + } + else { + nd_log(NDLS_DAEMON, NDLP_ERR, + "Failed to connect to '%s', port '%s'", + hostBfr, servBfr); + + close(fd); + fd = -1; + } + } + } + else + nd_log(NDLS_DAEMON, NDLP_ERR, + "Failed to socket() to '%s', 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); + } + else if(*host == '/') { + char *path = host; + 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; + } + + if(!*host) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "Definition '%s' does not specify a host.", + definition); + + return -1; + } + + if(*interface) { + scope_id = if_nametoindex(interface); + if(!scope_id) + nd_log(NDLS_DAEMON, NDLP_ERR, + "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); +} + +void foreach_entry_in_connection_string(const char *destination, bool (*callback)(char *entry, void *data), void *data) { + const char *s = destination; + while(*s) { + const char *e = s; + + // skip separators, moving both s(tart) and e(nd) + while(isspace((uint8_t)*e) || *e == ',') s = ++e; + + // move e(nd) to the first separator + while(*e && !isspace((uint8_t)*e) && *e != ',') e++; + + // is there anything? + if(!*s || s == e) break; + + char buf[e - s + 1]; + strncpyz(buf, s, e - s); + + if(callback(buf, data)) break; + + s = e; + } +} + +struct connect_to_one_of_data { + int default_port; + struct timeval *timeout; + size_t *reconnects_counter; + char *connected_to; + size_t connected_to_size; + int sock; +}; + +static bool connect_to_one_of_callback(char *entry, void *data) { + struct connect_to_one_of_data *t = data; + + if(t->reconnects_counter) + t->reconnects_counter++; + + t->sock = connect_to_this(entry, t->default_port, t->timeout); + if(t->sock != -1) { + if(t->connected_to && t->connected_to_size) { + strncpyz(t->connected_to, entry, t->connected_to_size); + t->connected_to[t->connected_to_size - 1] = '\0'; + } + + return true; + } + + return false; +} + +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) { + struct connect_to_one_of_data t = { + .default_port = default_port, + .timeout = timeout, + .reconnects_counter = reconnects_counter, + .connected_to = connected_to, + .connected_to_size = connected_to_size, + .sock = -1, + }; + + foreach_entry_in_connection_string(destination, connect_to_one_of_callback, &t); + + return t.sock; +} + +static bool connect_to_one_of_urls_callback(char *entry, void *data) { + char *s = strchr(entry, '/'); + if(s) *s = '\0'; + + return connect_to_one_of_callback(entry, data); +} + +int connect_to_one_of_urls(const char *destination, int default_port, struct timeval *timeout, size_t *reconnects_counter, char *connected_to, size_t connected_to_size) { + struct connect_to_one_of_data t = { + .default_port = default_port, + .timeout = timeout, + .reconnects_counter = reconnects_counter, + .connected_to = connected_to, + .connected_to_size = connected_to_size, + .sock = -1, + }; + + foreach_entry_in_connection_string(destination, connect_to_one_of_urls_callback, &t); + + return t.sock; +} + + +// -------------------------------------------------------------------------------------------------------------------- +// helpers to send/receive data in one call, in blocking mode, with a timeout + +// returns: -1 = thread cancelled, 0 = proceed to read/write, 1 = time exceeded, 2 = error on fd +// timeout parameter can be zero to wait forever +inline int wait_on_socket_or_cancel_with_timeout( +#ifdef ENABLE_HTTPS + NETDATA_SSL *ssl, +#endif + int fd, int timeout_ms, short int poll_events, short int *revents) { + struct pollfd pfd = { + .fd = fd, + .events = poll_events, + .revents = 0, + }; + + bool forever = (timeout_ms == 0); + + while (timeout_ms > 0 || forever) { + if(nd_thread_signaled_to_cancel()) { + errno = ECANCELED; + return -1; + } + +#ifdef ENABLE_HTTPS + if(poll_events == POLLIN && ssl && SSL_connection(ssl) && netdata_ssl_has_pending(ssl)) + return 0; +#endif + + const int wait_ms = (timeout_ms >= ND_CHECK_CANCELLABILITY_WHILE_WAITING_EVERY_MS || forever) ? + ND_CHECK_CANCELLABILITY_WHILE_WAITING_EVERY_MS : timeout_ms; + + errno = 0; + + // check every wait_ms + const int ret = poll(&pfd, 1, wait_ms); + + if(revents) + *revents = pfd.revents; + + if(ret == -1) { + // poll failed + + if(errno == EINTR || errno == EAGAIN) + continue; + + return 2; + } + + if(ret == 0) { + // timeout + if(!forever) + timeout_ms -= wait_ms; + continue; + } + + if(pfd.revents & poll_events) + return 0; + + // all other errors + return 2; + } + + errno = ETIMEDOUT; + return 1; +} + +ssize_t recv_timeout( +#ifdef ENABLE_HTTPS + NETDATA_SSL *ssl, +#endif + int sockfd, void *buf, size_t len, int flags, int timeout) { + + switch(wait_on_socket_or_cancel_with_timeout( +#ifdef ENABLE_HTTPS + ssl, +#endif + sockfd, timeout * 1000, POLLIN, NULL)) { + case 0: // data are waiting + break; + + case 1: // timeout + return 0; + + default: + case -1: // thread cancelled + case 2: // error on socket + return -1; + } + +#ifdef ENABLE_HTTPS + if (SSL_connection(ssl)) { + return netdata_ssl_read(ssl, buf, len); + } +#endif + + return recv(sockfd, buf, len, flags); +} + +ssize_t send_timeout( +#ifdef ENABLE_HTTPS + NETDATA_SSL *ssl, +#endif + int sockfd, void *buf, size_t len, int flags, int timeout) { + + switch(wait_on_socket_or_cancel_with_timeout( +#ifdef ENABLE_HTTPS + ssl, +#endif + sockfd, timeout * 1000, POLLOUT, NULL)) { + case 0: // data are waiting + break; + + case 1: // timeout + return 0; + + default: + case -1: // thread cancelled + case 2: // error on socket + return -1; + } + +#ifdef ENABLE_HTTPS + if(ssl->conn) { + if (SSL_connection(ssl)) { + return netdata_ssl_write(ssl, buf, len); + } + else { + nd_log(NDLS_DAEMON, NDLP_ERR, + "cannot write to SSL connection - connection is not ready."); + + return -1; + } + } +#endif + 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; + +#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 + +/* + * --------------------------------------------------------------------------------------------------------------------- + * connection_allowed() - if there is an access list then check the connection matches a pattern. + * Numeric patterns are checked against the IP address first, only if they + * do not match is the hostname resolved (reverse-DNS) and checked. If the + * hostname matches then we perform forward DNS resolution to check the IP + * is really associated with the DNS record. This call is repeatable: the + * web server may check more refined matches against the connection. Will + * update the client_host if uninitialized - ensure the hostsize is the number + * of *writable* bytes (i.e. be aware of the strdup used to compact the pollinfo). + */ +int connection_allowed(int fd, char *client_ip, char *client_host, size_t hostsize, SIMPLE_PATTERN *access_list, + const char *patname, int allow_dns) +{ + if (!access_list) + return 1; + if (simple_pattern_matches(access_list, client_ip)) + return 1; + // If the hostname is unresolved (and needed) then attempt the DNS lookups. + //if (client_host[0]==0 && simple_pattern_is_potential_name(access_list)) + if (client_host[0]==0 && allow_dns) + { + struct sockaddr_storage sadr; + socklen_t addrlen = sizeof(sadr); + int err = getpeername(fd, (struct sockaddr*)&sadr, &addrlen); + if (err != 0 || + (err = getnameinfo((struct sockaddr *)&sadr, addrlen, client_host, (socklen_t)hostsize, + NULL, 0, NI_NAMEREQD)) != 0) { + + nd_log(NDLS_DAEMON, NDLP_ERR, + "Incoming %s on '%s' does not match a numeric pattern, and host could not be resolved (err=%s)", + patname, client_ip, gai_strerror(err)); + + if (hostsize >= 8) + strcpy(client_host,"UNKNOWN"); + return 0; + } + struct addrinfo *addr_infos = NULL; + if (getaddrinfo(client_host, NULL, NULL, &addr_infos) !=0 ) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: cannot validate hostname '%s' from '%s' by resolving it", + client_host, client_ip); + + if (hostsize >= 8) + strcpy(client_host,"UNKNOWN"); + return 0; + } + struct addrinfo *scan = addr_infos; + int validated = 0; + while (scan) { + char address[INET6_ADDRSTRLEN]; + address[0] = 0; + switch (scan->ai_addr->sa_family) { + case AF_INET: + inet_ntop(AF_INET, &((struct sockaddr_in*)(scan->ai_addr))->sin_addr, address, INET6_ADDRSTRLEN); + break; + case AF_INET6: + inet_ntop(AF_INET6, &((struct sockaddr_in6*)(scan->ai_addr))->sin6_addr, address, INET6_ADDRSTRLEN); + break; + } + if (!strcmp(client_ip, address)) { + validated = 1; + break; + } + scan = scan->ai_next; + } + if (!validated) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: Cannot validate '%s' as ip of '%s', not listed in DNS", + client_ip, client_host); + + if (hostsize >= 8) + strcpy(client_host,"UNKNOWN"); + } + if (addr_infos!=NULL) + freeaddrinfo(addr_infos); + } + if (!simple_pattern_matches(access_list, client_host)) + return 0; + + return 1; +} + +// -------------------------------------------------------------------------------------------------------------------- +// 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, + char *client_host, size_t hostsize, SIMPLE_PATTERN *access_list, int allow_dns) { + struct sockaddr_storage sadr; + socklen_t addrlen = sizeof(sadr); + + int nfd = accept4(fd, (struct sockaddr *)&sadr, &addrlen, flags | DEFAULT_SOCKET_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) { + + nd_log(NDLS_DAEMON, NDLP_ERR, + "LISTENER: cannot getnameinfo() on received client connection."); + + strncpyz(client_ip, "UNKNOWN", ipsize); + strncpyz(client_port, "UNKNOWN", portsize); + } + if (!strcmp(client_ip, "127.0.0.1") || !strcmp(client_ip, "::1")) { + strncpyz(client_ip, "localhost", ipsize); + } + sock_setcloexec(nfd); + +#ifdef __FreeBSD__ + if(((struct sockaddr *)&sadr)->sa_family == AF_LOCAL) + strncpyz(client_ip, "localhost", ipsize); +#endif + + client_ip[ipsize - 1] = '\0'; + client_port[portsize - 1] = '\0'; + + switch (((struct sockaddr *)&sadr)->sa_family) { + case AF_UNIX: + // netdata_log_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 + strncpyz(client_port, "UNIX", portsize); + break; + + case AF_INET: + // netdata_log_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); + // netdata_log_debug(D_LISTENER, "New IPv4 web client from %s port %s on socket %d.", client_ip, client_port, fd); + } + // else + // netdata_log_debug(D_LISTENER, "New IPv6 web client from %s port %s on socket %d.", client_ip, client_port, fd); + break; + + default: + // netdata_log_debug(D_LISTENER, "New UNKNOWN web client from %s port %s on socket %d.", client_ip, client_port, fd); + break; + } + if (!connection_allowed(nfd, client_ip, client_host, hostsize, access_list, "connection", allow_dns)) { + errno = 0; + nd_log(NDLS_DAEMON, NDLP_WARNING, + "Permission denied for client '%s', port '%s'", + client_ip, client_port); + + close(nfd); + nfd = -1; + errno = EPERM; + } + } +#ifdef HAVE_ACCEPT4 + else if (errno == ENOSYS) + nd_log(NDLS_DAEMON, NDLP_ERR, + "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 + , HTTP_ACL port_acl + , uint32_t flags + , const char *client_ip + , const char *client_port + , const char *client_host + , 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 +) { + if(unlikely(fd < 0)) return NULL; + + //if(p->limit && p->used >= p->limit) { + // nd_log(NDLS_DAEMON, NDLP_WARNING, "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; + + 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--) { + 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].port_acl = -1; + + p->inf[i].client_ip = NULL; + p->inf[i].client_port = NULL; + p->inf[i].client_host = 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; + + 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->port_acl = port_acl; + pi->flags = flags; + pi->next = NULL; + pi->client_ip = strdupz(client_ip); + pi->client_port = strdupz(client_port); + pi->client_host = strdupz(client_host); + + 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; + + 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; + } + + return pi; +} + +inline void poll_close_fd(POLLINFO *pi) { + POLLJOB *p = pi->p; + + struct pollfd *pf = &p->fds[pi->slot]; + + if(unlikely(pf->fd == -1)) return; + + if(pi->flags & POLLINFO_FLAG_CLIENT_SOCKET) { + pi->del_callback(pi); + + if(likely(!(pi->flags & POLLINFO_FLAG_DONT_CLOSE))) { + if(close(pf->fd) == -1) + nd_log(NDLS_DAEMON, NDLP_ERR, + "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; + + freez(pi->client_host); + pi->client_host = 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; + } + } + } +} + +void *poll_default_add_callback(POLLINFO *pi, short int *events, void *data) { + (void)pi; + (void)events; + (void)data; + + return NULL; +} + +void poll_default_del_callback(POLLINFO *pi) { + if(pi->data) + nd_log(NDLS_DAEMON, NDLP_ERR, + "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) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "POLLFD: poll_default_rcv_callback(): recv() failed with %zd.", + rc); + + return -1; + } + } else if (rc) { + // data received + nd_log(NDLS_DAEMON, NDLP_WARNING, + "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; + + nd_log(NDLS_DAEMON, NDLP_WARNING, + "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 *pptr) { + POLLJOB *p = CLEANUP_FUNCTION_GET_PTR(pptr); + if(!p) return; + + for(size_t i = 0 ; i <= p->max ; i++) { + POLLINFO *pi = &p->inf[i]; + poll_close_fd(pi); + } + + freez(p->fds); + freez(p->inf); +} + +static int poll_process_error(POLLINFO *pi, struct pollfd *pf, short int revents) { + ND_LOG_STACK lgs[] = { + ND_LOG_FIELD_TXT(NDF_SRC_IP, pi->client_ip), + ND_LOG_FIELD_TXT(NDF_SRC_PORT, pi->client_port), + ND_LOG_FIELD_END(), + }; + ND_LOG_STACK_PUSH(lgs); + + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "POLLFD: LISTENER: received %s %s %s on socket at slot %zu (fd %d) client '%s' port '%s' expecting %s %s %s, having %s %s %s" + , revents & POLLERR ? "POLLERR" : "" + , revents & POLLHUP ? "POLLHUP" : "" + , revents & POLLNVAL ? "POLLNVAL" : "" + , pi->slot + , pi->fd + , pi->client_ip ? pi->client_ip : "<undefined-ip>" + , pi->client_port ? pi->client_port : "<undefined-port>" + , pf->events & POLLIN ? "POLLIN" : "", pf->events & POLLOUT ? "POLLOUT" : "", pf->events & POLLPRI ? "POLLPRI" : "" + , revents & POLLIN ? "POLLIN" : "", revents & POLLOUT ? "POLLOUT" : "", revents & POLLPRI ? "POLLPRI" : "" + ); + + pf->events = 0; + poll_close_fd(pi); + return 1; +} + +static inline int poll_process_send(POLLJOB *p, POLLINFO *pi, struct pollfd *pf, time_t now) { + pi->last_sent_t = now; + pi->send_count++; + + pf->events = 0; + + // remember the slot, in case we need to close it later + // the callback may manipulate the socket list and our pf and pi pointers may be invalid after that call + size_t slot = pi->slot; + + if (unlikely(pi->snd_callback(pi, &pf->events) == -1)) + poll_close_fd(&p->inf[slot]); + + // IMPORTANT: + // pf and pi may be invalid below this point, they may have been reallocated. + + return 1; +} + +static inline int poll_process_tcp_read(POLLJOB *p, POLLINFO *pi, struct pollfd *pf, time_t now) { + pi->last_received_t = now; + pi->recv_count++; + + pf->events = 0; + + // remember the slot, in case we need to close it later + // the callback may manipulate the socket list and our pf and pi pointers may be invalid after that call + size_t slot = pi->slot; + + if (pi->rcv_callback(pi, &pf->events) == -1) + poll_close_fd(&p->inf[slot]); + + // IMPORTANT: + // pf and pi may be invalid below this point, they may have been reallocated. + + return 1; +} + +static inline int poll_process_udp_read(POLLINFO *pi, struct pollfd *pf, time_t now __maybe_unused) { + pi->last_received_t = now; + pi->recv_count++; + + // TODO: access_list is not applied to UDP + // but checking the access list on every UDP packet will destroy + // performance, especially for statsd. + + pf->events = 0; + if(pi->rcv_callback(pi, &pf->events) == -1) + return 0; + + // IMPORTANT: + // pf and pi may be invalid below this point, they may have been reallocated. + + return 1; +} + +static int poll_process_new_tcp_connection(POLLJOB *p, POLLINFO *pi, struct pollfd *pf, time_t now) { + pi->last_received_t = now; + pi->recv_count++; + + char client_ip[INET6_ADDRSTRLEN] = ""; + char client_port[NI_MAXSERV] = ""; + char client_host[NI_MAXHOST] = ""; + +#ifdef SOCK_NONBLOCK + int flags = SOCK_NONBLOCK; +#else + int flags = 0; +#endif + + int nfd = accept_socket( + pf->fd, flags, + client_ip, INET6_ADDRSTRLEN, client_port,NI_MAXSERV, client_host, NI_MAXHOST, + p->access_list, p->allow_dns + ); + +#ifndef SOCK_NONBLOCK + if (nfd > 0) { + int flags = fcntl(nfd, F_GETFL); + (void)fcntl(nfd, F_SETFL, flags| O_NONBLOCK); + } +#endif + + if (unlikely(nfd < 0)) { + // accept failed + + if(unlikely(errno == EMFILE)) { + nd_log_limit_static_global_var(erl, 10, 1000); + nd_log_limit(&erl, NDLS_DAEMON, NDLP_ERR, + "POLLFD: LISTENER: too many open files - used by this thread %zu, max for this thread %zu", + p->used, p->limit); + } + else if(unlikely(errno != EWOULDBLOCK && errno != EAGAIN)) + nd_log(NDLS_DAEMON, NDLP_ERR, + "POLLFD: LISTENER: accept() failed."); + + } + else { + // accept ok + + poll_add_fd(p + , nfd + , SOCK_STREAM + , pi->port_acl + , POLLINFO_FLAG_CLIENT_SOCKET + , client_ip + , client_port + , client_host + , p->add_callback + , p->del_callback + , p->rcv_callback + , p->snd_callback + , NULL + ); + + // IMPORTANT: + // pf and pi may be invalid below this point, they may have been reallocated. + + return 1; + } + + return 0; +} + +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*/) + , bool (*check_to_stop_callback)(void) + , SIMPLE_PATTERN *access_list + , int allow_dns + , 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) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "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, + .allow_dns = allow_dns, + + .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] + , sockets->fds_acl_flags[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; + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "POLLFD: LISTENER: listening on '%s'", + (sockets->fds_names[i])?sockets->fds_names[i]:"UNKNOWN"); + } + + int listen_sockets_active = 1; + + 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; + (void)last_timer_usec; + + if(unlikely(timer_usec)) { + now_usec = now_boottime_usec(); + next_timer_usec = now_usec - (now_usec % timer_usec) + timer_usec; + } + + CLEANUP_FUNCTION_REGISTER(poll_events_cleanup) cleanup_ptr = &p; + + while(!check_to_stop_callback() && !nd_thread_signaled_to_cancel()) { + if(unlikely(timer_usec)) { + now_usec = now_boottime_usec(); + + if(unlikely(timer_usec && now_usec >= next_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; + } + } + + // 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; + + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "%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); + } + } + } + + retval = poll(p.fds, p.max + 1, ND_CHECK_CANCELLABILITY_WHILE_WAITING_EVERY_MS); + time_t now = now_boottime_sec(); + + if(unlikely(retval == -1)) { + nd_log(NDLS_DAEMON, NDLP_ERR, + "POLLFD: LISTENER: poll() failed while waiting on %zu sockets.", + p.max + 1); + + break; + } + else if(unlikely(!retval)) { + // timeout + ; + } + else { + POLLINFO *pi; + struct pollfd *pf; + size_t idx, processed = 0; + short int revents; + + // keep fast lookup arrays per function + // to avoid looping through the entire list every time + size_t sends[p.max + 1], sends_max = 0; + size_t reads[p.max + 1], reads_max = 0; + size_t conns[p.max + 1], conns_max = 0; + size_t udprd[p.max + 1], udprd_max = 0; + + for (i = 0; i <= p.max; i++) { + pi = &p.inf[i]; + pf = &p.fds[i]; + revents = pf->revents; + + if(unlikely(revents == 0 || pf->fd == -1)) + continue; + + if (unlikely(revents & (POLLERR|POLLHUP|POLLNVAL))) { + // something is wrong to one of our sockets + + pf->revents = 0; + processed += poll_process_error(pi, pf, revents); + } + else if (likely(revents & POLLOUT)) { + // a client is ready to receive data + + sends[sends_max++] = i; + } + else if (likely(revents & (POLLIN|POLLPRI))) { + if (pi->flags & POLLINFO_FLAG_CLIENT_SOCKET) { + // a client sent data to us + + reads[reads_max++] = i; + } + else if (pi->flags & POLLINFO_FLAG_SERVER_SOCKET) { + // something is coming to our server sockets + + if(pi->socktype == SOCK_DGRAM) { + // UDP receive, directly on our listening socket + + udprd[udprd_max++] = i; + } + else if(pi->socktype == SOCK_STREAM) { + // new TCP connection + + conns[conns_max++] = i; + } + else + nd_log(NDLS_DAEMON, NDLP_ERR, + "POLLFD: LISTENER: server slot %zu (fd %d) connection from %s port %s using unhandled socket type %d." + , i + , pi->fd + , pi->client_ip ? pi->client_ip : "<undefined-ip>" + , pi->client_port ? pi->client_port : "<undefined-port>" + , pi->socktype + ); + } + else + nd_log(NDLS_DAEMON, NDLP_ERR, + "POLLFD: LISTENER: client slot %zu (fd %d) data from %s port %s using flags %08X is neither client nor server." + , i + , pi->fd + , pi->client_ip ? pi->client_ip : "<undefined-ip>" + , pi->client_port ? pi->client_port : "<undefined-port>" + , pi->flags + ); + } + else + nd_log(NDLS_DAEMON, NDLP_ERR, + "POLLFD: LISTENER: socket slot %zu (fd %d) client %s port %s unhandled event id %d." + , i + , pi->fd + , pi->client_ip ? pi->client_ip : "<undefined-ip>" + , pi->client_port ? pi->client_port : "<undefined-port>" + , revents + ); + } + + // process sends + for (idx = 0; idx < sends_max; idx++) { + i = sends[idx]; + pi = &p.inf[i]; + pf = &p.fds[i]; + pf->revents = 0; + processed += poll_process_send(&p, pi, pf, now); + } + + // process UDP reads + for (idx = 0; idx < udprd_max; idx++) { + i = udprd[idx]; + pi = &p.inf[i]; + pf = &p.fds[i]; + pf->revents = 0; + processed += poll_process_udp_read(pi, pf, now); + } + + // process TCP reads + for (idx = 0; idx < reads_max; idx++) { + i = reads[idx]; + pi = &p.inf[i]; + pf = &p.fds[i]; + pf->revents = 0; + processed += poll_process_tcp_read(&p, pi, pf, now); + } + + if(!processed && (!p.limit || p.used < p.limit)) { + // nothing processed above (rcv, snd) and we have room for another TCP connection + // so, accept one TCP connection + for (idx = 0; idx < conns_max; idx++) { + i = conns[idx]; + pi = &p.inf[i]; + pf = &p.fds[i]; + pf->revents = 0; + if (poll_process_new_tcp_connection(&p, pi, pf, now)) + break; + } + } + } + + if(unlikely(p.checks_every > 0 && now - last_check > p.checks_every)) { + last_check = now; + + // cleanup old sockets + 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)) { + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "POLLFD: LISTENER: client slot %zu (fd %d) from %s port %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 )) { + nd_log(NDLS_DAEMON, NDLP_DEBUG, + "POLLFD: LISTENER: client slot %zu (fd %d) from %s port %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); + } + } + } + } + } +} |