| #include <net-snmp/net-snmp-config.h> |
| |
| #ifdef NETSNMP_TRANSPORT_TCPIPV6_DOMAIN |
| |
| #include <net-snmp/types.h> |
| #include <net-snmp/library/snmpTCPIPv6Domain.h> |
| |
| #include <stdio.h> |
| #include <sys/types.h> |
| #include <errno.h> |
| |
| #if HAVE_STRING_H |
| #include <string.h> |
| #else |
| #include <strings.h> |
| #endif |
| #if HAVE_STDLIB_H |
| #include <stdlib.h> |
| #endif |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #if HAVE_SYS_SOCKET_H |
| #include <sys/socket.h> |
| #endif |
| #if HAVE_NETINET_IN_H |
| #include <netinet/in.h> |
| #endif |
| #if HAVE_ARPA_INET_H |
| #include <arpa/inet.h> |
| #endif |
| #if HAVE_NETDB_H |
| #include <netdb.h> |
| #endif |
| #if HAVE_FCNTL_H |
| #include <fcntl.h> |
| #endif |
| |
| #if HAVE_DMALLOC_H |
| #include <dmalloc.h> |
| #endif |
| |
| #include <net-snmp/types.h> |
| #include <net-snmp/output_api.h> |
| #include <net-snmp/config_api.h> |
| |
| #include <net-snmp/library/snmp_transport.h> |
| #include <net-snmp/library/snmpSocketBaseDomain.h> |
| #include <net-snmp/library/snmpTCPBaseDomain.h> |
| #include <net-snmp/library/tools.h> |
| |
| #include "inet_ntop.h" |
| |
| oid netsnmp_TCPIPv6Domain[] = { TRANSPORT_DOMAIN_TCP_IPV6 }; |
| static netsnmp_tdomain tcp6Domain; |
| |
| /* |
| * Return a string representing the address in data, or else the "far end" |
| * address if data is NULL. |
| */ |
| |
| static char * |
| netsnmp_tcp6_fmtaddr(netsnmp_transport *t, void *data, int len) |
| { |
| return netsnmp_ipv6_fmtaddr("TCP/IPv6", t, data, len); |
| } |
| |
| static int |
| netsnmp_tcp6_accept(netsnmp_transport *t) |
| { |
| struct sockaddr_in6 *farend = NULL; |
| int newsock = -1; |
| socklen_t farendlen = sizeof(struct sockaddr_in6); |
| |
| farend = (struct sockaddr_in6 *) malloc(sizeof(struct sockaddr_in6)); |
| |
| if (farend == NULL) { |
| /* |
| * Indicate that the acceptance of this socket failed. |
| */ |
| DEBUGMSGTL(("netsnmp_tcp6", "accept: malloc failed\n")); |
| return -1; |
| } |
| |
| if (t != NULL && t->sock >= 0) { |
| newsock = accept(t->sock, (struct sockaddr *) farend, &farendlen); |
| |
| if (newsock < 0) { |
| DEBUGMSGTL(("netsnmp_tcp6","accept failed rc %d errno %d \"%s\"\n", |
| newsock, errno, strerror(errno))); |
| free(farend); |
| return newsock; |
| } |
| |
| if (t->data != NULL) { |
| free(t->data); |
| } |
| |
| t->data = farend; |
| t->data_length = farendlen; |
| DEBUGIF("netsnmp_tcp6") { |
| char *str = netsnmp_tcp6_fmtaddr(NULL, farend, farendlen); |
| DEBUGMSGTL(("netsnmp_tcp6", "accept succeeded (from %s)\n", str)); |
| free(str); |
| } |
| |
| /* |
| * Try to make the new socket blocking. |
| */ |
| |
| if (netsnmp_set_non_blocking_mode(newsock, FALSE) < 0) |
| DEBUGMSGTL(("netsnmp_tcp6", |
| "accept: couldn't f_getfl of fd %d\n", newsock)); |
| |
| /* |
| * Allow user to override the send and receive buffers. Default is |
| * to use os default. Don't worry too much about errors -- |
| * just plough on regardless. |
| */ |
| netsnmp_sock_buffer_set(newsock, SO_SNDBUF, 1, 0); |
| netsnmp_sock_buffer_set(newsock, SO_RCVBUF, 1, 0); |
| |
| return newsock; |
| } else { |
| free(farend); |
| return -1; |
| } |
| } |
| |
| |
| |
| /* |
| * Open a TCP/IPv6-based transport for SNMP. Local is TRUE if addr is the |
| * local address to bind to (i.e. this is a server-type session); otherwise |
| * addr is the remote address to send things to. |
| */ |
| |
| netsnmp_transport * |
| netsnmp_tcp6_transport(struct sockaddr_in6 *addr, int local) |
| { |
| netsnmp_transport *t = NULL; |
| int rc = 0; |
| |
| #ifdef NETSNMP_NO_LISTEN_SUPPORT |
| if (local) |
| return NULL; |
| #endif /* NETSNMP_NO_LISTEN_SUPPORT */ |
| |
| if (addr == NULL || addr->sin6_family != AF_INET6) { |
| return NULL; |
| } |
| |
| t = SNMP_MALLOC_TYPEDEF(netsnmp_transport); |
| if (t == NULL) { |
| return NULL; |
| } |
| |
| DEBUGIF("netsnmp_tcp6") { |
| char *str = netsnmp_tcp6_fmtaddr(NULL, (void *)addr, |
| sizeof(struct sockaddr_in6)); |
| DEBUGMSGTL(("netsnmp_tcp6", "open %s %s\n", local ? "local" : "remote", |
| str)); |
| free(str); |
| } |
| |
| t->data = malloc(sizeof(netsnmp_indexed_addr_pair)); |
| if (t->data == NULL) { |
| netsnmp_transport_free(t); |
| return NULL; |
| } |
| t->data_length = sizeof(netsnmp_indexed_addr_pair); |
| memcpy(t->data, addr, sizeof(struct sockaddr_in6)); |
| |
| t->domain = netsnmp_TCPIPv6Domain; |
| t->domain_length = sizeof(netsnmp_TCPIPv6Domain) / sizeof(oid); |
| |
| t->sock = socket(PF_INET6, SOCK_STREAM, 0); |
| if (t->sock < 0) { |
| netsnmp_transport_free(t); |
| return NULL; |
| } |
| |
| t->flags = NETSNMP_TRANSPORT_FLAG_STREAM; |
| |
| if (local) { |
| #ifndef NETSNMP_NO_LISTEN_SUPPORT |
| int opt = 1; |
| |
| /* |
| * This session is inteneded as a server, so we must bind on to the |
| * given IP address, which may include an interface address, or could |
| * be INADDR_ANY, but certainly includes a port number. |
| */ |
| |
| #ifdef IPV6_V6ONLY |
| /* Try to restrict PF_INET6 socket to IPv6 communications only. */ |
| { |
| int one=1; |
| if (setsockopt(t->sock, IPPROTO_IPV6, IPV6_V6ONLY, (char *)&one, sizeof(one)) != 0) { |
| DEBUGMSGTL(("netsnmp_tcp6", "couldn't set IPV6_V6ONLY to %d bytes: %s\n", one, strerror(errno))); |
| } |
| } |
| #endif |
| |
| t->flags |= NETSNMP_TRANSPORT_FLAG_LISTEN; |
| t->local = (unsigned char*)malloc(18); |
| if (t->local == NULL) { |
| netsnmp_socketbase_close(t); |
| netsnmp_transport_free(t); |
| return NULL; |
| } |
| memcpy(t->local, addr->sin6_addr.s6_addr, 16); |
| t->local[16] = (ntohs(addr->sin6_port) & 0xff00) >> 8; |
| t->local[17] = (ntohs(addr->sin6_port) & 0x00ff) >> 0; |
| t->local_length = 18; |
| |
| /* |
| * We should set SO_REUSEADDR too. |
| */ |
| |
| setsockopt(t->sock, SOL_SOCKET, SO_REUSEADDR, (void *)&opt, sizeof(opt)); |
| |
| rc = bind(t->sock, (struct sockaddr *) addr, |
| sizeof(struct sockaddr_in6)); |
| if (rc != 0) { |
| netsnmp_socketbase_close(t); |
| netsnmp_transport_free(t); |
| return NULL; |
| } |
| |
| /* |
| * Since we are going to be letting select() tell us when connections |
| * are ready to be accept()ed, we need to make the socket n0n-blocking |
| * to avoid the race condition described in W. R. Stevens, ``Unix |
| * Network Programming Volume I Second Edition'', pp. 422--4, which |
| * could otherwise wedge the agent. |
| */ |
| |
| netsnmp_set_non_blocking_mode(t->sock, TRUE); |
| |
| /* |
| * Now sit here and wait for connections to arrive. |
| */ |
| |
| rc = listen(t->sock, NETSNMP_STREAM_QUEUE_LEN); |
| if (rc != 0) { |
| netsnmp_socketbase_close(t); |
| netsnmp_transport_free(t); |
| return NULL; |
| } |
| |
| /* |
| * no buffer size on listen socket - doesn't make sense |
| */ |
| #else /* NETSNMP_NO_LISTEN_SUPPORT */ |
| return NULL; |
| #endif /* NETSNMP_NO_LISTEN_SUPPORT */ |
| } else { |
| t->remote = (unsigned char*)malloc(18); |
| if (t->remote == NULL) { |
| netsnmp_socketbase_close(t); |
| netsnmp_transport_free(t); |
| return NULL; |
| } |
| memcpy(t->remote, addr->sin6_addr.s6_addr, 16); |
| t->remote[16] = (ntohs(addr->sin6_port) & 0xff00) >> 8; |
| t->remote[17] = (ntohs(addr->sin6_port) & 0x00ff) >> 0; |
| t->remote_length = 18; |
| |
| /* |
| * This is a client-type session, so attempt to connect to the far |
| * end. We don't go non-blocking here because it's not obvious what |
| * you'd then do if you tried to do snmp_sends before the connection |
| * had completed. So this can block. |
| */ |
| |
| rc = connect(t->sock, (struct sockaddr *) addr, |
| sizeof(struct sockaddr_in6)); |
| |
| DEBUGMSGTL(("netsnmp_tcp6", "connect returns %d\n", rc)); |
| |
| if (rc < 0) { |
| netsnmp_socketbase_close(t); |
| netsnmp_transport_free(t); |
| return NULL; |
| } |
| |
| /* |
| * Allow user to override the send and receive buffers. Default is |
| * to use os default. Don't worry too much about errors -- |
| * just plough on regardless. |
| */ |
| netsnmp_sock_buffer_set(t->sock, SO_SNDBUF, local, 0); |
| netsnmp_sock_buffer_set(t->sock, SO_RCVBUF, local, 0); |
| } |
| |
| /* |
| * Message size is not limited by this transport (hence msgMaxSize |
| * is equal to the maximum legal size of an SNMP message). |
| */ |
| |
| t->msgMaxSize = 0x7fffffff; |
| t->f_recv = netsnmp_tcpbase_recv; |
| t->f_send = netsnmp_tcpbase_send; |
| t->f_close = netsnmp_socketbase_close; |
| t->f_accept = netsnmp_tcp6_accept; |
| t->f_fmtaddr = netsnmp_tcp6_fmtaddr; |
| |
| return t; |
| } |
| |
| /* |
| * Not extern but still defined in snmpUDPIPv6Domain.c |
| */ |
| extern int |
| netsnmp_sockaddr_in6_2(struct sockaddr_in6*, const char*, const char*); |
| |
| netsnmp_transport * |
| netsnmp_tcp6_create_tstring(const char *str, int local, |
| const char *default_target) |
| { |
| struct sockaddr_in6 addr; |
| |
| if (netsnmp_sockaddr_in6_2(&addr, str, default_target)) { |
| return netsnmp_tcp6_transport(&addr, local); |
| } else { |
| return NULL; |
| } |
| } |
| |
| |
| /* |
| * See: |
| * |
| * http://www.ietf.org/internet-drafts/draft-ietf-ops-taddress-mib-01.txt |
| * |
| * (or newer equivalent) for details of the TC which we are using for |
| * the mapping here. |
| */ |
| |
| netsnmp_transport * |
| netsnmp_tcp6_create_ostring(const u_char * o, size_t o_len, int local) |
| { |
| struct sockaddr_in6 addr; |
| |
| if (o_len == 18) { |
| memset((u_char *) & addr, 0, sizeof(struct sockaddr_in6)); |
| addr.sin6_family = AF_INET6; |
| memcpy((u_char *) & (addr.sin6_addr.s6_addr), o, 16); |
| addr.sin6_port = htons((o[16] << 8) + o[17]); |
| return netsnmp_tcp6_transport(&addr, local); |
| } |
| return NULL; |
| } |
| |
| |
| void |
| netsnmp_tcpipv6_ctor(void) |
| { |
| tcp6Domain.name = netsnmp_TCPIPv6Domain; |
| tcp6Domain.name_length = sizeof(netsnmp_TCPIPv6Domain) / sizeof(oid); |
| tcp6Domain.f_create_from_tstring = NULL; |
| tcp6Domain.f_create_from_tstring_new = netsnmp_tcp6_create_tstring; |
| tcp6Domain.f_create_from_ostring = netsnmp_tcp6_create_ostring; |
| tcp6Domain.prefix = (const char**)calloc(4, sizeof(char *)); |
| tcp6Domain.prefix[0] = "tcp6"; |
| tcp6Domain.prefix[1] = "tcpv6"; |
| tcp6Domain.prefix[2] = "tcpipv6"; |
| |
| netsnmp_tdomain_register(&tcp6Domain); |
| } |
| |
| #endif /* NETSNMP_TRANSPORT_TCPIPV6_DOMAIN */ |
| |
