diff options
Diffstat (limited to 'contrib/bsnmp/snmpd/trans_udp.c')
| -rw-r--r-- | contrib/bsnmp/snmpd/trans_udp.c | 439 |
1 files changed, 0 insertions, 439 deletions
diff --git a/contrib/bsnmp/snmpd/trans_udp.c b/contrib/bsnmp/snmpd/trans_udp.c deleted file mode 100644 index 8e9d1510d1d7..000000000000 --- a/contrib/bsnmp/snmpd/trans_udp.c +++ /dev/null @@ -1,439 +0,0 @@ -/* - * Copyright (c) 2003 - * Fraunhofer Institute for Open Communication Systems (FhG Fokus). - * All rights reserved. - * - * Author: Harti Brandt <harti@freebsd.org> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $Begemot: bsnmp/snmpd/trans_udp.c,v 1.5 2005/10/04 08:46:56 brandt_h Exp $ - * - * UDP transport - */ -#include <sys/types.h> -#include <sys/queue.h> -#include <sys/ucred.h> - -#include <stdbool.h> -#include <stdlib.h> -#include <syslog.h> -#include <string.h> -#include <errno.h> -#include <unistd.h> - -#include <netinet/in.h> -#include <arpa/inet.h> - -#include "snmpmod.h" -#include "snmpd.h" -#include "trans_udp.h" -#include "tree.h" -#include "oid.h" - -static int udp_start(void); -static int udp_stop(int); -static void udp_close_port(struct tport *); -static int udp_init_port(struct tport *); -static ssize_t udp_send(struct tport *, const u_char *, size_t, - const struct sockaddr *, size_t); -static ssize_t udp_recv(struct tport *, struct port_input *); - -/* exported */ -const struct transport_def udp_trans = { - "udp", - OIDX_begemotSnmpdTransUdp, - udp_start, - udp_stop, - udp_close_port, - udp_init_port, - udp_send, - udp_recv, - NULL -}; -static struct transport *my_trans; - -static int -udp_start(void) -{ - return (trans_register(&udp_trans, &my_trans)); -} - -static int -udp_stop(int force __unused) -{ - if (my_trans != NULL) - if (trans_unregister(my_trans) != 0) - return (SNMP_ERR_GENERR); - return (SNMP_ERR_NOERROR); -} - -/* - * A UDP port is ready - */ -static void -udp_input(int fd __unused, void *udata) -{ - struct udp_port *p = udata; - - p->input.peerlen = sizeof(p->ret); - snmpd_input(&p->input, &p->tport); -} - -/* - * Create a UDP socket and bind it to the given port - */ -static int -udp_init_port(struct tport *tp) -{ - struct udp_port *p = (struct udp_port *)tp; - struct sockaddr_in addr; - u_int32_t ip; - const int on = 1; - - if ((p->input.fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) { - syslog(LOG_ERR, "creating UDP socket: %m"); - return (SNMP_ERR_RES_UNAVAIL); - } - ip = (p->addr[0] << 24) | (p->addr[1] << 16) | (p->addr[2] << 8) | - p->addr[3]; - memset(&addr, 0, sizeof(addr)); - addr.sin_addr.s_addr = htonl(ip); - addr.sin_port = htons(p->port); - addr.sin_family = AF_INET; - addr.sin_len = sizeof(addr); - if (addr.sin_addr.s_addr == INADDR_ANY) { - if (setsockopt(p->input.fd, IPPROTO_IP, IP_RECVDSTADDR, &on, - sizeof(on)) == -1) { - syslog(LOG_ERR, "setsockopt(IP_RECVDSTADDR): %m"); - close(p->input.fd); - p->input.fd = -1; - return (SNMP_ERR_GENERR); - } - p->recvdstaddr = true; - } - if (bind(p->input.fd, (struct sockaddr *)&addr, sizeof(addr))) { - if (errno == EADDRNOTAVAIL) { - close(p->input.fd); - p->input.fd = -1; - return (SNMP_ERR_INCONS_NAME); - } - syslog(LOG_ERR, "bind: %s:%u %m", inet_ntoa(addr.sin_addr), - p->port); - close(p->input.fd); - p->input.fd = -1; - return (SNMP_ERR_GENERR); - } - if ((p->input.id = fd_select(p->input.fd, udp_input, - p, NULL)) == NULL) { - close(p->input.fd); - p->input.fd = -1; - return (SNMP_ERR_GENERR); - } - return (SNMP_ERR_NOERROR); -} - -/* - * Create a new SNMP Port object and start it, if we are not - * in initialization mode. The arguments are in host byte order. - */ -static int -udp_open_port(u_int8_t *addr, u_int32_t udp_port, struct udp_port **pp) -{ - struct udp_port *port; - int err; - - if (udp_port > 0xffff) - return (SNMP_ERR_NO_CREATION); - if ((port = malloc(sizeof(*port))) == NULL) - return (SNMP_ERR_GENERR); - memset(port, 0, sizeof(*port)); - - /* initialize common part */ - port->tport.index.len = 5; - port->tport.index.subs[0] = addr[0]; - port->tport.index.subs[1] = addr[1]; - port->tport.index.subs[2] = addr[2]; - port->tport.index.subs[3] = addr[3]; - port->tport.index.subs[4] = udp_port; - - port->addr[0] = addr[0]; - port->addr[1] = addr[1]; - port->addr[2] = addr[2]; - port->addr[3] = addr[3]; - port->port = udp_port; - - port->input.fd = -1; - port->input.id = NULL; - port->input.stream = 0; - port->input.cred = 0; - port->input.peer = (struct sockaddr *)&port->ret; - port->input.peerlen = sizeof(port->ret); - - trans_insert_port(my_trans, &port->tport); - - if (community != COMM_INITIALIZE && - (err = udp_init_port(&port->tport)) != SNMP_ERR_NOERROR) { - udp_close_port(&port->tport); - return (err); - } - *pp = port; - return (SNMP_ERR_NOERROR); -} - -/* - * Close an SNMP port - */ -static void -udp_close_port(struct tport *tp) -{ - struct udp_port *port = (struct udp_port *)tp; - - snmpd_input_close(&port->input); - trans_remove_port(tp); - free(port); -} - -/* - * Send something - */ -static ssize_t -udp_send(struct tport *tp, const u_char *buf, size_t len, - const struct sockaddr *addr, size_t addrlen) -{ - struct udp_port *p = (struct udp_port *)tp; - struct cmsghdr *cmsg; - struct msghdr msg; - char cbuf[CMSG_SPACE(sizeof(struct in_addr))]; - struct iovec iov; - - iov.iov_base = __DECONST(void*, buf); - iov.iov_len = len; - - msg.msg_flags = 0; - msg.msg_iov = &iov; - msg.msg_iovlen = 1; - msg.msg_name = __DECONST(void *, addr); - msg.msg_namelen = addrlen; - - if (p->recvdstaddr) { - msg.msg_control = cbuf; - msg.msg_controllen = sizeof(cbuf); - - cmsg = CMSG_FIRSTHDR(&msg); - cmsg->cmsg_level = IPPROTO_IP; - cmsg->cmsg_type = IP_SENDSRCADDR; - cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr)); - memcpy(CMSG_DATA(cmsg), &p->dstaddr, sizeof(struct in_addr)); - } else { - msg.msg_control = NULL; - msg.msg_controllen = 0; - } - - return (sendmsg(p->input.fd, &msg, 0)); -} - -static void -check_priv_dgram(struct port_input *pi, struct sockcred *cred) -{ - - /* process explicitly sends credentials */ - if (cred) - pi->priv = (cred->sc_euid == 0); - else - pi->priv = 0; -} - -/* - * Input from a datagram socket. - * Each receive should return one datagram. - */ -static ssize_t -udp_recv(struct tport *tp, struct port_input *pi) -{ - u_char embuf[1000]; - char cbuf[CMSG_SPACE(SOCKCREDSIZE(CMGROUP_MAX)) + - CMSG_SPACE(sizeof(struct in_addr))]; - struct udp_port *p = (struct udp_port *)tp; - struct msghdr msg; - struct iovec iov[1]; - ssize_t len; - struct cmsghdr *cmsg; - struct sockcred *cred = NULL; - - if (pi->buf == NULL) { - /* no buffer yet - allocate one */ - if ((pi->buf = buf_alloc(0)) == NULL) { - /* ups - could not get buffer. Read away input - * and drop it */ - (void)recvfrom(pi->fd, embuf, sizeof(embuf), - 0, NULL, NULL); - /* return error */ - return (-1); - } - pi->buflen = buf_size(0); - } - - /* try to get a message */ - msg.msg_name = pi->peer; - msg.msg_namelen = pi->peerlen; - msg.msg_iov = iov; - msg.msg_iovlen = 1; - memset(cbuf, 0, sizeof(cbuf)); - msg.msg_control = cbuf; - msg.msg_controllen = sizeof(cbuf); - msg.msg_flags = 0; - - iov[0].iov_base = pi->buf; - iov[0].iov_len = pi->buflen; - - len = recvmsg(pi->fd, &msg, 0); - - if (len == -1 || len == 0) - /* receive error */ - return (-1); - - if (msg.msg_flags & MSG_TRUNC) { - /* truncated - drop */ - snmpd_stats.silentDrops++; - snmpd_stats.inTooLong++; - return (-1); - } - - pi->length = (size_t)len; - - for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; - cmsg = CMSG_NXTHDR(&msg, cmsg)) { - if (cmsg->cmsg_level == IPPROTO_IP && - cmsg->cmsg_type == IP_RECVDSTADDR) - memcpy(&p->dstaddr, CMSG_DATA(cmsg), - sizeof(struct in_addr)); - if (cmsg->cmsg_level == SOL_SOCKET && - cmsg->cmsg_type == SCM_CREDS) - cred = (struct sockcred *)(void *)CMSG_DATA(cmsg); - } - - if (pi->cred) - check_priv_dgram(pi, cred); - - return (0); -} - -/* - * Port table - */ -int -op_snmp_port(struct snmp_context *ctx, struct snmp_value *value, - u_int sub, u_int iidx, enum snmp_op op) -{ - asn_subid_t which = value->var.subs[sub-1]; - struct udp_port *p; - u_int8_t addr[4]; - u_int32_t port; - - switch (op) { - - case SNMP_OP_GETNEXT: - if ((p = (struct udp_port *)trans_next_port(my_trans, - &value->var, sub)) == NULL) - return (SNMP_ERR_NOSUCHNAME); - index_append(&value->var, sub, &p->tport.index); - break; - - case SNMP_OP_GET: - if ((p = (struct udp_port *)trans_find_port(my_trans, - &value->var, sub)) == NULL) - return (SNMP_ERR_NOSUCHNAME); - break; - - case SNMP_OP_SET: - p = (struct udp_port *)trans_find_port(my_trans, - &value->var, sub); - ctx->scratch->int1 = (p != NULL); - - if (which != LEAF_begemotSnmpdPortStatus) - abort(); - if (!TRUTH_OK(value->v.integer)) - return (SNMP_ERR_WRONG_VALUE); - - ctx->scratch->int2 = TRUTH_GET(value->v.integer); - - if (ctx->scratch->int2) { - /* open an SNMP port */ - if (p != NULL) - /* already open - do nothing */ - return (SNMP_ERR_NOERROR); - - if (index_decode(&value->var, sub, iidx, addr, &port)) - return (SNMP_ERR_NO_CREATION); - return (udp_open_port(addr, port, &p)); - - } else { - /* close SNMP port - do in commit */ - } - return (SNMP_ERR_NOERROR); - - case SNMP_OP_ROLLBACK: - p = (struct udp_port *)trans_find_port(my_trans, - &value->var, sub); - if (ctx->scratch->int1 == 0) { - /* did not exist */ - if (ctx->scratch->int2 == 1) { - /* created */ - if (p != NULL) - udp_close_port(&p->tport); - } - } - return (SNMP_ERR_NOERROR); - - case SNMP_OP_COMMIT: - p = (struct udp_port *)trans_find_port(my_trans, - &value->var, sub); - if (ctx->scratch->int1 == 1) { - /* did exist */ - if (ctx->scratch->int2 == 0) { - /* delete */ - if (p != NULL) - udp_close_port(&p->tport); - } - } - return (SNMP_ERR_NOERROR); - - default: - abort(); - } - - /* - * Come here to fetch the value - */ - switch (which) { - - case LEAF_begemotSnmpdPortStatus: - value->v.integer = 1; - break; - - default: - abort(); - } - - return (SNMP_ERR_NOERROR); -} |