/contrib/bsnmp/snmpd/trans_udp.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 319 lines · 217 code · 39 blank · 63 comment · 46 complexity · a6aa8fc3b6ec1daece69b46271d6e6bf MD5 · raw file
- /*
- * 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 <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);
- /* exported */
- const struct transport_def udp_trans = {
- "udp",
- OIDX_begemotSnmpdTransUdp,
- udp_start,
- udp_stop,
- udp_close_port,
- udp_init_port,
- udp_send
- };
- 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 &&
- 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);
- }
- 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;
- return (sendto(p->input.fd, buf, len, 0, addr, addrlen));
- }
- /*
- * 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);
- }