diff options
Diffstat (limited to 'contrib/bsnmp/snmpd/trans_udp.c')
-rw-r--r-- | contrib/bsnmp/snmpd/trans_udp.c | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/contrib/bsnmp/snmpd/trans_udp.c b/contrib/bsnmp/snmpd/trans_udp.c new file mode 100644 index 0000000..c55c4e1 --- /dev/null +++ b/contrib/bsnmp/snmpd/trans_udp.c @@ -0,0 +1,313 @@ +/* + * Copyright (c) 2003 + * Fraunhofer Institute for Open Communication Systems (FhG Fokus). + * All rights reserved. + * + * Author: Harti Brandt <harti@freebsd.org> + * + * Redistribution of this software and documentation 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 or documentation 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. + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE AND DOCUMENTATION IS PROVIDED BY FRAUNHOFER FOKUS + * AND ITS 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 + * FRAUNHOFER FOKUS OR ITS 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 1.3 2003/12/09 12:28:53 hbb Exp $ + * + * UDP transport + */ +#include <sys/types.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; + + 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 (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 initialisation 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); +} |