static int /* O - 0 on success or -1 on error */
try_connect(http_addr_t *addr, /* I - Socket address */
const char *addrname, /* I - Hostname or IP address */
int port) /* I - Port number */
{
int fd; /* Socket */
int status; /* Connection status */
debug_printf("DEBUG: %.3f Trying %s://%s:%d...\n", run_time(),
port == 515 ? "lpd" : "socket", addrname, port);
if ((fd = socket(httpAddrFamily(addr), SOCK_STREAM, 0)) < 0)
{
fprintf(stderr, "ERROR: Unable to create socket: %s\n",
strerror(errno));
return (-1);
}
_httpAddrSetPort(addr, port);
alarm(1);
status = connect(fd, (void *)addr, (socklen_t)httpAddrLength(addr));
close(fd);
alarm(0);
return (status);
}
int /* O - 1 on success, 0 on error */
_cupsSNMPWrite(
int fd, /* I - SNMP socket */
http_addr_t *address, /* I - Address to send to */
int version, /* I - SNMP version */
const char *community, /* I - Community name */
cups_asn1_t request_type, /* I - Request type */
const unsigned request_id, /* I - Request ID */
const int *oid) /* I - OID */
{
int i; /* Looping var */
cups_snmp_t packet; /* SNMP message packet */
unsigned char buffer[CUPS_SNMP_MAX_PACKET];
/* SNMP message buffer */
int bytes; /* Size of message */
http_addr_t temp; /* Copy of address */
/*
* Range check input...
*/
DEBUG_printf(("4_cupsSNMPWrite(fd=%d, address=%p, version=%d, "
"community=\"%s\", request_type=%d, request_id=%u, oid=%p)",
fd, address, version, community, request_type, request_id, oid));
if (fd < 0 || !address || version != CUPS_SNMP_VERSION_1 || !community ||
(request_type != CUPS_ASN1_GET_REQUEST &&
request_type != CUPS_ASN1_GET_NEXT_REQUEST) || request_id < 1 || !oid)
{
DEBUG_puts("5_cupsSNMPWrite: Returning 0 (bad arguments)");
return (0);
}
/*
* Create the SNMP message...
*/
memset(&packet, 0, sizeof(packet));
packet.version = version;
packet.request_type = request_type;
packet.request_id = request_id;
packet.object_type = CUPS_ASN1_NULL_VALUE;
strlcpy(packet.community, community, sizeof(packet.community));
for (i = 0; oid[i] >= 0 && i < (CUPS_SNMP_MAX_OID - 1); i ++)
packet.object_name[i] = oid[i];
packet.object_name[i] = -1;
if (oid[i] >= 0)
{
DEBUG_puts("5_cupsSNMPWrite: Returning 0 (OID too big)");
errno = E2BIG;
return (0);
}
bytes = asn1_encode_snmp(buffer, sizeof(buffer), &packet);
if (bytes < 0)
{
DEBUG_puts("5_cupsSNMPWrite: Returning 0 (request too big)");
errno = E2BIG;
return (0);
}
asn1_debug("DEBUG: OUT ", buffer, bytes, 0);
/*
* Send the message...
*/
temp = *address;
_httpAddrSetPort(&temp, CUPS_SNMP_PORT);
return (sendto(fd, buffer, bytes, 0, (void *)&temp,
httpAddrLength(&temp)) == bytes);
}
static int /* O - Socket or -1 on error */
rresvport_af(int *port, /* IO - Port number to bind to */
int family) /* I - Address family */
{
http_addr_t addr; /* Socket address */
int fd; /* Socket file descriptor */
/*
* Try to create an IPv4 socket...
*/
if ((fd = socket(family, SOCK_STREAM, 0)) < 0)
return (-1);
/*
* Initialize the address buffer...
*/
memset(&addr, 0, sizeof(addr));
addr.addr.sa_family = family;
/*
* Try to bind the socket to a reserved port...
*/
while (*port > 511)
{
/*
* Set the port number...
*/
_httpAddrSetPort(&addr, *port);
/*
* Try binding the port to the socket; return if all is OK...
*/
if (!bind(fd, (struct sockaddr *)&addr, sizeof(addr)))
return (fd);
/*
* Stop if we have any error other than "address already in use"...
*/
if (errno != EADDRINUSE)
{
# ifdef WIN32
closesocket(fd);
# else
close(fd);
# endif /* WIN32 */
return (-1);
}
/*
* Try the next port...
*/
(*port)--;
}
/*
* Wasn't able to bind to a reserved port, so close the socket and return
* -1...
*/
# ifdef WIN32
closesocket(fd);
# else
close(fd);
# endif /* WIN32 */
return (-1);
}
