/*------------------------------------------------------------------------
* snclient - send an SNMP request and wait for the response
*------------------------------------------------------------------------
*/
int
snclient(struct req_desc *rqdp, char *fport, int stdout)
{
u_char buff[SNMPMAXSZ], reqidsave[10], reqidsavelen;
int snmpdev, len;
rqdp->reqidlen = 0;
rqdp->err_stat = 0;
rqdp->err_idx = 0;
if ((len = mksnmp(rqdp, buff, rqdp->reqtype)) == SYSERR)
return SCL_BADREQ;
memcpy(reqidsave, rqdp->reqid, rqdp->reqidlen);
reqidsavelen = rqdp->reqidlen;
/* open the SNMP port and put into data mode */
if ((snmpdev = open(UDP, fport, ANYLPORT)) == SYSERR ||
control(snmpdev, DG_SETMODE, DG_DMODE | DG_TMODE) == SYSERR) {
close(snmpdev);
return SCL_OPENF;
}
if (write(snmpdev, buff, len) == SYSERR) {
close(snmpdev);
return SCL_WRITEF;
}
/* retry once, on timeout */
if ((len = read(snmpdev, buff, SNMPMAXSZ)) == TIMEOUT)
len = read(snmpdev, buff, SNMPMAXSZ);
if (len == TIMEOUT) {
close(snmpdev);
return SCL_NORESP;
} else if (len == SYSERR) {
close(snmpdev);
return SCL_READF;
}
if (snparse(rqdp, buff, len) == SYSERR) {
close(snmpdev);
return SCL_BADRESP;
}
if (reqidsavelen != rqdp->reqidlen ||
memcmp(reqidsave, rqdp->reqid, reqidsavelen)) {
close(snmpdev);
return SCL_BADRESP;
}
/* convert the sb_a1str's to objid's and their values */
if (sna2b(rqdp) == SYSERR) {
close(snmpdev);
return SCL_BADRESP;
}
close(snmpdev);
return SCL_OK;
}
/*------------------------------------------------------------------------
* snmpd - open the SNMP port and handle incoming queries
*------------------------------------------------------------------------
*/
int snmpd()
{
int snmpdev, len;
struct xgram *query;
struct req_desc rqd;
char str[128];
IPaddr from;
sninit();
query = (struct xgram *) getmem(sizeof (struct xgram));
/* open the SNMP server port */
if ((snmpdev = xinu_open(UDP, ANYFPORT, SNMPPORT)) == SYSERR)
return SYSERR;
while (TRUE) {
/*
* In this mode, give read the size of xgram, it returns
* number of bytes of *data* in xgram.
*/
len = xinu_read(snmpdev, query, sizeof(struct xgram));
blkcopy(from, query->xg_fip, IP_ALEN);
xinu_sprintf(str, "\n snmpd: from %u.%u.%u.%u",
BYTE(from, 0), BYTE(from, 1),
BYTE(from, 2), BYTE(from, 3));
xinu_write(SNMPLOG, str, xinu_strlen(str));
/* parse the packet into the request desc. structure */
if (snparse(&rqd, query->xg_data, len) == SYSERR) {
snfreebl(rqd.bindlf);
continue;
}
/* convert ASN.1 representations to internal forms */
if (sna2b(&rqd) == SYSERR) {
snfreebl(rqd.bindlf);
continue;
}
if (snrslv(&rqd) == SYSERR) {
len = mksnmp(&rqd, query->xg_data, PDU_RESP);
/* above call frees string memory */
query->xg_data[rqd.pdutype_pos] = PDU_RESP;
query->xg_data[rqd.err_stat_pos] = rqd.err_stat;
query->xg_data[rqd.err_idx_pos] = rqd.err_idx;
if (xinu_write(snmpdev, query, len) == SYSERR)
return SYSERR;
snfreebl(rqd.bindlf);
continue;
}
len = mksnmp(&rqd, query->xg_data, PDU_RESP);
if (len == SYSERR) {
query->xg_data[rqd.pdutype_pos] = PDU_RESP;
query->xg_data[rqd.err_stat_pos] = rqd.err_stat;
query->xg_data[rqd.err_idx_pos] = rqd.err_idx;
if (xinu_write(snmpdev, query, len) == SYSERR)
return SYSERR;
snfreebl(rqd.bindlf);
continue;
}
if (xinu_write(snmpdev, query, len) == SYSERR)
return SYSERR;
snfreebl(rqd.bindlf);
}
}
