snmpc_hex2bin
ctxengineid = snmpc_hex2bin(optarg,
secengineid = snmpc_hex2bin(optarg,
privkey = snmpc_hex2bin(optarg, &privkeylen);
authkey = snmpc_hex2bin(optarg, &authkeylen);
char *snmpc_hex2bin(char *, size_t *);