1 /* 2 * inet_proto.c 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Alexey Kuznetsov, <kuznet (at) ms2.inr.ac.ru> 10 * 11 */ 12 13 #include <stdio.h> 14 #include <stdlib.h> 15 #include <unistd.h> 16 #include <syslog.h> 17 #include <fcntl.h> 18 #include <sys/socket.h> 19 #include <netinet/in.h> 20 #include <netdb.h> 21 #include <string.h> 22 23 #include "utils.h" 24 25 char *inet_proto_n2a(int proto, char *buf, int len) 26 { 27 static char ncache[16]; 28 static int icache = -1; 29 struct protoent *pe; 30 31 if (proto == icache) 32 return ncache; 33 34 pe = getprotobynumber(proto); 35 if (pe) { 36 icache = proto; 37 strncpy(ncache, pe->p_name, 16); 38 strncpy(buf, pe->p_name, len); 39 return buf; 40 } 41 snprintf(buf, len, "ipproto-%d", proto); 42 return buf; 43 } 44 45 int inet_proto_a2n(char *buf) 46 { 47 static char ncache[16]; 48 static int icache = -1; 49 struct protoent *pe; 50 51 if (icache>=0 && strcmp(ncache, buf) == 0) 52 return icache; 53 54 if (buf[0] >= '0' && buf[0] <= '9') { 55 __u8 ret; 56 if (get_u8(&ret, buf, 10)) 57 return -1; 58 return ret; 59 } 60 61 pe = getprotobyname(buf); 62 if (pe) { 63 icache = pe->p_proto; 64 strncpy(ncache, pe->p_name, 16); 65 return pe->p_proto; 66 } 67 return -1; 68 } 69 70 71
