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https://git.proxmox.com/git/mirror_iproute2
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cfda500a7d
The original intent was to make sure strings written by those functions are NUL-terminated at all times, though it was suggested to get rid of the 15 char protocol name limit as well which this patch accomplishes. In addition to that, simplify inet_proto_a2n() a bit: Use the error checking in get_u8() to find out whether passed 'buf' contains a valid decimal number instead of checking the first character's value manually. Signed-off-by: Phil Sutter <phil@nwl.cc>
72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
/*
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* inet_proto.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <string.h>
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#include "rt_names.h"
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#include "utils.h"
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const char *inet_proto_n2a(int proto, char *buf, int len)
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{
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static char *ncache;
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static int icache = -1;
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struct protoent *pe;
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if (proto == icache)
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return ncache;
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pe = getprotobynumber(proto);
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if (pe) {
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if (icache != -1)
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free(ncache);
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icache = proto;
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ncache = strdup(pe->p_name);
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strncpy(buf, pe->p_name, len - 1);
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buf[len - 1] = '\0';
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return buf;
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}
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snprintf(buf, len, "ipproto-%d", proto);
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return buf;
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}
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int inet_proto_a2n(const char *buf)
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{
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static char *ncache;
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static int icache = -1;
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struct protoent *pe;
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__u8 ret;
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if (icache != -1 && strcmp(ncache, buf) == 0)
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return icache;
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if (!get_u8(&ret, buf, 10))
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return ret;
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pe = getprotobyname(buf);
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if (pe) {
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if (icache != -1)
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free(ncache);
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icache = pe->p_proto;
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ncache = strdup(pe->p_name);
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return pe->p_proto;
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}
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return -1;
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}
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