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ifchange.c: inet_ntop won't fail so long as we always use a statically

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determined valid address family and sufficiently long destination buffer.
This commit is contained in:
Nicholas J. Kain 2014-03-19 19:14:38 -04:00
parent fa801fbec4
commit f5281ee7ab
1 changed files with 6 additions and 30 deletions
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36
ndhc/ifchange.c
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@ -123,11 +123,7 @@ static int ifcmd_ip(char *buf, size_t buflen, char *optname,
if (!optdata || optlen < 4)
return -1;
char ipbuf[INET_ADDRSTRLEN];
if (!inet_ntop(AF_INET, optdata, ipbuf, sizeof ipbuf)) {
log_warning("%s: (%s) inet_ntop failed: %s",
client_config.interface, __func__, strerror(errno));
return -1;
}
inet_ntop(AF_INET, optdata, ipbuf, sizeof ipbuf);
return ifcmd_raw(buf, buflen, optname, ipbuf, strlen(ipbuf));
}
@ -142,11 +138,7 @@ static int ifcmd_iplist(char *out, size_t outlen, char *optname,
if (!optdata || optlen < 4)
return -1;
if (!inet_ntop(AF_INET, optdata + optoff, ipbuf, sizeof ipbuf)) {
log_warning("%s: (%s) inet_ntop failed: %s",
client_config.interface, __func__, strerror(errno));
return -1;
}
inet_ntop(AF_INET, optdata + optoff, ipbuf, sizeof ipbuf);
ssize_t wc = snprintf(buf + bufoff, sizeof buf, "%s:%s", optname, ipbuf);
if (wc < 0 || (size_t)wc >= sizeof buf)
return -1;
@ -154,11 +146,7 @@ static int ifcmd_iplist(char *out, size_t outlen, char *optname,
bufoff += wc;
while (optlen - optoff >= 4) {
if (!inet_ntop(AF_INET, optdata + optoff, ipbuf, sizeof ipbuf)) {
log_warning("%s: (%s) inet_ntop failed: %s",
client_config.interface, __func__, strerror(errno));
return -1;
}
inet_ntop(AF_INET, optdata + optoff, ipbuf, sizeof ipbuf);
wc = snprintf(buf + bufoff, sizeof buf, ",%s", ipbuf);
if (wc < 0 || (size_t)wc >= sizeof buf)
return -1;
@ -229,20 +217,12 @@ static size_t send_client_ip(char *out, size_t olen, struct dhcpmsg *packet)
if (memcmp(&packet->yiaddr, &cfg_packet.yiaddr, sizeof packet->yiaddr))
change_ipaddr = true;
if (!inet_ntop(AF_INET, &packet->yiaddr, ip, sizeof ip)) {
log_warning("%s: (%s) inet_ntop for ip failed: %s",
client_config.interface, __func__, strerror(errno));
return 0;
}
inet_ntop(AF_INET, &packet->yiaddr, ip, sizeof ip);
optlen = get_dhcp_opt(packet, DCODE_SUBNET, optdata, sizeof optdata);
if (optlen >= 4) {
have_subnet = true;
if (!inet_ntop(AF_INET, optdata, sn, sizeof sn)) {
log_warning("%s: (%s) inet_ntop for subnet failed: %s",
client_config.interface, __func__, strerror(errno));
return 0;
}
inet_ntop(AF_INET, optdata, sn, sizeof sn);
oldlen = get_dhcp_opt(&cfg_packet, DCODE_SUBNET, olddata,
sizeof olddata);
if (oldlen != optlen || memcmp(optdata, olddata, optlen))
@ -252,11 +232,7 @@ static size_t send_client_ip(char *out, size_t olen, struct dhcpmsg *packet)
optlen = get_dhcp_opt(packet, DCODE_BROADCAST, optdata, sizeof optdata);
if (optlen >= 4) {
have_bcast = true;
if (!inet_ntop(AF_INET, optdata, bc, sizeof bc)) {
log_warning("%s: (%s) inet_ntop for broadcast failed: %s",
client_config.interface, __func__, strerror(errno));
return 0;
}
inet_ntop(AF_INET, optdata, bc, sizeof bc);
oldlen = get_dhcp_opt(&cfg_packet, DCODE_BROADCAST, olddata,
sizeof olddata);
if (oldlen != optlen || memcmp(optdata, olddata, optlen))