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firewall-util: use fixed size array for chain name
xt_chainlabel is defined as ``` typedef char xt_chainlabel[32]; ```
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4bbccb02ea
commit
d14be488a7
@ -90,6 +90,7 @@ int fw_add_masquerade(
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const union in_addr_union *destination,
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unsigned destination_prefixlen) {
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static const xt_chainlabel chain = "POSTROUTING";
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_cleanup_(iptc_freep) struct xtc_handle *h = NULL;
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struct ipt_entry *entry, *mask;
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struct ipt_entry_target *t;
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@ -133,15 +134,15 @@ int fw_add_masquerade(
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memset(mask, 0xFF, sz);
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if (add) {
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if (iptc_check_entry("POSTROUTING", entry, (unsigned char*) mask, h))
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if (iptc_check_entry(chain, entry, (unsigned char*) mask, h))
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return 0;
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if (errno != ENOENT) /* if other error than not existing yet, fail */
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return -errno;
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if (!iptc_insert_entry("POSTROUTING", entry, 0, h))
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if (!iptc_insert_entry(chain, entry, 0, h))
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return -errno;
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} else {
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if (!iptc_delete_entry("POSTROUTING", entry, (unsigned char*) mask, h)) {
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if (!iptc_delete_entry(chain, entry, (unsigned char*) mask, h)) {
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if (errno == ENOENT) /* if it's already gone, all is good! */
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return 0;
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@ -169,6 +170,7 @@ int fw_add_local_dnat(
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uint16_t remote_port,
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const union in_addr_union *previous_remote) {
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static const xt_chainlabel chain_pre = "PREROUTING", chain_output = "OUTPUT";
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_cleanup_(iptc_freep) struct xtc_handle *h = NULL;
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struct ipt_entry *entry, *mask;
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struct ipt_entry_target *t;
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@ -275,11 +277,11 @@ int fw_add_local_dnat(
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if (add) {
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/* Add the PREROUTING rule, if it is missing so far */
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if (!iptc_check_entry("PREROUTING", entry, (unsigned char*) mask, h)) {
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if (!iptc_check_entry(chain_pre, entry, (unsigned char*) mask, h)) {
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if (errno != ENOENT)
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return -EINVAL;
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if (!iptc_insert_entry("PREROUTING", entry, 0, h))
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if (!iptc_insert_entry(chain_pre, entry, 0, h))
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return -errno;
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}
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@ -287,7 +289,7 @@ int fw_add_local_dnat(
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if (previous_remote && previous_remote->in.s_addr != remote->in.s_addr) {
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mr->range[0].min_ip = mr->range[0].max_ip = previous_remote->in.s_addr;
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if (!iptc_delete_entry("PREROUTING", entry, (unsigned char*) mask, h)) {
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if (!iptc_delete_entry(chain_pre, entry, (unsigned char*) mask, h)) {
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if (errno != ENOENT)
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return -errno;
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}
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@ -305,11 +307,11 @@ int fw_add_local_dnat(
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entry->ip.invflags = IPT_INV_DSTIP;
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}
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if (!iptc_check_entry("OUTPUT", entry, (unsigned char*) mask, h)) {
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if (!iptc_check_entry(chain_output, entry, (unsigned char*) mask, h)) {
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if (errno != ENOENT)
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return -errno;
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if (!iptc_insert_entry("OUTPUT", entry, 0, h))
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if (!iptc_insert_entry(chain_output, entry, 0, h))
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return -errno;
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}
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@ -317,14 +319,14 @@ int fw_add_local_dnat(
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if (previous_remote && previous_remote->in.s_addr != remote->in.s_addr) {
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mr->range[0].min_ip = mr->range[0].max_ip = previous_remote->in.s_addr;
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if (!iptc_delete_entry("OUTPUT", entry, (unsigned char*) mask, h)) {
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if (!iptc_delete_entry(chain_output, entry, (unsigned char*) mask, h)) {
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if (errno != ENOENT)
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return -errno;
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}
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}
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}
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} else {
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if (!iptc_delete_entry("PREROUTING", entry, (unsigned char*) mask, h)) {
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if (!iptc_delete_entry(chain_pre, entry, (unsigned char*) mask, h)) {
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if (errno != ENOENT)
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return -errno;
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}
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@ -336,7 +338,7 @@ int fw_add_local_dnat(
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entry->ip.invflags = IPT_INV_DSTIP;
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}
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if (!iptc_delete_entry("OUTPUT", entry, (unsigned char*) mask, h)) {
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if (!iptc_delete_entry(chain_output, entry, (unsigned char*) mask, h)) {
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if (errno != ENOENT)
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return -errno;
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}
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