These functions contain code which occurs in legacy's print_firewall()
functions, so use them there.
Rename them to at least make clear they print more than a single
address.
Also introduce ipv{4,6}_addr_to_string() which take care of converting
an address/netmask pair into string representation in a way which
doesn't upset covscan (since that didn't detect that 'buf' may not be
exceeded by the strings written into it.
Signed-off-by: Phil Sutter <p...@nwl.cc>
---
iptables/ip6tables.c | 27 +-----------------
iptables/iptables.c | 25 +----------------
iptables/nft-ipv4.c | 32 +--------------------
iptables/nft-ipv6.c | 39 +-------------------------
iptables/xshared.c | 66 ++++++++++++++++++++++++++++++++++++++++++++
iptables/xshared.h | 3 ++
6 files changed, 73 insertions(+), 119 deletions(-)
diff --git a/iptables/ip6tables.c b/iptables/ip6tables.c
index 3bd1e5fade785..f5f73fe319595 100644
--- a/iptables/ip6tables.c
+++ b/iptables/ip6tables.c
@@ -550,7 +550,6 @@ print_firewall(const struct ip6t_entry *fw,
{
struct xtables_target *target, *tg;
const struct xt_entry_target *t;
- char buf[BUFSIZ];
if (!ip6tc_is_chain(targname, handle))
target = xtables_find_target(targname, XTF_TRY_LOAD);
@@ -618,31 +617,7 @@ print_firewall(const struct ip6t_entry *fw,
printf(FMT("%-6s ","out %s "), iface);
}
- fputc(fw->ipv6.invflags & IP6T_INV_SRCIP ? '!' : ' ', stdout);
- if (!memcmp(&fw->ipv6.smsk, &in6addr_any, sizeof in6addr_any)
- && !(format & FMT_NUMERIC))
- printf(FMT("%-19s ","%s "), "anywhere");
- else {
- if (format & FMT_NUMERIC)
- strcpy(buf, xtables_ip6addr_to_numeric(&fw->ipv6.src));
- else
- strcpy(buf, xtables_ip6addr_to_anyname(&fw->ipv6.src));
- strcat(buf, xtables_ip6mask_to_numeric(&fw->ipv6.smsk));
- printf(FMT("%-19s ","%s "), buf);
- }
-
- fputc(fw->ipv6.invflags & IP6T_INV_DSTIP ? '!' : ' ', stdout);
- if (!memcmp(&fw->ipv6.dmsk, &in6addr_any, sizeof in6addr_any)
- && !(format & FMT_NUMERIC))
- printf(FMT("%-19s ","-> %s"), "anywhere");
- else {
- if (format & FMT_NUMERIC)
- strcpy(buf, xtables_ip6addr_to_numeric(&fw->ipv6.dst));
- else
- strcpy(buf, xtables_ip6addr_to_anyname(&fw->ipv6.dst));
- strcat(buf, xtables_ip6mask_to_numeric(&fw->ipv6.dmsk));
- printf(FMT("%-19s ","-> %s"), buf);
- }
+ print_ipv6_addresses(fw, format);
if (format & FMT_NOTABLE)
fputs(" ", stdout);
diff --git a/iptables/iptables.c b/iptables/iptables.c
index 428fae4edb463..31cb97b2ee7fa 100644
--- a/iptables/iptables.c
+++ b/iptables/iptables.c
@@ -535,7 +535,6 @@ print_firewall(const struct ipt_entry *fw,
struct xtables_target *target, *tg;
const struct xt_entry_target *t;
uint8_t flags;
- char buf[BUFSIZ];
if (!iptc_is_chain(targname, handle))
target = xtables_find_target(targname, XTF_TRY_LOAD);
@@ -604,29 +603,7 @@ print_firewall(const struct ipt_entry *fw,
printf(FMT("%-6s ","out %s "), iface);
}
- fputc(fw->ip.invflags & IPT_INV_SRCIP ? '!' : ' ', stdout);
- if (fw->ip.smsk.s_addr == 0L && !(format & FMT_NUMERIC))
- printf(FMT("%-19s ","%s "), "anywhere");
- else {
- if (format & FMT_NUMERIC)
- strcpy(buf, xtables_ipaddr_to_numeric(&fw->ip.src));
- else
- strcpy(buf, xtables_ipaddr_to_anyname(&fw->ip.src));
- strcat(buf, xtables_ipmask_to_numeric(&fw->ip.smsk));
- printf(FMT("%-19s ","%s "), buf);
- }
-
- fputc(fw->ip.invflags & IPT_INV_DSTIP ? '!' : ' ', stdout);
- if (fw->ip.dmsk.s_addr == 0L && !(format & FMT_NUMERIC))
- printf(FMT("%-19s ","-> %s"), "anywhere");
- else {
- if (format & FMT_NUMERIC)
- strcpy(buf, xtables_ipaddr_to_numeric(&fw->ip.dst));
- else
- strcpy(buf, xtables_ipaddr_to_anyname(&fw->ip.dst));
- strcat(buf, xtables_ipmask_to_numeric(&fw->ip.dmsk));
- printf(FMT("%-19s ","-> %s"), buf);
- }
+ print_ipv4_addresses(fw, format);
if (format & FMT_NOTABLE)
fputs(" ", stdout);
diff --git a/iptables/nft-ipv4.c b/iptables/nft-ipv4.c
index 2d1bd10e30aaa..20ed9428425dd 100644
--- a/iptables/nft-ipv4.c
+++ b/iptables/nft-ipv4.c
@@ -255,36 +255,6 @@ static void nft_ipv4_parse_immediate(const char *jumpto,
bool nft_goto,
cs->fw.ip.flags |= IPT_F_GOTO;
}
-static void print_ipv4_addr(const struct iptables_command_state *cs,
- unsigned int format)
-{
- char buf[BUFSIZ];
-
- fputc(cs->fw.ip.invflags & IPT_INV_SRCIP ? '!' : ' ', stdout);
- if (cs->fw.ip.smsk.s_addr == 0L && !(format & FMT_NUMERIC))
- printf(FMT("%-19s ","%s "), "anywhere");
- else {
- if (format & FMT_NUMERIC)
- strcpy(buf, xtables_ipaddr_to_numeric(&cs->fw.ip.src));
- else
- strcpy(buf, xtables_ipaddr_to_anyname(&cs->fw.ip.src));
- strcat(buf, xtables_ipmask_to_numeric(&cs->fw.ip.smsk));
- printf(FMT("%-19s ","%s "), buf);
- }
-
- fputc(cs->fw.ip.invflags & IPT_INV_DSTIP ? '!' : ' ', stdout);
- if (cs->fw.ip.dmsk.s_addr == 0L && !(format & FMT_NUMERIC))
- printf(FMT("%-19s ","-> %s"), "anywhere");
- else {
- if (format & FMT_NUMERIC)
- strcpy(buf, xtables_ipaddr_to_numeric(&cs->fw.ip.dst));
- else
- strcpy(buf, xtables_ipaddr_to_anyname(&cs->fw.ip.dst));
- strcat(buf, xtables_ipmask_to_numeric(&cs->fw.ip.dmsk));
- printf(FMT("%-19s ","-> %s"), buf);
- }
-}
-
static void print_fragment(unsigned int flags, unsigned int invflags,
unsigned int format)
{
@@ -310,7 +280,7 @@ static void nft_ipv4_print_rule(struct nftnl_rule *r,
unsigned int num,
print_fragment(cs.fw.ip.flags, cs.fw.ip.invflags, format);
print_ifaces(cs.fw.ip.iniface, cs.fw.ip.outiface, cs.fw.ip.invflags,
format);
- print_ipv4_addr(&cs, format);
+ print_ipv4_addresses(&cs.fw, format);
if (format & FMT_NOTABLE)
fputs(" ", stdout);
diff --git a/iptables/nft-ipv6.c b/iptables/nft-ipv6.c
index b1b20ba18d868..1952164e199b9 100644
--- a/iptables/nft-ipv6.c
+++ b/iptables/nft-ipv6.c
@@ -191,43 +191,6 @@ static void nft_ipv6_parse_immediate(const char *jumpto,
bool nft_goto,
cs->fw6.ipv6.flags |= IP6T_F_GOTO;
}
-static void print_ipv6_addr(const struct iptables_command_state *cs,
- unsigned int format)
-{
- char buf[BUFSIZ];
-
- fputc(cs->fw6.ipv6.invflags & IP6T_INV_SRCIP ? '!' : ' ', stdout);
- if (IN6_IS_ADDR_UNSPECIFIED(&cs->fw6.ipv6.src)
- && !(format & FMT_NUMERIC))
- printf(FMT("%-19s ","%s "), "anywhere");
- else {
- if (format & FMT_NUMERIC)
- strcpy(buf,
- xtables_ip6addr_to_numeric(&cs->fw6.ipv6.src));
- else
- strcpy(buf,
- xtables_ip6addr_to_anyname(&cs->fw6.ipv6.src));
- strcat(buf, xtables_ip6mask_to_numeric(&cs->fw6.ipv6.smsk));
- printf(FMT("%-19s ","%s "), buf);
- }
-
-
- fputc(cs->fw6.ipv6.invflags & IP6T_INV_DSTIP ? '!' : ' ', stdout);
- if (IN6_IS_ADDR_UNSPECIFIED(&cs->fw6.ipv6.dst)
- && !(format & FMT_NUMERIC))
- printf(FMT("%-19s ","-> %s"), "anywhere");
- else {
- if (format & FMT_NUMERIC)
- strcpy(buf,
- xtables_ip6addr_to_numeric(&cs->fw6.ipv6.dst));
- else
- strcpy(buf,
- xtables_ip6addr_to_anyname(&cs->fw6.ipv6.dst));
- strcat(buf, xtables_ip6mask_to_numeric(&cs->fw6.ipv6.dmsk));
- printf(FMT("%-19s ","-> %s"), buf);
- }
-}
-
static void nft_ipv6_print_rule(struct nftnl_rule *r, unsigned int num,
unsigned int format)
{
@@ -245,7 +208,7 @@ static void nft_ipv6_print_rule(struct nftnl_rule *r,
unsigned int num,
}
print_ifaces(cs.fw6.ipv6.iniface, cs.fw6.ipv6.outiface,
cs.fw6.ipv6.invflags, format);
- print_ipv6_addr(&cs, format);
+ print_ipv6_addresses(&cs.fw6, format);
if (format & FMT_NOTABLE)
fputs(" ", stdout);
diff --git a/iptables/xshared.c b/iptables/xshared.c
index 492e008737956..d30e723254570 100644
--- a/iptables/xshared.c
+++ b/iptables/xshared.c
@@ -502,3 +502,69 @@ void add_param_to_argv(char *parsestart, int line)
param_len = 0;
}
}
+
+static const char *ipv4_addr_to_string(const struct in_addr *addr,
+ const struct in_addr *mask,
+ unsigned int format)
+{
+ static char buf[BUFSIZ];
+
+ if (!mask->s_addr && !(format & FMT_NUMERIC))
+ return "anywhere";
+
+ if (format & FMT_NUMERIC)
+ strncpy(buf, xtables_ipaddr_to_numeric(addr), BUFSIZ - 1);
+ else
+ strncpy(buf, xtables_ipaddr_to_anyname(addr), BUFSIZ - 1);
+ buf[BUFSIZ - 1] = '\0';
+
+ strncat(buf, xtables_ipmask_to_numeric(mask),
+ BUFSIZ - strlen(buf) - 1);
+
+ return buf;
+}
+
+void print_ipv4_addresses(const struct ipt_entry *fw, unsigned int format)
+{
+ fputc(fw->ip.invflags & IPT_INV_SRCIP ? '!' : ' ', stdout);
+ printf(FMT("%-19s ", "%s "),
+ ipv4_addr_to_string(&fw->ip.src, &fw->ip.smsk, format));
+
+ fputc(fw->ip.invflags & IPT_INV_DSTIP ? '!' : ' ', stdout);
+ printf(FMT("%-19s ", "-> %s"),
+ ipv4_addr_to_string(&fw->ip.dst, &fw->ip.dmsk, format));
+}
+
+static const char *ipv6_addr_to_string(const struct in6_addr *addr,
+ const struct in6_addr *mask,
+ unsigned int format)
+{
+ static char buf[BUFSIZ];
+
+ if (IN6_IS_ADDR_UNSPECIFIED(addr) && !(format & FMT_NUMERIC))
+ return "anywhere";
+
+ if (format & FMT_NUMERIC)
+ strncpy(buf, xtables_ip6addr_to_numeric(addr), BUFSIZ - 1);
+ else
+ strncpy(buf, xtables_ip6addr_to_anyname(addr), BUFSIZ - 1);
+ buf[BUFSIZ - 1] = '\0';
+
+ strncat(buf, xtables_ip6mask_to_numeric(mask),
+ BUFSIZ - strlen(buf) - 1);
+
+ return buf;
+}
+
+void print_ipv6_addresses(const struct ip6t_entry *fw6, unsigned int format)
+{
+ fputc(fw6->ipv6.invflags & IP6T_INV_SRCIP ? '!' : ' ', stdout);
+ printf(FMT("%-19s ", "%s "),
+ ipv6_addr_to_string(&fw6->ipv6.src,
+ &fw6->ipv6.smsk, format));
+
+ fputc(fw6->ipv6.invflags & IP6T_INV_DSTIP ? '!' : ' ', stdout);
+ printf(FMT("%-19s ", "-> %s"),
+ ipv6_addr_to_string(&fw6->ipv6.dst,
+ &fw6->ipv6.dmsk, format));
+}
diff --git a/iptables/xshared.h b/iptables/xshared.h
index 801d0f7564dc4..cb6f761d8afa1 100644
--- a/iptables/xshared.h
+++ b/iptables/xshared.h
@@ -168,4 +168,7 @@ void free_argv(void);
void save_argv(void);
void add_param_to_argv(char *parsestart, int line);
+void print_ipv4_addresses(const struct ipt_entry *fw, unsigned int format);
+void print_ipv6_addresses(const struct ip6t_entry *fw6, unsigned int format);
+
#endif /* IPTABLES_XSHARED_H */
--
2.18.0
