Mailing List Archive

Hi,


there is a small issue with debugging. A lot of modules (be it dynamic
or NO_SHARED_LIBS=1) use the same function names, which makes it
impossible for the debugger to select the right symbol to
print/set a breakpoint at. (It will choose whatever is in scope, or
random.) The 'solution' I'd come up with is to rename the overlapping
parts (opts, help, parse, final_check, print, save, _init) to be
unambiguous among the symbol space. Would such patch be considered?
Just asking so that I don't waste time :)

Jan
===
Example:

---
extensions/Makefile | 7 ++++-
extensions/libip6t_CONNMARK.c | 46 +++++++++++++++---------------------
extensions/libxt_udp.c | 53 +++++++++++++++++++-----------------------
include/xtables.h | 8 ++----
4 files changed, 53 insertions(+), 61 deletions(-)

Index: iptables/extensions/Makefile
===================================================================
--- iptables.orig/extensions/Makefile
+++ iptables/extensions/Makefile
@@ -132,7 +132,12 @@ extensions/initext6.c: extensions/Makefi
echo "}" >> $@

extensions/lib%.o: extensions/lib%.c
- $(CC) $(CFLAGS) -D_INIT=$*_init -c -o $@ $<
+ $(CC) $(CFLAGS) -D_init=$*_init -c -o $@ $<
+
+else
+
+extensions/lib%_sh.o: extensions/lib%.c
+ $(CC) $(CFLAGS) -D_init=$*_init -c -o $@ $<

endif

Index: iptables/extensions/libip6t_CONNMARK.c
===================================================================
--- iptables.orig/extensions/libip6t_CONNMARK.c
+++ iptables/extensions/libip6t_CONNMARK.c
@@ -36,8 +36,7 @@ struct markinfo {
#endif

/* Function which prints out usage message. */
-static void
-help(void)
+static void CONNMARK6_help(void)
{
printf(
"CONNMARK target v%s options:\n"
@@ -48,7 +47,7 @@ help(void)
IPTABLES_VERSION);
}

-static const struct option opts[] = {
+static const struct option CONNMARK6_opts[] = {
{ "set-mark", 1, 0, '1' },
{ "save-mark", 0, 0, '2' },
{ "restore-mark", 0, 0, '3' },
@@ -57,17 +56,15 @@ static const struct option opts[] = {
};

/* Initialize the target. */
-static void
-init(struct xt_entry_target *t, unsigned int *nfcache)
+static void CONNMARK6_init_data(struct xt_entry_target *t,
+ unsigned int *nfcache)
{
}

/* Function which parses command options; returns true if it
ate an option */
-static int
-parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry,
- struct xt_entry_target **target)
+static int CONNMARK6_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, struct xt_entry_target **target)
{
struct ipt_connmark_target_info *markinfo
= (struct ipt_connmark_target_info *)(*target)->data;
@@ -121,7 +118,7 @@ parse(int c, char **argv, int invert, un
}

static void
-final_check(unsigned int flags)
+CONNMARK6_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
@@ -143,10 +140,8 @@ print_mask(const char *text, unsigned lo


/* Prints out the target info. */
-static void
-print(const void *ip,
- const struct xt_entry_target *target,
- int numeric)
+static void CONNMARK6_print(const void *ip,
+ const struct xt_entry_target *target, int numeric)
{
const struct ipt_connmark_target_info *markinfo =
(const struct ipt_connmark_target_info *)target->data;
@@ -173,8 +168,7 @@ print(const void *ip,
}

/* Saves the target into in parsable form to stdout. */
-static void
-save(const void *ip, const struct xt_entry_target *target)
+static void CONNMARK6_save(const void *ip, const struct xt_entry_target *target)
{
const struct ipt_connmark_target_info *markinfo =
(const struct ipt_connmark_target_info *)target->data;
@@ -200,21 +194,21 @@ save(const void *ip, const struct xt_ent
}
}

-static struct ip6tables_target connmark_target = {
+static struct ip6tables_target CONNMARK6_reg = {
.name = "CONNMARK",
.version = IPTABLES_VERSION,
.size = IP6T_ALIGN(sizeof(struct ipt_connmark_target_info)),
.userspacesize = IP6T_ALIGN(sizeof(struct ipt_connmark_target_info)),
- .help = &help,
- .init = &init,
- .parse = &parse,
- .final_check = &final_check,
- .print = &print,
- .save = &save,
- .extra_opts = opts
+ .help = CONNMARK6_help,
+ .init = CONNMARK6_init_data,
+ .parse = CONNMARK6_parse,
+ .final_check = CONNMARK6_check,
+ .print = CONNMARK6_print,
+ .save = CONNMARK6_save,
+ .extra_opts = CONNMARK6_opts,
};

-void _init(void)
+init_static void _init(void)
{
- register_target6(&connmark_target);
+ register_target6(&CONNMARK6_reg);
}
Index: iptables/extensions/libxt_udp.c
===================================================================
--- iptables.orig/extensions/libxt_udp.c
+++ iptables/extensions/libxt_udp.c
@@ -8,8 +8,7 @@
#include <linux/netfilter/xt_tcpudp.h>

/* Function which prints out usage message. */
-static void
-help(void)
+static void udp_help(void)
{
printf(
"UDP v%s options:\n"
@@ -22,7 +21,7 @@ help(void)
IPTABLES_VERSION);
}

-static const struct option opts[] = {
+static const struct option udp_opts[] = {
{ "source-port", 1, 0, '1' },
{ "sport", 1, 0, '1' }, /* synonym */
{ "destination-port", 1, 0, '2' },
@@ -54,8 +53,7 @@ parse_udp_ports(const char *portstring,
}

/* Initialize the match. */
-static void
-init(struct xt_entry_match *m, unsigned int *nfcache)
+static void udp_init(struct xt_entry_match *m, unsigned int *nfcache)
{
struct xt_udp *udpinfo = (struct xt_udp *)m->data;

@@ -67,11 +65,9 @@ init(struct xt_entry_match *m, unsigned

/* Function which parses command options; returns true if it
ate an option */
-static int
-parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry,
- unsigned int *nfcache,
- struct xt_entry_match **match)
+static int udp_parse(int c, char **argv, int invert, unsigned int *flags,
+ const void *entry, unsigned int *nfcache,
+ struct xt_entry_match **match)
{
struct xt_udp *udpinfo = (struct xt_udp *)(*match)->data;

@@ -107,7 +103,7 @@ parse(int c, char **argv, int invert, un

/* Final check; we don't care. */
static void
-final_check(unsigned int flags)
+udp_check(unsigned int flags)
{
}

@@ -155,9 +151,8 @@ print_ports(const char *name, u_int16_t
}

/* Prints out the union ipt_matchinfo. */
-static void
-print(const void *ip,
- const struct xt_entry_match *match, int numeric)
+static void udp_print(const void *ip, const struct xt_entry_match *match,
+ int numeric)
{
const struct xt_udp *udp = (struct xt_udp *)match->data;

@@ -174,7 +169,7 @@ print(const void *ip,
}

/* Saves the union ipt_matchinfo in parsable form to stdout. */
-static void save(const void *ip, const struct xt_entry_match *match)
+static void udp_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_udp *udpinfo = (struct xt_udp *)match->data;

@@ -214,13 +209,13 @@ struct xtables_match udp = {
.version = IPTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_udp)),
.userspacesize = XT_ALIGN(sizeof(struct xt_udp)),
- .help = &help,
- .init = &init,
- .parse = &parse,
- .final_check = &final_check,
- .print = &print,
- .save = &save,
- .extra_opts = opts
+ .help = udp_help,
+ .init = udp_init,
+ .parse = udp_parse,
+ .final_check = udp_check,
+ .print = udp_print,
+ .save = udp_save,
+ .extra_opts = udp_opts,
};

static
@@ -230,13 +225,13 @@ struct xtables_match udp6 = {
.version = IPTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_udp)),
.userspacesize = XT_ALIGN(sizeof(struct xt_udp)),
- .help = &help,
- .init = &init,
- .parse = &parse,
- .final_check = &final_check,
- .print = &print,
- .save = &save,
- .extra_opts = opts
+ .help = udp_help,
+ .init = udp_init,
+ .parse = udp_parse,
+ .final_check = udp_check,
+ .print = udp_print,
+ .save = udp_save,
+ .extra_opts = udp_opts,
};

void
Index: iptables/include/xtables.h
===================================================================
--- iptables.orig/include/xtables.h
+++ iptables/include/xtables.h
@@ -230,13 +230,11 @@ void exit_error(enum exittype, char *, .
format(printf,2,3)));
extern const char *program_name, *program_version;

-#define _init __attribute__((constructor)) my_init
#ifdef NO_SHARED_LIBS
-# ifdef _INIT
-# undef _init
-# define _init _INIT
-# endif
+# define init_static
extern void init_extensions(void);
+#else
+# define init_static static __attribute__((constructor))
#endif

#define __be32 u_int32_t