--- /dev/null
+From d559314e3e3debe1ff8c2c1372701df6154a53ef Mon Sep 17 00:00:00 2001
+From: Steven Barth <steven@midlink.org>
+Date: Mon, 15 Dec 2014 10:13:39 +0100
+Subject: [PATCH 2/3] build: make nftables usable with mini-gmp
+
+libgmp usually compiles to >400KB which can put a burden on embedded
+device firmware especially if libgmp isn't used for other purposes.
+mini-gmp in contrast adds only ~30KB to the nft-binary itself.
+
+However mini-gmp does not support gmp_sscanf and gmp_printf.
+
+This patch:
+* Adds a configure flag --without-libgmp to select mini-gmp
+* Replaces the single gmp_sscanf occurence with mpz_set_str
+* Replaces calls to gmp_printf outside of pr_debug with
+ a minimalistic mpz_printf usable to format one mpz_t
+* Replaces gmp_vasprintf in erec_vcreate with vasprintf
+ and rewrites the single user of the gmp format-flags
+* Changes the parser token VERSION to IPHDRVERSION to avoid
+ clashes with the VERSION-define in config.h
+
+Signed-off-by: Steven Barth <cyrus@openwrt.org>
+---
+ configure.ac | 17 ++++++++++++++---
+ include/expression.h | 2 +-
+ include/gmputil.h | 10 ++++++++++
+ include/utils.h | 3 +--
+ src/Makefile.am | 4 ++++
+ src/ct.c | 2 +-
+ src/datatype.c | 8 +++-----
+ src/erec.c | 6 +++++-
+ src/evaluate.c | 8 ++++++--
+ src/gmputil.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++-
+ src/parser_bison.y | 6 +++---
+ src/scanner.l | 2 +-
+ 12 files changed, 102 insertions(+), 20 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index b55b2b1..1e3729d 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -73,8 +73,18 @@ AM_CONDITIONAL([BUILD_PDF], [test "$DBLATEX" == "found"])
+ PKG_CHECK_MODULES([LIBMNL], [libmnl >= 1.0.3])
+ PKG_CHECK_MODULES([LIBNFTNL], [libnftnl >= 1.0.2])
+
+-AC_CHECK_LIB([gmp], [__gmpz_init], ,
+- AC_MSG_ERROR([No suitable version of libgmp found]))
++AC_ARG_WITH([libgmp], [AS_HELP_STRING([--without-libgmp],
++ [Disable libgmp support (use builtin mini-gmp)])], [],
++ [with_libgmp=yes])
++AS_IF([test "x$with_libgmp" != xno], [
++AC_CHECK_LIB([gmp],[__gmpz_init], , AC_MSG_ERROR([No suitable version of libgmp found]))
++])
++AM_CONDITIONAL([BUILD_MINIGMP], [test "x$with_libgmp" == xno])
++
++
++AS_IF([test "x$with_libgmp" != xyes -a "x$CONFIG_DEBUG" = xy], [
++AC_MSG_ERROR([--without-libgmp MUST be used with --disable-debug])
++])
+
+ AC_ARG_WITH([cli], [AS_HELP_STRING([--without-cli],
+ [disable interactive CLI (libreadline support)])],
+@@ -130,4 +140,5 @@ AC_OUTPUT
+ echo "
+ nft configuration:
+ cli support: ${with_cli}
+- enable debugging: ${with_debug}"
++ enable debugging: ${with_debug}
++ use shared libgmp: ${with_libgmp}"
+diff --git a/include/expression.h b/include/expression.h
+index 4b96879..7477c3e 100644
+--- a/include/expression.h
++++ b/include/expression.h
+@@ -2,7 +2,7 @@
+ #define NFTABLES_EXPRESSION_H
+
+ #include <stdbool.h>
+-#include <gmp.h>
++#include <gmputil.h>
+ #include <linux/netfilter/nf_tables.h>
+
+ #include <nftables.h>
+diff --git a/include/gmputil.h b/include/gmputil.h
+index 63eb0ba..b9ced6d 100644
+--- a/include/gmputil.h
++++ b/include/gmputil.h
+@@ -1,9 +1,17 @@
+ #ifndef NFTABLES_GMPUTIL_H
+ #define NFTABLES_GMPUTIL_H
+
++#include <config.h>
++
++#ifdef HAVE_LIBGMP
+ #include <gmp.h>
++#else
++#include <mini-gmp.h>
++#endif
++
+ #include <asm/byteorder.h>
+
++
+ enum mpz_word_order {
+ MPZ_MSWF = 1,
+ MPZ_LSWF = -1,
+@@ -48,4 +56,6 @@ extern void mpz_import_data(mpz_t rop, const void *data,
+ unsigned int len);
+ extern void mpz_switch_byteorder(mpz_t rop, unsigned int len);
+
++extern int mpz_printf(const char *format, const mpz_t value);
++
+ #endif /* NFTABLES_GMPUTIL_H */
+diff --git a/include/utils.h b/include/utils.h
+index 15b2e39..3c436ba 100644
+--- a/include/utils.h
++++ b/include/utils.h
+@@ -9,14 +9,13 @@
+ #include <unistd.h>
+ #include <assert.h>
+ #include <list.h>
+-#include <gmp.h>
+
+ #define BITS_PER_BYTE 8
+
+ #ifdef DEBUG
+ #define pr_debug(fmt, arg...) gmp_printf(fmt, ##arg)
+ #else
+-#define pr_debug(fmt, arg...) ({ if (false) gmp_printf(fmt, ##arg); 0; })
++#define pr_debug(fmt, arg...) ({ if (false) {}; 0; })
+ #endif
+
+ #define __fmtstring(x, y) __attribute__((format(printf, x, y)))
+diff --git a/src/Makefile.am b/src/Makefile.am
+index 378424d..099052a 100644
+--- a/src/Makefile.am
++++ b/src/Makefile.am
+@@ -51,4 +51,8 @@ if BUILD_CLI
+ nft_SOURCES += cli.c
+ endif
+
++if BUILD_MINIGMP
++nft_SOURCES += mini-gmp.c
++endif
++
+ nft_LDADD = ${LIBMNL_LIBS} ${LIBNFTNL_LIBS}
+diff --git a/src/ct.c b/src/ct.c
+index 2eb85ea..759e65d 100644
+--- a/src/ct.c
++++ b/src/ct.c
+@@ -110,7 +110,7 @@ static void ct_label_type_print(const struct expr *expr)
+ return;
+ }
+ /* can happen when connlabel.conf is altered after rules were added */
+- gmp_printf("0x%Zx", expr->value);
++ mpz_printf("0x%Zx", expr->value);
+ }
+
+ static struct error_record *ct_label_type_parse(const struct expr *sym,
+diff --git a/src/datatype.c b/src/datatype.c
+index 4519d87..40ce898 100644
+--- a/src/datatype.c
++++ b/src/datatype.c
+@@ -186,7 +186,7 @@ void symbol_table_print(const struct symbol_table *tbl,
+
+ static void invalid_type_print(const struct expr *expr)
+ {
+- gmp_printf("0x%Zx [invalid type]", expr->value);
++ mpz_printf("0x%Zx [invalid type]", expr->value);
+ }
+
+ const struct datatype invalid_type = {
+@@ -268,18 +268,16 @@ static void integer_type_print(const struct expr *expr)
+
+ if (expr->dtype->basefmt != NULL)
+ fmt = expr->dtype->basefmt;
+- gmp_printf(fmt, expr->value);
++ mpz_printf(fmt, expr->value);
+ }
+
+ static struct error_record *integer_type_parse(const struct expr *sym,
+ struct expr **res)
+ {
+ mpz_t v;
+- int len;
+
+ mpz_init(v);
+- if (gmp_sscanf(sym->identifier, "%Zu%n", v, &len) != 1 ||
+- (int)strlen(sym->identifier) != len) {
++ if (mpz_set_str(v, sym->identifier, 0)) {
+ mpz_clear(v);
+ return error(&sym->location, "Could not parse %s",
+ sym->dtype->desc);
+diff --git a/src/erec.c b/src/erec.c
+index 82543e6..810e9bf 100644
+--- a/src/erec.c
++++ b/src/erec.c
+@@ -44,6 +44,7 @@ static void erec_destroy(struct error_record *erec)
+ xfree(erec);
+ }
+
++__attribute__((format(printf, 3, 0)))
+ struct error_record *erec_vcreate(enum error_record_types type,
+ const struct location *loc,
+ const char *fmt, va_list ap)
+@@ -55,10 +56,13 @@ struct error_record *erec_vcreate(enum error_record_types type,
+ erec->num_locations = 0;
+ erec_add_location(erec, loc);
+
+- gmp_vasprintf(&erec->msg, fmt, ap);
++ if (vasprintf(&erec->msg, fmt, ap) < 0)
++ erec->msg = NULL;
++
+ return erec;
+ }
+
++__attribute__((format(printf, 3, 4)))
+ struct error_record *erec_create(enum error_record_types type,
+ const struct location *loc,
+ const char *fmt, ...)
+diff --git a/src/evaluate.c b/src/evaluate.c
+index 0732660..3cb5cca 100644
+--- a/src/evaluate.c
++++ b/src/evaluate.c
+@@ -232,9 +232,13 @@ static int expr_evaluate_value(struct eval_ctx *ctx, struct expr **expr)
+ case TYPE_INTEGER:
+ mpz_init_bitmask(mask, ctx->ectx.len);
+ if (mpz_cmp((*expr)->value, mask) > 0) {
++ char *valstr = mpz_get_str(NULL, 10, (*expr)->value);
++ char *rangestr = mpz_get_str(NULL, 10, mask);
+ expr_error(ctx->msgs, *expr,
+- "Value %Zu exceeds valid range 0-%Zu",
+- (*expr)->value, mask);
++ "Value %s exceeds valid range 0-%s",
++ valstr, rangestr);
++ free(valstr);
++ free(rangestr);
+ mpz_clear(mask);
+ return -1;
+ }
+diff --git a/src/gmputil.c b/src/gmputil.c
+index cb46445..acbf369 100644
+--- a/src/gmputil.c
++++ b/src/gmputil.c
+@@ -14,7 +14,6 @@
+ #include <stdio.h>
+ #include <unistd.h>
+ #include <string.h>
+-#include <gmp.h>
+
+ #include <nftables.h>
+ #include <datatype.h>
+@@ -148,6 +147,59 @@ void mpz_switch_byteorder(mpz_t rop, unsigned int len)
+ mpz_import_data(rop, data, BYTEORDER_HOST_ENDIAN, len);
+ }
+
++int mpz_printf(const char *f, const mpz_t value)
++{
++ /* minimalistic gmp_printf replacement to format a single mpz_t
++ * using only mini-gmp functions */
++ int n = 0;
++ while (*f) {
++ if (*f != '%') {
++ if (fputc(*f, stdout) != *f)
++ return -1;
++
++ ++n;
++ } else {
++ unsigned long prec = 0;
++ int base;
++ size_t len;
++ char *str;
++ bool ok;
++
++ if (*++f == '.')
++ prec = strtoul(++f, (char**)&f, 10);
++
++ if (*f++ != 'Z')
++ return -1;
++
++ if (*f == 'u')
++ base = 10;
++ else if (*f == 'x')
++ base = 16;
++ else
++ return -1;
++
++ len = mpz_sizeinbase(value, base);
++ while (prec-- > len) {
++ if (fputc('0', stdout) != '0')
++ return -1;
++
++ ++n;
++ }
++
++ str = mpz_get_str(NULL, base, value);
++ ok = str && fwrite(str, 1, len, stdout) == len;
++ free(str);
++
++ if (!ok)
++ return -1;
++
++ n += len;
++ }
++ ++f;
++ }
++ return n;
++}
++
+ static void *gmp_xrealloc(void *ptr, size_t old_size, size_t new_size)
+ {
+ return xrealloc(ptr, new_size);
+diff --git a/src/parser_bison.y b/src/parser_bison.y
+index 99dbd08..eb5cf90 100644
+--- a/src/parser_bison.y
++++ b/src/parser_bison.y
+@@ -237,7 +237,7 @@ static void location_update(struct location *loc, struct location *rhs, int n)
+ %token OPERATION "operation"
+
+ %token IP "ip"
+-%token VERSION "version"
++%token IPHDRVERSION "version"
+ %token HDRLENGTH "hdrlength"
+ %token TOS "tos"
+ %token LENGTH "length"
+@@ -1947,7 +1947,7 @@ ip_hdr_expr : IP ip_hdr_field
+ }
+ ;
+
+-ip_hdr_field : VERSION { $$ = IPHDR_VERSION; }
++ip_hdr_field : IPHDRVERSION { $$ = IPHDR_VERSION; }
+ | HDRLENGTH { $$ = IPHDR_HDRLENGTH; }
+ | TOS { $$ = IPHDR_TOS; }
+ | LENGTH { $$ = IPHDR_LENGTH; }
+@@ -1994,7 +1994,7 @@ ip6_hdr_expr : IP6 ip6_hdr_field
+ }
+ ;
+
+-ip6_hdr_field : VERSION { $$ = IP6HDR_VERSION; }
++ip6_hdr_field : IPHDRVERSION { $$ = IP6HDR_VERSION; }
+ | PRIORITY { $$ = IP6HDR_PRIORITY; }
+ | FLOWLABEL { $$ = IP6HDR_FLOWLABEL; }
+ | LENGTH { $$ = IP6HDR_LENGTH; }
+diff --git a/src/scanner.l b/src/scanner.l
+index ed87da6..92b6a10 100644
+--- a/src/scanner.l
++++ b/src/scanner.l
+@@ -349,7 +349,7 @@ addrstring ({macaddr}|{ip4addr}|{ip6addr})
+ "operation" { return OPERATION; }
+
+ "ip" { return IP; }
+-"version" { return VERSION; }
++"version" { return IPHDRVERSION; }
+ "hdrlength" { return HDRLENGTH; }
+ "tos" { return TOS; }
+ "length" { return LENGTH; }
+--
+2.1.3
+
projects / openwrt / staging / lynxis / omap.git / blobdiff