Initial commit

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

.gitignore

+*.log
+*.o
+*.tar.xz
+.deps/
+.libs/
+Makefile
+Makefile.in
+/aclocal.m4
+/autom4te.cache
+/build-aux
+/config.*
+/configure
+/libtool
+/stamp-h1

COPYING

+                  GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 2.1, February 1999
+
+ Copyright (C) 1991, 1999 Free Software Foundation, Inc.
+     51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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+That's all there is to it!

Makefile.am

+EXTRA_DIST =
+CLEANFILES =
+ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
+AM_MAKEFLAGS = --no-print-directory
+
+AM_CPPFLAGS = \
+	-include $(top_builddir)/config.h \
+	-DSYSCONFDIR=\""$(sysconfdir)"\" \
+	-I${top_srcdir}/src
+
+AM_CFLAGS = ${my_CFLAGS} \
+	-fvisibility=hidden \
+	-ffunction-sections \
+	-fdata-sections
+
+AM_LDFLAGS = \
+	-Wl,--gc-sections \
+	-Wl,--as-needed
+
+LIBLOC_CURRENT=0
+LIBLOC_REVISION=0
+LIBLOC_AGE=0
+
+SED_PROCESS = \
+	$(AM_V_GEN)$(MKDIR_P) $(dir $@) && $(SED) \
+	-e 's,@VERSION\@,$(VERSION),g' \
+	-e 's,@prefix\@,$(prefix),g' \
+	-e 's,@exec_prefix\@,$(exec_prefix),g' \
+	-e 's,@libdir\@,$(libdir),g' \
+	-e 's,@includedir\@,$(includedir),g' \
+	< $< > $@ || rm $@
+
+pkgconfigdir = $(libdir)/pkgconfig
+
+%.pc: %.pc.in Makefile
+	$(SED_PROCESS)
+
+pkginclude_HEADERS = \
+	src/loc/libloc.h
+
+lib_LTLIBRARIES = \
+	src/libloc.la
+
+src_libloc_la_SOURCES =\
+	src/libloc-private.h \
+	src/libloc.c
+
+EXTRA_DIST += src/libloc.sym
+
+src_libloc_la_LDFLAGS = \
+	$(AM_LDFLAGS) \
+	-version-info $(LIBLOC_CURRENT):$(LIBLOC_REVISION):$(LIBLOC_AGE) \
+	-Wl,--version-script=$(top_srcdir)/src/libloc.sym
+
+src_libloc_la_DEPENDENCIES = \
+	${top_srcdir}/src/libloc.sym
+
+pkgconfig_DATA = \
+	src/libloc.pc
+
+EXTRA_DIST += \
+	src/libloc.pc.in
+
+CLEANFILES += \
+	src/libloc.pc
+
+TESTS = \
+	src/test-libloc
+
+check_PROGRAMS = \
+	src/test-libloc
+
+src_test_libloc_SOURCES = \
+	src/test-libloc.c
+
+src_test_libloc_LDADD = \
+	src/libloc.la

autogen.sh

+#!/bin/sh
+
+set -e
+
+if [ -f .git/hooks/pre-commit.sample -a ! -f .git/hooks/pre-commit ] ; then
+        cp -p .git/hooks/pre-commit.sample .git/hooks/pre-commit && \
+        chmod +x .git/hooks/pre-commit && \
+        echo "Activated pre-commit hook."
+fi
+
+autoreconf --install --symlink
+
+libdir() {
+        echo $(cd $1/$(gcc -print-multi-os-directory); pwd)
+}
+
+args="--prefix=/usr \
+--sysconfdir=/etc \
+--libdir=$(libdir /usr/lib)"
+
+echo
+echo "----------------------------------------------------------------"
+echo "Initialized build system. For a common configuration please run:"
+echo "----------------------------------------------------------------"
+echo
+echo "./configure CFLAGS='-g -O0' $args"
+echo

configure.ac

+AC_PREREQ(2.60)
+AC_INIT([libloc],
+        [0],
+        [michael.tremer@ipfire.org],
+        [libloc],
+        [https://www.ipfire.org/])
+
+AC_CONFIG_SRCDIR([src/libloc.c])
+AC_CONFIG_AUX_DIR([build-aux])
+AM_INIT_AUTOMAKE([
+	foreign
+	1.11
+	-Wall
+	-Wno-portability
+	silent-rules
+	tar-pax
+	no-dist-gzip
+	dist-xz
+	subdir-objects
+])
+AC_PROG_CC_STDC
+AC_USE_SYSTEM_EXTENSIONS
+AC_SYS_LARGEFILE
+AC_CONFIG_MACRO_DIR([m4])
+AM_SILENT_RULES([yes])
+LT_INIT([
+	disable-static
+	pic-only
+])
+AC_PREFIX_DEFAULT([/usr])
+
+AC_PROG_SED
+AC_PROG_MKDIR_P
+
+AC_ARG_ENABLE([debug],
+        AS_HELP_STRING([--enable-debug], [enable debug messages @<:@default=disabled@:>@]),
+        [], [enable_debug=no])
+AS_IF([test "x$enable_debug" = "xyes"], [
+        AC_DEFINE(ENABLE_DEBUG, [1], [Debug messages.])
+])
+
+AC_CHECK_FUNCS([ \
+	__secure_getenv \
+	secure_getenv\
+])
+
+my_CFLAGS="\
+-Wall \
+-Wchar-subscripts \
+-Wformat-security \
+-Wmissing-declarations \
+-Wmissing-prototypes \
+-Wnested-externs \
+-Wpointer-arith \
+-Wshadow \
+-Wsign-compare \
+-Wstrict-prototypes \
+-Wtype-limits \
+"
+AC_SUBST([my_CFLAGS])
+
+AC_CONFIG_HEADERS(config.h)
+AC_CONFIG_FILES([
+        Makefile
+])
+
+AC_OUTPUT
+AC_MSG_RESULT([
+        $PACKAGE $VERSION
+        =====
+
+        prefix:                 ${prefix}
+        sysconfdir:             ${sysconfdir}
+        libdir:                 ${libdir}
+        includedir:             ${includedir}
+
+        compiler:               ${CC}
+        cflags:                 ${CFLAGS}
+        ldflags:                ${LDFLAGS}
+
+        logging:                ${enable_logging}
+        debug:                  ${enable_debug}
+])

m4/.gitignore

+libtool.m4
+ltoptions.m4
+ltsugar.m4
+ltversion.m4
+lt~obsolete.m4

src/.gitignore

+.dirstamp
+.deps/
+.libs/
+*.la
+*.lo
+*.trs
+libloc.pc
+test-libloc

src/libloc-private.h

+/*
+	libloc - A library to determine the location of someone on the Internet
+
+	Copyright (C) 2017 IPFire Development Team <info@ipfire.org>
+
+	This library is free software; you can redistribute it and/or
+	modify it under the terms of the GNU Lesser General Public
+	License as published by the Free Software Foundation; either
+	version 2.1 of the License, or (at your option) any later version.
+
+	This library is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+	Lesser General Public License for more details.
+*/
+
+#ifndef LIBLOC_PRIVATE_H
+#define LIBLOC_PRIVATE_H
+
+#include <stdbool.h>
+#include <syslog.h>
+
+#include <loc/libloc.h>
+
+static inline void __attribute__((always_inline, format(printf, 2, 3)))
+loc_log_null(struct loc_ctx *ctx, const char *format, ...) {}
+
+#define loc_log_cond(ctx, prio, arg...) \
+	do { \
+		if (loc_get_log_priority(ctx) >= prio) \
+			loc_log(ctx, prio, __FILE__, __LINE__, __FUNCTION__, ## arg); \
+	} while (0)
+
+#ifdef ENABLE_DEBUG
+#  define DEBUG(ctx, arg...) loc_log_cond(ctx, LOG_DEBUG, ## arg)
+#else
+#  define DEBUG(ctx, arg...) loc_log_null(ctx, ## arg)
+#endif
+
+#define INFO(ctx, arg...) loc_log_cond(ctx, LOG_INFO, ## arg)
+#define ERROR(ctx, arg...) loc_log_cond(ctx, LOG_ERR, ## arg)
+
+#ifndef HAVE_SECURE_GETENV
+#  ifdef HAVE___SECURE_GETENV
+#    define secure_getenv __secure_getenv
+#  else
+#    error neither secure_getenv nor __secure_getenv is available
+#  endif
+#endif
+
+#define LOC_EXPORT __attribute__ ((visibility("default")))
+
+void loc_log(struct loc_ctx *ctx,
+	int priority, const char *file, int line, const char *fn,
+	const char *format, ...) __attribute__((format(printf, 6, 7)));
+
+#endif

src/libloc.c

+/*
+	libloc - A library to determine the location of someone on the Internet
+
+	Copyright (C) 2017 IPFire Development Team <info@ipfire.org>
+
+	This library is free software; you can redistribute it and/or
+	modify it under the terms of the GNU Lesser General Public
+	License as published by the Free Software Foundation; either
+	version 2.1 of the License, or (at your option) any later version.
+
+	This library is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+	Lesser General Public License for more details.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <loc/libloc.h>
+#include "libloc-private.h"
+
+struct loc_ctx {
+	int refcount;
+	void (*log_fn)(struct loc_ctx* ctx,
+		int priority, const char *file, int line, const char *fn,
+		const char *format, va_list args);
+	int log_priority;
+};
+
+void loc_log(struct loc_ctx* ctx,
+		int priority, const char* file, int line, const char* fn,
+		const char* format, ...) {
+	va_list args;
+
+	va_start(args, format);
+	ctx->log_fn(ctx, priority, file, line, fn, format, args);
+	va_end(args);
+}
+
+static void log_stderr(struct loc_ctx* ctx,
+		int priority, const char* file, int line, const char* fn,
+		const char* format, va_list args) {
+	fprintf(stderr, "libloc: %s: ", fn);
+	vfprintf(stderr, format, args);
+}
+
+static int log_priority(const char* priority) {
+	char *endptr;
+
+	int prio = strtol(priority, &endptr, 10);
+
+	if (endptr[0] == '\0' || isspace(endptr[0]))
+		return prio;
+
+	if (strncmp(priority, "err", 3) == 0)
+		return LOG_ERR;
+
+	if (strncmp(priority, "info", 4) == 0)
+		return LOG_INFO;
+
+	if (strncmp(priority, "debug", 5) == 0)
+		return LOG_DEBUG;
+
+	return 0;
+}
+
+LOC_EXPORT int loc_new(struct loc_ctx** ctx) {
+	struct loc_ctx* c = calloc(1, sizeof(*c));
+	if (!c)
+		return -ENOMEM;
+
+	c->refcount = 1;
+	c->log_fn = log_stderr;
+	c->log_priority = LOG_ERR;
+
+	const char* env = secure_getenv("LOC_LOG");
+	if (env)
+		loc_set_log_priority(c, log_priority(env));
+
+	INFO(c, "ctx %p created\n", c);
+	DEBUG(c, "log_priority=%d\n", c->log_priority);
+	*ctx = c;
+
+	return 0;
+}
+
+LOC_EXPORT struct loc_ctx* loc_ref(struct loc_ctx* ctx) {
+	if (!ctx)
+		return NULL;
+
+	ctx->refcount++;
+
+	return ctx;
+}
+
+LOC_EXPORT struct loc_ctx* loc_unref(struct loc_ctx* ctx) {
+	if (!ctx)
+		return NULL;
+
+	if (--ctx->refcount > 0)
+		return NULL;
+
+	INFO(ctx, "context %p released\n", ctx);
+	free(ctx);
+
+	return NULL;
+}
+
+LOC_EXPORT void loc_set_log_fn(struct loc_ctx* ctx,
+		void (*log_fn)(struct loc_ctx* ctx, int priority, const char* file,
+		int line, const char* fn, const char* format, va_list args)) {
+	ctx->log_fn = log_fn;
+	INFO(ctx, "custom logging function %p registered\n", log_fn);
+}
+
+LOC_EXPORT int loc_get_log_priority(struct loc_ctx* ctx) {
+	return ctx->log_priority;
+}
+
+LOC_EXPORT void loc_set_log_priority(struct loc_ctx* ctx, int priority) {
+	ctx->log_priority = priority;
+}

src/libloc.pc.in

+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libloc
+Description: A library to determine the location of someone on the Internet
+Version: @VERSION@
+Libs: -L${libdir} -lloc
+Libs.private:
+Cflags: -I${includedir}

src/libloc.sym

+LIBLOC_1 {
+global:
+	loc_ref;
+	loc_get_log_priority;
+	loc_set_log_fn;
+	loc_unref;
+	loc_set_log_priority;
+	loc_new;
+local:
+	*;
+};

src/loc/libloc.h

+/*
+	libloc - A library to determine the location of someone on the Internet
+
+	Copyright (C) 2017 IPFire Development Team <info@ipfire.org>
+
+	This library is free software; you can redistribute it and/or
+	modify it under the terms of the GNU Lesser General Public
+	License as published by the Free Software Foundation; either
+	version 2.1 of the License, or (at your option) any later version.
+
+	This library is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+	Lesser General Public License for more details.
+*/
+
+#ifndef LIBLOC_H
+#define LIBLOC_H
+
+#include <stdarg.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct loc_ctx;
+struct loc_ctx *loc_ref(struct loc_ctx* ctx);
+struct loc_ctx *loc_unref(struct loc_ctx* ctx);
+
+int loc_new(struct loc_ctx** ctx);
+void loc_set_log_fn(struct loc_ctx* ctx,
+	void (*log_fn)(struct loc_ctx* ctx,
+	int priority, const char* file, int line, const char* fn,
+	const char* format, va_list args));
+int loc_get_log_priority(struct loc_ctx* ctx);
+void loc_set_log_priority(struct loc_ctx* ctx, int priority);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif

src/test-libloc.c

+/*
+	libloc - A library to determine the location of someone on the Internet
+
+	Copyright (C) 2017 IPFire Development Team <info@ipfire.org>
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+*/
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <loc/libloc.h>
+
+int main(int argc, char** argv) {
+	struct loc_ctx *ctx;
+
+	int err = loc_new(&ctx);
+	if (err < 0)
+		exit(EXIT_FAILURE);
+
+	printf("version %s\n", VERSION);
+
+	loc_unref(ctx);
+	return EXIT_SUCCESS;
+}