forked from osmocom/wireshark
Don't use dladdr() to get a pathname for the current executable().
Change-Id: I24ad11a659c2cb936f873339dc2b36ac9944280a Reviewed-on: https://code.wireshark.org/review/27359 Petri-Dish: Guy Harris <guy@alum.mit.edu> Tested-by: Petri Dish Buildbot Reviewed-by: Guy Harris <guy@alum.mit.edu>
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41445d0e97
commit
15cfc41e94
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@ -1458,7 +1458,7 @@ main(int argc, char *argv[])
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], main);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL) {
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fprintf(stderr,
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"capinfos: Can't get pathname of directory containing the capinfos program: %s.\n",
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@ -134,7 +134,7 @@ main(int argc, char *argv[])
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], main);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL) {
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fprintf(stderr,
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"captype: Can't get pathname of directory containing the captype program: %s.\n",
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@ -53,9 +53,6 @@
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/* Define to use c-ares library */
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#cmakedefine HAVE_C_ARES 1
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/* Define to 1 if you have the `dladdr' function. */
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#cmakedefine HAVE_DLADDR 1
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/* Define to 1 if you have the <fcntl.h> header file. */
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#cmakedefine HAVE_FCNTL_H 1
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2
dftest.c
2
dftest.c
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@ -58,7 +58,7 @@ main(int argc, char **argv)
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], main);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL) {
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fprintf(stderr, "dftest: Can't get pathname of directory containing the dftest program: %s.\n",
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init_progfile_dir_error);
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@ -1021,7 +1021,7 @@ main(int argc, char *argv[])
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], main);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL) {
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fprintf(stderr,
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"editcap: Can't get pathname of directory containing the editcap program: %s.\n",
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@ -288,7 +288,7 @@ main(int argc, char *argv[])
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], main);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL) {
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fprintf(stderr,
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"mergecap: Can't get pathname of directory containing the mergecap program: %s.\n",
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@ -127,7 +127,7 @@ main(int argc, char **argv)
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], main);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL) {
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fprintf(stderr,
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"capinfos: Can't get pathname of directory containing the capinfos program: %s.\n",
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@ -486,7 +486,7 @@ main(int argc, char *argv[])
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], main);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL) {
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fprintf(stderr, "rawshark: Can't get pathname of rawshark program: %s.\n",
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init_progfile_dir_error);
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@ -222,7 +222,7 @@ main(int argc, char *argv[])
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], main);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL) {
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fprintf(stderr,
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"reordercap: Can't get pathname of directory containing the reordercap program: %s.\n",
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2
sharkd.c
2
sharkd.c
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@ -124,7 +124,7 @@ main(int argc, char *argv[])
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/*
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* Attempt to get the pathname of the executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], main);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL) {
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fprintf(stderr, "sharkd: Can't get pathname of sharkd program: %s.\n",
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init_progfile_dir_error);
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@ -378,7 +378,7 @@ main(int argc, char *argv[])
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], main);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL) {
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fprintf(stderr,
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"tfshark: Can't get pathname of directory containing the tfshark program: %s.\n",
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@ -234,7 +234,7 @@ fuzz_init(int argc _U_, char **argv)
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/*
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* Attempt to get the pathname of the executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], fuzz_init);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL)
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fprintf(stderr, "fuzzshark: Can't get pathname of oss-fuzzshark program: %s.\n", init_progfile_dir_error);
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2
tshark.c
2
tshark.c
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@ -783,7 +783,7 @@ main(int argc, char *argv[])
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], main);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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if (init_progfile_dir_error != NULL) {
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fprintf(stderr,
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"tshark: Can't get pathname of directory containing the tshark program: %s.\n"
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@ -2013,7 +2013,7 @@ main(int argc, char *argv[])
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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init_progfile_dir_error = init_progfile_dir(argv[0], main);
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init_progfile_dir_error = init_progfile_dir(argv[0]);
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/* initialize the funnel mini-api */
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initialize_funnel_ops();
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@ -422,8 +422,7 @@ int main(int argc, char *qt_argv[])
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* Attempt to get the pathname of the directory containing the
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* executable file.
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*/
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/* init_progfile_dir_error = */ init_progfile_dir(argv[0],
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(int (*)(int, char **)) get_gui_compiled_info);
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/* init_progfile_dir_error = */ init_progfile_dir(argv[0]);
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g_log(NULL, G_LOG_LEVEL_DEBUG, "progfile_dir: %s", get_progfile_dir());
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#ifdef _WIN32
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@ -10,13 +10,6 @@
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#include <config.h>
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/*
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* Required with GNU libc to get dladdr().
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* We define it here because <dlfcn.h> apparently gets included by
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* one of the headers we include below.
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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@ -273,15 +266,31 @@ static gboolean running_in_build_directory_flag = FALSE;
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* passed to the program, so it shouldn't be fooled by an argv[0]
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* that doesn't match the executable path.
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*
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* Sadly, not all UN*Xes necessarily have dladdr(), and those that
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* do don't necessarily have dladdr(main) return information about
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* the executable image, and those that do aren't necessarily running
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* on a platform wherein the executable image can get its own path
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* from the kernel (either by a call or by it being handed to it along
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* with argv[] and the environment), and those that can don't
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* necessarily use that to supply the path you get from dladdr(main),
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* so we try this first and, if that fails, use dladdr(main) if
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* available.
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* We don't use dladdr() because:
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*
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* not all UN*Xes necessarily have dladdr();
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*
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* those that do have it don't necessarily have dladdr(main)
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* return information about the executable image;
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*
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* those that do have a dladdr() where dladdr(main) returns
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* information about the executable image don't necessarily
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* have a mechanism by which the executable image can get
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* its own path from the kernel (either by a call or by it
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* being handed to it along with argv[] and the environment),
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* so they just fall back on getting it from argv[0], which we
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* already have code to do;
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*
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* those that do have such a mechanism don't necessarily use
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* it in dladdr(), and, instead, just fall back on getting it
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* from argv[0];
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*
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* so the only places where it's worth bothering to use dladdr()
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* are platforms where dladdr(main) return information about the
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* executable image by getting it from the kernel rather than
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* by looking at argv[0], and where we can't get at that information
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* ourselves, and we haven't seen any indication that there are any
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* such platforms.
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*
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* In particular, some dynamic linkers supply a dladdr() such that
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* dladdr(main) just returns something derived from argv[0], so
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* another mechanism that can get you a more reliable version of
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* the executable path.
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*
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* However, at least in newer versions of DragonFly BSD, the dynamic
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* linker *does* get it from the aux vector passed to the program
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* by the kernel, readlink /proc/curproc/file - which came first?
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*
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* On OpenBSD, dladdr(main) returns a value derived from argv[0],
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* and there doesn't appear to be any way to get the executable path
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* from the kernel, so we're out of luck there.
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*
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* So, on platforms where some versions have a version of dladdr()
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* that gives an argv[0]-based path and that also have a mechanism
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* to get a more reliable version of the path, we try that. On
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* other platforms, we return NULL. If our caller gets back a NULL
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* from us, it falls back on dladdr(main) if dladdr() is available,
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* and if that fails or is unavailable, it falls back on processing
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* argv[0] itself.
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* So, on platforms where we know of a mechanism to get that path
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* (where getting that path doesn't involve argv[0], which is not
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* guaranteed to reflect the path to the binary), this routine
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* attempsts to use that platform's mechanism. On other platforms,
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* it just returns NULL.
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*
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* This is not guaranteed to return an absolute path; if it doesn't,
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* our caller must prepend the current directory if it's a path.
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#ifdef _WIN32
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_U_
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#endif
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, int (*function_addr)(int, char **)
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#if defined(_WIN32) || !defined(HAVE_DLADDR)
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_U_
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#endif
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)
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{
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#ifdef _WIN32
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msg, error);
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}
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#else
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#ifdef HAVE_DLADDR
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Dl_info info;
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#endif
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const char *execname;
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char *prog_pathname;
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char *curdir;
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running_in_build_directory_flag = TRUE;
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execname = get_executable_path();
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#ifdef HAVE_DLADDR
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if (function_addr != NULL && execname == NULL) {
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/*
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* Try to use dladdr() to find the pathname of the executable.
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* dladdr() is not guaranteed to give you anything better than
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* argv[0] (i.e., it might not contain a / at all, much less
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* being an absolute path), and doesn't appear to do so on
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* Linux, but on other platforms it could give you an absolute
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* path and obviate the need for us to determine the absolute
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* path.
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*/
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DIAG_OFF(pedantic)
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if (dladdr((void *)function_addr, &info)) {
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DIAG_ON(pedantic)
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execname = info.dli_fname;
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}
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}
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#endif
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if (execname == NULL) {
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/*
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* OK, guess based on argv[0].
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@ -578,7 +552,7 @@ DIAG_ON(pedantic)
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/*
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* Try to figure out the directory in which the currently running
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* program resides, given something purporting to be the executable
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* name (from dladdr() or from the argv[0] it was started with.
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* name (from an OS mechanism or from the argv[0] it was started with).
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* That might be the absolute path of the program, or a path relative
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* to the current directory of the process that started it, or
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* just a name for the program if it was started from the command
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@ -29,7 +29,7 @@ extern "C" {
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* and save it for future use. Returns NULL on success, and a
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* g_mallocated string containing an error on failure.
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*/
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WS_DLL_PUBLIC char *init_progfile_dir(const char *arg0, int (*function_addr)(int, char **));
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WS_DLL_PUBLIC char *init_progfile_dir(const char *arg0);
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/*
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* Get the directory in which the program resides.
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