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-rw-r--r--REORG.TODO/elf/pldd.c344
1 files changed, 344 insertions, 0 deletions
diff --git a/REORG.TODO/elf/pldd.c b/REORG.TODO/elf/pldd.c
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+++ b/REORG.TODO/elf/pldd.c
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+/* List dynamic shared objects linked into given process.
+ Copyright (C) 2011-2017 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
+
+ The GNU C 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.
+
+ The GNU C 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.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <alloca.h>
+#include <argp.h>
+#include <assert.h>
+#include <dirent.h>
+#include <elf.h>
+#include <errno.h>
+#include <error.h>
+#include <fcntl.h>
+#include <libintl.h>
+#include <link.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/ptrace.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <scratch_buffer.h>
+
+#include <ldsodefs.h>
+#include <version.h>
+
+/* Global variables. */
+extern char *program_invocation_short_name;
+#define PACKAGE _libc_intl_domainname
+
+/* External functions. */
+#include <programs/xmalloc.h>
+
+/* Name and version of program. */
+static void print_version (FILE *stream, struct argp_state *state);
+void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;
+
+/* Function to print some extra text in the help message. */
+static char *more_help (int key, const char *text, void *input);
+
+/* Definitions of arguments for argp functions. */
+static const struct argp_option options[] =
+{
+ { NULL, 0, NULL, 0, NULL }
+};
+
+/* Short description of program. */
+static const char doc[] = N_("\
+List dynamic shared objects loaded into process.");
+
+/* Strings for arguments in help texts. */
+static const char args_doc[] = N_("PID");
+
+/* Prototype for option handler. */
+static error_t parse_opt (int key, char *arg, struct argp_state *state);
+
+/* Data structure to communicate with argp functions. */
+static struct argp argp =
+{
+ options, parse_opt, args_doc, doc, NULL, more_help, NULL
+};
+
+// File descriptor of /proc/*/mem file.
+static int memfd;
+
+/* Name of the executable */
+static char *exe;
+
+/* Local functions. */
+static int get_process_info (int dfd, long int pid);
+static void wait_for_ptrace_stop (long int pid);
+
+
+int
+main (int argc, char *argv[])
+{
+ /* Parse and process arguments. */
+ int remaining;
+ argp_parse (&argp, argc, argv, 0, &remaining, NULL);
+
+ if (remaining != argc - 1)
+ {
+ fprintf (stderr,
+ gettext ("Exactly one parameter with process ID required.\n"));
+ argp_help (&argp, stderr, ARGP_HELP_SEE, program_invocation_short_name);
+ return 1;
+ }
+
+ assert (sizeof (pid_t) == sizeof (int)
+ || sizeof (pid_t) == sizeof (long int));
+ char *endp;
+ errno = 0;
+ long int pid = strtol (argv[remaining], &endp, 10);
+ if (pid < 0 || (pid == ULONG_MAX && errno == ERANGE) || *endp != '\0'
+ || (sizeof (pid_t) < sizeof (pid) && pid > INT_MAX))
+ error (EXIT_FAILURE, 0, gettext ("invalid process ID '%s'"),
+ argv[remaining]);
+
+ /* Determine the program name. */
+ char buf[7 + 3 * sizeof (pid)];
+ snprintf (buf, sizeof (buf), "/proc/%lu", pid);
+ int dfd = open (buf, O_RDONLY | O_DIRECTORY);
+ if (dfd == -1)
+ error (EXIT_FAILURE, errno, gettext ("cannot open %s"), buf);
+
+ struct scratch_buffer exebuf;
+ scratch_buffer_init (&exebuf);
+ ssize_t nexe;
+ while ((nexe = readlinkat (dfd, "exe",
+ exebuf.data, exebuf.length)) == exebuf.length)
+ {
+ if (!scratch_buffer_grow (&exebuf))
+ {
+ nexe = -1;
+ break;
+ }
+ }
+ if (nexe == -1)
+ exe = (char *) "<program name undetermined>";
+ else
+ {
+ exe = exebuf.data;
+ exe[nexe] = '\0';
+ }
+
+ /* Stop all threads since otherwise the list of loaded modules might
+ change while we are reading it. */
+ struct thread_list
+ {
+ pid_t tid;
+ struct thread_list *next;
+ } *thread_list = NULL;
+
+ int taskfd = openat (dfd, "task", O_RDONLY | O_DIRECTORY | O_CLOEXEC);
+ if (taskfd == 1)
+ error (EXIT_FAILURE, errno, gettext ("cannot open %s/task"), buf);
+ DIR *dir = fdopendir (taskfd);
+ if (dir == NULL)
+ error (EXIT_FAILURE, errno, gettext ("cannot prepare reading %s/task"),
+ buf);
+
+ struct dirent64 *d;
+ while ((d = readdir64 (dir)) != NULL)
+ {
+ if (! isdigit (d->d_name[0]))
+ continue;
+
+ errno = 0;
+ long int tid = strtol (d->d_name, &endp, 10);
+ if (tid < 0 || (tid == ULONG_MAX && errno == ERANGE) || *endp != '\0'
+ || (sizeof (pid_t) < sizeof (pid) && tid > INT_MAX))
+ error (EXIT_FAILURE, 0, gettext ("invalid thread ID '%s'"),
+ d->d_name);
+
+ if (ptrace (PTRACE_ATTACH, tid, NULL, NULL) != 0)
+ {
+ /* There might be a race between reading the directory and
+ threads terminating. Ignore errors attaching to unknown
+ threads unless this is the main thread. */
+ if (errno == ESRCH && tid != pid)
+ continue;
+
+ error (EXIT_FAILURE, errno, gettext ("cannot attach to process %lu"),
+ tid);
+ }
+
+ wait_for_ptrace_stop (tid);
+
+ struct thread_list *newp = alloca (sizeof (*newp));
+ newp->tid = tid;
+ newp->next = thread_list;
+ thread_list = newp;
+ }
+
+ closedir (dir);
+
+ int status = get_process_info (dfd, pid);
+
+ assert (thread_list != NULL);
+ do
+ {
+ ptrace (PTRACE_DETACH, thread_list->tid, NULL, NULL);
+ thread_list = thread_list->next;
+ }
+ while (thread_list != NULL);
+
+ close (dfd);
+
+ return status;
+}
+
+
+/* Wait for PID to enter ptrace-stop state after being attached. */
+static void
+wait_for_ptrace_stop (long int pid)
+{
+ int status;
+
+ /* While waiting for SIGSTOP being delivered to the tracee we have to
+ reinject any other pending signal. Ignore all other errors. */
+ while (waitpid (pid, &status, __WALL) == pid && WIFSTOPPED (status))
+ {
+ /* The STOP signal should not be delivered to the tracee. */
+ if (WSTOPSIG (status) == SIGSTOP)
+ return;
+ if (ptrace (PTRACE_CONT, pid, NULL,
+ (void *) (uintptr_t) WSTOPSIG (status)))
+ /* The only possible error is that the process died. */
+ return;
+ }
+}
+
+
+/* Handle program arguments. */
+static error_t
+parse_opt (int key, char *arg, struct argp_state *state)
+{
+ switch (key)
+ {
+ default:
+ return ARGP_ERR_UNKNOWN;
+ }
+ return 0;
+}
+
+
+/* Print bug-reporting information in the help message. */
+static char *
+more_help (int key, const char *text, void *input)
+{
+ char *tp = NULL;
+ switch (key)
+ {
+ case ARGP_KEY_HELP_EXTRA:
+ /* We print some extra information. */
+ if (asprintf (&tp, gettext ("\
+For bug reporting instructions, please see:\n\
+%s.\n"), REPORT_BUGS_TO) < 0)
+ return NULL;
+ return tp;
+ default:
+ break;
+ }
+ return (char *) text;
+}
+
+/* Print the version information. */
+static void
+print_version (FILE *stream, struct argp_state *state)
+{
+ fprintf (stream, "pldd %s%s\n", PKGVERSION, VERSION);
+ fprintf (stream, gettext ("\
+Copyright (C) %s Free Software Foundation, Inc.\n\
+This is free software; see the source for copying conditions. There is NO\n\
+warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
+"), "2017");
+ fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper");
+}
+
+
+#define CLASS 32
+#include "pldd-xx.c"
+#define CLASS 64
+#include "pldd-xx.c"
+
+
+static int
+get_process_info (int dfd, long int pid)
+{
+ memfd = openat (dfd, "mem", O_RDONLY);
+ if (memfd == -1)
+ goto no_info;
+
+ int fd = openat (dfd, "exe", O_RDONLY);
+ if (fd == -1)
+ {
+ no_info:
+ error (0, errno, gettext ("cannot get information about process %lu"),
+ pid);
+ return EXIT_FAILURE;
+ }
+
+ char e_ident[EI_NIDENT];
+ if (read (fd, e_ident, EI_NIDENT) != EI_NIDENT)
+ goto no_info;
+
+ close (fd);
+
+ if (memcmp (e_ident, ELFMAG, SELFMAG) != 0)
+ {
+ error (0, 0, gettext ("process %lu is no ELF program"), pid);
+ return EXIT_FAILURE;
+ }
+
+ fd = openat (dfd, "auxv", O_RDONLY);
+ if (fd == -1)
+ goto no_info;
+
+ size_t auxv_size = 0;
+ void *auxv = NULL;
+ while (1)
+ {
+ auxv_size += 512;
+ auxv = xrealloc (auxv, auxv_size);
+
+ ssize_t n = pread (fd, auxv, auxv_size, 0);
+ if (n < 0)
+ goto no_info;
+ if (n < auxv_size)
+ {
+ auxv_size = n;
+ break;
+ }
+ }
+
+ close (fd);
+
+ int retval;
+ if (e_ident[EI_CLASS] == ELFCLASS32)
+ retval = find_maps32 (pid, auxv, auxv_size);
+ else
+ retval = find_maps64 (pid, auxv, auxv_size);
+
+ free (auxv);
+ close (memfd);
+
+ return retval;
+}
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