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procps/ps/display.c
Qualys Security Advisory 7bd4f0b6d7 0062-ps/display.c: Always exit from signal_handler(). 
Right now, "we _exit() anyway" is not always true: for example, the
default action for SIGURG is to ignore the signal, which means that
"kill(getpid(), signo);" does not terminate the process. Call _exit()
explicitly, in this case (rather than exit(), because the terminating
kill() calls do not call the functions registered with atexit() either).
2018-06-09 21:45:38 +10:00

661 lines
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/*
* display.c - display ps output
* Copyright 1998-2003 by Albert Cahalan
*
* 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <grp.h>
#include <locale.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include "../include/c.h"
#include "../include/fileutils.h"
#include "../include/signals.h"
#include "../include/xalloc.h"
#include "common.h"
#ifndef SIGCHLD
#define SIGCHLD SIGCLD
#endif
char *myname;
long Hertz;
/* just reports a crash */
static void signal_handler(int signo){
if(signo==SIGPIPE) _exit(0); /* "ps | head" will cause this */
/* fprintf() is not reentrant, but we _exit() anyway */
fprintf(stderr,
_("Signal %d (%s) caught by %s (%s).\n"),
signo,
signal_number_to_name(signo),
myname,
PACKAGE_VERSION
);
switch (signo) {
case SIGHUP:
case SIGUSR1:
case SIGUSR2:
exit(EXIT_FAILURE);
default:
error_at_line(0, 0, __FILE__, __LINE__, "%s", _("please report this bug"));
signal(signo, SIG_DFL); /* allow core file creation */
kill(getpid(), signo);
_exit(EXIT_FAILURE);
}
}
/////////////////////////////////////////////////////////////////////////////////////
#undef DEBUG
#ifdef DEBUG
void init_stack_trace(char *prog_name);
#include <ctype.h>
void hex_dump(void *vp){
char *charlist;
int i = 0;
int line = 45;
char *cp = (char *)vp;
while(line--){
printf("%8lx ", (unsigned long)cp);
charlist = cp;
cp += 16;
for(i=0; i<16; i++){
if((charlist[i]>31) && (charlist[i]<127)){
printf("%c", charlist[i]);
}else{
printf(".");
}
}
printf(" ");
for(i=0; i<16; i++) printf(" %2x",(unsigned int)((unsigned char)(charlist[i])));
printf("\n");
i=0;
}
}
static void show_tgid(char *s, int n, sel_union *data){
printf("%s ", s);
while(--n){
printf("%d,", data[n].tgid);
}
printf("%d\n", data[0].tgid);
}
static void show_uid(char *s, int n, sel_union *data){
struct passwd *pw_data;
printf("%s ", s);
while(--n){
pw_data = getpwuid(data[n].uid);
if(pw_data) printf("%s,", pw_data->pw_name);
else printf("%d,", data[n].uid);
}
pw_data = getpwuid(data[n].uid);
if(pw_data) printf("%s\n", pw_data->pw_name);
else printf("%d\n", data[n].uid);
}
static void show_gid(char *s, int n, sel_union *data){
struct group *gr_data;
printf("%s ", s);
while(--n){
gr_data = getgrgid(data[n].gid);
if(gr_data) printf("%s,", gr_data->gr_name);
else printf("%d,", data[n].gid);
}
gr_data = getgrgid(data[n].gid);
if(gr_data) printf("%s\n", gr_data->gr_name);
else printf("%d\n", data[n].gid);
}
static void show_tty(char *s, int n, sel_union *data){
printf("%s ", s);
while(--n){
printf("%d:%d,", (int)major(data[n].tty), (int)minor(data[n].tty));
}
printf("%d:%d\n", (int)major(data[n].tty), (int)minor(data[n].tty));
}
static void show_cmd(char *s, int n, sel_union *data){
printf("%s ", s);
while(--n){
printf("%.8s,", data[n].cmd);
}
printf("%.8s\n", data[0].cmd);
}
static void arg_show(void){
selection_node *walk = selection_list;
while(walk){
switch(walk->typecode){
case SEL_RUID: show_uid("RUID", walk->n, walk->u); break;
case SEL_EUID: show_uid("EUID", walk->n, walk->u); break;
case SEL_SUID: show_uid("SUID", walk->n, walk->u); break;
case SEL_FUID: show_uid("FUID", walk->n, walk->u); break;
case SEL_RGID: show_gid("RGID", walk->n, walk->u); break;
case SEL_EGID: show_gid("EGID", walk->n, walk->u); break;
case SEL_SGID: show_gid("SGID", walk->n, walk->u); break;
case SEL_FGID: show_gid("FGID", walk->n, walk->u); break;
case SEL_PGRP: show_pid("PGRP", walk->n, walk->u); break;
case SEL_PID : show_pid("PID ", walk->n, walk->u); break;
case SEL_PID_QUICK : show_pid("PID_QUICK ", walk->n, walk->u); break;
case SEL_PPID: show_pid("PPID", walk->n, walk->u); break;
case SEL_TTY : show_tty("TTY ", walk->n, walk->u); break;
case SEL_SESS: show_pid("SESS", walk->n, walk->u); break;
case SEL_COMM: show_cmd("COMM", walk->n, walk->u); break;
default: printf("Garbage typecode value!\n");
}
walk = walk->next;
}
}
#endif
//////////////////////////////////////////////////////////////////////////
/***** check the header */
/* Unix98: must not print empty header */
static void check_headers(void){
format_node *walk = format_list;
int head_normal = 0;
if(header_type==HEAD_MULTI){
header_gap = screen_rows-1; /* true BSD */
return;
}
if(header_type==HEAD_NONE){
lines_to_next_header = -1; /* old Linux */
return;
}
while(walk){
if(!*(walk->name)){
walk = walk->next;
continue;
}
if(walk->pr){
head_normal++;
walk = walk->next;
continue;
}
walk = walk->next;
}
if(!head_normal) lines_to_next_header = -1; /* how UNIX does --noheader */
}
static format_node *proc_format_list;
static format_node *task_format_list;
/***** munge lists and determine final needs */
static void lists_and_needs(void){
check_headers();
// only care about the difference when showing both
if(thread_flags & TF_show_both){
format_node pfn, tfn; // junk, to handle special case at begin of list
format_node *walk = format_list;
format_node *p_end = &pfn;
format_node *t_end = &tfn;
while(walk){
format_node *new = xmalloc(sizeof(format_node));
memcpy(new,walk,sizeof(format_node));
p_end->next = walk;
t_end->next = new;
p_end = walk;
t_end = new;
switch(walk->flags & CF_PRINT_MASK){
case CF_PRINT_THREAD_ONLY:
p_end->pr = pr_nop;
break;
case CF_PRINT_PROCESS_ONLY:
t_end->pr = pr_nop;
break;
default:
catastrophic_failure(__FILE__, __LINE__, _("please report this bug"));
// FALL THROUGH
case CF_PRINT_AS_NEEDED:
case CF_PRINT_EVERY_TIME:
break;
}
walk = walk->next;
}
t_end->next = NULL;
p_end->next = NULL;
proc_format_list = pfn.next;
task_format_list = tfn.next;
}else{
proc_format_list = format_list;
task_format_list = format_list;
}
}
//////////////////////////////////////////////////////////////////////////
/***** fill in %CPU; not in libproc because of include_dead_children */
/* Note: for sorting, not display, so 0..0x7fffffff would be OK */
static void value_this_proc_pcpu(proc_t *buf){
unsigned long long used_jiffies;
unsigned long pcpu = 0;
unsigned long long seconds;
if(want_this_proc(buf)) {
if(include_dead_children) used_jiffies = rSv(TICS_ALL_C, ull_int, buf);
else used_jiffies = rSv(TICS_ALL, ull_int, buf);
seconds = rSv(TIME_ELAPSED, ull_int, buf);
if(seconds) pcpu = (used_jiffies * 1000ULL / Hertz) / seconds;
// if xtra-procps-debug.h active, can't use PIDS_VAL as base due to assignment
buf->head[rel_extra].result.ul_int = pcpu;
}
}
/***** just display */
static void simple_spew(void){
struct pids_fetch *pidread;
proc_t *buf;
int i;
// -q option (only single SEL_PID_QUICK typecode entry expected in the list, if present)
if (selection_list && selection_list->typecode == SEL_PID_QUICK) {
unsigned *pidlist = xcalloc(selection_list->n, sizeof(unsigned));
for (i = 0; i < selection_list->n; i++)
pidlist[i] = selection_list->u[selection_list->n-i-1].pid;
pidread = procps_pids_select(Pids_info, pidlist, selection_list->n, PIDS_SELECT_PID);
free(pidlist);
} else {
enum pids_fetch_type which;
which = (thread_flags & (TF_loose_tasks|TF_show_task))
? PIDS_FETCH_THREADS_TOO : PIDS_FETCH_TASKS_ONLY;
pidread = procps_pids_reap(Pids_info, which);
}
if (!pidread) {
fprintf(stderr, _("fatal library error, reap\n"));
exit(EXIT_FAILURE);
}
switch(thread_flags & (TF_show_proc|TF_loose_tasks|TF_show_task)){
case TF_show_proc: // normal non-thread output
for (i = 0; i < pidread->counts->total; i++) {
buf = pidread->stacks[i];
if (want_this_proc(buf))
show_one_proc(buf, proc_format_list);
}
break;
case TF_show_task: // -L and -T options
case TF_show_proc|TF_loose_tasks: // H option
for (i = 0; i < pidread->counts->total; i++) {
buf = pidread->stacks[i];
if (want_this_proc(buf))
show_one_proc(buf, task_format_list);
}
break;
case TF_show_proc|TF_show_task: // m and -m options
procps_pids_sort(Pids_info, pidread->stacks
, pidread->counts->total, PIDS_TIME_START, PIDS_SORT_ASCEND);
procps_pids_sort(Pids_info, pidread->stacks
, pidread->counts->total, PIDS_ID_TGID, PIDS_SORT_ASCEND);
for (i = 0; i < pidread->counts->total; i++) {
buf = pidread->stacks[i];
next_proc:
if (want_this_proc(buf)) {
int self = rSv(ID_PID, s_int, buf);
show_one_proc(buf, proc_format_list);
for (; i < pidread->counts->total; i++) {
buf = pidread->stacks[i];
if (rSv(ID_TGID, s_int, buf) != self) goto next_proc;
show_one_proc(buf, task_format_list);
}
}
}
break;
}
}
/***** forest output requires sorting by ppid; add start_time by default */
static void prep_forest_sort(void){
sort_node *tmp_list = sort_list;
const format_struct *incoming;
if(!sort_list) { /* assume start time order */
incoming = search_format_array("ppid");
if(!incoming) { fprintf(stderr, _("could not find ppid\n")); exit(1); }
tmp_list = xmalloc(sizeof(sort_node));
tmp_list->reverse = PIDS_SORT_ASCEND;
tmp_list->typecode = '?'; /* what was this for? */
tmp_list->sr = incoming->sr;
tmp_list->next = sort_list;
sort_list = tmp_list;
}
/* this is required for the forest option */
incoming = search_format_array("start_time");
if(!incoming) { fprintf(stderr, _("could not find start_time\n")); exit(1); }
tmp_list = xmalloc(sizeof(sort_node));
tmp_list->reverse = PIDS_SORT_ASCEND;
tmp_list->typecode = '?'; /* what was this for? */
tmp_list->sr = incoming->sr;
tmp_list->next = sort_list;
sort_list = tmp_list;
}
/* we rely on the POSIX requirement for zeroed memory */
static proc_t **processes;
/***** show pre-sorted array of process pointers */
static void show_proc_array(int n){
proc_t **p = processes;
while(n--){
show_one_proc(*p, proc_format_list);
p++;
}
}
/***** show tree */
/* this needs some optimization work */
#define ADOPTED(x) 1
#define IS_LEVEL_SAFE(level) \
((level) >= 0 && (size_t)(level) < sizeof(forest_prefix))
static void show_tree(const int self, const int n, const int level, const int have_sibling){
int i = 0;
if(!IS_LEVEL_SAFE(level))
catastrophic_failure(__FILE__, __LINE__, _("please report this bug"));
if(level){
/* add prefix of "+" or "L" */
if(have_sibling) forest_prefix[level-1] = '+';
else forest_prefix[level-1] = 'L';
}
forest_prefix[level] = '\0';
show_one_proc(processes[self],format_list); /* first show self */
for(;;){ /* look for children */
if(i >= n) return; /* no children */
if(rSv(ID_PPID, s_int, processes[i]) == rSv(ID_PID, s_int, processes[self])) break;
i++;
}
if(level){
/* change our prefix to "|" or " " for the children */
if(have_sibling) forest_prefix[level-1] = '|';
else forest_prefix[level-1] = ' ';
}
forest_prefix[level] = '\0';
for(;;){
int self_pid;
int more_children = 1;
if(i >= n) break; /* over the edge */
self_pid=rSv(ID_PID, s_int, processes[self]);
if(i+1 >= n)
more_children = 0;
else
if(rSv(ID_PPID, s_int, processes[i+1]) != self_pid) more_children = 0;
if(self_pid==1 && ADOPTED(processes[i]) && forest_type!='u')
show_tree(i++, n, level, more_children);
else
show_tree(i++, n, IS_LEVEL_SAFE(level+1) ? level+1 : level, more_children);
if(!more_children) break;
}
/* chop prefix that children added -- do we need this? */
/* chop prefix that children added */
forest_prefix[level] = '\0';
}
#undef IS_LEVEL_SAFE
/***** show forest */
static void show_forest(const int n){
int i = n;
int j;
while(i--){ /* cover whole array looking for trees */
j = n;
while(j--){ /* search for parent: if none, i is a tree! */
if(rSv(ID_PID, s_int, processes[j]) == rSv(ID_PPID, s_int, processes[i])) goto not_root;
}
show_tree(i,n,0,0);
not_root:
;
}
/* don't free the array because it takes time and ps will exit anyway */
}
#if 0
static int want_this_proc_nop(proc_t *dummy){
(void)dummy;
return 1;
}
#endif
/***** sorted or forest */
static void fancy_spew(void){
struct pids_fetch *pidread;
enum pids_fetch_type which;
proc_t *buf;
int i, n = 0;
which = (thread_flags & TF_loose_tasks)
? PIDS_FETCH_THREADS_TOO : PIDS_FETCH_TASKS_ONLY;
pidread = procps_pids_reap(Pids_info, which);
if (!pidread || !pidread->counts->total) {
fprintf(stderr, _("fatal library error, reap\n"));
exit(EXIT_FAILURE);
}
processes = xcalloc(pidread->counts->total, sizeof(void*));
for (i = 0; i < pidread->counts->total; i++) {
buf = pidread->stacks[i];
value_this_proc_pcpu(buf);
if (want_this_proc(buf))
processes[n++] = buf;
}
if (n) {
if(forest_type) prep_forest_sort();
while(sort_list) {
procps_pids_sort(Pids_info, processes, n, sort_list->sr, sort_list->reverse);
sort_list = sort_list->next;
}
if(forest_type) show_forest(n);
else show_proc_array(n);
}
free(processes);
}
static void arg_check_conflicts(void)
{
int selection_list_len;
int has_quick_pid;
selection_node *walk = selection_list;
has_quick_pid = 0;
selection_list_len = 0;
while (walk) {
if (walk->typecode == SEL_PID_QUICK) has_quick_pid++;
walk = walk->next;
selection_list_len++;
}
/* -q doesn't allow multiple occurrences */
if (has_quick_pid > 1) {
fprintf(stderr, "q/-q/--quick-pid can only be used once.\n");
exit(1);
}
/* -q doesn't allow combinations with other selection switches */
if (has_quick_pid && selection_list_len > has_quick_pid) {
fprintf(stderr, "q/-q/--quick-pid cannot be combined with other selection options.\n");
exit(1);
}
/* -q cannot be used with forest type listings */
if (has_quick_pid && forest_type) {
fprintf(stderr, "q/-q/--quick-pid cannot be used together with forest type listings.\n");
exit(1);
}
/* -q cannot be used with sort */
if (has_quick_pid && sort_list) {
fprintf(stderr, "q/-q,--quick-pid cannot be used together with sort options.\n");
exit(1);
}
/* -q cannot be used with -N */
if (has_quick_pid && negate_selection) {
fprintf(stderr, "q/-q/--quick-pid cannot be used together with negation switches.\n");
exit(1);
}
}
static void finalize_stacks (void)
{
format_node *f_node;
sort_node *s_node;
#if (PIDSITEMS < 60)
# error PIDSITEMS (common.h) should be at least 60!
#endif
/* first, ensure minimum result structures for items
which may or may not actually be displayable ... */
Pids_index = 0;
// needed by for selections
chkREL(CMD)
chkREL(ID_EGID)
chkREL(ID_EUID)
chkREL(ID_FGID)
chkREL(ID_FUID)
chkREL(ID_PID)
chkREL(ID_PPID)
chkREL(ID_RGID)
chkREL(ID_RUID)
chkREL(ID_SESSION)
chkREL(ID_SGID)
chkREL(ID_SUID)
chkREL(ID_TGID)
chkREL(STATE)
chkREL(TTY)
// needed to creata an enhanced 'stat/state'
chkREL(ID_PGRP)
chkREL(ID_TPGID)
chkREL(NICE)
chkREL(NLWP)
chkREL(RSS)
chkREL(VM_RSS_LOCKED)
// needed with 's' switch, previously assured
chkREL(SIGBLOCKED)
chkREL(SIGCATCH)
chkREL(SIGIGNORE)
chkREL(SIGNALS)
chkREL(SIGPENDING)
// needed with loss of defunct 'cook_time' macros
chkREL(TICS_ALL)
chkREL(TICS_ALL_C)
chkREL(TIME_ALL)
chkREL(TIME_ELAPSED)
chkREL(TIME_START)
// special items with 'extra' used as former pcpu
chkREL(extra)
chkREL(noop)
// now accommodate any results not yet satisfied
f_node = format_list;
while (f_node) {
(*f_node->pr)(NULL, NULL);
f_node = f_node->next;
}
s_node = sort_list;
while (s_node) {
if (s_node->xe) (*s_node->xe)(NULL, NULL);
s_node = s_node->next;
}
procps_pids_reset(Pids_info, Pids_items, Pids_index);
}
/***** no comment */
int main(int argc, char *argv[]){
atexit(close_stdout);
myname = strrchr(*argv, '/');
if (myname) ++myname; else myname = *argv;
Hertz = procps_hertz_get();
setlocale (LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
#ifdef DEBUG
init_stack_trace(argv[0]);
#else
do {
struct sigaction sa;
int i = 32;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = signal_handler;
sigfillset(&sa.sa_mask);
while(i--) switch(i){
default:
sigaction(i,&sa,NULL);
case 0:
case SIGCONT:
case SIGINT: /* ^C */
case SIGTSTP: /* ^Z */
case SIGTTOU: /* see stty(1) man page */
case SIGQUIT: /* ^\ */
case SIGPROF: /* profiling */
case SIGKILL: /* can not catch */
case SIGSTOP: /* can not catch */
case SIGWINCH: /* don't care if window size changes */
;
}
} while (0);
#endif
reset_global(); /* must be before parser */
arg_parse(argc,argv);
/* check for invalid combination of arguments */
arg_check_conflicts();
/* arg_show(); */
trace("screen is %ux%u\n",screen_cols,screen_rows);
/* printf("sizeof(proc_t) is %d.\n", sizeof(proc_t)); */
trace("======= ps output follows =======\n");
init_output(); /* must be between parser and output */
lists_and_needs();
finalize_stacks();
if(forest_type || sort_list) fancy_spew(); /* sort or forest */
else simple_spew(); /* no sort, no forest */
show_one_proc((proc_t *)-1,format_list); /* no output yet? */
procps_pids_unref(&Pids_info);
return 0;
}
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