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From 01d38098b85628e90c9a326583ab0facf8b7c339 Mon Sep 17 00:00:00 2001
From: Jari Aalto <jari.aalto@cante.net>
Date: Wed, 27 Jan 2010 21:24:07 +0200
Subject: [PATCH] x11.c: CAN-2004-0157 and other changes
Signed-off-by: Jari Aalto <jari.aalto@cante.net>
---
x11.c | 106 +++++++++++++++++++++++++++++++++++++++++------------------------
1 files changed, 67 insertions(+), 39 deletions(-)
diff --git a/x11.c b/x11.c
index a1fdcfe..1d6589d 100644
--- a/x11.c
+++ b/x11.c
@@ -52,8 +52,7 @@
#ifdef __unix
#define MAXSCORES 10 /* number of entries in high score table */
-#define PATH_HIGHSCORE XONIXDIR "/scores"
-#define PATH_TEMPSCORE XONIXDIR "/score_tmp"
+#define PATH_HIGHSCORE "/var/cache/xonix/xonix.scores"
#if defined(__unix) && !defined PATH_RMAIL
#define PATH_RMAIL "rmail" /* rely on the $PATH */
@@ -61,6 +60,7 @@
#include <sys/types.h>
#include <sys/time.h>
+#include <sys/file.h>
#include <pwd.h>
#include <string.h>
#include <stdlib.h>
@@ -898,7 +898,6 @@ DisplayHighScore(void)
char *fullname = 0, *cp;
struct score_rec score_rec[MAXSCORES];
int i, numentries = 0;
- char tempname[sizeof(PATH_TEMPSCORE) + 15];
char hugestring[MAXSCORES * 100];
Widget box1, box2, msg, headl, done, area;
@@ -926,53 +925,62 @@ DisplayHighScore(void)
}
else
fullname = strdup(pw->pw_gecos);
- if((cp = strchr(fullname, ','))) *cp = 0; /* remove trailing garbage */
+ cp = strchr(fullname, ',');
+ if (cp == fullname) {
+ free(fullname);
+ fullname = strdup("(No name)");
+ }
+ else if (cp != NULL)
+ *cp = 0; /* remove trailing garbage */
}
else
fullname = strdup("(No name)"); /* the strdup() allows to free() it */
-
+
/* try opening high score file, and read it */
- if((high = fopen(PATH_HIGHSCORE, "r"))) {
- for(i = 0; i < 10; i++) {
+ if((high=fopen(PATH_HIGHSCORE, "r")) && (flock(fileno(high),LOCK_EX)==0)){
+ for(i = 0; i < MAXSCORES; i++) {
char line[100];
if(fgets(line, 100, high) == NULL)
break;
-
- if(sscanf(line, " %u %u%*[\t]%10[^\t]%*[\t]%64[^\t] %ld",
+
+ if(sscanf(line, "%u%*[\t]%u%*[\t]%10[^\t]%*[\t]%64[^\t]%*[\t]%ld",
&score_rec[i].score, &score_rec[i].level,
score_rec[i].login, score_rec[i].full,
&score_rec[i].tstamp)
- != 5) break; /* mangled entry */
+ <3 ) break; /* mangled entry */
}
numentries = i;
- fclose(high);
}
- if(numentries)
- qsort(score_rec, numentries, sizeof(struct score_rec), compare);
-
- /* make sure the new list will be world-readable */
- (void)umask(umask(0) & ~0644);
- sprintf(tempname, "%s.%d", PATH_TEMPSCORE, (int)getpid());
- if((high = fopen(tempname, "w")) == NULL) {
- fprintf(stderr, "xonix: cannot rewrite high score file\n");
+ else
+ {
+ if (high != NULL) {
+ fprintf(stderr, "xonix: cannot lock high score file\n");
+ fclose(high);
+ }
+ else
+ fprintf(stderr, "xonix: cannot open high score file\n");
free(fullname);
gameover_pending = 0;
return;
}
+
+ if(numentries)
+ qsort(score_rec, numentries, sizeof(struct score_rec), compare);
- if(numentries >= MAXSCORES && gHighScore < score_rec[0].score) {
+ if(numentries >= MAXSCORES && gHighScore <= score_rec[0].score) {
/* sorry, not among top ten */
- fclose(high);
- (void)unlink(tempname);
free(fullname);
+ if(flock(fileno(high),LOCK_UN) != 0)
+ fprintf(stderr, "xonix: cannot unlock high score file\n");
+ fclose(high);
gameover_pending = 0;
return;
}
for(i = 0; i < numentries; i++) {
/* look where to put entry */
- if(score_rec[i].score > gHighScore) break;
+ if(score_rec[i].score >= gHighScore) break;
}
#ifdef SEND_MAIL
@@ -993,19 +1001,32 @@ DisplayHighScore(void)
tm = localtime(&sp->tstamp);
strftime(tbuf, 20, "%d-%b-%y", tm);
- if((mail = popen(cmd, "w")) != NULL) {
- fprintf(mail,
- "To: %s (%s)\n"
- "Subject: Lost xonix championship\n\n"
- "Your previously held first rank in the local xonix score\n"
- "table (%u points, level %u, dated %s) has been\n"
- "vanished today by me with %u points.\n\n"
- "\t\tpitying you\t%s (%s)\n",
- sp->login, sp->full,
- sp->score, sp->level, tbuf,
- gHighScore,
- pw->pw_name, fullname);
- (void)pclose(mail);
+ /* format a text - fork and exec the processes so we can drop privileges */
+ switch( fork() ) {
+ case -1: /* Error */
+ perror(fork);
+ exit(1);
+ break;
+ case 0: /* Child */
+ setgid(pw->pw_gid);
+ setuid(pw->pw_uid);
+ if((mail = popen(cmd, "w")) != NULL) {
+ fprintf(mail,
+ "To: %s (%s)\n"
+ "Subject: Lost xonix championship\n\n"
+ "Your previously held first rank in the local xonix score\n"
+ "table (%u points, level %u, dated %s) has been\n"
+ "vanished today by me with %u points.\n\n"
+ "\t\tpitying you\t%s (%s)\n",
+ sp->login, sp->full,
+ sp->score, sp->level, tbuf,
+ gHighScore,
+ pw->pw_name, fullname);
+ (void)pclose(mail);
+ break;
+ default: /* parent */
+ break;
+ }
}
}
@@ -1036,16 +1057,23 @@ DisplayHighScore(void)
score_rec[i].tstamp = time(NULL);
free(fullname);
+ if((high = freopen(PATH_HIGHSCORE, "w",high)) == NULL) {
+ fprintf(stderr, "xonix: cannot reopen high score file\n");
+ free(fullname);
+ gameover_pending = 0;
+ return;
+ }
+
for(i = 0; i < numentries; i++)
(void)fprintf(high, "%u\t%u\t%s\t%s\t%ld\n",
score_rec[i].score, score_rec[i].level,
score_rec[i].login, score_rec[i].full,
score_rec[i].tstamp);
+
+ if(flock(fileno(high),LOCK_UN) != 0)
+ fprintf(stderr, "xonix: cannot unlock high score file\n");
fclose(high);
- if(rename(tempname, PATH_HIGHSCORE))
- fprintf(stderr, "xonix: cannot install new highscore file\n");
-
/* create hugestring for highscore label */
hugestring[0] = 0;
for(i = 0; i < numentries; i++) {
--
1.6.5
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