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/*
* Copyright (c) 1995-2003 Silicon Graphics, Inc. All Rights Reserved.
*
* 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 "pmapi.h"
#include "impl.h"
#include <sys/stat.h>
#include <sys/file.h>
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
/*
* Attempt to setup the notices file in a way that members of
* the (unprivileged) "pcp" group account can write to it.
*/
int gid;
#ifdef HAVE_GETGRNAM
static void
setup_group(void)
{
char *name = pmGetConfig("PCP_GROUP");
struct group *group;
if (!name || name[0] == '\0')
name = "pcp";
group = getgrnam(name);
if (group)
gid = group->gr_gid;
}
#else
#define setup_group()
#endif
static int
mkdir_r(char *path)
{
struct stat sbuf;
int sts;
if (stat(path, &sbuf) < 0) {
if (mkdir_r(dirname(strdup(path))) < 0)
return -1;
sts = mkdir2(path, 0775);
if (chown(path, 0, gid) < 0)
fprintf(stderr, "pmpost: cannot set dir gid[%d]: %s\n", gid, path);
return sts;
}
else if ((sbuf.st_mode & S_IFDIR) == 0) {
fprintf(stderr, "pmpost: \"%s\" is not a directory\n", path);
exit(1);
}
return 0;
}
#define LAST_UNDEFINED -1
#define LAST_NEWFILE -2
int
main(int argc, char **argv)
{
int i;
int fd;
FILE *np;
char *dir;
struct stat sbuf;
time_t now;
int lastday = LAST_UNDEFINED;
struct tm *tmp;
int sts = 0;
char notices[MAXPATHLEN];
#ifndef IS_MINGW
char *ep;
struct flock lock;
extern char **environ;
static char *newenviron[] =
{ "HOME=/nowhere", "SHELL=/noshell", "PATH=/nowhere", NULL };
static char *keepname[] =
{ "TZ", "PCP_DIR", "PCP_CONF", NULL };
char *keepval[] =
{ NULL, NULL, NULL, NULL };
/*
* Fix for bug #827972, do not trust the environment.
* See also below.
*/
for (i = 0; keepname[i] != NULL; i++)
keepval[i] = getenv(keepname[i]);
environ = newenviron;
for (i = 0; keepname[i] != NULL; i++) {
if (keepval[i] != NULL) {
snprintf(notices, sizeof(notices), "%s=%s", keepname[i], keepval[i]);
if ((ep = strdup(notices)) != NULL)
putenv(ep);
}
}
#endif
umask(0002);
if ((argc == 1) || (argc == 2 && strcmp(argv[1], "-?") == 0)) {
fprintf(stderr, "Usage: pmpost message\n");
exit(1);
}
snprintf(notices, sizeof(notices), "%s%c" "NOTICES",
pmGetConfig("PCP_LOG_DIR"), __pmPathSeparator());
setup_group();
dir = dirname(strdup(notices));
if (mkdir_r(dir) < 0) {
fprintf(stderr, "pmpost: cannot create directory \"%s\": %s\n",
dir, osstrerror());
exit(1);
}
if ((fd = open(notices, O_WRONLY|O_APPEND, 0)) < 0) {
if ((fd = open(notices, O_WRONLY|O_CREAT|O_APPEND, 0664)) < 0) {
fprintf(stderr, "pmpost: cannot create file \"%s\": %s\n",
notices, osstrerror());
exit(1);
} else if ((fchown(fd, 0, gid)) < 0) {
fprintf(stderr, "pmpost: cannot set file gid \"%s\": %s\n",
notices, osstrerror());
}
lastday = LAST_NEWFILE;
}
#ifndef IS_MINGW
/*
* drop root privileges for bug #827972
*/
if (setuid(getuid()) < 0)
exit(1);
lock.l_type = F_WRLCK;
lock.l_whence = 0;
lock.l_start = 0;
lock.l_len = 0;
/*
* willing to try for 3 seconds to get the lock ... note fcntl()
* does not block, unlike flock()
*/
for (i = 0; i < 3; i++) {
if ((sts = fcntl(fd, F_SETLK, &lock)) != -1)
break;
sleep(1);
}
if (sts == -1) {
fprintf(stderr, "pmpost: warning, cannot lock file \"%s\"", notices);
if (oserror() != EINTR)
fprintf(stderr, ": %s", osstrerror());
fputc('\n', stderr);
}
sts = 0;
#endif
/*
* have lock, get last modified day unless file just created
*/
if (lastday != LAST_NEWFILE) {
if (fstat(fd, &sbuf) < 0)
/* should never happen */
;
else {
tmp = localtime(&sbuf.st_mtime);
lastday = tmp->tm_yday;
}
}
if ((np = fdopen(fd, "a")) == NULL) {
fprintf(stderr, "pmpost: fdopen: %s\n", osstrerror());
exit(1);
}
time(&now);
tmp = localtime(&now);
if (lastday != tmp->tm_yday) {
if (fprintf(np, "\nDATE: %s", ctime(&now)) < 0)
sts = oserror();
}
if (fprintf(np, "%02d:%02d", tmp->tm_hour, tmp->tm_min) < 0)
sts = oserror();
for (i = 1; i < argc; i++) {
if (fprintf(np, " %s", argv[i]) < 0)
sts = oserror();
}
if (fputc('\n', np) < 0)
sts = oserror();
if (fclose(np) < 0)
sts = oserror();
if (sts < 0) {
fprintf(stderr, "pmpost: write failed: %s\n", osstrerror());
fprintf(stderr, "Lost message ...");
for (i = 1; i < argc; i++) {
fprintf(stderr, " %s", argv[i]);
}
fputc('\n', stderr);
}
exit(0);
}
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