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proc.c
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proc.c
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/* proc.c -- Server process registry
*
* Copyright (c) 1994-2008 Carnegie Mellon University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <signal.h>
#include <syslog.h>
#include <string.h>
#include <sys/stat.h>
#include "assert.h"
#include "exitcodes.h"
#include "global.h"
#include "proc.h"
#include "retry.h"
#include "util.h"
#include "xmalloc.h"
#ifdef HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# if HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif
# if HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif
# if HAVE_NDIR_H
# include <ndir.h>
# endif
#endif
#define FNAME_PROCDIR "/proc"
static char *procfname = 0;
static char *proc_getpath(pid_t pid, int isnew)
{
struct buf buf = BUF_INITIALIZER;
if (config_getstring(IMAPOPT_PROC_PATH)) {
const char *procpath = config_getstring(IMAPOPT_PROC_PATH);
if (procpath[0] != '/')
fatal("proc path must be fully qualified", EC_CONFIG);
if (strlen(procpath) < 2)
fatal("proc path must not be '/'", EC_CONFIG);
buf_setcstr(&buf, procpath);
if (buf.s[buf.len-1] != '/')
buf_putc(&buf, '/');
}
else {
buf_setcstr(&buf, config_dir);
buf_appendcstr(&buf, FNAME_PROCDIR);
}
if (pid)
buf_printf(&buf, "%u", pid);
if (isnew)
buf_appendcstr(&buf, ".new");
return buf_release(&buf);
}
static char *proc_getdir(void)
{
return proc_getpath(0, 0);
}
EXPORTED int proc_register(const char *servicename, const char *clienthost,
const char *userid, const char *mailbox, const char *cmd)
{
pid_t pid = getpid();
FILE *procfile = NULL;
char *newfname = NULL;
if (!procfname)
procfname = proc_getpath(pid, /*isnew*/0);
newfname = proc_getpath(pid, /*isnew*/1);
procfile = fopen(newfname, "w+");
if (!procfile) {
if (cyrus_mkdir(newfname, 0755) == -1) {
fatal("couldn't create proc directory", EC_IOERR);
}
else {
syslog(LOG_NOTICE, "created proc directory");
procfile = fopen(newfname, "w+");
if (!procfile) {
syslog(LOG_ERR, "IOERROR: creating %s: %m", newfname);
fatal("can't write proc file", EC_IOERR);
}
}
}
if (!servicename) servicename = "";
if (!clienthost) clienthost = "";
if (!userid) userid = "";
if (!mailbox) mailbox = "";
if (!cmd) cmd = "";
fprintf(procfile, "%s\t%s\t%s\t%s\t%s\n", servicename, clienthost, userid, mailbox, cmd);
fclose(procfile);
if (rename(newfname, procfname)) {
syslog(LOG_ERR, "IOERROR: renaming %s to %s: %m", newfname, procfname);
unlink(newfname);
fatal("can't write proc file", EC_IOERR);
}
setproctitle("%s: %s %s %s %s", servicename, clienthost, userid, mailbox, cmd);
free(newfname);
return 0;
}
EXPORTED void proc_cleanup(void)
{
if (procfname) {
unlink(procfname);
free(procfname);
procfname = NULL;
}
}
static int proc_foreach_helper(pid_t pid, procdata_t *func, void *rock)
{
int r = 0;
char *buf = NULL;
char *path = NULL;
int fd = -1;
path = proc_getpath(pid, /*isnew*/0);
fd = open(path, O_RDONLY, 0);
if (fd != -1) {
/* yay, got a file */
int n;
struct stat sbuf;
char *p;
char *service = NULL;
char *host = NULL;
char *user = NULL;
char *mailbox = NULL;
char *cmd = NULL;
if (fstat(fd, &sbuf))
goto done;
if (!S_ISREG(sbuf.st_mode))
goto done;
/* grab a copy of the file contents */
buf = xmalloc(sbuf.st_size+1);
n = retry_read(fd, buf, sbuf.st_size);
if (n != sbuf.st_size)
goto done;
buf[sbuf.st_size] = '\0';
/* remove any endline characters */
p = strchr(buf, '\r');
if (p) *p = '\0';
p = strchr(buf, '\n');
if (p) *p = '\0';
/* parse the fields */
service = buf;
host = strchr(service, '\t');
if (!host) goto done;
*host++ = '\0';
user = strchr(host, '\t');
if (user) {
*user++ = '\0';
mailbox = strchr(user, '\t');
}
if (mailbox) {
*mailbox++ = '\0';
cmd = strchr(mailbox, '\t');
}
if (cmd) {
*cmd++ = '\0';
}
(*func)(pid, service, host, user, mailbox, cmd, rock);
}
done:
xclose(fd);
free(buf);
free(path);
return r;
}
EXPORTED int proc_foreach(procdata_t *func, void *rock)
{
DIR *dirp;
struct dirent *dirent;
char *path;
const char *p;
pid_t pid;
char *end = NULL;
int r = 0;
path = proc_getdir();
dirp = opendir(path);
if (dirp) {
while ((dirent = readdir(dirp)) != NULL) {
p = dirent->d_name;
if (*p == '.') continue; /* dot files */
pid = strtoul(p, &end, 10);
if (pid == 0 || end == NULL || *end || end == p) {
syslog(LOG_ERR, "IOERROR: bogus filename \"%s/%s\" in proc_foreach",
path, p);
continue;
}
r = proc_foreach_helper(pid, func, rock);
if (r) break;
}
closedir(dirp);
}
free(path);
return r;
}
static int procusage_cb(pid_t pid __attribute__((unused)),
const char *servicename __attribute__((unused)),
const char *clienthost,
const char *userid,
const char *mboxname __attribute__((unused)),
const char *cmd __attribute__((unused)),
void *rock)
{
struct proc_limits *limitsp = (struct proc_limits *)rock;
/* we only count logged in sessions */
if (!userid) return 0;
if (limitsp->clienthost && !strcmp(clienthost, limitsp->clienthost))
limitsp->host++;
if (limitsp->userid && !strcmp(userid, limitsp->userid))
limitsp->user++;
return 0;
}
EXPORTED int proc_checklimits(struct proc_limits *limitsp)
{
limitsp->maxhost = config_getint(IMAPOPT_MAXLOGINS_PER_HOST);
limitsp->maxuser = config_getint(IMAPOPT_MAXLOGINS_PER_USER);
if (!limitsp->maxuser && !limitsp->maxhost)
return 0;
limitsp->host = 0;
limitsp->user = 0;
proc_foreach(procusage_cb, limitsp);
if (limitsp->maxhost && limitsp->host >= limitsp->maxhost) return 1;
if (limitsp->maxuser && limitsp->user >= limitsp->maxuser) return 1;
return 0;
}
struct prockill_data {
const char *servicename;
const char *clienthost;
const char *userid;
const char *mboxname;
const char *cmd;
int sig;
};
#define PROCKILL_INIT { NULL, NULL, NULL, NULL, NULL, 0 }
static int prockill_cb(pid_t pid,
const char *servicename,
const char *clienthost,
const char *userid,
const char *mboxname,
const char *cmd,
void *rock)
{
struct prockill_data *dat = (struct prockill_data *)rock;
pid_t mypid = getpid();
/* don't kill myself */
if (mypid == pid)
return 0;
if (dat->servicename && strcmpsafe(servicename, dat->servicename))
return 0;
if (dat->clienthost && strcmpsafe(clienthost, dat->clienthost))
return 0;
if (dat->userid && strcmpsafe(userid, dat->userid))
return 0;
if (dat->mboxname && strcmpsafe(mboxname, dat->mboxname))
return 0;
if (dat->cmd && strcmpsafe(cmd, dat->cmd))
return 0;
if (dat->sig)
kill(pid, dat->sig);
else
kill(pid, SIGTERM);
return 0;
}
EXPORTED void proc_killuser(const char *userid)
{
struct prockill_data rock = PROCKILL_INIT;
/* can't kill all non-connected, that's evil */
assert(userid && userid[0]);
rock.userid = userid;
proc_foreach(prockill_cb, &rock);
}
EXPORTED void proc_killmbox(const char *mboxname)
{
struct prockill_data rock = PROCKILL_INIT;
/* can't kill all non-selected, that's evil */;
assert(mboxname && mboxname[0]);
rock.mboxname = mboxname;
proc_foreach(prockill_cb, &rock);
}
EXPORTED void proc_killusercmd(const char *userid, const char *cmd, int sig)
{
struct prockill_data rock = PROCKILL_INIT;
/* can't kill all non-selected, that's evil */;
assert(userid && userid[0]);
/* or all cmd either... use proc_killuser if you want that */
assert(cmd && cmd[0]);
rock.userid = userid;
rock.cmd = cmd;
rock.sig = sig;
proc_foreach(prockill_cb, &rock);
}

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