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dsbmd.c
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dsbmd.c
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/*-
* Copyright (c) 2016 Marcel Kaiser. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <assert.h>
#include <sys/types.h>
#include <camlib.h>
#include <cam/cam_ccb.h>
#include <cam/scsi/scsi_message.h>
#include <cam/scsi/scsi_pass.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <fstab.h>
#include <grp.h>
#include <isofs/cd9660/iso.h>
#include <libgeom.h>
#include <libusb20_desc.h>
#include <libusb20.h>
#include <libutil.h>
#include <limits.h>
#include <locale.h>
#include <login_cap.h>
#include <paths.h>
#include <pthread.h>
#include <pwd.h>
#include <setjmp.h>
#include <regex.h>
#include <signal.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/cdio.h>
#include <sys/cdrio.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/iconv.h>
#include <sys/linker.h>
#include <sys/mdioctl.h>
#include <sys/module.h>
#include <sys/mount.h>
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <sys/user.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <vm/vm_param.h>
#include "common.h"
#include "fs.h"
#include "dsbmd.h"
#include "dsbcfg/dsbcfg.h"
#include "config.h"
#define MNTPTMODE (S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH)
#define MNTDIRPERM (S_IRWXU | S_IXGRP | S_IRGRP | S_IXOTH | S_IROTH)
#define NCOMMANDS (sizeof(commands) / sizeof(struct command_s))
#define USB_SUBCLASS_PTP 0x01
#define USB_SUBCLASS_MMC 0x02
#define USB_SUBCLASS_SFF 0x05
#define USB_SUBCLASS_UMASS 0x06
#define USB_CLASS_PTP 0x06
#define USB_CLASS_UMASS 0x08
#define USB_PROTOCOL_PTP 0x01
#define SCSI_SENSE_NOT_PRESENT "02 3a"
#define SCSI_SENSE_BECOMING_READY "02 04 01"
#define SCSI_SENSE_MEDIA_CHANGE "06 28 00"
#define die(msg, ...) do { \
logprint(msg, ##__VA_ARGS__); exit(EXIT_FAILURE); \
} while (0)
#define INITFS(i, ID) do { \
fstype[i].mntcmd = dsbcfg_getval(cfg, CFG_##ID##_MNTCMD).string; \
fstype[i].mntcmd_u = dsbcfg_getval(cfg, CFG_##ID##_MNTCMD_U).string; \
fstype[i].uopts = dsbcfg_getval(cfg, CFG_##ID##_OPTS).string; \
} while (0)
static int change_owner(sdev_t *, uid_t);
static int ssystem(uid_t, const char *);
static int devstat(const char *, struct stat *);
static int get_ugen_type(const char *);
static int get_optical_disk_type(const char *);
static int get_da_storage_type(const char *);
static int mymount(const char *, const char *, const char *,
const char *, uid_t, gid_t);
static int mount_device(client_t *, sdev_t *);
static int unmount_device(client_t *, sdev_t *, bool, bool);
static int exec_mntcmd(client_t *, sdev_t *, char *);
static int eject_media(client_t *, sdev_t *, bool);
static int set_cdrspeed(client_t *, sdev_t *, int);
static int set_msdosfs_locale(const char *, struct iovec**, size_t *);
static int uconnect(const char *);
static int devd_connect(void);
static int attach_mddev(client_t *, const char *);
static int detach_mddev(sdev_t *);
static int send_string(int, const char *);
static int client_readln(client_t *, int *);
static int serve_client(client_t *);
static int strtoargv(char *, char **, size_t, size_t *);
static bool match_part_dev(const char *, size_t);
static bool match_glabel(sdev_t *, const char *);
static bool has_media(const char *);
static bool scsi_has_media(const char *);
static bool is_parted(const char *);
static bool is_mountable(const char *);
static bool is_mntpt(const char *);
static bool check_permission(uid_t, gid_t *);
static bool usermount_set(void);
static char *read_devd_event(int, int *);
static char **extend_list(char **, int *, const char *);
static char *mkmntpt(const sdev_t *);
static char *getmntpt(sdev_t *);
static char *get_cam_modelname(const char *);
static char *get_diskname(const char *);
static char *get_lvm_dev(const char *);
static char *dev_from_gptid(const char *);
static char *ugen_to_gphoto_port(const char *);
static void *poll_thr(void *);
static void *devd_thr(void *);
static void *cmd_thr(void *);
static void lockpidfile(void);
static void usage(void);
static void setuserenv(uid_t);
static void switcheids(uid_t, gid_t);
static void restoreids(void);
static void rmntpt(const char *);
static void cleanup(int);
static void del_device(sdev_t *);
static void del_client(client_t *);
static void update_device(sdev_t *);
static void parse_devd_event(char *);
static void free_iovec(struct iovec *);
static void add_to_pollqueue(sdev_t *);
static void del_from_pollqueue(sdev_t *);
static void exec_cmd(client_t *, char *);
static void cmd_eject(client_t *, char **);
static void cmd_speed(client_t *, char **);
static void cmd_size(client_t *, char **);
static void cmd_mount(client_t *, char **);
static void cmd_unmount(client_t *, char **);
static void cmd_mdattach(client_t *, char **);
static void cmd_quit(client_t *cli, char **);
static void notifybc(sdev_t *, bool);
static void notify(client_t *, sdev_t *, bool);
static void cliprint(client_t *, const char *, ...);
static void cliprintbc(client_t *, const char *, ...);
static void check_mntbl(struct statfs *, int);
static void check_fuse_mount(struct statfs *, int);
static void check_fuse_unmount(struct statfs *, int);
static void add_errbuf(struct iovec **, size_t *, char **, size_t);
static void extend_iovec(struct iovec **, size_t *, const char *,
const char *);
static time_t poll_mntbl(void);
static sdev_t *add_device(const char *);
static sdev_t *add_ptp_device(const char *);
static sdev_t *add_mtp_device(const char *);
static sdev_t *media_changed(void);
static sdev_t *lookup_dev(const char *);
static client_t *add_client(int);
static client_t *process_connreq(int);
static const storage_type_t *get_storage_type(const char *);
/*
* Struct to represent the fields of a devd notify event.
*/
struct devdevent_s {
char *system; /* Bus or DEVFS */
char *subsystem; /* Only CDEV is interesting to us. */
char *type; /* Event type: CREATE, DESTROY. */
char *cdev; /* Device name. */
char *device; /* Device name (system == CAM) */
char *scsi_sense; /* SCSI sense data */
} devdevent;
static const char *glblprfx[NGLBLPRFX] = GLBLPRFX;
const storage_type_t storage_types[] = {
{ "HDD", ST_HDD },
{ "MMC", ST_MMC },
{ "VCD", ST_VCD },
{ "SVCD", ST_SVCD },
{ "DVD", ST_DVD },
{ "AUDIOCD", ST_CDDA },
{ "DATACD", ST_DATACD },
{ "USBDISK", ST_USBDISK },
{ "MTP", ST_MTP },
{ "PTP", ST_PTP },
{ "HDD", ST_FUSE },
{ "BLURAY", ST_BLURAY }
};
const iface_t interfaces[] = {
{ RE_CD, IF_TYPE_CD },
{ RE_ADA, IF_TYPE_ADA },
{ RE_DA, IF_TYPE_DA },
{ RE_UGEN, IF_TYPE_UGEN },
{ RE_LVM, IF_TYPE_LVM },
{ RE_MMC, IF_TYPE_MMC },
{ RE_MD, IF_TYPE_MD },
{ RE_FUSE, IF_TYPE_FUSE },
{ RE_NVD, IF_TYPE_NVD }
};
/*
* Struct to assign command strings/names to a function.
*/
struct command_s {
const char *cmd;
void (*cmdf)(client_t *, char **);
} commands[] = {
{ "quit", &cmd_quit },
{ "mount", &cmd_mount },
{ "unmount", &cmd_unmount },
{ "eject", &cmd_eject },
{ "speed", &cmd_speed },
{ "size", &cmd_size },
{ "mdattach", &cmd_mdattach}
};
typedef struct cmdthread_s {
char **argv;
bool timedout;
jmp_buf jmpenv;
client_t *cli;
pthread_t tid;
pthread_cond_t cond;
pthread_mutex_t mtx;
struct command_s *cmd;
} cmdthread_t;
struct thrlist_s {
cmdthread_t *cmdthr;
SLIST_ENTRY(thrlist_s) next;
};
/*
* Struct to represent a message sent from the threads
* to the main thread.
*/
struct ipcmsg_s {
char dev[MNAMELEN];
sdev_t *devp;
uint8_t type;
};
enum {
MSGTYPE_ADD_DEVICE = 1, MSGTYPE_UPDATE_DEVICE, MSGTYPE_DEL_DEVICE,
MSGTYPE_CHECK_FOR_MEDIA, MSGTYPE_MEDIA_REMOVED
};
static int ipcsv[2]; /* IPC socket pair for threads. */
static uid_t *allow_uids = NULL; /* UIDs allowed to connect. */
static gid_t *allow_gids = NULL; /* GIDs allowed to connect. */
static dsbcfg_t *cfg = NULL;
static struct pidfh *pfh = NULL; /* PID file handle. */
static pthread_mutex_t pollqmtx;
static pthread_mutex_t ipcsockmtx;
static SLIST_HEAD(, devlist_s) devs; /* List of mountable devs. */
static SLIST_HEAD(, clilist_s) clis; /* List of connected clients. */
static SLIST_HEAD(, devlist_s) pollq; /* Poll queue */
static SLIST_HEAD(, thrlist_s) cmdthreads;
int
main(int argc, char *argv[])
{
int i, sflags, maxfd, ch, lsock;
int csock, mntchkiv;
DIR *dirp, *dirp2;
bool fflag;
FILE *fp;
char lvmpath[512], **v;
time_t mntchktime;
sdev_t *devp;
fd_set allset, rset;
sigset_t sset;
client_t *cli;
pthread_t tid;
struct stat sb;
struct group *gr;
struct passwd *pw;
struct dirent *dp, *dp2;
struct timeval tv;
struct ipcmsg_s msg;
struct sockaddr_un s_addr;
struct clilist_s *ep, *ep_tmp;
fflag = false;
while ((ch = getopt(argc, argv, "fh")) != -1) {
switch (ch) {
case 'f':
fflag = true;
break;
case 'h':
case '?':
usage();
}
}
assert(CFG_NVARS == nvardefs);
cfg = dsbcfg_read(NULL, PATH_CONFIG, vardefs, CFG_NVARS);
if (cfg == NULL)
errx(EXIT_FAILURE, "%s", dsbcfg_strerror());
check_cfg_version(cfg);
check_cfg_opts(cfg);
/*
* Generate UID list of allowed users.
*/
for (i = 0, v = dsbcfg_getval(cfg, CFG_ALLOW_USERS).strings;
v != NULL && *v != NULL; v++, i++)
;
if ((allow_uids = malloc(sizeof(uid_t) * (i + 1))) == NULL)
err(EXIT_FAILURE, "malloc()");
for (i = 0, v = dsbcfg_getval(cfg, CFG_ALLOW_USERS).strings;
v != NULL && *v != NULL; v++, i++) {
if ((pw = getpwnam(*v)) == NULL)
errx(EXIT_FAILURE, "Unknown user '%s'", *v);
allow_uids[i] = pw->pw_uid;
}
endpwent();
allow_uids[i] = (uid_t)-1;
/*
* Generate GID list of allowed groups.
*/
for (i = 0, v = dsbcfg_getval(cfg, CFG_ALLOW_GROUPS).strings;
v != NULL && *v != NULL; v++, i++)
;
if ((allow_gids = malloc(sizeof(gid_t) * (i + 1))) == NULL)
err(EXIT_FAILURE, "malloc()");
for (i = 0, v = dsbcfg_getval(cfg, CFG_ALLOW_GROUPS).strings;
v != NULL && *v != NULL; v++, i++) {
if ((gr = getgrnam(*v)) == NULL)
errx(EXIT_FAILURE, "Unknown group '%s'", *v);
allow_gids[i] = gr->gr_gid;
}
endgrent();
allow_gids[i] = (gid_t)-1;
/*
* Preload the given filesystem kmods.
*/
for (v = dsbcfg_getval(cfg, CFG_PRELOAD_KMODS).strings;
v != NULL && *v != NULL; v++) {
if (modfind(*v) == -1 && errno == ENOENT) {
if (kldload(*v) == -1 && errno != EEXIST)
logprint("kldload(%s)", *v);
}
}
/* Timeout for select() */
mntchkiv = dsbcfg_getval(cfg, CFG_MNTCHK_INTERVAL).integer;
if (mntchkiv <= 0) {
logprintx("%s <= 0. Assuming %s = 1",
dsbcfg_varname(cfg, CFG_MNTCHK_INTERVAL),
dsbcfg_varname(cfg, CFG_MNTCHK_INTERVAL));
mntchkiv = 1;
}
for (i = 0; i < nfstypes; i++) {
switch (fstype[i].id) {
case UFS:
INITFS(i, UFS);
break;
case HFSP:
INITFS(i, HFSP);
break;
case CD9660:
INITFS(i, CD9660);
break;
case MSDOSFS:
INITFS(i, MSDOSFS);
break;
case NTFS:
INITFS(i, NTFS);
break;
case EXT4:
INITFS(i, EXT4);
break;
case EXT:
INITFS(i, EXT);
break;
case EXFAT:
INITFS(i, EXFAT);
break;
case MTPFS:
INITFS(i, MTPFS);
break;
case PTPFS:
INITFS(i, PTPFS);
break;
case XFS:
INITFS(i, XFS);
break;
case BTRFS:
INITFS(i, BTRFS);
break;
default:
/* Just to soothe clang. */
break;
}
}
SLIST_INIT(&devs);
SLIST_INIT(&clis);
SLIST_INIT(&pollq);
/* Ready to deamonize. */
if (!fflag) {
if (daemon(0, 0) == -1)
err(EXIT_FAILURE, "Failed to daemonize");
lockpidfile();
/* Redirect error messages, stdout and stderr to logfile. */
if ((fp = fopen(PATH_DSBMD_LOG, "a+")) == NULL)
err(EXIT_FAILURE, "fopen()");
(void)setvbuf(fp, NULL, _IOLBF, 0);
(void)dup2(fileno(fp), STDERR_FILENO);
(void)dup2(fileno(fp), STDOUT_FILENO);
err_set_file(fp);
} else
lockpidfile();
sigfillset(&sset);
sigdelset(&sset, SIGINT);
sigdelset(&sset, SIGTERM);
sigdelset(&sset, SIGQUIT);
sigdelset(&sset, SIGHUP);
if (sigprocmask(SIG_SETMASK, &sset, NULL) == -1)
die("sigprocmask()");
(void)signal(SIGINT, cleanup);
(void)signal(SIGTERM, cleanup);
(void)signal(SIGQUIT, cleanup);
(void)signal(SIGHUP, cleanup);
logprintx("%s started", PROGRAM);
/* Open the listening socket for the clients. */
(void)unlink(PATH_DSBMD_SOCKET);
if ((lsock = socket(AF_LOCAL, SOCK_STREAM, 0)) == -1)
die("socket()");
(void)memset((char *)&s_addr, 0, sizeof(s_addr));
(void)memcpy(s_addr.sun_path, PATH_DSBMD_SOCKET,
strlen(PATH_DSBMD_SOCKET));
s_addr.sun_family = AF_LOCAL;
if (bind(lsock, (struct sockaddr *)&s_addr, sizeof(s_addr)) == -1)
die("bind()");
if (chmod(PATH_DSBMD_SOCKET, SOCKET_MODE) == -1)
die("chmod(%s)", PATH_DSBMD_SOCKET);
if (listen(lsock, dsbcfg_getval(cfg, CFG_MAX_CLIENTS).integer) == -1)
die("listen()");
/*
* Make the listening socket non blocking in order to protect the
* server from certain DoS attacks.
*/
if ((sflags = fcntl(lsock, F_GETFL)) == -1)
die("fcntl()");
sflags |= O_NONBLOCK;
if (fcntl(lsock, F_SETFL, sflags) == -1)
die("fcntl()");
/* Get all currently installed disks. */
if (chdir(_PATH_DEV) == -1)
die("chdir(%s)", _PATH_DEV);
if ((dirp = opendir(".")) == NULL)
die("opendir(%s)", _PATH_DEV);
while ((dp = readdir(dirp)) != NULL) {
if (strcmp(dp->d_name, ".") == 0 ||
strcmp(dp->d_name, "..") == 0)
continue;
if (lstat(dp->d_name, &sb) == -1) {
logprint("stat(%s)", dp->d_name);
continue;
}
if (strncmp(dp->d_name, "ugen", 4) == 0)
add_device(dp->d_name);
else if (S_ISLNK(sb.st_mode)) {
/* Skip symlinks */
continue;
} else if (S_ISDIR(sb.st_mode) &&
strcmp(dp->d_name, "linux_lvm") == 0) {
/* Get Linux Logical Volumes */
dirp2 = opendir(dp->d_name);
if (dirp2 == NULL)
continue;
while ((dp2 = readdir(dirp2)) != NULL) {
if (strcmp(dp2->d_name, ".") == 0 ||
strcmp(dp2->d_name, "..") == 0)
continue;
(void)snprintf(lvmpath, sizeof(lvmpath),
"%s/%s", dp->d_name, dp2->d_name);
add_device(lvmpath);
}
(void)closedir(dirp2);
} else if (!S_ISDIR(sb.st_mode))
add_device(dp->d_name);
}
(void)closedir(dirp);
if (chdir("/") == -1)
die("chdir(/)");
if (socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, ipcsv) == -1)
die("socketpair()");
maxfd = lsock > ipcsv[0] ? lsock : ipcsv[0];
FD_ZERO(&allset);
FD_SET(lsock, &allset); FD_SET(ipcsv[0], &allset);
(void)pthread_mutex_init(&ipcsockmtx, NULL);
(void)pthread_mutex_init(&pollqmtx, NULL);
if (pthread_create(&tid, NULL, devd_thr, &ipcsv[1]) != 0)
die("pthread_create()");
/* Main loop. */
for (mntchktime = 0;;) {
rset = allset;
tv.tv_sec = mntchkiv; tv.tv_usec = 0;
if (time(NULL) - mntchktime >= mntchkiv)
mntchktime = poll_mntbl();
switch (select(maxfd + 1, &rset, NULL, NULL, &tv)) {
case -1:
if (errno == EINTR)
continue;
die("select()");
/* NOTREACHED */
case 0:
mntchktime = poll_mntbl();
continue;
}
if (FD_ISSET(lsock, &rset)) {
/* A client has connected. */
if ((cli = process_connreq(lsock)) != NULL) {
maxfd = maxfd > cli->s ? maxfd : cli->s;
FD_SET(cli->s, &allset);
}
}
if (FD_ISSET(ipcsv[0], &rset)) {
/* Polled device changed. */
if (recv(ipcsv[0], &msg, sizeof(msg),
MSG_WAITALL) == -1) {
if (errno == EINTR)
continue;
die("recv()");
}
switch (msg.type) {
case MSGTYPE_ADD_DEVICE:
add_device(msg.dev);
break;
case MSGTYPE_DEL_DEVICE:
if ((devp = lookup_dev(msg.dev)) == NULL)
break;
del_device(devp);
break;
case MSGTYPE_UPDATE_DEVICE:
update_device(msg.devp);
break;
case MSGTYPE_CHECK_FOR_MEDIA:
add_to_pollqueue(msg.devp);
break;
case MSGTYPE_MEDIA_REMOVED:
msg.devp->has_media = false;
update_device(msg.devp);
}
}
SLIST_FOREACH_SAFE(ep, &clis, next, ep_tmp) {
if (!FD_ISSET(ep->cli->s, &rset))
continue;
csock = ep->cli->s;
if (serve_client(ep->cli) == -1 || ep->cli->s == -1) {
/* Disconnected */
FD_CLR(csock, &allset);
(void)close(csock);
del_client(ep->cli);
}
}
}
/* NOTREACHED */
return (0);
}
static void
usage()
{
(void)fprintf(stderr, "Usage: %s [-fh]\n" \
" -f: Run %s in foreground.\n", PROGRAM, PROGRAM);
exit(1);
}
static void
cleanup(int unused)
{
bool force, unmount_on_exit;
const char *val = dsbcfg_getval(cfg, CFG_UNMOUNT_ON_EXIT).string;
struct devlist_s *ep;
unmount_on_exit = force = false;
if (strcmp(val, "yes") == 0)
unmount_on_exit = true;
else if (strcmp(val, "force") == 0)
unmount_on_exit = force = true;
SLIST_FOREACH(ep, &devs, next) {
if (!ep->devp->mounted || !unmount_on_exit ||
!ep->devp->dsbmd_mounted)
continue;
logprintx("Unmounting %s", ep->devp->mntpt);
(void)unmount(ep->devp->mntpt, force ? MNT_FORCE : 0);
}
cliprintbc(NULL, "S");
logprintx("%s exited", PROGRAM);
pidfile_remove(pfh);
exit(EXIT_SUCCESS);
}
static void
lockpidfile()
{
/* Check if deamon is already running. */
if ((pfh = pidfile_open(PATH_PID_FILE, 0600, NULL)) == NULL) {
if (errno == EEXIST)
errx(EXIT_FAILURE, "%s is already running.", PROGRAM);
err(EXIT_FAILURE, "Failed to create PID file.");
}
pidfile_write(pfh);
}
static sdev_t *
lookup_dev(const char *dev)
{
sdev_t *devp;
struct devlist_s *ep;
dev = devbasename(dev);
SLIST_FOREACH(ep, &devs, next) {
devp = ep->devp;
if (strcmp(dev, devbasename(devp->dev)) == 0)
return (devp);
}
return (NULL);
}
static client_t *
add_client(int socket)
{
int n, saved_errno;
char **p;
uid_t uid;
gid_t gid, gids[24];
client_t *cp;
static int id = 1;
struct group *grp;
struct passwd *pw;
struct devlist_s *ep;
struct clilist_s *cep;
cp = NULL; errno = 0;
if (getpeereid(socket, &uid, &gid) == -1 ||
(pw = getpwuid(uid)) == NULL)
goto error;
gids[0] = gid;
for (n = 1; (grp = getgrent()) != NULL;) {
for (p = grp->gr_mem; p != NULL && *p != NULL; p++) {
if (strcmp(pw->pw_name, *p) == 0) {
if (grp->gr_gid != gid)
gids[n++] = grp->gr_gid;
break;
}
}
}
/* Terminate GID list. */
gids[n] = (gid_t)-1;
endgrent();
endpwent();
if (!check_permission(uid, gids)) {
char msg[64];
(void)snprintf(msg, sizeof(msg) - 1, "E:code=%d\n",
ERR_PERMISSION_DENIED);
(void)send_string(socket, msg);
(void)close(socket);
logprintx("Client with UID %d rejected", uid);
return (NULL);
}
if ((cp = malloc(sizeof(client_t))) == NULL ||
(cep = malloc(sizeof(struct clilist_s))) == NULL)
die("malloc()");
cep->cli = cp;
if ((cp->gids = malloc((n + 1) * sizeof(gid_t))) == NULL)
goto error;
(void)memcpy(cp->gids, gids, n * sizeof(gid_t));
cp->s = socket;
cp->id = id++;
cp->uid = uid;
cp->slen = cp->rd = 0;
cp->overflow = false;
/*
* Send the client the current list of mountable devs.
*/
SLIST_FOREACH(ep, &devs, next) {
if (ep->devp->visible)
notify(cp, ep->devp, true);
}
/* Terminate device list output. */
cliprint(cp, "=");
SLIST_INSERT_HEAD(&clis, cep, next);
logprintx("Client with UID %d connected", uid);
return (cp);
error:
saved_errno = errno;
if (cp != NULL)
free(cp->gids);
free(cp);
(void)close(socket);
errno = saved_errno;
return (NULL);
}
static void
del_client(client_t *cli)
{
struct clilist_s *ep;
SLIST_FOREACH(ep, &clis, next) {
if (cli == ep->cli)
break;
}
if (ep == NULL)
return;
logprintx("Client with UID %d disconnected", cli->uid);
if (cli->s > -1)
(void)close(cli->s);
free(cli->gids);
free(cli);
SLIST_REMOVE(&clis, ep, clilist_s, next);
}
/*
* Return a value > 0 if a newline terminated string is available.
* Return 0 if there is no new line terminated string available.
* Return -1 if an error occured, or the connection was terminated.
*/
static int
client_readln(client_t *cli, int *error)
{
int i, n;
char c;
bool badchar;
size_t len, bufsz = sizeof(cli->buf) - 1;
*error = 0;
for (;;) {
if ((n = read(cli->s, &c, 1)) == -1) {
if (errno == EINTR) {
continue;
} else if (errno == EAGAIN) {
/* No more bytes available. */
return (0);
} else {
*error = SOCK_ERR_IO_ERROR;
return (-1);
}
} else if (n == 0) {
*error = SOCK_ERR_CONN_CLOSED;
return (-1);
}
if (c == '\n')
break;
if (cli->overflow)
return (0);
cli->buf[cli->rd++] = (char)c;
if (cli->rd == bufsz) {
cli->overflow = true;
cli->rd = 0;
}
}
/* c == '\n' */
if (!cli->overflow)
cli->buf[cli->rd] = '\0';
len = cli->rd; cli->rd = 0;
if (cli->overflow) {
cli->overflow = false;
cliprint(cli, "E:code=%d\n", ERR_STRING_TOO_LONG);
} else {
badchar = false;
for (i = 0; i < len; i++) {
if (!isprint(cli->buf[i]))
badchar = true;
}
if (badchar)
cliprint(cli, "E:code=%d\n", ERR_BAD_STRING);
else
return (1);
}
return (0);
}
static client_t *
process_connreq(int ls)
{
int cs;
client_t *cli;
socklen_t clen;
struct sockaddr_un c_addr;
cs = accept(ls, (struct sockaddr *)&c_addr, &clen);
if (cs == -1) {
switch (errno) {
case EINTR: case EWOULDBLOCK: case ECONNABORTED:
return (NULL);
default:
die("accept()");
}
}
if ((cli = add_client(cs)) == NULL) {
if (errno != 0)
logprint("add_client()");
return (NULL);
}
return (cli);
}
static char *
read_devd_event(int s, int *error)
{
int n, rd;
static int bufsz = 0;
static char seq[1024], *lnbuf = NULL;
struct iovec iov;
struct msghdr msg;
if (lnbuf == NULL) {
if ((lnbuf = malloc(_POSIX2_LINE_MAX)) == NULL)
return (NULL);
bufsz = _POSIX2_LINE_MAX;
}
iov.iov_len = sizeof(seq);
iov.iov_base = seq;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
for (n = rd = *error = 0;;) {
msg.msg_name = msg.msg_control = NULL;
msg.msg_namelen = msg.msg_controllen = 0;
if ((n = recvmsg(s, &msg, 0)) == (ssize_t)-1) {
if (errno == EINTR)
continue;
if (errno == ECONNRESET || errno == ENOTCONN) {
*error = SOCK_ERR_CONN_CLOSED;
return (NULL);
}
if (errno == EAGAIN)
return (NULL);
die("recvmsg()");
} else if (n == 0 && rd == 0) {
*error = SOCK_ERR_CONN_CLOSED;
return (NULL);
}
if (rd + n + 1 > bufsz) {
if ((lnbuf = realloc(lnbuf, rd + n + 65)) == NULL)
die("realloc()");
bufsz = rd + n + 65;
}
(void)memcpy(lnbuf + rd, seq, n);
rd += n; lnbuf[rd] = '\0';
if (msg.msg_flags & MSG_TRUNC) {
logprint("recvmsg(): Message truncated");
return (rd > 0 ? lnbuf : NULL);
} else if (msg.msg_flags & MSG_EOR)
return (lnbuf);
}
return (NULL);
}
static void
parse_devd_event(char *str)
{
char *next, *var, *val, *p;
const char *cs;
devdevent.system = devdevent.subsystem = devdevent.type = "";
devdevent.scsi_sense = devdevent.device = devdevent.cdev = "";
while (*str != '\0' && (val = strchr(str, '=')) != NULL) {
while (isspace(*str))
str++;
*val++ = '\0'; var = str;
if (*val == '"') {
++val;
cs = "\"";
} else
cs = " \t\n";
next = val + strcspn(val, cs);
if (*next != '\0')
*next++ = '\0';
str = next;
if (strcmp(var, "system") == 0)
devdevent.system = val;
else if (strcmp(var, "subsystem") == 0)
devdevent.subsystem = val;
else if (strcmp(var, "type") == 0)
devdevent.type = val;
else if (strcmp(var, "cdev") == 0)
devdevent.cdev = val;
else if (strcmp(var, "device") == 0)
devdevent.device = val;
else if (strcmp(var, "scsi_sense") == 0) {
/* Skip SCSI return code. */
if ((p = strchr(val, ' ')) != NULL)
devdevent.scsi_sense = ++p;
else {
logprintx("Invalid SCSI sense data?: %s", val);
devdevent.scsi_sense = val;
}
}
}
}
static void *
poll_thr(void *socket)
{
int s;
sdev_t *devp;
struct ipcmsg_s msg;
s = *(int *)socket;
for (;; sleep(3)) {
(void)pthread_mutex_lock(&pollqmtx);
if (SLIST_EMPTY(&pollq)) {
/* Queue empty. Terminate thread */
(void)pthread_mutex_unlock(&pollqmtx);
pthread_exit(NULL);
}
while ((devp = media_changed()) != NULL) {
msg.type = MSGTYPE_UPDATE_DEVICE;
msg.devp = devp;
(void)pthread_mutex_lock(&ipcsockmtx);
(void)send(s, &msg, sizeof(msg), MSG_EOR);
(void)pthread_mutex_unlock(&ipcsockmtx);
}
(void)pthread_mutex_unlock(&pollqmtx);
}
return (NULL);
}
static void *
devd_thr(void *ipcsock)
{
int ipc, devd, error;
char *ev;
sdev_t *devp;
fd_set rset, _rset;
struct ipcmsg_s msg;
ipc = *(int *)ipcsock;
if ((devd = devd_connect()) == -1)
die("Couldn't connect to %s", PATH_DEVD_SOCKET);
FD_ZERO(&_rset); FD_SET(devd, &_rset);
for (;;) {
rset = _rset;
if (select(devd + 1, &rset, NULL, NULL, NULL) == -1) {
if (errno == EINTR)
continue;
die("select()");