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mc/vfs/utilvfs.c

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/* Utilities for VFS modules.
Copyright (C) 1988, 1992 Free Software Foundation
Copyright (C) 1995, 1996 Miguel de Icaza
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU Library 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include <config.h>
#include <ctype.h>
#include "utilvfs.h"
#include "vfs.h"
/* Extract the hostname and username from the path */
/* path is in the form: [user@]hostname:port/remote-dir, e.g.:
*
* ftp://sunsite.unc.edu/pub/linux
* ftp://miguel@sphinx.nuclecu.unam.mx/c/nc
* ftp://tsx-11.mit.edu:8192/
* ftp://joe@foo.edu:11321/private
* ftp://joe:password@foo.se
*
* Returns g_malloc()ed host, user and pass they are present.
* If the user is empty, e.g. ftp://@roxanne/private, and URL_ALLOW_ANON
* is not set, then the current login name is supplied.
*
* Return value is a g_malloc()ed string with the pathname relative to the
* host.
*/
#ifdef USE_NETCODE
char *
vfs_split_url (const char *path, char **host, char **user, int *port,
char **pass, int default_port, int flags)
{
struct passwd *passwd_info;
char *dir, *colon, *inner_colon, *at, *rest;
char *retval;
char *pcopy = g_strdup (path);
char *pend = pcopy + strlen (pcopy);
if (pass)
*pass = NULL;
*port = default_port;
*user = NULL;
retval = NULL;
dir = pcopy;
if (!(flags & URL_NOSLASH)) {
/* locate path component */
while (*dir != PATH_SEP && *dir)
dir++;
if (*dir) {
retval = g_strdup (dir);
*dir = 0;
} else
retval = g_strdup (PATH_SEP_STR);
}
/* search for any possible user */
at = strchr (pcopy, '@');
/* We have a username */
if (at) {
*at = 0;
inner_colon = strchr (pcopy, ':');
if (inner_colon) {
*inner_colon = 0;
inner_colon++;
if (pass)
*pass = g_strdup (inner_colon);
}
if (*pcopy != 0)
*user = g_strdup (pcopy);
if (pend == at + 1)
rest = at;
else
rest = at + 1;
} else
rest = pcopy;
if (!*user && !(flags & URL_ALLOW_ANON)) {
passwd_info = getpwuid (geteuid ());
if (passwd_info && passwd_info->pw_name)
*user = g_strdup (passwd_info->pw_name);
else {
/* This is very unlikely to happen */
*user = g_strdup ("anonymous");
}
endpwent ();
}
/* Check if the host comes with a port spec, if so, chop it */
colon = strchr (rest, ':');
if (colon) {
*colon = 0;
if (sscanf (colon + 1, "%d", port) == 1) {
if (*port <= 0 || *port >= 65536)
*port = default_port;
} else {
while (*(++colon)) {
switch (*colon) {
case 'C':
*port = 1;
break;
case 'r':
*port = 2;
break;
}
}
}
}
if (host)
*host = g_strdup (rest);
g_free (pcopy);
return retval;
}
#endif /* USE_NETCODE */
/*
* Look up a user or group name from a uid/gid, maintaining a cache.
* FIXME, for now it's a one-entry cache.
* FIXME2, the "-993" is to reduce the chance of a hit on the first lookup.
* This file should be modified for non-unix systems to do something
* reasonable.
*/
#ifndef TUNMLEN
#define TUNMLEN 256
#endif
#ifndef TGNMLEN
#define TGNMLEN 256
#endif
#define myuid ( my_uid < 0? (my_uid = getuid()): my_uid )
#define mygid ( my_gid < 0? (my_gid = getgid()): my_gid )
int
vfs_finduid (char *uname)
{
static int saveuid = -993;
static char saveuname[TUNMLEN];
static int my_uid = -993;
struct passwd *pw;
if (uname[0] != saveuname[0] /* Quick test w/o proc call */
||0 != strncmp (uname, saveuname, TUNMLEN)) {
strncpy (saveuname, uname, TUNMLEN);
pw = getpwnam (uname);
if (pw) {
saveuid = pw->pw_uid;
} else {
saveuid = myuid;
}
}
return saveuid;
}
int
vfs_findgid (char *gname)
{
static int savegid = -993;
static char savegname[TGNMLEN];
static int my_gid = -993;
struct group *gr;
if (gname[0] != savegname[0] /* Quick test w/o proc call */
||0 != strncmp (gname, savegname, TUNMLEN)) {
strncpy (savegname, gname, TUNMLEN);
gr = getgrnam (gname);
if (gr) {
savegid = gr->gr_gid;
} else {
savegid = mygid;
}
}
return savegid;
}
/*
* Create a temporary file with a name resembling the original.
* This is needed e.g. for local copies requested by extfs.
* Some extfs scripts may look at the extension.
* We also protect stupid scripts agains dangerous names.
*/
int
vfs_mkstemps (char **pname, const char *prefix, const char *basename)
{
const unsigned char *p;
char *suffix, *q;
int shift;
int fd;
/* Strip directories */
p = strrchr (basename, PATH_SEP);
if (!p)
p = basename;
else
p++;
/* Protection against very long names */
shift = strlen (p) - (MC_MAXPATHLEN - 16);
if (shift > 0)
p += shift;
suffix = g_malloc (MC_MAXPATHLEN);
/* Protection against unusual characters */
q = suffix;
while (*p && (*p != '#')) {
if (strchr (".-_@", *p) || isalnum (*p))
*q++ = *p;
p++;
}
*q = 0;
fd = mc_mkstemps (pname, prefix, suffix);
g_free (suffix);
return fd;
}
/* Parsing code is used by ftpfs, fish and extfs */
#define MAXCOLS 30
static char *columns[MAXCOLS]; /* Points to the string in column n */
static int column_ptr[MAXCOLS]; /* Index from 0 to the starting positions of the columns */
int
vfs_split_text (char *p)
{
char *original = p;
int numcols;
memset (columns, 0, sizeof (columns));
for (numcols = 0; *p && numcols < MAXCOLS; numcols++) {
while (*p == ' ' || *p == '\r' || *p == '\n') {
*p = 0;
p++;
}
columns[numcols] = p;
column_ptr[numcols] = p - original;
while (*p && *p != ' ' && *p != '\r' && *p != '\n')
p++;
}
return numcols;
}
static int
is_num (int idx)
{
char *column = columns[idx];
if (!column || column[0] < '0' || column[0] > '9')
return 0;
return 1;
}
/* Return 1 for MM-DD-YY and MM-DD-YYYY */
static int
is_dos_date (const char *str)
{
int len;
if (!str)
return 0;
len = strlen (str);
if (len != 8 && len != 10)
return 0;
if (str[2] != str[5])
return 0;
if (!strchr ("\\-/", (int) str[2]))
return 0;
return 1;
}
static int
is_week (const char *str, struct tm *tim)
{
static const char *week = "SunMonTueWedThuFriSat";
char *pos;
if (!str)
return 0;
if ((pos = strstr (week, str)) != NULL) {
if (tim != NULL)
tim->tm_wday = (pos - week) / 3;
return 1;
}
return 0;
}
static int
is_month (const char *str, struct tm *tim)
{
static const char *month = "JanFebMarAprMayJunJulAugSepOctNovDec";
char *pos;
if (!str)
return 0;
if ((pos = strstr (month, str)) != NULL) {
if (tim != NULL)
tim->tm_mon = (pos - month) / 3;
return 1;
}
return 0;
}
/*
* Check for possible locale's abbreviated month name (Jan..Dec).
* Any 3 bytes long string without digit and control characters.
* isalpha() is locale specific, so it cannot be used if current
* locale is "C" and ftp server use Cyrillic.
* TODO: Punctuation characters also cannot be part of month name.
* NB: It is assumed there are no whitespaces in month.
*/
static int
is_localized_month (const unsigned char *month)
{
int i = 0;
while ((i < 3) && *month && !isdigit (*month) && !iscntrl (*month)) {
i++;
month++;
}
return ((i == 3) && (*month == 0));
}
static int
is_time (const char *str, struct tm *tim)
{
char *p, *p2;
if (!str)
return 0;
if ((p = strchr (str, ':')) && (p2 = strrchr (str, ':'))) {
if (p != p2) {
if (sscanf
(str, "%2d:%2d:%2d", &tim->tm_hour, &tim->tm_min,
&tim->tm_sec) != 3)
return 0;
} else {
if (sscanf (str, "%2d:%2d", &tim->tm_hour, &tim->tm_min) != 2)
return 0;
}
} else
return 0;
return 1;
}
static int
is_year (char *str, struct tm *tim)
{
long year;
if (!str)
return 0;
if (strchr (str, ':'))
return 0;
if (strlen (str) != 4)
return 0;
if (sscanf (str, "%ld", &year) != 1)
return 0;
if (year < 1900 || year > 3000)
return 0;
tim->tm_year = (int) (year - 1900);
return 1;
}
/*
* FIXME: this is broken. Consider following entry:
* -rwx------ 1 root root 1 Aug 31 10:04 2904 1234
* where "2904 1234" is filename. Well, this code decodes it as year :-(.
*/
int
vfs_parse_filetype (char c)
{
switch (c) {
case 'd':
return S_IFDIR;
case 'b':
return S_IFBLK;
case 'c':
return S_IFCHR;
case 'l':
return S_IFLNK;
case 's': /* Socket */
#ifdef S_IFSOCK
return S_IFSOCK;
#else
/* If not supported, we fall through to IFIFO */
return S_IFIFO;
#endif
case 'D': /* Solaris door */
#ifdef S_IFDOOR
return S_IFDOOR;
#else
return S_IFIFO;
#endif
case 'p':
return S_IFIFO;
case 'm':
case 'n': /* Don't know what these are :-) */
case '-':
case '?':
return S_IFREG;
default:
return -1;
}
}
int
vfs_parse_filemode (const char *p)
{ /* converts rw-rw-rw- into 0666 */
int res = 0;
switch (*(p++)) {
case 'r':
res |= 0400;
break;
case '-':
break;
default:
return -1;
}
switch (*(p++)) {
case 'w':
res |= 0200;
break;
case '-':
break;
default:
return -1;
}
switch (*(p++)) {
case 'x':
res |= 0100;
break;
case 's':
res |= 0100 | S_ISUID;
break;
case 'S':
res |= S_ISUID;
break;
case '-':
break;
default:
return -1;
}
switch (*(p++)) {
case 'r':
res |= 0040;
break;
case '-':
break;
default:
return -1;
}
switch (*(p++)) {
case 'w':
res |= 0020;
break;
case '-':
break;
default:
return -1;
}
switch (*(p++)) {
case 'x':
res |= 0010;
break;
case 's':
res |= 0010 | S_ISGID;
break;
case 'l': /* Solaris produces these */
case 'S':
res |= S_ISGID;
break;
case '-':
break;
default:
return -1;
}
switch (*(p++)) {
case 'r':
res |= 0004;
break;
case '-':
break;
default:
return -1;
}
switch (*(p++)) {
case 'w':
res |= 0002;
break;
case '-':
break;
default:
return -1;
}
switch (*(p++)) {
case 'x':
res |= 0001;
break;
case 't':
res |= 0001 | S_ISVTX;
break;
case 'T':
res |= S_ISVTX;
break;
case '-':
break;
default:
return -1;
}
return res;
}
/* This function parses from idx in the columns[] array */
int
vfs_parse_filedate (int idx, time_t *t)
{
char *p;
struct tm tim;
int d[3];
int got_year = 0;
int l10n = 0; /* Locale's abbreviated month name */
time_t current_time;
struct tm *local_time;
/* Let's setup default time values */
current_time = time (NULL);
local_time = localtime (&current_time);
tim.tm_mday = local_time->tm_mday;
tim.tm_mon = local_time->tm_mon;
tim.tm_year = local_time->tm_year;
tim.tm_hour = 0;
tim.tm_min = 0;
tim.tm_sec = 0;
tim.tm_isdst = -1; /* Let mktime() try to guess correct dst offset */
p = columns[idx++];
/* We eat weekday name in case of extfs */
if (is_week (p, &tim))
p = columns[idx++];
/* Month name */
if (is_month (p, &tim)) {
/* And we expect, it followed by day number */
if (is_num (idx))
tim.tm_mday = (int) atol (columns[idx++]);
else
return 0; /* No day */
} else {
/* We usually expect:
Mon DD hh:mm
Mon DD YYYY
But in case of extfs we allow these date formats:
Mon DD YYYY hh:mm
Mon DD hh:mm YYYY
Wek Mon DD hh:mm:ss YYYY
MM-DD-YY hh:mm
where Mon is Jan-Dec, DD, MM, YY two digit day, month, year,
YYYY four digit year, hh, mm, ss two digit hour, minute or second. */
/* Special case with MM-DD-YY or MM-DD-YYYY */
if (is_dos_date (p)) {
p[2] = p[5] = '-';
if (sscanf (p, "%2d-%2d-%d", &d[0], &d[1], &d[2]) == 3) {
/* Months are zero based */
if (d[0] > 0)
d[0]--;
if (d[2] > 1900) {
d[2] -= 1900;
} else {
/* Y2K madness */
if (d[2] < 70)
d[2] += 100;
}
tim.tm_mon = d[0];
tim.tm_mday = d[1];
tim.tm_year = d[2];
got_year = 1;
} else
return 0; /* sscanf failed */
} else {
/* Locale's abbreviated month name followed by day number */
if (is_localized_month (p) && (is_num (idx++)))
l10n = 1;
else
return 0; /* unsupported format */
}
}
/* Here we expect to find time and/or year */
if (is_num (idx)) {
if (is_time (columns[idx], &tim)
|| (got_year = is_year (columns[idx], &tim))) {
idx++;
/* This is a special case for ctime() or Mon DD YYYY hh:mm */
if (is_num (idx) && (columns[idx + 1][0])) {
if (got_year) {
if (is_time (columns[idx], &tim))
idx++; /* time also */
} else {
if ((got_year = is_year (columns[idx], &tim)))
idx++; /* year also */
}
}
} /* only time or date */
} else
return 0; /* Nor time or date */
/*
* If the date is less than 6 months in the past, it is shown without year
* other dates in the past or future are shown with year but without time
* This does not check for years before 1900 ... I don't know, how
* to represent them at all
*/
if (!got_year && local_time->tm_mon < 6
&& local_time->tm_mon < tim.tm_mon
&& tim.tm_mon - local_time->tm_mon >= 6)
tim.tm_year--;
if (l10n || (*t = mktime (&tim)) < 0)
*t = 0;
return idx;
}
int
vfs_parse_ls_lga (const char *p, struct stat *s, char **filename,
char **linkname)
{
int idx, idx2, num_cols;
int i;
char *p_copy = NULL;
char *t = NULL;
const char *line = p;
if (strncmp (p, "total", 5) == 0)
return 0;
if ((i = vfs_parse_filetype (*(p++))) == -1)
goto error;
s->st_mode = i;
if (*p == ' ') /* Notwell 4 */
p++;
if (*p == '[') {
if (strlen (p) <= 8 || p[8] != ']')
goto error;
/* Should parse here the Notwell permissions :) */
if (S_ISDIR (s->st_mode))
s->st_mode |=
(S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR | S_IXUSR | S_IXGRP
| S_IXOTH);
else
s->st_mode |= (S_IRUSR | S_IRGRP | S_IROTH | S_IWUSR);
p += 9;
} else {
if ((i = vfs_parse_filemode (p)) == -1)
goto error;
s->st_mode |= i;
p += 9;
/* This is for an extra ACL attribute (HP-UX) */
if (*p == '+')
p++;
}
p_copy = g_strdup (p);
num_cols = vfs_split_text (p_copy);
s->st_nlink = atol (columns[0]);
if (s->st_nlink <= 0)
goto error;
if (!is_num (1))
s->st_uid = vfs_finduid (columns[1]);
else
s->st_uid = (uid_t) atol (columns[1]);
/* Mhm, the ls -lg did not produce a group field */
for (idx = 3; idx <= 5; idx++)
if (is_month (columns[idx], NULL) || is_week (columns[idx], NULL)
|| is_dos_date (columns[idx])
|| is_localized_month (columns[idx]))
break;
if (idx == 6
|| (idx == 5 && !S_ISCHR (s->st_mode) && !S_ISBLK (s->st_mode)))
goto error;
/* We don't have gid */
if (idx == 3
|| (idx == 4 && (S_ISCHR (s->st_mode) || S_ISBLK (s->st_mode))))
idx2 = 2;
else {
/* We have gid field */
if (is_num (2))
s->st_gid = (gid_t) atol (columns[2]);
else
s->st_gid = vfs_findgid (columns[2]);
idx2 = 3;
}
/* This is device */
if (S_ISCHR (s->st_mode) || S_ISBLK (s->st_mode)) {
int maj, min;
if (!is_num (idx2) || sscanf (columns[idx2], " %d,", &maj) != 1)
goto error;
if (!is_num (++idx2) || sscanf (columns[idx2], " %d", &min) != 1)
goto error;
#ifdef HAVE_STRUCT_STAT_ST_RDEV
s->st_rdev = ((maj & 0xff) << 8) | (min & 0xffff00ff);
#endif
s->st_size = 0;
} else {
/* Common file size */
if (!is_num (idx2))
goto error;
s->st_size = (size_t) atol (columns[idx2]);
#ifdef HAVE_STRUCT_STAT_ST_RDEV
s->st_rdev = 0;
#endif
}
idx = vfs_parse_filedate (idx, &s->st_mtime);
if (!idx)
goto error;
/* Use resulting time value */
s->st_atime = s->st_ctime = s->st_mtime;
/* s->st_dev and s->st_ino must be initialized by vfs_s_new_inode () */
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
s->st_blksize = 512;
#endif
#ifdef HAVE_STRUCT_STAT_ST_BLOCKS
s->st_blocks = (s->st_size + 511) / 512;
#endif
for (i = idx + 1, idx2 = 0; i < num_cols; i++)
if (strcmp (columns[i], "->") == 0) {
idx2 = i;
break;
}
if (((S_ISLNK (s->st_mode) || (num_cols == idx + 3 && s->st_nlink > 1))) /* Maybe a hardlink? (in extfs) */
&&idx2) {
if (filename) {
*filename =
g_strndup (p + column_ptr[idx],
column_ptr[idx2] - column_ptr[idx] - 1);
}
if (linkname) {
t = g_strdup (p + column_ptr[idx2 + 1]);
*linkname = t;
}
} else {
/* Extract the filename from the string copy, not from the columns
* this way we have a chance of entering hidden directories like ". ."
*/
if (filename) {
/*
* filename = g_strdup (columns [idx++]);
*/
t = g_strdup (p + column_ptr[idx]);
*filename = t;
}
if (linkname)
*linkname = NULL;
}
if (t) {
int p = strlen (t);
if ((--p > 0) && (t[p] == '\r' || t[p] == '\n'))
t[p] = 0;
if ((--p > 0) && (t[p] == '\r' || t[p] == '\n'))
t[p] = 0;
}
g_free (p_copy);
return 1;
error:
{
static int errorcount = 0;
if (++errorcount < 5) {
message (1, _("Cannot parse:"),
(p_copy && *p_copy) ? p_copy : line);
} else if (errorcount == 5)
message (1, _("Error"),
_("More parsing errors will be ignored."));
}
g_free (p_copy);
return 0;
}
void
vfs_die (const char *m)
{
message (1, _("Internal error:"), m);
exit (1);
}
char *
vfs_get_password (char *msg)
{
return (char *) input_dialog (msg, _("Password:"), INPUT_PASSWORD);
}
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