prozilla/libprozilla/src/ftpparse.c
2010-09-18 12:55:05 +02:00

640 lines
15 KiB
C

/* ftpparse.c, ftpparse.h: library for parsing FTP LIST responses
D. J. Bernstein, djb@pobox.com
19970712 (doc updated 19970810)
Commercial use is fine, if you let me know what programs you're using this in.
Currently covered:
EPLF.
UNIX ls, with or without gid.
Microsoft FTP Service.
Windows NT FTP Server.
VMS.
WFTPD (DOS).
NetPresenz (Mac).
NetWare.
Definitely not covered:
Long VMS filenames, with information split across two lines.
NCSA Telnet FTP server. Has LIST = NLST (and bad NLST for directories).
Written for maximum portability, but tested only under UNIX so far.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*
* HAVE_CONFIG_H
*/
#include <sys/types.h>
#include <time.h>
#include "ftpparse.h"
static long totai(year, month, mday)
long year;
long month;
long mday;
{
/*
* adapted from datetime_untai()
*/
/*
* about 100x faster than typical mktime()
*/
long result;
if (month >= 2)
month -= 2;
else
{
month += 10;
--year;
}
result = (mday - 1) * 10 + 5 + 306 * month;
result /= 10;
if (result == 365)
{
year -= 3;
result = 1460;
}
else
result += 365 * (year % 4);
year /= 4;
result += 1461 * (year % 25);
year /= 25;
if (result == 36524)
{
year -= 3;
result = 146096;
}
else
{
result += 36524 * (year % 4);
}
year /= 4;
result += 146097 * (year - 5);
result += 11017;
return result * 86400;
}
static int flagneedbase = 1;
static time_t base; /*
* time() value on this OS at the beginning of 1970 TAI
*/
static long now; /*
* current time
*/
static int flagneedcurrentyear = 1;
static long currentyear; /*
* approximation to current year
*/
static void initbase()
{
struct tm *t;
if (!flagneedbase)
return;
base = 0;
t = gmtime(&base);
base =
-(totai(t->tm_year + 1900, t->tm_mon, t->tm_mday) +
t->tm_hour * 3600 + t->tm_min * 60 + t->tm_sec);
/*
* time_t is assumed to be measured in TAI seconds.
*/
/*
* base may be slightly off if time_t is measured in UTC seconds.
*/
/*
* Typical software naively claims to use UTC but actually uses TAI.
*/
flagneedbase = 0;
}
static void initnow()
{
long day;
long year;
initbase();
now = time((time_t *)0) - base;
if (flagneedcurrentyear)
{
/*
* adapted from datetime_tai()
*/
day = now / 86400;
if ((now % 86400) < 0)
--day;
day -= 11017;
year = 5 + day / 146097;
day = day % 146097;
if (day < 0)
{
day += 146097;
--year;
}
year *= 4;
if (day == 146096)
{
year += 3;
day = 36524;
}
else
{
year += day / 36524;
day %= 36524;
}
year *= 25;
year += day / 1461;
day %= 1461;
year *= 4;
if (day == 1460)
{
year += 3;
day = 365;
}
else
{
year += day / 365;
day %= 365;
}
day *= 10;
if ((day + 5) / 306 >= 10)
++year;
currentyear = year;
flagneedcurrentyear = 0;
}
}
/* UNIX ls does not show the year for dates in the last six months. */
/* So we have to guess the year. */
/* Apparently NetWare uses ``twelve months'' instead of ``six months''; ugh. */
/* Some versions of ls also fail to show the year for future dates. */
static long guesstai(month, mday)
long month;
long mday;
{
long year;
long t;
initnow();
for (year = currentyear - 1; year < currentyear + 100; ++year)
{
t = totai(year, month, mday);
if (now - t < 350 * 86400)
return t;
}
/* Added by Grendel */
return 0;
}
static int check(buf, monthname)
char *buf;
char *monthname;
{
if ((buf[0] != monthname[0]) && (buf[0] != monthname[0] - 32))
return 0;
if ((buf[1] != monthname[1]) && (buf[1] != monthname[1] - 32))
return 0;
if ((buf[2] != monthname[2]) && (buf[2] != monthname[2] - 32))
return 0;
return 1;
}
static char *months[12] = {
"jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct",
"nov", "dec"
};
static int getmonth(buf, len)
char *buf;
int len;
{
int i;
if (len == 3)
for (i = 0; i < 12; ++i)
if (check(buf, months[i]))
return i;
return -1;
}
static long getlong(buf, len)
char *buf;
int len;
{
long u = 0;
while (len-- > 0)
u = u * 10 + (*buf++ - '0');
return u;
}
static long long getlonglong(buf, len)
char *buf;
int len;
{
long long u = 0;
while (len-- > 0)
u = u * 10 + (*buf++ - '0');
return u;
}
int ftpparse(fp, buf, len)
struct ftpparse *fp;
char *buf;
int len;
{
int i;
int j;
int state;
off_t size = -1;
long year;
long month = -1;
long mday = -1;
long hour;
long minute;
fp->name = 0;
fp->namelen = 0;
fp->flagtrycwd = 0;
fp->flagtryretr = 0;
fp->sizetype = FTPPARSE_SIZE_UNKNOWN;
fp->size = 0;
fp->mtimetype = FTPPARSE_MTIME_UNKNOWN;
fp->mtime = 0;
fp->idtype = FTPPARSE_ID_UNKNOWN;
fp->id = 0;
fp->idlen = 0;
if (len < 2) /*
* an empty name in EPLF, with no info, could be 2 chars
*/
return 0;
switch (*buf)
{
/*
* see http://pobox.com/~djb/proto/eplf.txt
*/
/*
* "+i8388621.29609,m824255902,/,\tdev"
*/
/*
* "+i8388621.44468,m839956783,r,s10376,\tRFCEPLF"
*/
case '+':
i = 1;
for (j = 1; j < len; ++j)
{
if (buf[j] == 9)
{
fp->name = buf + j + 1;
fp->namelen = len - j - 1;
return 1;
}
if (buf[j] == ',')
{
switch (buf[i])
{
case '/':
fp->flagtrycwd = 1;
break;
case 'r':
fp->flagtryretr = 1;
break;
case 's':
fp->sizetype = FTPPARSE_SIZE_BINARY;
fp->size = getlonglong(buf + i + 1, j - i - 1);
break;
case 'm':
fp->mtimetype = FTPPARSE_MTIME_LOCAL;
initbase();
fp->mtime = base + getlong(buf + i + 1, j - i - 1);
break;
case 'i':
fp->idtype = FTPPARSE_ID_FULL;
fp->id = buf + i + 1;
fp->idlen = j - i - 1;
}
i = j + 1;
}
}
return 0;
/*
* UNIX-style listing, without inum and without blocks
*/
/*
* "-rw-r--r-- 1 root other 531 Jan 29 03:26 README"
*/
/*
* "dr-xr-xr-x 2 root other 512 Apr 8 1994 etc"
*/
/*
* "dr-xr-xr-x 2 root 512 Apr 8 1994 etc"
*/
/*
* "lrwxrwxrwx 1 root other 7 Jan 25 00:17 bin -> usr/bin"
*/
/*
* Also produced by Microsoft's FTP servers for Windows:
*/
/*
* "---------- 1 owner group 1803128 Jul 10 10:18 ls-lR.Z"
*/
/*
* "d--------- 1 owner group 0 May 9 19:45 Softlib"
*/
/*
* Also WFTPD for MSDOS:
*/
/*
* "-rwxrwxrwx 1 noone nogroup 322 Aug 19 1996 message.ftp"
*/
/*
* Also NetWare:
*/
/*
* "d [R----F--] supervisor 512 Jan 16 18:53 login"
*/
/*
* "- [R----F--] rhesus 214059 Oct 20 15:27 cx.exe"
*/
/*
* Also NetPresenz for the Mac:
*/
/*
* "-------r-- 326 1391972 1392298 Nov 22 1995 MegaPhone.sit"
*/
/*
* "drwxrwxr-x folder 2 May 10 1996 network"
*/
case 'b':
case 'c':
case 'd':
case 'l':
case 'p':
case 's':
case '-':
if (*buf == 'd')
fp->flagtrycwd = 1;
if (*buf == '-')
fp->flagtryretr = 1;
if (*buf == 'l')
fp->flagtrycwd = fp->flagtryretr = 1;
state = 1;
i = 0;
for (j = 1; j < len; ++j)
if ((buf[j] == ' ') && (buf[j - 1] != ' '))
{
switch (state)
{
case 1: /*
* skipping perm
*/
state = 2;
break;
case 2: /*
* skipping nlink
*/
state = 3;
if ((j - i == 6) && (buf[i] == 'f')) /*
* for NetPresenz
*/
state = 4;
break;
case 3: /*
* skipping uid
*/
state = 4;
break;
case 4: /*
* getting tentative size
*/
size = getlonglong(buf + i, j - i);
state = 5;
break;
case 5: /*
* searching for month, otherwise getting tentative size
*/
month = getmonth(buf + i, j - i);
if (month >= 0)
state = 6;
else
size = getlonglong(buf + i, j - i);
break;
case 6: /*
* have size and month
*/
mday = getlong(buf + i, j - i);
state = 7;
break;
case 7: /*
* have size, month, mday
*/
if ((j - i == 4) && (buf[i + 1] == ':'))
{
hour = getlong(buf + i, 1);
minute = getlong(buf + i + 2, 2);
fp->mtimetype = FTPPARSE_MTIME_REMOTEMINUTE;
initbase();
fp->mtime =
base + guesstai(month,
mday) + hour * 3600 +
minute * 60;
}
else if ((j - i == 5) && (buf[i + 2] == ':'))
{
hour = getlong(buf + i, 2);
minute = getlong(buf + i + 3, 2);
fp->mtimetype = FTPPARSE_MTIME_REMOTEMINUTE;
initbase();
fp->mtime =
base + guesstai(month,
mday) + hour * 3600 +
minute * 60;
}
else if (j - i >= 4)
{
year = getlong(buf + i, j - i);
fp->mtimetype = FTPPARSE_MTIME_REMOTEDAY;
initbase();
fp->mtime = base + totai(year, month, mday);
}
else
return 0;
fp->name = buf + j + 1;
fp->namelen = len - j - 1;
state = 8;
break;
case 8: /*
* twiddling thumbs
*/
break;
}
i = j + 1;
while ((i < len) && (buf[i] == ' '))
++i;
}
if (state != 8)
return 0;
fp->size = size;
fp->sizetype = FTPPARSE_SIZE_ASCII;
if (*buf == 'l')
for (i = 0; i + 3 < fp->namelen; ++i)
if (fp->name[i] == ' ')
if (fp->name[i + 1] == '-')
if (fp->name[i + 2] == '>')
if (fp->name[i + 3] == ' ')
{
fp->namelen = i;
break;
}
/*
* eliminate extra NetWare spaces
*/
if ((buf[1] == ' ') || (buf[1] == '['))
if (fp->namelen > 3)
if (fp->name[0] == ' ')
if (fp->name[1] == ' ')
if (fp->name[2] == ' ')
{
fp->name += 3;
fp->namelen -= 3;
}
return 1;
}
/*
* MultiNet (some spaces removed from examples)
*/
/*
* "00README.TXT;1 2 30-DEC-1996 17:44 [SYSTEM] (RWED,RWED,RE,RE)"
*/
/*
* "CORE.DIR;1 1 8-SEP-1996 16:09 [SYSTEM] (RWE,RWE,RE,RE)"
*/
/*
* and non-MutliNet VMS:
*/
/*
* "CII-MANUAL.TEX;1 213/216 29-JAN-1996 03:33:12 [ANONYMOU,ANONYMOUS] (RWED,RWED,,)"
*/
for (i = 0; i < len; ++i)
if (buf[i] == ';')
break;
if (i < len)
{
fp->name = buf;
fp->namelen = i;
if (i > 4)
if (buf[i - 4] == '.')
if (buf[i - 3] == 'D')
if (buf[i - 2] == 'I')
if (buf[i - 1] == 'R')
{
fp->namelen -= 4;
fp->flagtrycwd = 1;
}
if (!fp->flagtrycwd)
fp->flagtryretr = 1;
while (buf[i] != ' ')
if (++i == len)
return 0;
while (buf[i] == ' ')
if (++i == len)
return 0;
while (buf[i] != ' ')
if (++i == len)
return 0;
while (buf[i] == ' ')
if (++i == len)
return 0;
j = i;
while (buf[j] != '-')
if (++j == len)
return 0;
mday = getlong(buf + i, j - i);
while (buf[j] == '-')
if (++j == len)
return 0;
i = j;
while (buf[j] != '-')
if (++j == len)
return 0;
month = getmonth(buf + i, j - i);
if (month < 0)
return 0;
while (buf[j] == '-')
if (++j == len)
return 0;
i = j;
while (buf[j] != ' ')
if (++j == len)
return 0;
year = getlong(buf + i, j - i);
while (buf[j] == ' ')
if (++j == len)
return 0;
i = j;
while (buf[j] != ':')
if (++j == len)
return 0;
hour = getlong(buf + i, j - i);
while (buf[j] == ':')
if (++j == len)
return 0;
i = j;
while ((buf[j] != ':') && (buf[j] != ' '))
if (++j == len)
return 0;
minute = getlong(buf + i, j - i);
fp->mtimetype = FTPPARSE_MTIME_REMOTEMINUTE;
initbase();
fp->mtime =
base + totai(year, month, mday) + hour * 3600 + minute * 60;
return 1;
}
/*
* Some useless lines, safely ignored:
*/
/*
* "Total of 11 Files, 10966 Blocks." (VMS)
*/
/*
* "total 14786" (UNIX)
*/
/*
* "DISK$ANONFTP:[ANONYMOUS]" (VMS)
*/
/*
* "Directory DISK$PCSA:[ANONYM]" (VMS)
*/
return 0;
}