/* ftpparse.c, ftpparse.h: library for parsing FTP LIST responses
20001223
D. J. Bernstein, djb@cr.yp.to
http://cr.yp.to/ftpparse.html
Commercial use is fine, if you let me know what programs you're using this in.
Currently covered formats:
EPLF.
UNIX ls, with or without gid.
Microsoft FTP Service.
Windows NT FTP Server.
VMS.
WFTPD.
NetPresenz (Mac).
NetWare.
MSDOS.
Definitely not covered:
Long VMS filenames, with information split across two lines.
NCSA Telnet FTP server. Has LIST = NLST (and bad NLST for directories).
*/
#include <ftpparse.h>
static long totai(long year,long month,long mday)
{
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(void)
{
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);
/* assumes the right time_t, counting seconds. */
/* base may be slightly off if time_t counts non-leap seconds. */
flagneedbase = 0;
}
static void initnow(void)
{
long day;
long year;
initbase();
now = time((time_t *) 0) - base;
if (flagneedcurrentyear) {
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(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;
}
}
static int check(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(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(char *buf,int len)
{
long u = 0;
while (len-- > 0)
u = u * 10 + (*buf++ - '0');
return u;
}
int ftpparse(struct ftpparse *fp,char *buf,int len)
{
int i;
int j;
int state;
long size;
long year;
long month;
long mday;
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 = getlong(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 = getlong(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 = getlong(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_BINARY;
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;
}
/* MSDOS format */
/* 04-27-00 09:09PM <DIR> licensed */
/* 07-18-00 10:16AM <DIR> pub */
/* 04-14-00 03:47PM 589 readme.htm */
if ((*buf >= '0') && (*buf <= '9')) {
i = 0;
j = 0;
while (buf[j] != '-') if (++j == len) return 0;
month = getlong(buf + i,j - i) - 1;
while (buf[j] == '-') if (++j == len) return 0;
i = j;
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;
year = getlong(buf + i,j - i);
if (year < 50) year += 2000;
if (year < 1000) year += 1900;
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] != 'A') && (buf[j] != 'P')) if (++j == len) return 0;
minute = getlong(buf + i,j - i);
if (hour == 12) hour = 0;
if (buf[j] == 'A') if (++j == len) return 0;
if (buf[j] == 'P') { hour += 12; if (++j == len) return 0; }
if (buf[j] == 'M') if (++j == len) return 0;
while (buf[j] == ' ') if (++j == len) return 0;
if (buf[j] == '<') {
fp->flagtrycwd = 1;
while (buf[j] != ' ') if (++j == len) return 0;
}
else {
i = j;
while (buf[j] != ' ') if (++j == len) return 0;
fp->size = getlong(buf + i,j - i);
fp->sizetype = FTPPARSE_SIZE_BINARY;
fp->flagtryretr = 1;
}
while (buf[j] == ' ') if (++j == len) return 0;
fp->name = buf + j;
fp->namelen = len - j;
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;
}
