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ftpparse.c
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/* ftpparse.c, ftpparse.h: library for
* parsing FTP LIST responses
*
* Written by Uwe Ohse, 2002-07-12.
* Strongly influences by Daniel J.
* Bernsteins ftpparse.c.
*
* placed in the public domain.
*/
/*
* Currently covered:
* EPLF.
* UNIX ls, with or without gid.
* different Windows and DOS FTP
* servers. VMS, but not CMS. NetPresenz
* (Mac). NetWare.
*/
#include <time.h> /* gmtime, time_t, time() */
#include "lib/str.h"
#include "lib/case.h"
#include "lib/uint64.h"
static int
my_byte_equal(const char* s, unsigned int n, const char* t) {
unsigned int i;
for(i = 0; i < n; i++)
if(s[i] != t[i])
return 0;
return 1;
}
static int
fix_year(unsigned long* year) {
if(*year < 70)
*year += 2000;
else if(*year < 100)
*year += 1900;
else if(*year < 1970)
return 0;
return 1;
}
/* scan_ulong with bound-check */
static unsigned int
get_ulong(const char* p, unsigned int len, unsigned long* ul) {
unsigned long u = 0;
unsigned int i;
for(i = 0; i < len; i++) {
if(p[i] > '9' || p[i] < '0')
break;
u *= 10;
u += p[i] - '0';
}
*ul = u;
return i;
}
static unsigned int
get_uint64(const char* p, unsigned int len, uint64* ul) {
uint64 u = 0;
unsigned int i;
for(i = 0; i < len; i++) {
if(p[i] > '9' || p[i] < '0')
break;
u *= 10;
u += p[i] - '0';
}
*ul = u;
return i;
}
/* 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
guess_year(unsigned long month, unsigned long day) {
static long this_year;
static struct tai yearstart;
struct tai x;
struct tai now;
tai_now(&now);
if(!this_year) {
struct tai n;
tai_now(&n);
this_year = 1970;
for(;;) {
utcdate2tai(&yearstart, this_year + 1, 0, 1, 0, 0, 0);
if(tai_less(&n, &yearstart))
break;
this_year++;
}
}
utcdate2tai(&x, this_year, month, day, 0, 0, 0);
if(tai_less(&now, &x))
return this_year - 1;
return this_year;
}
static int
getmod(struct tai* t, const unsigned char* p, unsigned int l) {
unsigned int i;
unsigned long year, mon, day, hour, min, sec;
year = mon = day = hour = min = sec = 0;
if(l < 14)
return 0;
for(i = 0; i < l; i++) {
unsigned int u;
if(p[i] < '0' || p[i] > '9')
return 0;
u = (p[i] - '0');
switch(i) {
case 0:
case 1:
case 2:
case 3:
year *= 10;
year += u;
break;
case 4:
case 5:
mon *= 10;
mon += u;
break;
case 6:
case 7:
day *= 10;
day += u;
break;
case 8:
case 9:
hour *= 10;
hour += u;
break;
case 10:
case 11:
min *= 10;
min += u;
break;
case 12:
case 13:
sec *= 10;
sec += u;
break;
}
}
utcdate2tai(t, year, mon - 1, day, hour, min, sec);
return 1;
}
static const char* months[12] = {"jan", "feb", "mar", "apr", "may", "jun", "jul", "aug", "sep", "oct", "nov", "dec"};
static int
get_month(char* buf, unsigned int len) {
int i;
if(len < 3)
return -1;
#define CMP(x) (months[i][x] == buf[x] || months[i][x] == buf[x] + 32)
for(i = 0; i < 12; ++i)
if(CMP(0) && CMP(1) && CMP(2))
return i;
return -1;
}
/* see
* http://cr.yp.to/ftp/list/eplf.html */
static int
parse_eplf(struct ftpparse* f, char* buf, unsigned int len) {
unsigned int start, pos;
unsigned long ul;
if(buf[0] != '+')
return 0;
start = 1;
for(pos = 1; pos < len; pos++) {
if('\t' == buf[pos]) {
f->name = buf + pos + 1;
f->namelen = len - pos - 1;
if(!f->namelen)
return 0; /* huh? */
f->format = FTPPARSE_FORMAT_EPLF;
return 1;
}
if(',' != buf[pos])
continue;
switch(buf[start]) {
case '/': f->flagtrycwd = 1; break;
case 'r': f->flagtryretr = 1; break;
case 's':
if(pos - start - 1 == 0)
return 0;
if(get_uint64(buf + start + 1, pos - start - 1, &f->size) != pos - start - 1)
return 0;
f->sizetype = FTPPARSE_SIZE_BINARY;
break;
case 'm':
if(pos - start - 1 == 0)
return 0;
if(get_ulong(buf + start + 1, pos - start - 1, &ul) != pos - start - 1)
return 0;
tai_unix(&f->mtime, ul);
f->mtimetype = FTPPARSE_MTIME_LOCAL;
break;
case 'i':
/* refuse zero bytes length ids
*/
if(pos - start - 1 == 0)
return 0;
f->idtype = FTPPARSE_ID_FULL;
f->id = buf + start + 1;
f->idlen = pos - start - 1;
break;
}
start = pos + 1;
}
return 0;
}
static int
scan_time(const char* buf, const unsigned int len, unsigned long* h, unsigned long* m, unsigned long* s, int* type) {
/* 11:48:54 */
/* 01:48:54 */
/* 1:48:54 */
/* 11:48 */
/* 11:48PM */
/* 11:48AM */
/* 11:48:54PM */
/* 11:48:54AM */
unsigned int x;
unsigned int y;
*h = *m = *s = 0;
x = get_ulong(buf, len, h);
if(len == x)
return 0;
if(!x || x > 2)
return 0;
if(':' != buf[x])
return 0;
if(len == ++x)
return 0;
y = get_ulong(buf + x, len - x, m);
if(y != 2)
return 0;
x += y;
if(x != len && ':' == buf[x]) {
if(len == ++x)
return 0;
y = get_ulong(buf + x, len - x, s);
if(y != 2)
return 0;
x += y;
*type = FTPPARSE_MTIME_REMOTESECOND;
} else
*type = FTPPARSE_MTIME_REMOTEMINUTE;
if(x != len && ('A' == buf[x] || 'P' == buf[x])) {
if('P' == buf[x])
*h += 12;
x++;
if(len == x)
return 0;
if('M' != buf[x])
return 0;
x++;
if(len == x)
return 0;
}
if(len == x || buf[x] == ' ')
return x;
return 0;
}
/* 04-27-00 09:09PM <DIR>
* licensed */
/* 07-18-00 10:16AM <DIR> pub
*/
/* 04-14-00 03:47PM 589 readme.htm */
/* note the mon-day-year! */
static int
parse_msdos(struct ftpparse* f, char* buf, unsigned int len) {
unsigned int pos, start;
unsigned int state;
unsigned long mon;
unsigned long day;
unsigned long year;
unsigned long hour;
unsigned long min;
unsigned long sec;
int mtimetype;
unsigned int x;
uint64 size = 0;
unsigned int flagtrycwd = 0;
unsigned int flagtryretr = 0;
int maxspaces = 0; /* to keep leading spaces
before dir/file name */
for(state = start = pos = 0; pos < len; pos++) {
switch(state) {
case 0: /* month */
if('-' == buf[pos]) {
state++;
if(pos == start)
return 0;
if(get_ulong(buf + start, pos - start, &mon) != pos - start)
return 0;
start = pos + 1;
}
break;
case 1: /* day */
if('-' == buf[pos]) {
state++;
if(pos == start)
return 0;
if(get_ulong(buf + start, pos - start, &day) != pos - start)
return 0;
start = pos + 1;
}
break;
case 2: /* year */
if(' ' == buf[pos]) {
state++;
if(pos - start != 2 && pos - start != 4)
return 0;
if(get_ulong(buf + start, pos - start, &year) != pos - start)
return 0;
start = pos + 1;
if(!fix_year(&year))
return 0;
}
break;
case 3: /* spaces */
if(' ' == buf[pos])
continue;
state++;
start = pos;
/* FALL THROUGH */
case 4: /* time */
x = scan_time(buf + start, len - pos, &hour, &min, &sec, &mtimetype);
if(!x)
return 0;
pos += x;
if(pos == len)
return 0;
state++;
break;
case 5: /* spaces */
if(' ' == buf[pos])
continue;
state++;
start = pos;
/* FALL THROUGH */
case 6: /* <DIR> or length */
if(' ' == buf[pos]) {
if(get_uint64(buf + start, pos - start, &size) != pos - start) {
if(pos - start < 5 || !my_byte_equal(buf + start, 5, "<DIR>"))
return 0;
flagtrycwd = 1;
maxspaces = 10;
} else {
flagtryretr = 1;
maxspaces = 1;
}
state++;
start = pos;
}
break;
case 7: /* spaces */
if(' ' == buf[pos])
if(--maxspaces)
continue;
state++;
start = pos;
/* FALL THROUGH */
case 8: /* file / dir name */
f->name = buf + start;
f->namelen = len - pos;
f->flagtrycwd = flagtrycwd;
f->flagtryretr = flagtryretr;
f->mtimetype = mtimetype;
if(flagtryretr) {
f->size = size;
f->sizetype = FTPPARSE_SIZE_BINARY;
}
if(!fix_year(&year))
return 0;
utcdate2tai(&f->mtime, year, mon - 1, day, hour, min, sec);
return 1;
}
}
return 0;
}
#define MAXWORDS 10
static unsigned int
dosplit(char* buf, int len, char* p[], unsigned int l[]) {
unsigned int count = 0;
int inword = 0;
int pos;
int start;
for(pos = start = 0; pos < len; pos++) {
if(inword) {
if(' ' == buf[pos]) {
inword = 0;
l[count++] = pos - start;
if(count == MAXWORDS) {
l[count - 1] = len - start;
break;
}
}
} else {
if(' ' != buf[pos]) {
inword = 1;
start = pos;
p[count] = buf + pos;
}
}
}
if(inword) {
l[count] = buf + pos - p[count];
count++;
}
return count;
}
static int
parse_multinet(struct ftpparse* f, char* p[], int l[], unsigned int count) {
/* "CORE.DIR;1 1 8-SEP-1996
* 16:09 [SYSTEM] (RWE,RWE,RE,RE)" */
/* "[VMSSERV.FILES]ALARM.DIR;1 1/3
* 5-MAR-1993 18:09:" */
int mon;
unsigned long day;
unsigned long year;
unsigned long hour;
unsigned long min;
unsigned long sec;
int mtimetype;
int x;
char* q;
int m;
if(count < 4)
return 0;
q = p[2];
m = l[2];
x = get_ulong(q, m, &day);
if(!x || x > 2 || day > 31)
return 0;
if(q[x] != '-')
return 0;
q += x + 1;
m -= x + 1;
mon = get_month(q, m);
if(-1 == mon)
return 0;
if(q[3] != '-')
return 0;
q += 4;
if(m < 5)
return 0;
m -= 4;
x = get_ulong(q, m, &year);
if(!x || q[x] != ' ')
return 0;
if(!fix_year(&year))
return 0;
x = scan_time(p[3], l[3], &hour, &min, &sec, &mtimetype);
if(x != l[3])
return 0;
f->mtimetype = mtimetype;
;
utcdate2tai(&f->mtime, year, mon, day, hour, min, sec);
for(x = 0; x < l[0]; x++)
if(p[0][x] == ';')
break;
if(x > 4)
if(p[0][x - 4] == '.' && p[0][x - 3] == 'D' && p[0][x - 2] == 'I' && p[0][x - 1] == 'R') {
x -= 4;
f->flagtrycwd = 1;
}
if(!f->flagtrycwd)
f->flagtryretr = 1;
f->namelen = x;
f->name = p[0];
if(f->name[0] == '[') {
/* [dir]file.maybe */
unsigned int y;
for(y = 1; y < f->namelen; y++)
if(f->name[y] == ']')
break;
if(y != f->namelen)
y++; /* skip ] */
if(y != f->namelen) {
f->name += y;
f->namelen -= y;
}
}
return 1;
}
static int
parse_unix(struct ftpparse* f, char* buf, int len, char* p[], int l[], unsigned int count) {
/* the horror ... */
/* this list has been taken from
* Daniel Bernsteins ftpparse.c */
/* 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" */
/*restructured: */
/* -PERM 1 user group 531 Jan
* 29 03:26 README */
/* dPERM 2 user group 512 Apr
* 8 1994 etc */
/* dPERM 2 user 512 Apr 8
* 1994 etc */
/* lPERM 1 user group 7 Jan
* 25 00:17 bin -> usr/bin */
/* -PERM 1 user group 1803128
* Jul 10 10:18 ls-lR.Z */
/* dPERM 1 user group 0 May
* 9 19:45 Softlib */
/* -PERM 1 user group 322 Aug
* 19 1996 message.ftp */
/* d [R----F--] user 512 Jan 16
* 18:53 login */
/* - [R----F--] user 214059 Oct 20
* 15:27 cx.exe */
/* -PERM 326 NUMB NUMBER Nov 22
* 1995 MegaPhone.sit */
/* dPERM folder 2 May 10 1996
* network */
/* handled as: */
/* dPERM folder 2 May 10
* 1996 network */
/* 0 1 2 3 4 5
* 6 7 8 */
/* note the date system: MON DAY
* [YEAR|TIME] */
int mon = -1; /* keep gcc quiet */
unsigned long day;
unsigned long year;
unsigned long hour;
unsigned long min;
unsigned long sec;
uint64 size;
int flagtrycwd = 0;
int flagtryretr = 0;
unsigned int i;
int x;
int mtimetype;
int may_have_size = 0;
switch(p[0][0]) {
case 'd': flagtrycwd = 1; break;
case '-': flagtryretr = 1; break;
case 'l': flagtryretr = flagtrycwd = 1; break;
}
i = 3;
if(l[1] == 6 && my_byte_equal(p[1], l[1], "folder"))
i = 2;
x = get_uint64(p[i], l[i], &size);
if(x == l[i])
may_have_size = 1;
i++;
while(i < count) {
mon = get_month(p[i], l[i]);
if(-1 == mon) {
/* may be size */
x = get_uint64(p[i], l[i], &size);
if(x == l[i])
may_have_size = 1;
}
i++;
if(-1 != mon)
break;
}
if(i == count)
return 0;
x = get_ulong(p[i], l[i], &day);
if(!x)
return 0;
if(p[i][x] != ' ')
return 0;
if(++i == count)
return 0;
x = get_ulong(p[i], l[i], &year);
if(!x)
return 0;
if(p[i][x] == ':') {
x = scan_time(p[i], l[i], &hour, &min, &sec, &mtimetype);
if(x != l[i])
return 0;
year = guess_year(mon, day);
} else {
mtimetype = FTPPARSE_MTIME_REMOTEDAY;
hour = min = sec = 0;
/* may be this case: */
/* - [-RWCE-F-] mlm 11820 Feb 3
* 93 12:00 drivers.doc */
if(i + 2 < count) {
x = scan_time(p[i + 1], l[i + 1], &hour, &min, &sec, &mtimetype);
if(x != l[i + 1]) {
hour = min = sec = 0;
mtimetype = FTPPARSE_MTIME_REMOTEDAY;
} else
i++;
}
if(!fix_year(&year))
return 0;
}
if(++i == count)
return 0;
/* note: dosplit eats spaces - but we
* need them here. So go back. */
f->name = p[i];
f->namelen = buf + len - p[i];
/* "-rwxrwxrwx 1 noone nogroup
* 322 Aug 19 1996 message.ftp" */
/* "-rwxrwxrwx 1 noone nogroup
* 322 Aug 19 1996 spacy" */
/* but: */
/* "d [R----F--] supervisor 512
* Jan 16 18:53 login" */
if(p[0][1] != ' ') {
while(f->name[-2] == ' ') {
f->name--;
f->namelen++;
}
}
if(may_have_size) {
f->sizetype = FTPPARSE_SIZE_BINARY;
f->size = size;
}
f->flagtryretr = flagtryretr;
f->flagtrycwd = flagtrycwd;
utcdate2tai(&f->mtime, year, mon, day, hour, min, sec);
f->mtimetype = mtimetype;
f->format = FTPPARSE_FORMAT_LS; /* for
programs
dealing
with
symlinks */
if('l' == *buf) {
unsigned int j;
for(j = 1; j < f->namelen - 4; j++) /* 1, -4: no empty names,
please */
if(f->name[j] == ' ' && f->name[j + 1] == '-' && f->name[j + 2] == '>' && f->name[j + 3] == ' ') {
f->symlink = f->name + j + 4;
f->symlinklen = f->namelen - j - 4;
f->namelen = j;
break;
}
}
return 1;
}
static int
parse_supertcp(struct ftpparse* f, char* p[], int l[], unsigned int count) {
unsigned long mon;
unsigned long day;
unsigned long year;
unsigned long hour;
unsigned long min;
unsigned long sec;
int mtimetype;
uint64 size = 0; /* optional, dirs */
int x;
int dir = 0;
/* CMT <DIR> 11-21-94
* 10:17 */
/* DESIGN1.DOC 11264
* 05-11-95 14:20 */
if(count < 4)
return 0;
x = scan_time(p[3], l[3], &hour, &min, &sec, &mtimetype);
if(x != l[3])
return 0;
x = get_ulong(p[2], l[2], &mon);
if(x != 2 || p[2][x] != '-')
return 0;
x++;
x += get_ulong(p[2] + x, l[2] - x, &day);
if(x != 5 || p[2][x] != '-')
return 0;
x++;
x += get_ulong(p[2] + x, l[2] - x, &year);
if((x != 8 && x != 10) || p[2][x] != ' ')
return 0;
if(!fix_year(&year))
return 0;
if(my_byte_equal(p[1], 5, "<DIR>"))
dir = 1;
else {
x = get_uint64(p[1], l[1], &size);
if(!x || p[1][x] != ' ')
return 0;
}
f->name = p[0];
f->namelen = l[0];
f->size = size;
if(!dir)
f->sizetype = FTPPARSE_SIZE_BINARY;
utcdate2tai(&f->mtime, year, mon, day, hour, min, sec);
f->mtimetype = mtimetype;
if(dir)
f->flagtrycwd = 1;
else
f->flagtryretr = 1;
return 1;
}
/* another bright re-invention of a
* broken wheel from the people, who
* made an art of it.
*/
static int
parse_os2(struct ftpparse* f, char* p[], int l[], unsigned int count) {
/* 0 DIR 04-11-95
* 16:26 ADDRESS 612 A 07-28-95
* 16:45 air_tra1.bag 310992 06-28-94
* 09:56 INSTALL.EXE
*/
unsigned long mon;
unsigned long day;
unsigned long year;
unsigned long hour;
unsigned long min;
unsigned long sec;
int mtimetype;
uint64 size;
int x;
unsigned int i;
int dir = 0;
if(count < 4)
return 0;
x = get_uint64(p[0], l[0], &size);
if(!x || p[0][x] != ' ')
return 0;
for(i = 1; i < count - 2; i++) {
x = get_ulong(p[i], l[i], &mon);
if(!x)
continue;
if(x != 2 || p[i][x] != '-')
return 0;
mon -= 1;
x++;
x += get_ulong(p[i] + x, l[i] - x, &day);
if(x != 5 || p[i][x] != '-')
return 0;
x++;
x += get_ulong(p[i] + x, l[i] - x, &year);
if(x != 8 || p[i][x] != ' ')
return 0;
if(!fix_year(&year))
return 0;
break;
}
if(i > 1)
if(my_byte_equal(p[i - 1], 3, "DIR"))
dir = 1;
i++;
if(i == count)
return 0;
x = scan_time(p[i], l[i], &hour, &min, &sec, &mtimetype);
if(x != l[i])
return 0;
i++;
if(i == count)
return 0;
f->name = p[i];
f->namelen = l[i];
if(dir) {
f->flagtrycwd = 1;
} else {
f->flagtryretr = 1;
f->sizetype = FTPPARSE_SIZE_BINARY;
f->size = size;
}
utcdate2tai(&f->mtime, year, mon, day, hour, min, sec);
f->mtimetype = mtimetype;
return 1;
}
#define SETUP() \
do { \
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; \
tai_uint(&fp->mtime, 0); \
fp->idtype = FTPPARSE_ID_UNKNOWN; \
fp->id = 0; \
fp->idlen = 0; \
fp->format = FTPPARSE_FORMAT_UNKNOWN; \
fp->flagbrokenmlsx = 0; \
fp->symlink = 0; \
fp->symlinklen = 0; \
} while(0)
int
ftpparse_mlsx(struct ftpparse* fp, char* x, int ll, int is_mlst) {
int i;
uint64 size;
struct tai mtime;
int flagtryretr = 0;
int flagtrycwd = 0;
char* id = 0;
int idlen = 0;
int mtimetype = FTPPARSE_MTIME_UNKNOWN;
int sizetype = FTPPARSE_SIZE_UNKNOWN;
int flagbrokenmlsx = 0;
SETUP();
if(is_mlst)
if(ll > 1) {
ll--;
x++;
}
if(ll < 2) /* empty facts, space,
one-byte-filename */
return 0;
for(i = 0; i < ll; i++) {
int j = 0, k = 0;
if(x[i] == ' ')
break; /* end of facts */
while(i + j < ll && x[i + j] != ';' && x[i + j] != ' ' && x[i + j] != '=')
j++;
if(i + j == ll)
return 0;
if(x[i + j] == ' ')
return 0;
if(x[i + j] == ';')
return 0;
/* x[i+j] is now '=' */
while(i + j + k < ll && x[i + j + k] != ';' && x[i + j + k] != ' ')
k++;
if(i + j + k == ll)
return 0;
/* x[i+j+k] is space or semicolon,
* so use of getlong is safe */
#define ISFACT(name) (j == sizeof(name) - 1 && case_startb(x + i, j, name))
if(ISFACT("size")) {