+/* This file is not part of Wget proper, but is included here with the
+ permission of the author. If you wish to use Wget without
+ ftpparse, undefine HAVE_FTPPARSE in ftp-ls.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. */
+
+#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;
+ }
+}
+
+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;
+}
+
+int ftpparse(fp,buf,len)
+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_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;
+}
projects / wget / commitdiff