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connect.c
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/*
* This source file is Copyright 1995 and 1996 by Evan Scott, apart from those sections which are
* explicitly described as otherwise.
* All rights reserved.
* Permission is granted to distribute this file provided no
* fees beyond distribution costs are levied.
*/
#include "FTPMount.h" /* 03-03-02 rri */
#include <ctype.h> // for isdigit() (RJF)
#include "tcp.h"
#include "site.h"
#include "split.h"
#include "ftpinfo.h"
#include "connect.h"
#include "request.h"
#include "strings.h"
#define ERROR_GARBAGE_RECEIVED 15
extern ftpinfo* get_info(site*, unsigned char*);
unsigned char* grow_info(unsigned char* a, unsigned char* b, int n)
/*
* concatenates a and b (not null terminated of length n) and returns
* an allocated string with the result. a is freed.
* a may be nil
* b may not
*/
{
unsigned char *c, *d;
int len;
if (a)
len = strlen(a);
else
len = 0;
len += n + 1;
c = (unsigned char *)allocate(len, V_cstr);
if (!c)
{
if (a)
deallocate(a, V_cstr);
return nil;
}
if (a)
{
strcpy(c, a);
d = c + strlen(c);
}
else
{
d = c;
}
if (n)
memcpy(d, b, n);
d[n] = 0;
if (a)
{
deallocate(a, V_cstr);
}
a = c;
while (*a)
{
if (*a == '\t') *a = ' '; /* hmmm */
if (*a == '\r') *a = '\n';
a++;
}
return c;
}
boolean substr(unsigned char* s, unsigned char* ss)
/*
* returns true if s contains ss (non-case-sensitive)
* s may be nil, in which case false is returned
*/
{
int len;
if (s == nil) return false;
len = strlen(ss);
while (*s)
{
if (strncasecmp(s, ss, len) == 0) return true;
s++;
}
return false;
}
void inform(struct IntuitionBase* IntuitionBase, unsigned char* title, unsigned char* text, unsigned char* site, unsigned long errno)
{
struct EasyStruct es;
es.es_StructSize = sizeof(struct EasyStruct);
es.es_Flags = 0;
es.es_Title = title;
es.es_GadgetFormat = strings[MSG_OK];
es.es_TextFormat = text;
EasyRequest(nil, &es, nil, site, errno);
}
tcpmessage* new_message(site* sp)
/*
* get a new tcpmessage
*/
{
tcpmessage* intr;
struct MsgPort* sync;
verify(sp, V_site);
intr = sp->intr;
verify(intr, V_tcpmessage);
sync = sp->sync;
/* "re-use" intr to get a new tcpmessage */
intr->command = TCP_NEWMESSAGE;
intr->header.mn_ReplyPort = sync;
PutMsg(tcp, &intr->header);
WaitPort(sync);
GetMsg(sync); /* this _should_ never block */
return (tcpmessage *)intr->data;
}
void interrupt_message(site* sp, tcpmessage* tm)
/*
* interrupt tm
*/
{
tcpmessage* intr;
struct MsgPort* sync;
verify(sp, V_site);
verify(tm, V_tcpmessage);
intr = sp->intr;
verify(intr, V_tcpmessage);
sync = sp->sync;
intr->command = TCP_INTERRUPT;
intr->header.mn_ReplyPort = sync;
intr->interrupt = tm;
PutMsg(tcp, &intr->header);
/*
* NB: I could probably assume tm->header.mn_ReplyPort == sync safely, but
* this seems a bit more "correctly generic" (although potentially more buggy)
*/
WaitPort(tm->header.mn_ReplyPort);
GetMsg(tm->header.mn_ReplyPort); /* aborted tm coming back */
WaitPort(sync);
GetMsg(sync); /* intr coming back successful */
return;
}
unsigned long control_write(site* sp, unsigned char* command, unsigned long csig)
/*
* writes the string command to the control connection
* Inputs:
* sp : site pointer
* command : null terminated command string
* csig : additional cancel signals, 0 is ok
*
* returns the tcp error
*/
{
tcpmessage* tm;
struct MsgPort* sync;
unsigned long signals, rsigs;
verify(sp, V_site);
truth(command != nil);
// truth(sp->connected);
tm = sp->control;
verify(tm, V_tcpmessage);
sync = sp->sync;
// kein \n am Ende, da Kommando dies enthält
// Achtung: hier wird auch "PASS xx" ausgegeben!
DS(kprintf("TCP control_write (site %s) %s", sp->host, command))
tm->command = TCP_WRITE;
tm->length = strlen(command);
tm->flags = 0;
tm->data = command;
tm->header.mn_ReplyPort = sync;
csig |= sp->abort_signals | sp->disconnect_signals;
signals = (1 << sync->mp_SigBit) | csig;
PutMsg(tcp, &tm->header);
do
{
rsigs = Wait(signals);
if (rsigs & csig)
{
interrupt_message(sp, tm);
if (rsigs & sp->disconnect_signals)
{
disconnect(sp);
}
return ERROR_INTERRUPTED;
}
}
while (!GetMsg(sync));
return tm->error;
}
unsigned long make_connection(site* sp, tcpmessage* tm, unsigned char* addr, unsigned short port, unsigned long csig)
/*
* make a connection to a remote host
* Inputs:
* sp : site pointer
* tm : an unused tcpmessage
* addr : null terminated string address
* port : port number to connect to
* csig : additional cancel signals (may be 0)
*
* Returns:
* standard tcp error
*/
{
struct MsgPort* sync;
unsigned long signals, rsigs, asigs;
verify(sp, V_site);
verify(tm, V_tcpmessage);
truth(addr != nil);
sync = sp->sync;
tm->header.mn_ReplyPort = sync;
tm->command = TCP_CONNECT;
tm->data = addr;
tm->port.w = port;
tm->flags = 0;
asigs = csig | sp->abort_signals | sp->disconnect_signals;
signals = asigs | (1 << sync->mp_SigBit);
PutMsg(tcp, &tm->header);
do
{
rsigs = Wait(signals);
if (rsigs & asigs)
{
interrupt_message(sp, tm);
if (rsigs & sp->disconnect_signals)
{
disconnect(sp);
}
return ERROR_INTERRUPTED;
}
}
while (!GetMsg(sync));
return tm->error;
}
void break_connection(site* sp, tcpmessage* tm)
/*
* do a TCP_CLOSE on tm
*/
{
struct MsgPort* sync;
verify(sp, V_site);
verify(tm, V_tcpmessage);
sync = sp->sync;
tm->command = TCP_CLOSE;
tm->header.mn_ReplyPort = sync;
PutMsg(tcp, &tm->header);
WaitPort(sync);
GetMsg(sync);
return;
}
boolean passive_response(unsigned char* s, unsigned char* addr, unsigned short* portp)
/*
* parse the response to a PASV command
* Inputs:
* s : the response to the PASV (null terminated)
* addr : a buffer to hold the address (should be as long as s)
* portp : where to put the port number
*
* Returns:
* true if it was a valid PASV response
*/
{
unsigned char* t;
unsigned short ncommas, portn;
truth(s != nil);
truth(addr != nil);
truth(portp != nil);
// Antwortstring enthält \n
DS(kprintf("passive_response %s", s))
while (*s && *s != '(')
s++;
if (!*s)
return false;
/* first calculate port number ... skip the first 4 commas */
ncommas = 0;
t = s;
while (*t && *t != ')' && ncommas < 4)
{
if (*t == ',')
ncommas++;
t++;
}
portn = atoi(t) * 256; /* possibly a more thorough check of whether these are legit numbers */
while (*t && *t != ',' && *t != ')')
t++;
if (*t == ',')
portn += atoi(t + 1);
/*
* now copy the first 4 fields to addr, changing commas to periods
* (hopefully making a legitimate ip address)
*/
DS(t = addr)
ncommas = 0;
s++; /* move s past the '(' */
while (*s && ncommas < 4)
{
if (*s == ',')
{
ncommas++;
if (ncommas == 4)
*addr = 0;
else
*addr++ = '.';
s++;
}
else
{
*addr++ = *s++;
}
}
*portp = portn;
DS(kprintf(" -> %s:%ld\n", t, (int)portn))
return true;
}
unsigned long response(site* sp, unsigned long csig, unsigned char** infop, unsigned char* code)
/*
* reads response from remote server on sp->control
* Inputs:
* sp : site pointer
* csig : cancel signals (in addition to standard sp->abort etc ... usually a window) 0 is ok.
* infop : pointer to a string pointer to store the servers response message
* code : 3 byte array for the response code (eg 257 "/usr/dm/pathname" directory created)
*
* Returns:
* standard tcp error code with the additional error ERROR_GARBAGE_RECEIVED
*/
{
tcpmessage* tm;
struct MsgPort* sync;
unsigned long signals, rsigs, asigs;
unsigned char *info, *z;
verify(sp, V_site);
truth(code != nil);
truth(infop != nil);
*infop = nil;
tm = sp->control;
sync = sp->sync;
verify(tm, V_tcpmessage);
asigs = csig | sp->disconnect_signals | sp->abort_signals; /* abort signals */
signals = asigs | (1 << sync->mp_SigBit);
tm->command = TCP_READ;
tm->flags = FLAG_READLINE;
tm->data = sp->read_buffer;
tm->length = READ_BUFFER_LENGTH;
tm->header.mn_ReplyPort = sync;
PutMsg(tcp, &tm->header);
do
{
rsigs = Wait(signals);
if (rsigs & asigs)
{
state_change(sp, SS_ABORTING);
interrupt_message(sp, tm);
/* cancelling the read of the response is guaranteed fatal anyway ... but ... */
if (rsigs & sp->disconnect_signals)
{
disconnect(sp);
}
return ERROR_INTERRUPTED;
}
}
while (!GetMsg(sync));
if (tm->error != NO_ERROR)
{
show_int(tm->error);
return tm->error;
}
z = sp->read_buffer;
if (tm->result < 4 ||
z[0] < '0' || z[0] > '9' ||
z[1] < '0' || z[1] > '9' ||
z[2] < '0' || z[2] > '9')
{
show_int(tm->result);
return ERROR_GARBAGE_RECEIVED;
}
code[0] = z[0];
code[1] = z[1];
code[2] = z[2];
info = grow_info(nil, &z[4], tm->result - 4);
if (z[3] == '-')
{ /* we have a continuation message */
while (1)
{
PutMsg(tcp, &tm->header);
do
{
rsigs = Wait(signals);
if (rsigs & asigs)
{
state_change(sp, SS_ABORTING);
if (info)
deallocate(info, V_cstr);
interrupt_message(sp, tm);
if (rsigs & sp->disconnect_signals)
{
disconnect(sp);
}
return ERROR_INTERRUPTED;
}
}
while (!GetMsg(sync));
if (tm->error != NO_ERROR)
{ /* tell them about the error */
if (info)
deallocate(info, V_cstr);
return tm->error;
}
if (tm->result < 4)
{ /* not enough to even check if codes are equal */
info = grow_info(info, z, tm->result);
continue;
}
if (z[0] == code[0] &&
z[1] == code[1] &&
z[2] == code[2])
{
info = grow_info(info, &z[4], tm->result - 4);
if (z[3] == ' ') break; /* end of continuation */
}
else
{
info = grow_info(info, z, tm->result);
}
}
}
// Antwort enthält \n
DS(kprintf("response = %s", info))
*infop = info;
return NO_ERROR;
}
unsigned short numeric_reply(unsigned char* s)
{
return (unsigned short)((s[0] - '0') * 100 + (s[1] - '0') * 10 + (s[2] - '0'));
}
boolean retry_cancel(struct IntuitionBase* IntuitionBase, unsigned char* title, unsigned char* info)
/*
* paged information with retry/cancel buttons
* returns true for retry
* info may be nil (well, sortof)
*/
{
unsigned char *z, *s, tmp;
struct EasyStruct es;
int nlines;
es.es_StructSize = sizeof(struct EasyStruct);
es.es_Flags = 0;
es.es_Title = title;
es.es_TextFormat = "%s";
if (info)
z = info;
else
z = strings[MSG_UNKNOWN];
more:
s = z;
nlines = 0;
while (*z && nlines < MORE_LINES)
{
if (*z == '\n') nlines++;
z++;
}
if (*z)
{
es.es_GadgetFormat = strings[MSG_RETRY_MORE_CANCEL];
}
else
{
es.es_GadgetFormat = strings[MSG_RETRY_CANCEL];
}
tmp = *z;
*z = 0;
switch (EasyRequest(nil, &es, nil, s))
{
case 0: /* cancel */
*z = tmp;
return false;
case 1: /* retry */
*z = tmp;
return true;
case 2: /* more */
*z = tmp;
if (!*z) return true;
goto more;
}
/* 2005-05-14 ABA : unreachable */
return false;
}
void ok(struct IntuitionBase* IntuitionBase, unsigned char* title, unsigned char* info)
/*
* paged information with ok button
* info may be nil (sortof)
*/
{
unsigned char *z, *s, tmp;
struct EasyStruct es;
int nlines;
es.es_StructSize = sizeof(struct EasyStruct);
es.es_Flags = 0;
es.es_Title = title;
es.es_TextFormat = "%s";
if (info)
z = info;
else
z = strings[MSG_UNKNOWN];
more:
s = z;
nlines = 0;
while (*z && nlines < MORE_LINES)
{
if (*z == '\n') nlines++;
z++;
}
if (*z)
{
es.es_GadgetFormat = strings[MSG_MORE_OK];
}
else
{
es.es_GadgetFormat = strings[MSG_OK];
}
tmp = *z;
*z = 0;
if (EasyRequest(nil, &es, nil, s) && tmp)
{
*z = tmp;
goto more;
}
*z = tmp;
return;
}
void disconnect(site* sp)
/*
* rudely close control connection and clean up state information on site sp
*/
{
tcpmessage* tm;
struct MsgPort* sync;
verify(sp, V_site);
if (!sp->connected) return;
sync = sp->sync;
DS(kprintf("** disconnect site %s\n", sp->host))
state_change(sp, SS_DISCONNECTING);
tm = sp->cfile; /* file open, have to close it */
if (tm)
{
verify(tm, V_tcpmessage);
verify(sp->file_list, V_file_info);
tm->command = TCP_CLOSE;
tm->header.mn_ReplyPort = sync;
PutMsg(tcp, &tm->header); /* send CLOSE on file tm */
WaitPort(sync);
GetMsg(sync);
tm->command = TCP_DISPOSE;
PutMsg(tcp, &tm->header);
sp->cfile = nil;
deallocate(sp->file_list, V_file_info);
sp->file_list = nil;
}
tm = sp->control;
verify(tm, V_tcpmessage);
tm->command = TCP_CLOSE;
tm->header.mn_ReplyPort = sync;
PutMsg(tcp, &tm->header); /* send CLOSE */
sp->connected = false;
if (sp->cwd)
{
deallocate(sp->cwd, V_cstr);
sp->cwd = nil;
}
while (sp->infos)
free_info_header(sp->infos);
WaitPort(sync);
GetMsg(sync); /* wait for CLOSE to come back */
/* it shouldn't really fail ... not sure if we can do anything if it has */
state_change(sp, SS_DISCONNECTED);
return;
}
unsigned long read_file(site* sp, unsigned char* s, unsigned long* length)
/*
* read *length bytes from open file
* Inputs:
* sp : site pointer
* s : data buffer
* length : pointer to length to read, changed to length actually read
*
* Result:
* tcp error is returned, *length is modified to be actual length read
*/
{
tcpmessage* tm;
struct MsgPort* sync;
unsigned long signals, asigs, rsigs;
verify(sp, V_site);
truth(s != nil);
truth(length != nil);
tm = sp->cfile;
verify(tm, V_tcpmessage);
sync = sp->sync;
tm->command = TCP_READ;
tm->flags = 0;
tm->data = s;
tm->length = *length;
tm->header.mn_ReplyPort = sync;
asigs = sp->abort_signals | sp->disconnect_signals;
signals = asigs | (1 << sync->mp_SigBit);
PutMsg(tcp, &tm->header);
do
{
rsigs = Wait(signals);
if (rsigs & asigs)
{
state_change(sp, SS_ABORTING);
interrupt_message(sp, tm);
if (rsigs & sp->disconnect_signals)
{
disconnect(sp);
}
else
{
close_file(sp, false);
}
*length = 0;
return ERROR_INTERRUPTED;
}
}
while (!GetMsg(sync));
if (tm->result > 0)
{
*length = tm->result;
return NO_ERROR;
}
else
{
*length = 0;
return tm->error;
}
}
unsigned long write_file(site* sp, unsigned char* s, unsigned long* length)
/*
* write *length bytes to an open file (almost identical copy to read_file above)
* Inputs:
* sp : site pointer
* s : data buffer
* length : pointer to length to write, changed to length actually written
*
* Result:
* tcp error is returned, *length is modified to be actual length written
*/
{
tcpmessage* tm;
struct MsgPort* sync;
unsigned long signals, asigs, rsigs;
verify(sp, V_site);
truth(s != nil);
truth(length != nil);
tm = sp->cfile;
verify(tm, V_tcpmessage);
sync = sp->sync;
tm->command = TCP_WRITE;
tm->flags = 0;
tm->data = s;
tm->length = *length;
tm->header.mn_ReplyPort = sync;
asigs = sp->abort_signals | sp->disconnect_signals;
signals = asigs | (1 << sync->mp_SigBit);
PutMsg(tcp, &tm->header);
do
{
rsigs = Wait(signals);
if (rsigs & asigs)
{
state_change(sp, SS_ABORTING);
interrupt_message(sp, tm);
if (rsigs & sp->disconnect_signals)
{
disconnect(sp);
}
else
{
close_file(sp, false);
}
*length = 0;
return ERROR_INTERRUPTED;
}
}
while (!GetMsg(sync));
if (tm->result > 0)
{
*length = tm->result;
return NO_ERROR;
}
else
{
*length = 0;
return tm->error;
}
}
unsigned long open_file(site* sp, unsigned char* s, boolean writing, unsigned char* leaf_name)
/*
* open file with name in s
* Inputs:
* sp : site pointer
* s : file name
* writing : true if opened for writing, false if for reading
*
* Returns:
* 0 : no error
* non-0 : standard file system errors (ERROR_OBJECT_NOT_FOUND etc)
*/
{
tcpmessage *tm, *newtm;
struct MsgPort* sync;
unsigned char reply[4], *info;
unsigned char* leaf;
unsigned long error;
unsigned short port_number;
file_info* fi;
verify(sp, V_site);
truth(s != nil);
/* a few conditions we are assuming */
truth(sp->connected);
truth(sp->cfile == nil);
truth(sp->file_list == nil);
if (s[0] == 0)
{
/* they are trying to open the root of this site as a file ... */
return ERROR_OBJECT_WRONG_TYPE;
}
tm = sp->control;
verify(tm, V_tcpmessage);
sync = sp->sync;
tm->header.mn_ReplyPort = sync;
leaf = cd_parent(sp, s);
if (!leaf)
{
/* there are other possible reasons here, but I'm being lazy ... */
return ERROR_DIR_NOT_FOUND;
}
if (leaf_name)
leaf = leaf_name;
DS(kprintf("** open_file(\"%s\", %s) (site %s)\n", s, (writing ? "write" : "read"), sp->host))
state_change(sp, SS_OPENING);
newtm = new_message(sp);
if (newtm)
{
fi = (file_info *)allocate(sizeof(*fi) + strlen(s) + 1, V_file_info);
if (fi)
{
strcpy(fi->fname, s);
if (control_write(sp, "PASV\r\n", 0) == NO_ERROR)
{
if (writing)
{ /* yes, I do this twice :( */
sprintf(sp->read_buffer, "STOR %s\r\n", leaf);
}
else
{
sprintf(sp->read_buffer, "RETR %s\r\n", leaf);
}
if (!sp->quick || control_write(sp, sp->read_buffer, 0) == NO_ERROR)
{
if (response(sp, 0, &info, reply) == NO_ERROR)
{
if (reply[0] == '2')
{
if (info)
{
if (passive_response(info, sp->read_buffer, &port_number))
{
deallocate(info, V_cstr);
if (make_connection(sp, newtm, sp->read_buffer, port_number, 0) == NO_ERROR)
{
if (writing)
{ /* and again */
sprintf(sp->read_buffer, "STOR %s\r\n", leaf);
}
else
{
sprintf(sp->read_buffer, "RETR %s\r\n", leaf);
}
if (sp->quick || control_write(sp, sp->read_buffer, 0) == NO_ERROR)
{
/* this next response will be to the RETR/STOR */
if (response(sp, 0, &info, reply) == NO_ERROR)
{
if (info)
{
#ifdef VERIFY
if (reply[0] != '1')
{
reply[3] = 0;
show_string(reply);
show_string(info);
}
#endif
deallocate(info, V_cstr);
}
if (reply[0] == '1')
{
ensure(fi, V_file_info);
fi->rfarg = 0;
fi->rpos = 0;
fi->vpos = 0;
fi->end = 0;
fi->closed = false;
fi->seek_end = false;
fi->eof = false;
fi->port = nil;
fi->type = (writing) ? ACTION_FINDOUTPUT : ACTION_FINDINPUT;
sp->cfile = newtm;
sp->file_list = fi;
fi->next = nil;
return 0;