src/LYUpload.c


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/* Routines to upload files to the local filesystem */
/* Created by: Rick Mallett, Carleton University */
/* Report problems to rmallett@ccs.carleton.ca */
/* Modified 15-Dec-95 George Lindholm (lindholm@ucs.ubc.ca):
	Reread the upload menu page every time, in case the "upload" directory
	  has changed (make the current directory that for the upload process).
	Prompt for the upload file name if there is no "%s" in the command
	  string. Most protocols allow the user to specify the file name
	  from the client side.  Xmodem appears to be the only that can't
	  figure out the filename from the transfer data so it needs the
	  information from lynx (or an upload script which prompts for it).
	  On the other hand, zmodem aborts when you give it a filename on
	  the command line (great way of bypassing the nodotfile code :=( ).
*/

#include "HTUtils.h"
#include "tcp.h"
#include "HTParse.h"
#include "HTAlert.h"
#include "LYCurses.h"
#include "LYUtils.h"
#include "LYGlobalDefs.h"
#include "LYSignal.h"
#include "LYStrings.h"
#include "LYClean.h"
#include "LYGetFile.h"
#include "LYUpload.h"
#include "LYSystem.h"
#include "LYLocal.h"

#include "LYexit.h"
#include "LYLeaks.h"

#define FREE(x) if (x) {free(x); x = NULL;}

/*
 *  LYUpload uploads a file to a given location using a 
 *  specified upload method.
 */

/* it parses an incoming link that looks like
 *
 *  LYNXDIRED://UPLOAD=<#>/TO=<STRING>
 */

PUBLIC int LYUpload ARGS1(char *,line) 
{
    char *method, *directory, *dir;
    int method_number;
    int count;
    char tmpbuf[256];
    char buffer[256];
    lynx_html_item_type *upload_command=0;
    int c;
    char *cp;
    FILE *fp;
    char cmd[512];
#ifdef VMS
    extern BOOLEAN HadVMSInterrupt;
#endif /* VMS */

    /* use configured upload commands */

    if((directory = (char *)strstr(line, "TO=")) == NULL)
	goto failed;
    *(directory-1) = '\0';
    /* go past "Directory=" */
    directory+=3;

    if((method = (char *)strstr(line, "UPLOAD=")) == NULL)
	goto failed;
    /* go past "Method=" */
    method+=7;
    method_number = atoi(method);

    for(count=0, upload_command=uploaders; count < method_number;
	count++, upload_command = upload_command->next)
      ; /* null body */

    /* Parsed out the Method and the Location? */
    if(upload_command->command == NULL) {
	_statusline("ERROR! - upload command is misconfigured");
	sleep(AlertSecs);
	goto failed;
    }

    /* Care about the local name? */
    if (strstr(upload_command->command, "%s")) {
	/*
	 * Commands have the form "command %s [etc]"
	 * where %s is the filename.
	 */

	_statusline("Enter a filename: ");
retry:
	*tmpbuf = '\0';
	if(LYgetstr(tmpbuf, VISIBLE, sizeof(tmpbuf), NORECALL) < 0)
	    goto cancelled;

	if(*tmpbuf=='\0')
	    goto cancelled;

	if (strstr(tmpbuf,"../") != NULL) {
	    _statusline(
		    "Illegal redirection \"../\" found! Request ignored. ");
	    sleep(AlertSecs);
	    goto cancelled;
	} else if(strchr(tmpbuf,'/') != NULL) {
	    _statusline("Illegal character \"/\" found! Request ignored. ");
	    sleep(AlertSecs);
	    goto cancelled;
	} else if (tmpbuf[0] == '~') {
	    _statusline(
		"Illegal redirection using \"~\" found! Request ignored. ");
	    sleep(AlertSecs);
	    goto cancelled;
	}
	sprintf(buffer,"%s/%s",directory,tmpbuf);

	if (no_dotfiles || !show_dotfiles) {
	    if (*buffer == '.' ||
#ifdef VMS
		((cp = strrchr(buffer, ':')) && *(cp+1) == '.') ||
		((cp = strrchr(buffer, ']')) && *(cp+1) == '.') ||
#endif /* VMS */
		((cp = strrchr(buffer, '/')) && *(cp+1) == '.')) {
		_statusline(
		  "File name may not begin with dot. Enter a new filename: ");
		goto retry;
	    }
	}

	/* See if it already exists. */
	if((fp = fopen(buffer,"r")) != NULL) {
	    fclose(fp);

#ifdef VMS
	    _statusline("File exists. Create higher version? (y/n)");
#else
	    _statusline("File exists. Overwrite? (y/n)");
#endif /* VMS */
	    c = 0;
	    while(TOUPPER(c)!='Y' && TOUPPER(c)!='N' && c != 7 && c != 3)
		c = LYgetch();
#ifdef VMS
	    if(HadVMSInterrupt) {
		HadVMSInterrupt = FALSE;
		goto cancelled;
	    }
#endif /* VMS */

	    if(c == 7 || c == 3) { /* Control-G or Control-C */
		goto cancelled;
	    }

	    if(TOUPPER(c) == 'N') {
		_statusline("Enter a filename: ");
		goto retry;
	    }
	}

	/* see if we can write to it */

	if((fp = fopen(buffer,"w")) != NULL) {
	    fclose(fp);
	    remove(buffer);
	} else {
	    _statusline("Cannot write to file. Enter a new filename: ");
	    goto retry;
	}

#ifdef VMS
	sprintf(tmpbuf,upload_command->command,buffer);
#else
	cp = quote_pathname(buffer); /* to prevent spoofing of the shell */
	sprintf(tmpbuf,upload_command->command,cp);
	FREE(cp);
#endif /* VMS */
    } else {			/* No substitution, no changes */
	strcpy(tmpbuf, upload_command->command);
    }

    dir = quote_pathname(directory);
    sprintf(cmd, "cd %s ; %s", dir, tmpbuf);
    FREE(dir);
    stop_curses();
    if(TRACE)
	fprintf(stderr,"command: %s\n",cmd);
    system(cmd);
    fflush(stdout);
    start_curses();
    /* don't remove(file); */

    return 1;

failed:

    _statusline("Unable to upload file.");
    sleep(AlertSecs);
    return 0;

cancelled:

    _statusline("Cancelling.");
    sleep(InfoSecs);
    return 0;

}

/*
 * LYUpload_options writes out the current upload choices to a file
 * so that the user can select printers in the same way that
 * they select all other links 
 * upload links look like
 *  LYNXDIRED//UPLOAD=<#>/TO=<STRING>
 */

PUBLIC int LYUpload_options ARGS2 (char **,newfile, char *,directory)
{
    char upload_filename[256];
    static char tempfile[128];
    static BOOLEAN first = TRUE;
    FILE *fp0;
    lynx_html_item_type *cur_upload;
    int count;
    static char curloc[256];
    char *cp;

    if (first) {
        tempname(tempfile, NEW_FILE);
	first = FALSE;
#ifdef VMS
    } else {
        remove(tempfile);   /* Remove duplicates on VMS. */
#endif /* VMS */
    }

    if ((fp0 = fopen(tempfile,"w")) == NULL) {
	HTAlert(CANNOT_OPEN_TEMP);
	return(-1);
    }

#ifdef VMS
    strcpy(curloc, "/sys$login");
#else
    cp = directory;
    if (!strncmp(cp,"file://localhost",16))
        cp += 16;
    else if (!strncmp(cp,"file:",5))
        cp += 5;
    strcpy(curloc,cp);
    HTUnEscape(curloc);
    if (curloc[strlen(curloc)-1] == '/')
        curloc[strlen(curloc)-1] = '\0';
#endif /* VMS */

    /* make the file a URL now */
#if defined (VMS) || defined (DOSPATH)
    sprintf(upload_filename,"file://localhost/%s",tempfile);
#else
    sprintf(upload_filename,"file://localhost%s",tempfile);
#endif /* VMS */
    StrAllocCopy(*newfile, upload_filename);

    fprintf(fp0,"<head>\n<title>%s</title>\n</head>\n<body>\n",
    		UPLOAD_OPTIONS_TITLE);

    fprintf(fp0,"<h1>Upload Options (%s Version %s)</h1>\n",
    				     LYNX_NAME, LYNX_VERSION);

    fputs("You have the following upload choices.<br>\n", fp0);
    fputs("Please select one:<br>\n<pre>\n", fp0);

    if(uploaders != NULL) {

       for(count=0, cur_upload=uploaders; cur_upload != NULL; 
	   cur_upload = cur_upload->next, count++) {

	  fprintf(fp0, "   <a href=\"LYNXDIRED://UPLOAD=%d/TO=%s\">",
	  	       count,curloc);

	  fprintf(fp0, (cur_upload->name ? 
			cur_upload->name : "No Name Given"));
	  fprintf(fp0, "</a>\n");
	}
    } else {
	fprintf(fp0, "\n   \
No other upload methods have been defined yet.  You may define\n   \
an unlimited number of upload methods using the lynx.cfg file.\n");

    }
    fprintf(fp0, "</pre>\n</body>\n");
    fclose(fp0);

    LYforce_no_cache = TRUE;

    return(0);
}