Adding upstream version 2.9.0dev.12.upstream/2.9.0dev.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 443 insertions, 0 deletions

diff --git a/src/LYExtern.c b/src/LYExtern.c
new file mode 100644
index 0000000..d36ba0b
--- /dev/null
+++ b/src/LYExtern.c
@@ -0,0 +1,443 @@
+/*
+ * $LynxId: LYExtern.c,v 1.55 2018/02/15 01:53:07 tom Exp $
+ *
+ External application support.
+ This feature allows lynx to pass a given URL to an external program.
+ It was written for three reasons.
+ 1) To overcome the deficiency	of Lynx_386 not supporting ftp and news.
+    External programs can be used instead by passing the URL.
+
+ 2) To allow for background transfers in multitasking systems.
+    I use wget for http and ftp transfers via the external command.
+
+ 3) To allow for new URLs to be used through lynx.
+    URLs can be made up such as mymail: to spawn desired applications
+    via the external command.
+
+ See lynx.cfg for other info.
+*/
+
+#include <LYUtils.h>
+
+#ifdef USE_EXTERNALS
+
+#include <HTAlert.h>
+#include <LYGlobalDefs.h>
+#include <LYExtern.h>
+#include <LYLeaks.h>
+#include <LYCurses.h>
+#include <LYReadCFG.h>
+#include <LYStrings.h>
+
+#ifdef WIN_EX
+/* ASCII char -> HEX digit */
+#define ASC2HEXD(x) ((UCH(x) >= '0' && UCH(x) <= '9') ?               \
+		     (UCH(x) - '0') : (toupper(UCH(x)) - 'A' + 10))
+
+/* Decodes the forms %xy in a URL to the character the hexadecimal
+   code of which is xy. xy are hexadecimal digits from
+   [0123456789ABCDEF] (case-insensitive). If x or y are not hex-digits
+   or '%' is near '\0', the whole sequence is inserted literally. */
+
+static char *decode_string(char *s)
+{
+    char *save_s;
+    char *p = s;
+
+    save_s = s;
+    for (; *s; s++, p++) {
+	if (*s != '%')
+	    *p = *s;
+	else {
+	    /* Do nothing if at the end of the string. Or if the chars
+	       are not hex-digits. */
+	    if (!*(s + 1) || !*(s + 2)
+		|| !(isxdigit(UCH(*(s + 1))) && isxdigit(UCH(*(s + 2))))) {
+		*p = *s;
+		continue;
+	    }
+	    *p = (char) ((ASC2HEXD(*(s + 1)) << 4) + ASC2HEXD(*(s + 2)));
+	    s += 2;
+	}
+    }
+    *p = '\0';
+    return save_s;
+}
+#endif /* WIN_EX */
+
+#ifdef WIN_EX
+/*
+ *  Delete dangerous characters as local path.
+ *  We delete '<>|' and also '%"'.
+ *  '%' should be deleted because it's difficut to escape for all cases.
+ *  So we can't treat paths which include '%'.
+ *  '"' should be deleted because it's a obstacle to quote whole path.
+ */
+static void delete_danger_characters(char *src)
+{
+    char *dst;
+
+    for (dst = src; *src != '\0'; src++) {
+	if (StrChr("<>|%\"", *src) == NULL) {
+	    *dst = *src;
+	    dst++;
+	}
+    }
+    *dst = '\0';
+}
+
+static char *escapeParameter(CONST char *parameter)
+{
+    size_t i;
+    size_t last = strlen(parameter);
+    size_t n = 0;
+    size_t encoded = 0;
+    size_t escaped = 0;
+    char *result;
+    char *needs_encoded = "<>|";
+    char *needs_escaped = "%";
+    char *needs_escaped_NT = "%&^";
+
+    for (i = 0; i < last; ++i) {
+	if (StrChr(needs_encoded, parameter[i]) != NULL) {
+	    ++encoded;
+	}
+	if (system_is_NT) {
+	    if (StrChr(needs_escaped_NT, parameter[i]) != NULL) {
+		++escaped;
+	    }
+	} else if (StrChr(needs_escaped, parameter[i]) != NULL) {
+	    ++escaped;
+	}
+    }
+
+    result = (char *) malloc(last + encoded * 2 + escaped + 1);
+    if (result == NULL)
+	outofmem(__FILE__, "escapeParameter");
+
+    n = 0;
+    for (i = 0; i < last; i++) {
+	if (StrChr(needs_encoded, parameter[i]) != NULL) {
+	    sprintf(result + n, "%%%02X", (unsigned char) parameter[i]);
+	    n += 3;
+	    continue;
+	}
+	if (system_is_NT) {
+	    if (StrChr(needs_escaped_NT, parameter[i]) != NULL) {
+		result[n++] = '^';
+		result[n++] = parameter[i];
+		continue;
+	    }
+	} else if (StrChr(needs_escaped, parameter[i]) != NULL) {
+	    result[n++] = '%';	/* parameter[i] is '%' */
+	    result[n++] = parameter[i];
+	    continue;
+	}
+	result[n++] = parameter[i];
+    }
+    result[n] = '\0';
+
+    return result;
+}
+#endif /* WIN_EX */
+
+static void format(char **result,
+		   char *fmt,
+		   char *parm)
+{
+    *result = NULL;
+    HTAddParam(result, fmt, 1, parm);
+    HTEndParam(result, fmt, 1);
+}
+
+/*
+ * Format the given command into a buffer, returning the resulting string.
+ *
+ * It is too dangerous to leave any URL that may come along unquoted.  They
+ * often contain '&', ';', and '?' chars, and who knows what else may occur.
+ * Prevent spoofing of the shell.  Dunno how this needs to be modified for VMS
+ * or DOS.  - kw
+ */
+static char *format_command(char *command,
+			    char *param)
+{
+    char *cmdbuf = NULL;
+
+#if defined(WIN_EX)
+    char pram_string[LY_MAXPATH];
+    char *escaped = NULL;
+
+    if (strncasecomp("file://localhost/", param, 17) == 0) {
+	/* decode local path parameter for programs to be
+	   able to interpret - TH */
+	LYStrNCpy(pram_string, param, sizeof(pram_string) - 1);
+	decode_string(pram_string);
+	param = pram_string;
+    } else {
+	/* encode or escape URL parameter - TH */
+	escaped = escapeParameter(param);
+	param = escaped;
+    }
+
+    if (isMAILTO_URL(param)) {
+	format(&cmdbuf, command, param + 7);
+    } else if (strncasecomp("telnet://", param, 9) == 0) {
+	char host[sizeof(pram_string)];
+	int last_pos;
+
+	LYStrNCpy(host, param + 9, sizeof(host));
+	last_pos = (int) strlen(host) - 1;
+	if (last_pos > 1 && host[last_pos] == '/')
+	    host[last_pos] = '\0';
+
+	format(&cmdbuf, command, host);
+    } else if (strncasecomp("file://localhost/", param, 17) == 0) {
+	char e_buff[LY_MAXPATH], *p;
+
+	p = param + 17;
+	delete_danger_characters(p);
+	*e_buff = 0;
+	if (StrChr(p, ':') == NULL) {
+	    sprintf(e_buff, "%.3s/", windows_drive);
+	}
+	strncat(e_buff, p, sizeof(e_buff) - strlen(e_buff) - 1);
+	p = strrchr(e_buff, '.');
+	if (p) {
+	    trimPoundSelector(p);
+	}
+
+	/* Less ==> short filename with backslashes,
+	 * less ==> long filename with forward slashes, may be quoted
+	 */
+	if (ISUPPER(command[0])) {
+	    char *short_name = HTDOS_short_name(e_buff);
+
+	    p = quote_pathname(short_name);
+	    format(&cmdbuf, command, p);
+	    FREE(p);
+	} else {
+	    p = quote_pathname(e_buff);
+	    format(&cmdbuf, command, p);
+	    FREE(p);
+	}
+    } else {
+	format(&cmdbuf, command, param);
+    }
+    FREE(escaped);
+#else
+    format(&cmdbuf, command, param);
+#endif
+    return cmdbuf;
+}
+
+/*
+ * Find the EXTERNAL command which matches the given name 'param'.  If there is
+ * more than one possibility, make a popup menu of the matching commands and
+ * allow the user to select one.  Return the selected command.
+ */
+static char *lookup_external(char *param,
+			     int only_overriders)
+{
+    int pass, num_disabled, num_matched, num_choices, cur_choice;
+    size_t length = 0;
+    char *cmdbuf = NULL;
+    char **actions = 0;
+    char **choices = 0;
+    lynx_list_item_type *ptr = 0;
+
+    for (pass = 0; pass < 2; pass++) {
+	num_disabled = 0;
+	num_matched = 0;
+	num_choices = 0;
+	for (ptr = externals; ptr != 0; ptr = ptr->next) {
+
+	    if (match_item_by_name(ptr, param, only_overriders)) {
+		++num_matched;
+		CTRACE((tfp, "EXTERNAL: '%s' <==> '%s'\n", ptr->name, param));
+		if (no_externals && !ptr->always_enabled && !only_overriders) {
+		    ++num_disabled;
+		} else {
+		    if (pass == 0) {
+			length++;
+		    } else if (pass != 0) {
+			cmdbuf = format_command(ptr->command, param);
+			if (length > 1) {
+			    actions[num_choices] = cmdbuf;
+			    choices[num_choices] =
+				format_command(ptr->menu_name, param);
+			}
+		    }
+		    num_choices++;
+		}
+	    }
+	}
+	if (length > 1) {
+	    if (pass == 0) {
+		actions = typecallocn(char *, length + 1);
+		choices = typecallocn(char *, length + 1);
+
+		if (actions == 0 || choices == 0)
+		    outofmem(__FILE__, "lookup_external");
+	    } else {
+		actions[num_choices] = 0;
+		choices[num_choices] = 0;
+	    }
+	}
+    }
+
+    if (num_disabled != 0
+	&& num_disabled == num_matched) {
+	HTUserMsg(EXTERNALS_DISABLED);
+    } else if (num_choices > 1) {
+	int old_y, old_x;
+
+	LYGetYX(old_y, old_x);
+	cur_choice = LYhandlePopupList(-1,
+				       0,
+				       old_x,
+				       (STRING2PTR) choices,
+				       -1,
+				       -1,
+				       FALSE,
+				       TRUE);
+	wmove(LYwin, old_y, old_x);
+	CTRACE((tfp, "selected choice %d of %d\n", cur_choice, num_choices));
+	if (cur_choice < 0) {
+	    HTInfoMsg(CANCELLED);
+	    cmdbuf = 0;
+	}
+	for (pass = 0; choices[pass] != 0; pass++) {
+	    if (pass == cur_choice) {
+		cmdbuf = actions[pass];
+	    } else {
+		FREE(actions[pass]);
+	    }
+	    FREE(choices[pass]);
+	}
+    }
+
+    if (actions) {
+	for (pass = 0; actions[pass] != 0; ++pass) {
+	    if (actions[pass] != cmdbuf)
+		FREE(actions[pass]);
+	}
+	FREE(actions);
+    }
+
+    if (choices) {
+	for (pass = 0; choices[pass] != 0; ++pass) {
+	    FREE(choices[pass]);
+	}
+	FREE(choices);
+    }
+
+    return cmdbuf;
+}
+
+BOOL run_external(char *param,
+		  int only_overriders)
+{
+#ifdef WIN_EX
+    int status;
+#endif
+    int redraw_flag = TRUE;
+    char *cmdbuf = NULL;
+    BOOL found = FALSE;
+    int confirmed = TRUE;
+
+    if (externals == NULL)
+	return 0;
+
+#ifdef WIN_EX			/* 1998/01/26 (Mon) 09:16:13 */
+    if (param == NULL) {
+	HTInfoMsg(gettext("External command is null"));
+	return 0;
+    }
+#endif
+
+    cmdbuf = lookup_external(param, only_overriders);
+    if (non_empty(cmdbuf)) {
+#ifdef WIN_EX			/* 1997/10/17 (Fri) 14:07:50 */
+	int len;
+	char buff[LY_MAXPATH];
+
+	CTRACE((tfp, "Lynx EXTERNAL: '%s'\n", cmdbuf));
+#ifdef WIN_GUI			/* 1997/11/06 (Thu) 14:17:15 */
+	confirmed = MessageBox(GetForegroundWindow(), cmdbuf,
+			       "Lynx (EXTERNAL COMMAND EXEC)",
+			       MB_ICONQUESTION | MB_SETFOREGROUND | MB_OKCANCEL)
+	    != IDCANCEL;
+#else
+	confirmed = HTConfirm(LYElideString(cmdbuf, 40)) != NO;
+#endif
+	if (confirmed) {
+	    len = (int) strlen(cmdbuf);
+	    if (len > 255) {
+		sprintf(buff, "Lynx: command line too long (%d > 255)", len);
+#ifdef WIN_GUI			/* 1997/11/06 (Thu) 14:17:02 */
+		MessageBox(GetForegroundWindow(), buff,
+			   "Lynx (EXTERNAL COMMAND EXEC)",
+			   MB_ICONEXCLAMATION | MB_SETFOREGROUND | MB_OK);
+		SetConsoleTitle("Lynx for Win32");
+#else
+		HTConfirm(LYElideString(buff, 40));
+#endif
+		confirmed = FALSE;
+	    } else {
+		SetConsoleTitle(cmdbuf);
+	    }
+	}
+
+	if (strncasecomp(cmdbuf, "start ", 6) == 0)
+	    redraw_flag = FALSE;
+	else
+	    redraw_flag = TRUE;
+#else
+	HTUserMsg(cmdbuf);
+#endif
+	found = TRUE;
+	if (confirmed) {
+	    if (redraw_flag) {
+		stop_curses();
+		fflush(stdout);
+	    }
+
+	    /* command running. */
+#ifdef WIN_EX			/* 1997/10/17 (Fri) 14:07:50 */
+#if defined(__CYGWIN__) || defined(__MINGW32__)
+	    status = system(cmdbuf);
+#else
+	    status = xsystem(cmdbuf);
+#endif
+	    if (status != 0) {
+		sprintf(buff,
+			"EXEC code = %04x (%2d, %2d)\r\n"
+			"'%s'",
+			status, (status / 256), (status & 0xff),
+			cmdbuf);
+#ifdef SH_EX			/* WIN_GUI for ERROR only */
+		MessageBox(GetForegroundWindow(), buff,
+			   "Lynx (EXTERNAL COMMAND EXEC)",
+			   MB_ICONSTOP | MB_SETFOREGROUND | MB_OK);
+#else
+		HTConfirm(LYElideString(buff, 40));
+#endif /* 1 */
+	    }
+#else /* Not WIN_EX */
+	    LYSystem(cmdbuf);
+#endif /* WIN_EX */
+
+#if defined(WIN_EX)
+	    SetConsoleTitle("Lynx for Win32");
+#endif
+	    if (redraw_flag) {
+		fflush(stdout);
+		start_curses();
+	    }
+	}
+    }
+
+    FREE(cmdbuf);
+    return found;
+}
+#endif /* USE_EXTERNALS */