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lynx/WWW/Library/Implementation/HTFinger.c
Daniel Baumann 20df3659cf
Adding upstream version 2.9.2. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-21 08:10:34 +02:00

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/*
* $LynxId: HTFinger.c,v 1.31 2013/11/28 11:27:50 tom Exp $
*
* FINGER ACCESS HTFinger.c
* =============
* Authors:
* ARB Andrew Brooks
*
* History:
* 21 Apr 94 First version (ARB, from HTNews.c by TBL)
* 12 Mar 96 Made the URL and command buffering secure from
* stack modifications, beautified the HTLoadFinger()
* and response() functions, and added support for the
* following URL formats for sending a "", "/w",
* "username[@host]", or "/w username[@host]" command
* to the server:
* finger://host
* finger://host/
* finger://host/%2fw
* finger://host/%2fw%20username[@host]
* finger://host/w/username[@host]
* finger://host/username[@host]
* finger://host/username[@host]/w
* finger://username@host
* finger://username@host/
* finger://username@host/w
* 15 Mar 96 Added support for port 79 gtype 0 gopher URLs
* relayed from HTLoadGopher. - FM
*/
#include <HTUtils.h>
#ifndef DISABLE_FINGER
#include <HTAlert.h>
#include <HTML.h>
#include <HTParse.h>
#include <HTFormat.h>
#include <HTTCP.h>
#include <HTString.h>
#include <HTFinger.h>
#include <LYUtils.h>
#include <LYLeaks.h>
#define FINGER_PORT 79 /* See rfc742 */
#define BIG 1024 /* Bug */
#define PUTC(c) (*targetClass.put_character)(target, c)
#define PUTS(s) (*targetClass.put_string)(target, s)
#define START(e) (*targetClass.start_element)(target, e, 0, 0, -1, 0)
#define END(e) (*targetClass.end_element)(target, e, 0)
#define FREE_TARGET (*targetClass._free)(target)
#define NEXT_CHAR HTGetCharacter()
/* Module-wide variables
*/
static int finger_fd; /* Socket for FingerHost */
struct _HTStructured {
const HTStructuredClass *isa; /* For gopher streams */
/* ... */
};
static HTStructured *target; /* The output sink */
static HTStructuredClass targetClass; /* Copy of fn addresses */
/* Initialisation for this module
* ------------------------------
*/
static BOOL initialized = NO;
static BOOL initialize(void)
{
finger_fd = -1; /* Disconnected */
return YES;
}
/* Start anchor element
* --------------------
*/
static void start_anchor(const char *href)
{
BOOL present[HTML_A_ATTRIBUTES];
const char *value[HTML_A_ATTRIBUTES];
{
int i;
for (i = 0; i < HTML_A_ATTRIBUTES; i++)
present[i] = (BOOL) (i == HTML_A_HREF);
}
((const char **) value)[HTML_A_HREF] = href;
(*targetClass.start_element) (target, HTML_A, present,
(const char **) value, -1, 0);
}
/* Send Finger Command line to remote host & Check Response
* --------------------------------------------------------
*
* On entry,
* command points to the command to be sent, including CRLF, or is null
* pointer if no command to be sent.
* On exit,
* Negative status indicates transmission error, socket closed.
* Positive status is a Finger status.
*/
static int response(char *command,
char *sitename,
HTParentAnchor *anAnchor,
HTFormat format_out,
HTStream *sink)
{
int status;
int length = (int) strlen(command);
int ch, i;
char line[BIG], *l, *cmd = NULL;
char *p = line, *href = NULL;
if (length == 0)
return (-1);
/* Set up buffering.
*/
HTInitInput(finger_fd);
/* Send the command.
*/
CTRACE((tfp, "HTFinger command to be sent: %s", command));
status = (int) NETWRITE(finger_fd, (char *) command, (unsigned) length);
if (status < 0) {
CTRACE((tfp, "HTFinger: Unable to send command. Disconnecting.\n"));
NETCLOSE(finger_fd);
finger_fd = -1;
return status;
}
/* if bad status */
/* Make a hypertext object with an anchor list.
*/
target = HTML_new(anAnchor, format_out, sink);
targetClass = *target->isa; /* Copy routine entry points */
/* Create the results report.
*/
CTRACE((tfp, "HTFinger: Reading finger information\n"));
START(HTML_HTML);
PUTC('\n');
START(HTML_HEAD);
PUTC('\n');
START(HTML_TITLE);
PUTS("Finger server on ");
PUTS(sitename);
END(HTML_TITLE);
PUTC('\n');
END(HTML_HEAD);
PUTC('\n');
START(HTML_BODY);
PUTC('\n');
START(HTML_H1);
PUTS("Finger server on ");
START(HTML_EM);
PUTS(sitename);
END(HTML_EM);
PUTS(": ");
StrAllocCopy(cmd, command);
for (i = ((int) strlen(cmd) - 1); i >= 0; i--) {
if (cmd[i] == LF || cmd[i] == CR) {
cmd[i] = '\0';
} else {
break;
}
}
PUTS(cmd);
FREE(cmd);
END(HTML_H1);
PUTC('\n');
START(HTML_PRE);
while ((ch = NEXT_CHAR) != EOF) {
if (interrupted_in_htgetcharacter) {
CTRACE((tfp,
"HTFinger: Interrupted in HTGetCharacter, apparently.\n"));
_HTProgress(CONNECTION_INTERRUPTED);
goto end_html;
}
if (ch != LF) {
*p = (char) ch; /* Put character in line */
if (p < &line[BIG - 1]) {
p++;
}
} else {
*p = '\0'; /* Terminate line */
/*
* OK we now have a line.
* Load it as 'l' and parse it.
*/
p = l = line;
while (*l) {
if (StrNCmp(l, STR_NEWS_URL, LEN_NEWS_URL) &&
StrNCmp(l, "snews://", 8) &&
StrNCmp(l, "nntp://", 7) &&
StrNCmp(l, "snewspost:", 10) &&
StrNCmp(l, "snewsreply:", 11) &&
StrNCmp(l, "newspost:", 9) &&
StrNCmp(l, "newsreply:", 10) &&
StrNCmp(l, "ftp://", 6) &&
StrNCmp(l, "file:/", 6) &&
StrNCmp(l, "finger://", 9) &&
StrNCmp(l, "http://", 7) &&
StrNCmp(l, "https://", 8) &&
StrNCmp(l, "wais://", 7) &&
StrNCmp(l, STR_MAILTO_URL, LEN_MAILTO_URL) &&
StrNCmp(l, "cso://", 6) &&
StrNCmp(l, "gopher://", 9))
PUTC(*l++);
else {
StrAllocCopy(href, l);
start_anchor(strtok(href, " \r\n\t,>)\""));
while (*l && !StrChr(" \r\n\t,>)\"", *l))
PUTC(*l++);
END(HTML_A);
FREE(href);
}
}
PUTC('\n');
}
}
NETCLOSE(finger_fd);
finger_fd = -1;
end_html:
END(HTML_PRE);
PUTC('\n');
END(HTML_BODY);
PUTC('\n');
END(HTML_HTML);
PUTC('\n');
FREE_TARGET;
return (0);
}
/* Load by name HTLoadFinger
* ============
*/
int HTLoadFinger(const char *arg,
HTParentAnchor *anAnchor,
HTFormat format_out,
HTStream *stream)
{
static char empty[1];
char *username, *sitename; /* Fields extracted from URL */
char *slash, *at_sign; /* Fields extracted from URL */
char *command, *str, *param; /* Buffers */
int port; /* Port number from URL */
int status; /* tcp return */
int result = HT_LOADED;
BOOL IsGopherURL = FALSE;
const char *p1 = arg;
CTRACE((tfp, "HTFinger: Looking for %s\n", (arg ? arg : "NULL")));
if (!(arg && *arg)) {
HTAlert(COULD_NOT_LOAD_DATA);
return HT_NOT_LOADED; /* Ignore if no name */
}
if (!initialized)
initialized = initialize();
if (!initialized) {
HTAlert(gettext("Could not set up finger connection."));
return HT_NOT_LOADED; /* FAIL */
}
/* Set up the host and command fields.
*/
if (!strncasecomp(arg, "finger://", 9)) {
p1 = arg + 9; /* Skip "finger://" prefix */
} else if (!strncasecomp(arg, "gopher://", 9)) {
p1 = arg + 9; /* Skip "gopher://" prefix */
IsGopherURL = TRUE;
}
param = 0;
sitename = StrAllocCopy(param, p1);
if (param == 0) {
HTAlert(COULD_NOT_LOAD_DATA);
return HT_NOT_LOADED;
} else if ((slash = StrChr(sitename, '/')) != NULL) {
*slash++ = '\0';
HTUnEscape(slash);
if (IsGopherURL) {
if (*slash != '0') {
HTAlert(COULD_NOT_LOAD_DATA);
return HT_NOT_LOADED; /* FAIL */
}
*slash++ = '\0';
}
}
if ((at_sign = StrChr(sitename, '@')) != NULL) {
if (IsGopherURL) {
HTAlert(COULD_NOT_LOAD_DATA);
return HT_NOT_LOADED; /* FAIL */
} else {
*at_sign++ = '\0';
username = sitename;
sitename = at_sign;
HTUnEscape(username);
}
} else if (slash) {
username = slash;
} else {
username = empty;
}
if (*sitename == '\0') {
HTAlert(gettext("Could not load data (no sitename in finger URL)"));
result = HT_NOT_LOADED; /* Ignore if no name */
} else if (HTParsePort(sitename, &port) != NULL) {
if (port != 79) {
HTAlert(gettext("Invalid port number - will only use port 79!"));
result = HT_NOT_LOADED; /* Ignore if wrong port */
}
}
if (result == HT_LOADED) {
/* Load the string for making a connection/
*/
str = 0;
HTSprintf0(&str, "lose://%s/", sitename);
/* Load the command for the finger server.
*/
command = 0;
if (at_sign && slash) {
if (*slash == 'w' || *slash == 'W') {
HTSprintf0(&command, "/w %s%c%c", username, CR, LF);
} else {
HTSprintf0(&command, "%s%c%c", username, CR, LF);
}
} else if (at_sign) {
HTSprintf0(&command, "%s%c%c", username, CR, LF);
} else if (*username == '/') {
if ((slash = StrChr((username + 1), '/')) != NULL) {
*slash = ' ';
}
HTSprintf0(&command, "%s%c%c", username, CR, LF);
} else if ((*username == 'w' || *username == 'W') &&
*(username + 1) == '/') {
if (*username + 2 != '\0') {
*(username + 1) = ' ';
} else {
*(username + 1) = '\0';
}
HTSprintf0(&command, "/%s%c%c", username, CR, LF);
} else if ((*username == 'w' || *username == 'W') &&
*(username + 1) == '\0') {
HTSprintf0(&command, "/%s%c%c", username, CR, LF);
} else if ((slash = StrChr(username, '/')) != NULL) {
*slash++ = '\0';
if (*slash == 'w' || *slash == 'W') {
HTSprintf0(&command, "/w %s%c%c", username, CR, LF);
} else {
HTSprintf0(&command, "%s%c%c", username, CR, LF);
}
} else {
HTSprintf0(&command, "%s%c%c", username, CR, LF);
}
/* Now, let's get a stream setup up from the FingerHost:
* CONNECTING to finger host
*/
CTRACE((tfp, "HTFinger: doing HTDoConnect on '%s'\n", str));
status = HTDoConnect(str, "finger", FINGER_PORT, &finger_fd);
CTRACE((tfp, "HTFinger: Done DoConnect; status %d\n", status));
if (status == HT_INTERRUPTED) {
/* Interrupt cleanly */
CTRACE((tfp,
"HTFinger: Interrupted on connect; recovering cleanly.\n"));
HTProgress(CONNECTION_INTERRUPTED);
result = HT_NOT_LOADED;
} else if (status < 0) {
NETCLOSE(finger_fd);
finger_fd = -1;
CTRACE((tfp, "HTFinger: Unable to connect to finger host.\n"));
HTAlert(gettext("Could not access finger host."));
result = HT_NOT_LOADED; /* FAIL */
} else {
CTRACE((tfp, "HTFinger: Connected to finger host '%s'.\n", str));
/* Send the command, and process response if successful.
*/
if (response(command, sitename, anAnchor, format_out, stream) != 0) {
HTAlert(gettext("No response from finger server."));
result = HT_NOT_LOADED;
}
}
FREE(str);
FREE(command);
}
FREE(param);
return result;
}
#ifdef GLOBALDEF_IS_MACRO
#define _HTFINGER_C_1_INIT { "finger", HTLoadFinger, NULL }
GLOBALDEF(HTProtocol, HTFinger, _HTFINGER_C_1_INIT);
#else
GLOBALDEF HTProtocol HTFinger =
{"finger", HTLoadFinger, NULL};
#endif /* GLOBALDEF_IS_MACRO */
#endif /* not DISABLE_FINGER */
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