#include "citadel_dirs.h"
#include "ctdl_module.h"
+
+extern long timezone;
+
+/****************** BEGIN UTILITY FUNCTIONS THAT COULD BE MOVED ELSEWHERE LATER **************/
+
+
+/*
+ * Tests whether the supplied string is a valid newsgroup name
+ * Returns true (nonzero) or false (0)
+ */
+int is_valid_newsgroup_name(char *name) {
+ char *ptr = name;
+ int has_a_letter = 0;
+
+ if (!ptr) return(0);
+ if (!strncasecmp(name, "ctdl.", 5)) return(0);
+
+ while (*ptr != 0) {
+
+ if (isalpha(ptr[0])) {
+ has_a_letter = 1;
+ }
+
+ if ( (isalnum(ptr[0]))
+ || (ptr[0] == '.')
+ || (ptr[0] == '+')
+ || (ptr[0] == '-')
+ ) {
+ ++ptr;
+ }
+ else {
+ return(0);
+ }
+ }
+ return(has_a_letter);
+}
+
+
+
+/*
+ * Convert a Citadel room name to a valid newsgroup name
+ */
+void room_to_newsgroup(char *target, char *source, size_t target_size) {
+
+ if (!target) return;
+ if (!source) return;
+
+ if (is_valid_newsgroup_name(source)) {
+ strncpy(target, source, target_size);
+ return;
+ }
+
+ strcpy(target, "ctdl.");
+ int len = 5;
+ char *ptr = source;
+ char ch;
+
+ while (ch=*ptr++, ch!=0) {
+ if (len >= target_size) return;
+ if ( (isalnum(ch))
+ || (ch == '.')
+ || (ch == '-')
+ ) {
+ target[len++] = ch;
+ target[len] = 0;
+ }
+ else {
+ target[len++] = '+' ;
+ sprintf(&target[len], "%02x", ch);
+ len += 2;
+ target[len] = 0;
+ }
+ }
+}
+
+
+/*
+ * Convert a newsgroup name to a Citadel room name.
+ * This function recognizes names converted with room_to_newsgroup() and restores them with full fidelity.
+ */
+void newsgroup_to_room(char *target, char *source, size_t target_size) {
+
+ if (!target) return;
+ if (!source) return;
+
+ if (strncasecmp(source, "ctdl.", 5)) { // not a converted room name; pass through as-is
+ strncpy(target, source, target_size);
+ return;
+ }
+
+ target[0] = 0;
+ int len = 0;
+ char *ptr = &source[5];
+ char ch;
+
+ while (ch=*ptr++, ch!=0) {
+ if (len >= target_size) return;
+ if (ch == '+') {
+ char hex[3];
+ long digit;
+ hex[0] = *ptr++;
+ hex[1] = *ptr++;
+ hex[2] = 0;
+ digit = strtol(hex, NULL, 16);
+ ch = (char)digit;
+ }
+ target[len++] = ch;
+ target[len] = 0;
+ }
+}
+
+
+/****************** END UTILITY FUNCTIONS THAT COULD BE MOVED ELSEWHERE LATER **************/
+
+
+
/*
* Here's where our NNTP session begins its happy day.
*/
}
+// FIXME move this to a header file
+struct nntp_msglist {
+ int num_msgs;
+ long *msgnums;
+};
+
+
+/*
+ * Utility function to fetch the current list of message numbers in a room
+ */
+struct nntp_msglist nntp_fetch_msglist(struct ctdlroom *qrbuf) {
+ struct nntp_msglist nm;
+ struct cdbdata *cdbfr;
+
+ cdbfr = cdb_fetch(CDB_MSGLISTS, &qrbuf->QRnumber, sizeof(long));
+ if (cdbfr != NULL) {
+ nm.msgnums = (long*)cdbfr->ptr;
+ cdbfr->ptr = NULL;
+ nm.num_msgs = cdbfr->len / sizeof(long);
+ cdbfr->len = 0;
+ cdb_free(cdbfr);
+ } else {
+ nm.num_msgs = 0;
+ nm.msgnums = NULL;
+ }
+ return(nm);
+}
+
+
+
+
+enum {
+ NNTP_LIST_ACTIVE,
+ NNTP_LIST_ACTIVE_TIMES,
+ NNTP_LIST_DISTRIB_PATS,
+ NNTP_LIST_HEADERS,
+ NNTP_LIST_NEWSGROUPS,
+ NNTP_LIST_OVERVIEW_FMT
+};
+
+
+/*
+ * Output a room name (newsgroup name) in formats required for LIST and NEWGROUPS command
+ */
+void output_roomname_in_list_format(struct ctdlroom *qrbuf, int which_format) {
+ char n_name[1024];
+ struct nntp_msglist nm;
+ long low_water_mark = 0;
+ long high_water_mark = 0;
+
+ room_to_newsgroup(n_name, qrbuf->QRname, sizeof n_name);
+ nm = nntp_fetch_msglist(qrbuf);
+ if ((nm.num_msgs > 0) && (nm.msgnums != NULL)) {
+ low_water_mark = nm.msgnums[0];
+ high_water_mark = nm.msgnums[nm.num_msgs - 1];
+ }
+
+ switch(which_format) {
+ case NNTP_LIST_ACTIVE:
+ // FIXME we have hardcoded "n" for "no posting allowed" -- fix when we add posting
+ cprintf("%s %ld %ld n\r\n", n_name, high_water_mark, low_water_mark);
+ break;
+ case NNTP_LIST_NEWSGROUPS:
+ cprintf("%s %s\r\n", n_name, qrbuf->QRname);
+ break;
+ }
+
+ if (nm.msgnums != NULL) {
+ free(nm.msgnums);
+ }
+}
+
+
+
+/*
+ * Called once per room by nntp_newgroups() to qualify and possibly output a single room
+ */
+void nntp_newgroups_backend(struct ctdlroom *qrbuf, void *data)
+{
+ int ra;
+ int view;
+ time_t thetime = *(time_t *)data;
+
+ CtdlRoomAccess(qrbuf, &CC->user, &ra, &view);
+
+ /*
+ * The "created after <date/time>" heuristics depend on the happy coincidence
+ * that for a very long time we have used a unix timestamp as the room record's
+ * generation number (QRgen). When this module is merged into the master
+ * source tree we should rename QRgen to QR_create_time or something like that.
+ */
+
+ if (ra & UA_KNOWN) {
+ if (qrbuf->QRgen >= thetime) {
+ output_roomname_in_list_format(qrbuf, NNTP_LIST_ACTIVE);
+ }
+ }
+}
+
+/*
+ * Implements the NEWGROUPS command
+ */
+void nntp_newgroups(const char *cmd) {
+ /*
+ * HACK: this works because the 5XX series error codes from citadel
+ * protocol will also be considered error codes by an NNTP client
+ */
+ if (CtdlAccessCheck(ac_logged_in_or_guest)) return;
+
+
+ char stringy_date[16];
+ char stringy_time[16];
+ char stringy_gmt[16];
+ struct tm tm;
+ time_t thetime;
+
+ extract_token(stringy_date, cmd, 1, ' ', sizeof stringy_date);
+ extract_token(stringy_time, cmd, 2, ' ', sizeof stringy_time);
+ extract_token(stringy_gmt, cmd, 3, ' ', sizeof stringy_gmt);
+
+ memset(&tm, 0, sizeof tm);
+ if (strlen(stringy_date) == 6) {
+ sscanf(stringy_date, "%2d%2d%2d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday);
+ tm.tm_year += 100;
+ }
+ else {
+ sscanf(stringy_date, "%4d%2d%2d", &tm.tm_year, &tm.tm_mon, &tm.tm_mday);
+ tm.tm_year -= 1900;
+ }
+ tm.tm_mon -= 1; // tm_mon is zero based (0=January)
+ tm.tm_isdst = (-1); // let the C library figure out whether DST is in effect
+ sscanf(stringy_time, "%2d%2d%2d", &tm.tm_hour, &tm.tm_min ,&tm.tm_sec);
+ thetime = mktime(&tm);
+ if (!strcasecmp(stringy_gmt, "GMT")) {
+ tzset();
+ thetime += timezone;
+ }
+
+
+ cprintf("231 list of new newsgroups follows\r\n");
+ CtdlGetUser(&CC->user, CC->curr_user);
+ CtdlForEachRoom(nntp_newgroups_backend, &thetime);
+ cprintf(".\r\n");
+}
+
/*
* Main command loop for NNTP server sessions.
nntp_authinfo(ChrPtr(Cmd));
}
+ else if (!strcasecmp(cmdname, "newgroups")) {
+ nntp_newgroups(ChrPtr(Cmd));
+ }
+
+ //else if (!strcasecmp(cmdname, "list")) {
+ //nntp_list(ChrPtr(Cmd));
+ //}
+
else {
cprintf("500 I'm afraid I can't do that.\r\n");
}
/*****************************************************************************/
-/* MODULE INITIALIZATION STUFF */
+/* MODULE INITIALIZATION STUFF */
/*****************************************************************************/
/* return our module name for the log */
return "nntp";
}
+
projects / citadel.git / blobdiff