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Server.C
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Server.C
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//
// Server.C -- News server class
//
// Copyright 2003-2004 Michael Sweet
// Copyright 2002 Greg Ercolano
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public Licensse as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// 80 //////////////////////////////////////////////////////////////////////////
#include "Subs.H"
#include "Server.H"
#include <dirent.h>
// Convenience macros...
#define ISIT(x) if (!strcasecmp(cmd, x))
#define ISHEAD(a) (strncasecmp(head, (a), strlen(a))==0)
// LOCAL: Return ASCII only version of string 's', with binary encoded as hex <0x##>
// NOTE: in the following, "ASCII" is defined as per RFC 822 4.1.2.
// (This code nabbed from mailrecv V1.12)
//
static char *AsciiHexEncode(const char *s, int allow_crlf=0) {
// First pass: determine how large output string needs to be
int outlen = 0;
const char *ss = s;
while ( *ss ) {
if ( *ss >= 0x20 && *ss <= 0x7e ) // Printable ASCII? (RFC 822 4.1.2)
{ ++outlen; } // OK
else if ( allow_crlf && (*ss == '\r' || *ss == '\n') ) // CRLF allowed?
{ ++outlen; } // OK
else
{ outlen += 6; } // 6 chars for every one binary char
++ss;
}
++outlen; // leave room for terminating NULL
char *buf = (char*)malloc(outlen);
char *out = buf;
ss = s;
while ( *ss ) {
if ( *ss >= 0x20 && *ss <= 0x7e ) // Printable ASCII?
{ *out++ = *ss; } // OK
else if ( allow_crlf && (*ss == '\r' || *ss == '\n') ) // CRLF allowed?
{ *out++ = *ss; } // OK
else {
sprintf(out, "<0x%02x>", (unsigned char)*ss); // write hex code
out += 6; // move past hex code
}
++ss;
}
*out = 0;
return buf;
}
// SENDS CRLF TERMINATED MESSAGE TO REMOTE
int Server::Send(const char *msg)
{
string out = msg; out.append("\r\n");
write(msgsock, out.c_str(), out.length());
G_conf.LogMessage(L_DEBUG, "SEND: %.4000s", msg);
return(0);
}
// SEE IF GROUPNAME IS ON THIS SERVER
int Server::ValidGroup(const char *groupname)
{
// DISALLOW UNIX PATHNAME LOOPHOLES
if ( strstr(groupname, "..") )
{ errmsg = "illegal groupname"; return(-1); }
// CHECK FOR INVALID CHARS IN GROUPNAME
for ( int t=0; groupname[t]; t++ )
if ( ( groupname[t] >= 'a' && groupname[t] <= 'z' ) || // alphalower
( groupname[t] >= 'A' && groupname[t] <= 'Z' ) || // alphaupper
( groupname[t] >= '0' && groupname[t] <= '9' ) || // numeric
groupname[t] == '.' ) // dot
{ continue; }
else
{ errmsg = "illegal chars in groupname"; return(-1); }
string dirname;
dirname = G_conf.SpoolDir();
dirname.append("/");
dirname.append(groupname);
struct stat sbuf;
if ( stat(dirname.c_str(), &sbuf) == -1 )
{ errmsg = "group does not exist"; return(-1); }
return(0);
}
// FIND GROUP, UPDATE START/END/TOTAL INFO
int Server::NewGroup(const char *the_group)
{
if ( ValidGroup(the_group) < 0 )
{ return(-1); }
if ( group.LoadInfo(the_group) < 0 )
{ errmsg = group.Errmsg(); return(-1); }
return(0);
}
// BREAK A LONG LINE INTO SMALLER PIECES
// Useful for breaking eg. a big Bcc: list into separate lines.
//
void BreakLineToFP(FILE *fp,
const char *prefix, // prefix, eg. "Bcc: "
const char *line, // long line, eg. "a,b,c,d"
const char *trail, // trailing chars, eg. "\n"
const char *brk) // list of chars to break on
// eg. ","
{
string addr;
const char *ss = line;
for (; 1; ++ss )
{
// break character?
if ( *ss == 0 || strchr(brk, *ss) )
{
if ( addr != "" )
{ fprintf(fp, "%s%s%s", prefix, addr.c_str(), trail); }
addr = "";
if ( *ss == 0 ) return;
}
else
{ addr += *ss; }
}
}
void AllGroups(vector<string>& groupnames, const char *subdir)
{
DIR *dir;
struct dirent *dent;
struct stat fileinfo;
string dirname, filename, newsubdir;
char groupname[LINE_LEN];
dirname = G_conf.SpoolDir();
if (subdir)
dirname = dirname + "/" + subdir;
if ((dir = opendir(dirname.c_str())) != NULL)
{
while ((dent = readdir(dir)) != NULL)
{
// Skip dot files...
if (dent->d_name[0] == '.')
continue;
// See if the file is a directory...
filename = dirname + "/" + dent->d_name;
if (stat(filename.c_str(), &fileinfo)) continue;
if (!S_ISDIR(fileinfo.st_mode)) continue; // not a dir, skip
// It is a directory, see if it is a group...
int isgroup = 0;
filename += "/.config";
if (!stat(filename.c_str(), &fileinfo))
{
isgroup = 1; // it's a group
// Yes, add the group...
if (subdir)
{
// Use subdirectory for group name, map '/' -> '.'
snprintf(groupname, sizeof(groupname), "%s.%s",
subdir, dent->d_name);
ReplaceString_SUBS(groupname, '/', '.');
}
else
{
// TODO: add strlcpy() and emulation as needed...
strncpy(groupname, dent->d_name, sizeof(groupname) - 1);
groupname[sizeof(groupname) - 1] = '\0';
}
groupnames.push_back(groupname);
}
// Recurse into the subdirectory if it's /not/ a group
if (subdir)
newsubdir = string(subdir) + "/" + dent->d_name;
else
newsubdir = dent->d_name;
if ( G_conf.NoRecurseMsgDir() )
{
if ( !isgroup ) // optimization: avoid recursing into potentially huge group dir
AllGroups(groupnames, newsubdir.c_str());
}
else
{ AllGroups(groupnames, newsubdir.c_str()); }
}
closedir(dir);
}
}
// HANDLE SIGALRM
// alarm() used to timeout inactive child servers.
//
static void sigalrm_handler(int)
{
// cerr << "ALARM -- connection timed out. (child exiting)" << endl;
exit(1);
}
// SEE IF AN OPERATION IS ALLOWED TO BE DONE
// op can be:
// AUTH_READ -- allowed to read?
// AUTH_POST -- allowed to post?
// Returns: 1 if ok, 0 if not sends a proper error
//
int Server::IsAllowed(int op)
{
if ( ! G_conf.IsAuthAllowed(op) )
{
Send("480 Authentication required"); // RFC 2980 3.1.1
return(0);
}
return(1);
}
// HANDLE COMMANDS FROM REMOTE
int Server::CommandLoop(const char *overview[])
{
const char *remoteip_str = GetRemoteIPStr();
char s[LINE_LEN+1],
cmd[LINE_LEN+1],
arg1[LINE_LEN+1],
arg2[LINE_LEN+1],
reply[LINE_LEN];
int auth_simple = 0;
string auth_user_save;
string auth_pass_save;
Send("200 newsd news server ready - posting ok");
// HANDLE ALARM -- timeout the connection if no data transacted
signal(SIGALRM, sigalrm_handler);
while ( 1 )
{
int total = 0;
char *ss = s;
int found = 0;
// RESET TIMEOUT ALARM
if ( G_conf.Timeout() )
{ alarm(G_conf.Timeout()); }
// READ A CRLF-TERMINATED (OR LF-TERMINATED) LINE
for ( ; read(msgsock, ss, 1) == 1; ss++, total++ )
{
if ( *ss == '\n' || total >= (LINE_LEN-2) )
{ *ss = 0; found = 1; break; }
if ( *ss == '\r' )
{
read(msgsock, ss, 1); // skip \n
*ss = 0;
found = 1;
break;
}
}
if ( ! found )
{ break; }
string remhost = GetRemoteIPStr();
// LOG RECEIVED REMOTE COMMAND
{
if ( G_conf.ErrorLog_Hex() ) {
// Handle if we should log any binary content in hex
char *line_safe = AsciiHexEncode(s);
G_conf.LogMessage(L_INFO, "GOT: '%s' from %s", line_safe, remhost.c_str());
free(line_safe);
} else {
G_conf.LogMessage(L_INFO, "GOT: '%s' from %s", s, remhost.c_str());
}
}
arg1[0] = arg2[0] = 0;
if ( sscanf(s, "%s%s%s", cmd, arg1, arg2) < 1 )
{ continue; }
// AUTHINFO SIMPLE -- username/password
// This is a continuation of an 'AUTHINFO SIMPLE' command
// where we parse the user/password on an empty line.
//
if ( auth_simple )
{
auth_simple = 0;
// EXPECT 'user' AND 'pass'
if ( !cmd[0] || !arg1[0] )
{ Send("501 Bad or unknown argument"); continue; }
auth_user_save = cmd;
auth_pass_save = arg1;
if ( G_conf.AuthLogin(auth_user_save, auth_pass_save) < 0 )
Send("452 Authorization rejected"); // RFC 2980 3.1.2.1
else
Send("250 Authenticated OK"); // RFC 2980 3.1.2.1
auth_user_save = "";
auth_pass_save = "";
continue;
}
ISIT("AUTHINFO") // AUTHENTICATION -- RFC 2980 3.1
{
// "AUTHINFO SIMPLE"
if ( strcasecmp(arg1, "SIMPLE") == 0 ) // RFC 2980 3.1.2
{
if ( ! G_conf.IsAuthNeeded() )
{ Send("281 No authentication needed"); continue; }
Send("350 Go ahead with username and password"); // 3.1.2.1
auth_simple = 1;
continue;
}
else if ( strcasecmp(arg1, "USER") == 0 ) // RFC 2980 3.1.1
{
if ( ! G_conf.IsAuthNeeded() )
{ Send("281 No authentication needed"); continue; }
if ( ! arg2[0] )
{ Send("501 Bad or unknown argument"); continue; }
auth_user_save = arg2;
Send("381 Now supply your password"); // 3.1.1.1
continue;
}
else if ( strcasecmp(arg1, "PASS") == 0 ) // RFC 2980 3.1.1
{
if ( ! G_conf.IsAuthNeeded() )
{ Send("281 No authentication needed"); continue; }
if ( ! arg2[0] )
{ Send("501 Bad or unknown argument"); continue; }
if ( auth_user_save == "" )
{ Send("482 User must be specified first"); continue; }
auth_pass_save = arg2;
if ( G_conf.AuthLogin(auth_user_save, auth_pass_save) < 0 )
Send("482 Authentication failed"); // 3.1.1.1
else
Send("281 Authenticated OK"); // 3.1.1.1
auth_user_save = "";
auth_pass_save = "";
continue;
}
else if ( strcasecmp(arg1, "GENERIC") == 0 ) // RFC 2980 3.1.3
{
Send("501 'AUTHINFO GENERIC' not supported"); // 3.1.3.1
continue;
}
Send("501 Bad or unknown argument");
continue;
}
ISIT("CHECK") // TRANSPORT EXTENSION -- RFC 2980
{
Send("400 not accepting articles - we are not a news feed");
continue;
}
ISIT("TAKETHIS") // TRANSPORT EXTENSION -- RFC 2980
{
Send("400 not accepting articles - we are not a news feed");
continue;
}
ISIT("MODE") // TRANSPORT EXTENSION -- RFC 2980
{
if ( strcasecmp(arg1, "stream") == 0 )
{
Send("500 Streaming not implemented on this server");
continue;
}
// NEWS READER EXTENSION -- RFC 2980
if ( strcasecmp(arg1, "reader") == 0 )
{
Send("200 erco's newsd server ready (posting ok)");
continue;
}
Send("500 What?"); // inn/nnrp/commands.c:CMDmode() - erco
continue;
}
ISIT("LIST")
{
if ( ! IsAllowed(AUTH_READ) ) continue;
if ( strcasecmp(arg1, "EXTENSIONS") == 0 ) // INTERNET DRAFT (S.Barber)
{
Send("202 Extensions supported:\r\n"
"LISTGROUP\r\n"
"MODE\r\n"
"XREPLIC\r\n"
"XOVER\r\n"
"DATE\r\n"
".");
continue;
}
if ( strcasecmp(arg1, "ACTIVE") == 0 || // NEWS READER EXTENSION -- RFC 2980
arg1[0] == 0 ) // RFC 977
{
// "LIST ACTIVE rush.*"
if ( strcasecmp(cmd, "LIST") == 0 &&
strcasecmp(arg1, "ACTIVE") == 0 &&
arg2[0] != 0 )
{
Send("501 LIST ACTIVE <wildmat>: wildmats not supported"); // TBD
continue;
}
// "LIST" or "LIST ACTIVE"
Send("215 list of newsgroups follows");
vector<string> groupnames;
AllGroups(groupnames, NULL);
for ( unsigned t=0; t<groupnames.size(); t++ )
{
Group tgroup;
if ( tgroup.LoadInfo(groupnames[t].c_str()) < 0 )
{ continue; }
snprintf(reply, sizeof(reply), "%s %d %d %c",
(const char*)tgroup.Name(),
(int)tgroup.Total(),
(int)tgroup.Start(),
(char)(tgroup.PostOK() ? 'y' : 'n'));
Send(reply);
}
Send(".");
continue;
}
if ( strcasecmp(arg1, "ACTIVE.TIMES")==0 ) // NEWS READER EXTENSION -- RFC 2980
{
Send("215 information follows");
vector<string> groupnames;
AllGroups(groupnames, NULL);
for ( unsigned t=0; t<groupnames.size(); t++ )
{
Group tgroup;
if ( tgroup.LoadInfo(groupnames[t].c_str()) < 0 )
{ continue; }
snprintf(reply, sizeof(reply), "%s %ld %s",
(const char*)tgroup.Name(),
(long)tgroup.Ctime(),
(const char*)tgroup.Creator());
Send(reply);
}
Send(".");
continue;
}
if ( strcasecmp(arg1, "DISTRIBUTIONS")==0 ) // NEWS READER EXTENSION -- RFC 2980
{
// TODO
Send("503 Not implemented on this server");
continue;
}
if ( strcasecmp(arg1, "DISTRIB.PATS")==0 ) // NEWS READER EXTENSION -- RFC 2980
{
// TODO
Send("503 Not implemented on this server");
continue;
}
if ( strcasecmp(arg1, "NEWSGROUPS")==0 ) // NEWS READER EXTENSION -- RFC 2980
{
Send("215 information follows");
vector<string> groupnames;
AllGroups(groupnames, NULL);
for ( unsigned t=0; t<groupnames.size(); t++ )
{
Group tgroup;
if ( tgroup.LoadInfo(groupnames[t].c_str()) < 0 )
{ continue; }
snprintf(reply, sizeof(reply), "%s %s",
(const char*)tgroup.Name(),
(const char*)tgroup.Description());
Send(reply);
}
Send(".");
continue;
}
if ( strcasecmp(arg1, "OVERVIEW.FMT")==0 ) // NEWS READER EXTENSION -- RFC 2980
{
Send("215 information follows");
for ( int t=0; overview[t]; t++ )
{ Send(overview[t]); }
Send(".");
continue;
}
if ( strcasecmp(arg1, "SUBSCRIPTIONS")==0 ) // NEWS READER EXTENSION -- RFC 2980
{
Send("215 information follows");
Send("rush.general"); // HACK: TBD
Send(".");
continue;
}
Send("501 Syntax error");
continue;
}
ISIT("LISTGROUP") // TRANSPORT EXTENSION -- RFC 2980
{
if ( ! IsAllowed(AUTH_READ) ) continue;
Group restore = group;
if ( arg1[0] )
{
if ( group.LoadInfo(arg1) < 0 )
{
snprintf(reply, sizeof(reply), "411 No such newsgroup: %s",
(const char*)group.Errmsg());
Send(reply);
group = restore;
continue;
}
}
if ( arg1[0] == 0 && ! group.IsValid() )
{
Send("412 Not currently in newsgroup");
continue;
}
// RFC 2980: SET CURRENT ARTICLE TO FIRST
article.Load(group.Start());
Send("211 list of article numbers follow");
for ( ulong t = group.Start(); t <= group.End(); t++ )
{ snprintf(reply, sizeof(reply), "%lu", t); Send(reply); }
Send(".");
continue;
}
ISIT("XREPLIC") // TRANSPORT EXTENSION -- RFC 2980
{
Send("437 'xreplic' not implemented on this server");
continue;
}
ISIT("XOVER") // NEWS READER EXTENSION -- RFC 2980
{
// From RFC2970 for XOVER:
//
// Each line of output will be formatted with the article number,
// followed by each of the headers in the overview database or the
// article itself (when the data is not available in the overview
// database) for that article separated by a tab character. The
// sequence of fields must be in this order: subject, author, date,
// message-id, references, byte count, and line count. Other optional
// fields may follow line count. Other optional fields may follow line
// count. These fields are specified by examining the response to the
// LIST OVERVIEW.FMT command. Where no data exists, a null field must
// be provided (i.e. the output will have two tab characters adjacent to
// each other). Servers should not output fields for articles that have
// been removed since the XOVER database was created.
//
if ( ! IsAllowed(AUTH_READ) ) continue;
if ( ! group.IsValid() )
{
Send("412 Not in a newsgroup");
continue;
}
ulong sarticle = group.Start(),
earticle = group.End();
// HANDLE OPTIONAL RANGE
if ( arg1[0] )
{
if ( sscanf(arg1, "%lu-%lu", &sarticle, &earticle) == 2 )
{ }
else if ( sscanf(arg1, "%lu-", &sarticle) == 1 )
{ earticle = group.End(); }
else
{ earticle = sarticle; }
}
// SANITIZE ARTICLE NUMBERS
if ( sarticle < group.Start() ) { sarticle = group.Start(); }
if ( sarticle > group.End() ) { sarticle = group.End(); }
if ( earticle < group.Start() ) { earticle = group.Start(); }
if ( earticle > group.End() ) { earticle = group.End(); }
if ( sarticle > earticle ) { sarticle = earticle; }
Send("224 overview follows");
for ( ulong t=sarticle; t<=earticle; t++ )
{
// LOAD EACH ARTICLE
Article a;
if ( a.Load(group.Name(), t) < 0 )
{
// cerr << " DEBUG: ERROR: " << a.Errmsg() << endl;
continue;
}
string reply = a.Overview(overview);
Send(reply.c_str());
}
Send(".");
continue;
}
ISIT("GROUP") // RFC 977
{
if ( ! IsAllowed(AUTH_READ) ) continue;
if ( arg1[0] == 0 )
{
Send("501 syntax error; expected 'GROUP <group-name>'");
continue;
}
Group restore = group;
if ( group.LoadInfo(arg1) < 0 )
{
snprintf(reply, sizeof(reply), "411 No such newsgroup: %s",
(const char*)group.Errmsg());
Send(reply);
group = restore;
continue;
}
// UPDATE CURRENT ARTICLE
article.Load(group.Name(), group.Start());
// 211 n f l s group selected
// (n = estimated number of articles in group,
// f = first article number in the group,
// l = last article number in the group,
// s = name of the group.)
//
snprintf(reply, sizeof(reply), "211 %lu %lu %lu %s group selected",
(ulong)group.Total(),
(ulong)group.Start(),
(ulong)group.End(),
(const char*)group.Name());
Send(reply);
continue;
}
ISIT("HELP") // RFC 977
{
Send("100 help text follows");
Send("CHECK\r\n"
"TAKETHIS\r\n"
"MODE [stream|reader]\r\n"
"LIST [active|active.times|distributions|distrib.pats|"
"newsgroups|overview.fmt|subscriptions]\r\n"
"LISTGROUP [newsgroup]\r\n"
"XREPLIC\r\n"
"XOVER [msg#|msg#-|msg#-msg#]\r\n"
"GROUP newsgroup\r\n"
"HELP\r\n"
"NEWGROUPS [YY]yymmdd hhmmss [GMT|UTC] [distributions]\r\n"
"NEWNEWS\r\n"
"NEXT\r\n"
"HEAD [msg#|<msgid>]\r\n"
"BODY [msg#|<msgid>]\r\n"
"ARTICLE [msg#|<msgid>]\r\n"
"AUTHINFO [user|pass] <value>\r\n"
"AUTHINFO simple\r\n"
"STAT [msg#|<msgid>]\r\n"
"POST\r\n"
"DATE\r\n"
"QUIT\r\n"
".");
continue;
}
ISIT("NEWGROUPS") // RFC 977
{
if ( ! IsAllowed(AUTH_READ) ) continue;
// NEWGROUPS <YYMMDD> <HHMMSS> [GMT] [<distributions>]
if ( strlen(arg1) != 6 || strlen(arg2) != 6 )
{
Send("501 Bad or missing date/time arguments");
continue;
}
int year, mon, day, hour, min, sec;
if ( sscanf(arg1, "%2d%2d%2d", &year, &mon, &day) != 3 ||
sscanf(arg2, "%2d%2d%2d", &hour, &min, &sec) != 3 )
{
Send("501 Bad date/time argument");
continue;
}
// TBD
// 1) TRANSLATE YY -> YYYY
// 2) TRANSLATE TIMES INTO A time() VALUE
// 3) COMPARE TIME TO GROUP'S CTIME
//
vector<string> groupnames;
AllGroups(groupnames, NULL);
Send("231 list of new newsgroups follows");
for ( unsigned t=0; t<groupnames.size(); t++ )
{
Group tgroup;
if ( tgroup.LoadInfo(groupnames[t].c_str()) < 0 )
{ continue; }
Send(tgroup.Name());
}
Send("."); // for now, nothing matches
continue;
/**** TBD
if ( tgroup.Ctime() > checktime )
{ Send(tgroup.Name()); }
}
Send(".");
continue;
********/
}
ISIT("NEWNEWS") // RFC 977
{
Send("501 Command not implemented on server"); // TBD
continue;
}
ISIT("NEXT") // RFC 977
{
if ( ! IsAllowed(AUTH_READ) ) continue;
Article restore = article;
if ( ! group.IsValid() )
{ Send("412 no newsgroup selected"); continue; }
if ( ! article.IsValid() )
{ Send("420 no article has been selected"); continue; }
ulong next = article.Number() + 1;
if ( next < group.Start() || next > group.End() )
{ Send("421 no next article in this group"); continue; }
if ( article.Load(group.Name(), next) < 0 )
{
snprintf(reply, sizeof(reply),
"421 error retrieving article %lu: %s",
(ulong)next,
(const char*)article.Errmsg());
Send(reply);
article = restore;
continue;
}
snprintf(reply, sizeof(reply),
"223 %lu %s article retrieved - request text separately",
(ulong)next,
(const char*)article.MessageID());
Send(reply);
continue;
}
if ( strcasecmp(cmd, "HEAD") == 0 || // RFC 977
strcasecmp(cmd, "BODY") == 0 || // RFC 977
strcasecmp(cmd, "ARTICLE") == 0 || // RFC 977
strcasecmp(cmd, "STAT") == 0 ) // RFC 977
{
if ( ! IsAllowed(AUTH_READ) ) continue;
Article restore = article;
ulong the_article;
char restoreflag = 0;
if ( ! group.IsValid() )
{ Send("412 Not currently in newsgroup"); continue; }
if ( arg1[0] == '<' ) // "ARTICLE <[email protected]>"
{
if ( group.FindArticleByMessageID(arg1, the_article) < 0 )
{
Send("430 no such article found");
continue;
}
restoreflag = 1; // RFC 977: do not affect current article
}
else if ( isdigit(arg1[0]) ) // "HEAD 12"
{
if ( sscanf(arg1, "%lu", &the_article) != 1 )
{ Send("501 bad article number"); continue; }
restoreflag = 0; // RFC 977: affect current article if valid
}
else if ( arg1[0] == 0 ) // "HEAD"
{
the_article = article.Number();
restoreflag = 1;
}
else // all else is junk
{ Send("501 bad argument"); continue; }
// Range check
if ( the_article < group.Start() || the_article > group.End() )
{
snprintf(reply, sizeof(reply),
"423 no such article in group (range %lu-%lu)",
(ulong)group.Start(),
(ulong)group.End());
Send(reply);
continue;
}
if ( article.Load(group.Name(), the_article) < 0 )
{
snprintf(reply, sizeof(reply), "430 no such article: %s",
(const char*)article.Errmsg());
Send(reply);
continue;
}
// HANDLE VARIATIONS OF COMMAND
if ( strcasecmp(cmd, "ARTICLE") == 0 )
{
snprintf(reply, sizeof(reply),
"220 %lu %s article retrieved - head and body follow",
(ulong)the_article,
(const char*)article.MessageID());
Send(reply);
article.SendArticle(msgsock);
Send(".");
}
else if ( strcasecmp(cmd, "HEAD") == 0 )
{
snprintf(reply, sizeof(reply),
"221 %lu %s article retrieved - head follows",
(ulong)the_article,
(const char*)article.MessageID());
Send(reply);
article.SendHead(msgsock);
Send(".");
}
else if ( strcasecmp(cmd, "BODY") == 0 )
{
snprintf(reply, sizeof(reply),
"222 %lu %s article retrieved - body follows",
(ulong)the_article,
(const char*)article.MessageID());
Send(reply);
article.SendBody(msgsock);
Send(""); // emtpy line followed by..
Send("."); // ..a period.
}
else if ( strcasecmp(cmd, "STAT") == 0 )
{
snprintf(reply, sizeof(reply),
"223 %lu %s article retrieved - request text separately",
(ulong)the_article,
(const char*)article.MessageID());
Send(reply);
}
if ( restoreflag )
{ article = restore; }
continue;
}
ISIT("POST") // RFC 977
{
if ( ! IsAllowed(AUTH_POST) ) continue;
Send("340 Continue posting; Period on a line by itself to end");
// KEEP TRACK OF POSTING LENGTH
// If too long, stop loading posting.
//
int linechars = 0,
linecount = 0,
toolong = 0;
// COLLECT POSTING FROM CLIENT
enum Mode { MODE_NORMAL, // normal data
MODE_CRLF, // received "<CRLF>"
MODE_CRLF_DOT // received "<CRLF>."
};
Mode mode = MODE_NORMAL;
char c;
string msg;
while (read(msgsock, &c, 1) == 1 )
{
if ( c == '\r' ) continue; // ignore \r's
// State machine to undo dot-stuffing and handle end of msg
// (as per RFC 3977, 3.1.1)
//
if ( c == '\n' )
{
if ( mode == MODE_CRLF_DOT ) // "<CRLF>.<CRLF>"? end of msg
break;
else
mode = MODE_CRLF; // received "<CRLF>"
}
else if ( c=='.' && mode==MODE_CRLF ) // received "<CRLF>."?
{
mode = MODE_CRLF_DOT;
continue; // undo dot-stuffing by skipping "."
}
else mode = MODE_NORMAL;
// KEEP TRACK OF #LINES
// Lines longer than 80 chars count as multiple lines.
// If posting too long, stop accumulating message in ram,
// but keep reading until they've sent the terminating "."
//
++linechars;
if ( linechars > 80 || c == '\n' )
{ linechars = 0; linecount++; }
if ( group.PostLimit() > 0 && linecount > group.PostLimit() )
{ toolong = 1; continue; }
msg += c;
}
// POSTING TOO LONG? FAIL
if ( toolong )
{
snprintf(reply, sizeof(reply),
"411 Not Posted: article exceeds sanity line limit of %d.",
(int)group.PostLimit());
Send(reply);
continue;
}
// PARSE ARTICLE -- SEPARATE HEADER AND BODY
vector<string> header;
vector<string> body;
if ( group.ParseArticle(msg, header, body) < 0 )
{
snprintf(reply, sizeof(reply), "441 %s",
(const char*)group.Errmsg());
Send(reply);
continue;
}
// UPDATE 'Path:'
group.UpdatePath(header);
// POST ARTICLE
// Don't affect 'current group' or 'current article'.
//
Group tgroup;
if ( tgroup.Post(overview, header, body, remoteip_str) < 0 )
{
snprintf(reply, sizeof(reply), "441 %s",
(const char*)tgroup.Errmsg());
Send(reply);
continue;
}
Send("240 Article posted successfully.");
// CC MESSAGE TO MAIL ADDRESS?
if ( tgroup.IsCCPost() )
{
string from = "Anonymous",
subject = "-";