ref: bf645afaac246967b9590ae7463f243c11d97480
dir: /sys/src/cmd/upas/imap4d/imap4d.c/
#include "imap4d.h"
/*
* these should be in libraries
*/
char *csquery(char *attr, char *val, char *rattr);
/*
* implemented:
* /lib/rfc/rfc3501 imap4rev1
* /lib/rfc/rfc2683 implementation advice
* /lib/rfc/rfc2342 namespace capability
* /lib/rfc/rfc2222 security protocols
* /lib/rfc/rfc1731 security protocols
* /lib/rfc/rfc2177 idle capability
* /lib/rfc/rfc2195 cram-md5 authentication
* /lib/rfc/rfc4315 uidplus capability
*
* not implemented, priority:
* /lib/rfc/rfc5256 sort and thread
* requires missing support from upas/fs.
*
* not implemented, low priority:
* /lib/rfc/rfc2088 literal+ capability
* /lib/rfc/rfc2221 login-referrals
* /lib/rfc/rfc2193 mailbox-referrals
* /lib/rfc/rfc1760 s/key authentication
*
*/
typedef struct Parsecmd Parsecmd;
struct Parsecmd
{
char *name;
void (*f)(char*, char*);
};
static void appendcmd(char*, char*);
static void authenticatecmd(char*, char*);
static void capabilitycmd(char*, char*);
static void closecmd(char*, char*);
static void copycmd(char*, char*);
static void createcmd(char*, char*);
static void deletecmd(char*, char*);
static void expungecmd(char*, char*);
static void fetchcmd(char*, char*);
static void getquotacmd(char*, char*);
static void getquotarootcmd(char*, char*);
static void idlecmd(char*, char*);
static void listcmd(char*, char*);
static void logincmd(char*, char*);
static void logoutcmd(char*, char*);
static void namespacecmd(char*, char*);
static void noopcmd(char*, char*);
static void renamecmd(char*, char*);
static void searchcmd(char*, char*);
static void selectcmd(char*, char*);
static void setquotacmd(char*, char*);
static void statuscmd(char*, char*);
static void storecmd(char*, char*);
static void subscribecmd(char*, char*);
static void uidcmd(char*, char*);
static void unsubscribecmd(char*, char*);
static void xdebugcmd(char*, char*);
static void copyucmd(char*, char*, int);
static void fetchucmd(char*, char*, int);
static void searchucmd(char*, char*, int);
static void storeucmd(char*, char*, int);
static void imap4(int);
static void status(int expungeable, int uids);
static void cleaner(void);
static void check(void);
static int catcher(void*, char*);
static Search *searchkey(int first);
static Search *searchkeys(int first, Search *tail);
static char *astring(void);
static char *atomstring(char *disallowed, char *initial);
static char *atom(void);
static void clearcmd(void);
static char *command(void);
static void crnl(void);
static Fetch *fetchatt(char *s, Fetch *f);
static Fetch *fetchwhat(void);
static int flaglist(void);
static int flags(void);
static int getc(void);
static char *listmbox(void);
static char *literal(void);
static uint litlen(void);
static Msgset *msgset(int);
static void mustbe(int c);
static uint number(int nonzero);
static int peekc(void);
static char *quoted(void);
static void secttext(Fetch *, int);
static uint seqno(void);
static Store *storewhat(void);
static char *tag(void);
static uint uidno(void);
static void ungetc(void);
static Parsecmd Snonauthed[] =
{
{"capability", capabilitycmd},
{"logout", logoutcmd},
{"noop", noopcmd},
{"x-exit", logoutcmd},
{"authenticate", authenticatecmd},
{"login", logincmd},
nil
};
static Parsecmd Sauthed[] =
{
{"capability", capabilitycmd},
{"logout", logoutcmd},
{"noop", noopcmd},
{"x-exit", logoutcmd},
{"xdebug", xdebugcmd},
{"append", appendcmd},
{"create", createcmd},
{"delete", deletecmd},
{"examine", selectcmd},
{"select", selectcmd},
{"idle", idlecmd},
{"list", listcmd},
{"lsub", listcmd},
{"namespace", namespacecmd},
{"rename", renamecmd},
{"setquota", setquotacmd},
{"getquota", getquotacmd},
{"getquotaroot", getquotarootcmd},
{"status", statuscmd},
{"subscribe", subscribecmd},
{"unsubscribe", unsubscribecmd},
nil
};
static Parsecmd Sselected[] =
{
{"capability", capabilitycmd},
{"xdebug", xdebugcmd},
{"logout", logoutcmd},
{"x-exit", logoutcmd},
{"noop", noopcmd},
{"append", appendcmd},
{"create", createcmd},
{"delete", deletecmd},
{"examine", selectcmd},
{"select", selectcmd},
{"idle", idlecmd},
{"list", listcmd},
{"lsub", listcmd},
{"namespace", namespacecmd},
{"rename", renamecmd},
{"status", statuscmd},
{"subscribe", subscribecmd},
{"unsubscribe", unsubscribecmd},
{"check", noopcmd},
{"close", closecmd},
{"copy", copycmd},
{"expunge", expungecmd},
{"fetch", fetchcmd},
{"search", searchcmd},
{"store", storecmd},
{"uid", uidcmd},
nil
};
static char *atomstop = "(){%*\"\\";
static Parsecmd *imapstate;
static jmp_buf parsejmp;
static char *parsemsg;
static int allowpass;
static int allowcr;
static int exiting;
static QLock imaplock;
static int idlepid = -1;
Biobuf bout;
Biobuf bin;
char username[Userlen];
char mboxdir[Pathlen];
char *servername;
char *site;
char *remote;
char *binupas;
Box *selected;
Bin *parsebin;
int debug;
Uidplus *uidlist;
Uidplus **uidtl;
void
usage(void)
{
fprint(2, "usage: upas/imap4d [-acpv] [-l logfile] [-b binupas] [-d site] [-r remotehost] [-s servername]\n");
bye("usage");
}
void
main(int argc, char *argv[])
{
int preauth;
Binit(&bin, dup(0, -1), OREAD);
close(0);
Binit(&bout, 1, OWRITE);
tmfmtinstall();
quotefmtinstall();
fmtinstall('F', Ffmt);
fmtinstall('D', Dfmt); /* rfc822; # imap date %Z */
fmtinstall(L'δ', Dfmt); /* rfc822; # imap date %s */
fmtinstall('X', Xfmt);
fmtinstall('Y', Zfmt);
fmtinstall('Z', Zfmt);
/* for auth */
fmtinstall('H', encodefmt);
fmtinstall('[', encodefmt);
preauth = 0;
allowpass = 0;
allowcr = 0;
ARGBEGIN{
case 'a':
preauth = 1;
break;
case 'b':
binupas = EARGF(usage());
break;
case 'c':
allowcr = 1;
break;
case 'd':
site = EARGF(usage());
break;
case 'l':
snprint(logfile, sizeof logfile, "%s", EARGF(usage()));
break;
case 'p':
allowpass = 1;
break;
case 'r':
remote = EARGF(usage());
break;
case 's':
servername = EARGF(usage());
break;
case 'v':
debug ^= 1;
break;
default:
usage();
break;
}ARGEND
if(allowpass && allowcr){
fprint(2, "imap4d: -c and -p are mutually exclusive\n");
usage();
}
if(preauth)
setupuser(nil);
if(servername == nil){
servername = csquery("sys", sysname(), "dom");
if(servername == nil)
servername = sysname();
if(servername == nil){
fprint(2, "ip/imap4d can't find server name: %r\n");
bye("can't find system name");
}
}
if(site == nil)
site = getenv("site");
if(site == nil){
site = strchr(servername, '.');
if(site)
site++;
else
site = servername;
}
rfork(RFNOTEG|RFREND);
atnotify(catcher, 1);
qlock(&imaplock);
atexit(cleaner);
imap4(preauth);
}
static void
imap4(int preauth)
{
char *volatile tg;
char *volatile cmd;
Parsecmd *st;
if(preauth){
Bprint(&bout, "* preauth %s IMAP4rev1 server ready user %s authenticated\r\n", servername, username);
imapstate = Sauthed;
}else{
Bprint(&bout, "* OK %s IMAP4rev1 server ready\r\n", servername);
imapstate = Snonauthed;
}
if(Bflush(&bout) < 0)
writeerr();
tg = nil;
cmd = nil;
if(setjmp(parsejmp)){
if(tg == nil)
Bprint(&bout, "* bad empty command line: %s\r\n", parsemsg);
else if(cmd == nil)
Bprint(&bout, "%s BAD no command: %s\r\n", tg, parsemsg);
else
Bprint(&bout, "%s BAD %s %s\r\n", tg, cmd, parsemsg);
clearcmd();
if(Bflush(&bout) < 0)
writeerr();
binfree(&parsebin);
}
for(;;){
if(mblocked())
bye("internal error: mailbox lock held");
tg = nil;
cmd = nil;
tg = tag();
mustbe(' ');
cmd = atom();
/*
* note: outlook express is broken: it requires echoing the
* command as part of matching response
*/
for(st = imapstate; st->name != nil; st++)
if(cistrcmp(cmd, st->name) == 0){
st->f(tg, cmd);
break;
}
if(st->name == nil){
clearcmd();
Bprint(&bout, "%s BAD %s illegal command\r\n", tg, cmd);
}
if(Bflush(&bout) < 0)
writeerr();
binfree(&parsebin);
}
}
void
bye(char *fmt, ...)
{
va_list arg;
va_start(arg, fmt);
Bprint(&bout, "* bye ");
Bvprint(&bout, fmt, arg);
Bprint(&bout, "\r\n");
Bflush(&bout);
exits(0);
}
void
parseerr(char *msg)
{
debuglog("parse error: %s", msg);
parsemsg = msg;
longjmp(parsejmp, 1);
}
/*
* an error occured while writing to the client
*/
void
writeerr(void)
{
cleaner();
_exits("connection closed");
}
static int
catcher(void *, char *msg)
{
if(strstr(msg, "closed pipe") != nil)
return 1;
return 0;
}
/*
* wipes out the idlecmd backgroung process if it is around.
* this can only be called if the current proc has qlocked imaplock.
* it must be the last piece of imap4d code executed.
*/
static void
cleaner(void)
{
int i;
debuglog("cleaner");
if(idlepid < 0)
return;
exiting = 1;
close(0);
close(1);
close(2);
close(bin.fid);
bin.fid = -1;
/*
* the other proc is either stuck in a read, a sleep,
* or is trying to lock imap4lock.
* get him out of it so he can exit cleanly
*/
qunlock(&imaplock);
for(i = 0; i < 4; i++)
postnote(PNGROUP, getpid(), "die");
}
/*
* send any pending status updates to the client
* careful: shouldn't exit, because called by idle polling proc
*
* can't always send pending info
* in particular, can't send expunge info
* in response to a fetch, store, or search command.
*
* rfc2060 5.2: server must send mailbox size updates
* rfc2060 5.2: server may send flag updates
* rfc2060 5.5: servers prohibited from sending expunge while fetch, store, search in progress
* rfc2060 7: in selected state, server checks mailbox for new messages as part of every command
* sends untagged EXISTS and RECENT respsonses reflecting new size of the mailbox
* should also send appropriate untagged FETCH and EXPUNGE messages if another agent
* changes the state of any message flags or expunges any messages
* rfc2060 7.4.1 expunge server response must not be sent when no command is in progress,
* nor while responding to a fetch, stort, or search command (uid versions are ok)
* command only "in progress" after entirely parsed.
*
* strategy for third party deletion of messages or of a mailbox
*
* deletion of a selected mailbox => act like all message are expunged
* not strictly allowed by rfc2180, but close to method 3.2.
*
* renaming same as deletion
*
* copy
* reject iff a deleted message is in the request
*
* search, store, fetch operations on expunged messages
* ignore the expunged messages
* return tagged no if referenced
*/
static void
status(int expungeable, int uids)
{
int tell;
if(!selected)
return;
tell = 0;
if(expungeable)
tell = expungemsgs(selected, 1);
if(selected->sendflags)
sendflags(selected, uids);
if(tell || selected->toldmax != selected->max){
Bprint(&bout, "* %ud EXISTS\r\n", selected->max);
selected->toldmax = selected->max;
}
if(tell || selected->toldrecent != selected->recent){
Bprint(&bout, "* %ud RECENT\r\n", selected->recent);
selected->toldrecent = selected->recent;
}
if(tell)
closeimp(selected, checkbox(selected, 1));
}
/*
* careful: can't exit, because called by idle polling proc
*/
static void
check(void)
{
if(!selected)
return;
checkbox(selected, 0);
status(1, 0);
}
static void
appendcmd(char *tg, char *cmd)
{
char *mbox, head[128];
uint t, n, now;
int flags, ok;
Tzone *tz;
Tm tm;
Uidplus u;
mustbe(' ');
mbox = astring();
mustbe(' ');
flags = 0;
if(peekc() == '('){
flags = flaglist();
mustbe(' ');
}
now = time(nil);
if(peekc() == '"'){
t = imap4datetime(quoted());
if(t == ~0)
parseerr("illegal date format");
mustbe(' ');
if(t > now)
t = now;
}else
t = now;
n = litlen();
mbox = mboxname(mbox);
if(mbox == nil){
check();
Bprint(&bout, "%s NO %s bad mailbox\r\n", tg, cmd);
return;
}
/* bug. this is upas/fs's job */
if(!cdexists(mboxdir, mbox)){
check();
Bprint(&bout, "%s NO [TRYCREATE] %s mailbox does not exist\r\n", tg, cmd);
return;
}
tz = tzload("local");
tmtime(&tm, t, tz);
snprint(head, sizeof head, "From %s %τ", username, tmfmt(&tm, "WW MMM _D hh:mm:ss Z YYYY"));
ok = appendsave(mbox, flags, head, &bin, n, &u);
crnl();
check();
if(ok)
Bprint(&bout, "%s OK [APPENDUID %ud %ud] %s completed\r\n",
tg, u.uidvalidity, u.uid, cmd);
else
Bprint(&bout, "%s NO %s message save failed\r\n", tg, cmd);
}
static void
authenticatecmd(char *tg, char *cmd)
{
char *s, *t;
mustbe(' ');
s = atom();
if(cistrcmp(s, "cram-md5") == 0){
crnl();
t = cramauth();
if(t == nil){
Bprint(&bout, "%s OK %s\r\n", tg, cmd);
imapstate = Sauthed;
}else
Bprint(&bout, "%s NO %s failed %s\r\n", tg, cmd, t);
}else if(cistrcmp(s, "plain") == 0){
s = nil;
if(peekc() == ' '){
mustbe(' ');
s = astring();
}
crnl();
if(!allowpass)
Bprint(&bout, "%s NO %s plaintext passwords disallowed\r\n", tg, cmd);
else if(t = plainauth(s))
Bprint(&bout, "%s NO %s failed %s\r\n", tg, cmd, t);
else{
Bprint(&bout, "%s OK %s\r\n", tg, cmd);
imapstate = Sauthed;
}
}else
Bprint(&bout, "%s NO %s unsupported authentication protocol\r\n", tg, cmd);
}
static void
capabilitycmd(char *tg, char *cmd)
{
crnl();
check();
Bprint(&bout, "* CAPABILITY IMAP4REV1 IDLE NAMESPACE QUOTA XDEBUG");
Bprint(&bout, " UIDPLUS");
if(allowpass || allowcr)
Bprint(&bout, " AUTH=CRAM-MD5 AUTH=PLAIN");
else
Bprint(&bout, " LOGINDISABLED AUTH=CRAM-MD5");
Bprint(&bout, "\r\n%s OK %s\r\n", tg, cmd);
}
static void
closecmd(char *tg, char *cmd)
{
crnl();
imapstate = Sauthed;
closebox(selected, 1);
selected = nil;
Bprint(&bout, "%s OK %s mailbox closed, now in authenticated state\r\n", tg, cmd);
}
/*
* note: message id's are before any pending expunges
*/
static void
copycmd(char *tg, char *cmd)
{
copyucmd(tg, cmd, 0);
}
static char *uidpsep;
static int
printuid(Box*, Msg *m, int, void*)
{
Bprint(&bout, "%s%ud", uidpsep, m->uid);
uidpsep = ",";
return 1;
}
static void
copyucmd(char *tg, char *cmd, int uids)
{
char *uid, *mbox;
int ok;
uint max;
Msgset *ms;
Uidplus *u;
mustbe(' ');
ms = msgset(uids);
mustbe(' ');
mbox = astring();
crnl();
uid = "";
if(uids)
uid = "UID ";
mbox = mboxname(mbox);
if(mbox == nil){
status(1, uids);
Bprint(&bout, "%s NO %s%s bad mailbox\r\n", tg, uid, cmd);
return;
}
if(!cdexists(mboxdir, mbox)){
check();
Bprint(&bout, "%s NO [TRYCREATE] %s mailbox does not exist\r\n", tg, cmd);
return;
}
uidlist = 0;
uidtl = &uidlist;
max = selected->max;
checkbox(selected, 0);
ok = formsgs(selected, ms, max, uids, copycheck, nil);
if(ok)
ok = formsgs(selected, ms, max, uids, copysaveu, mbox);
status(1, uids);
if(ok && uidlist){
u = uidlist;
Bprint(&bout, "%s OK [COPYUID %ud", tg, u->uidvalidity);
uidpsep = " ";
formsgs(selected, ms, max, uids, printuid, mbox);
Bprint(&bout, " %ud", u->uid);
for(u = u->next; u; u = u->next)
Bprint(&bout, ",%ud", u->uid);
Bprint(&bout, "] %s%s completed\r\n", uid, cmd);
}else if(ok)
Bprint(&bout, "%s OK %s%s completed\r\n", tg, uid, cmd);
else
Bprint(&bout, "%s NO %s%s failed\r\n", tg, uid, cmd);
}
static void
createcmd(char *tg, char *cmd)
{
char *mbox;
mustbe(' ');
mbox = astring();
crnl();
check();
mbox = mboxname(mbox);
if(mbox == nil){
Bprint(&bout, "%s NO %s bad mailbox\r\n", tg, cmd);
return;
}
if(cistrcmp(mbox, "mbox") == 0){
Bprint(&bout, "%s NO %s cannot remotely create INBOX\r\n", tg, cmd);
return;
}
if(creatembox(mbox) == -1)
Bprint(&bout, "%s NO %s cannot create mailbox %#Y\r\n", tg, cmd, mbox);
else
Bprint(&bout, "%s OK %#Y %s completed\r\n", tg, mbox, cmd);
}
static void
xdebugcmd(char *tg, char *)
{
char *s, *t;
mustbe(' ');
s = astring();
t = 0;
if(!cistrcmp(s, "file")){
mustbe(' ');
t = astring();
}
crnl();
check();
if(!cistrcmp(s, "on") || !cistrcmp(s, "1")){
Bprint(&bout, "%s OK debug on\r\n", tg);
debug = 1;
}else if(!cistrcmp(s, "file")){
if(!strstr(t, ".."))
snprint(logfile, sizeof logfile, "%s", t);
Bprint(&bout, "%s OK debug file %#Z\r\n", tg, logfile);
}else{
Bprint(&bout, "%s OK debug off\r\n", tg);
debug = 0;
}
}
static void
deletecmd(char *tg, char *cmd)
{
char *mbox;
mustbe(' ');
mbox = astring();
crnl();
check();
mbox = mboxname(mbox);
if(mbox == nil){
Bprint(&bout, "%s NO %s bad mailbox\r\n", tg, cmd);
return;
}
/*
* i don't know if this is a hack or not. a delete of the
* currently-selected box seems fishy. the standard doesn't
* specify any behavior.
*/
if(selected && strcmp(selected->name, mbox) == 0){
ilog("delete: client bug? close of selected mbox %s", selected->fs);
imapstate = Sauthed;
closebox(selected, 1);
selected = nil;
setname("[none]");
}
if(!cistrcmp(mbox, "mbox") || !removembox(mbox) == -1)
Bprint(&bout, "%s NO %s cannot delete mailbox %#Y\r\n", tg, cmd, mbox);
else
Bprint(&bout, "%s OK %#Y %s completed\r\n", tg, mbox, cmd);
}
static void
expungeucmd(char *tg, char *cmd, int uids)
{
int ok;
Msgset *ms;
ms = 0;
if(uids){
mustbe(' ');
ms = msgset(uids);
}
crnl();
ok = deletemsg(selected, ms);
check();
if(ok)
Bprint(&bout, "%s OK %s completed\r\n", tg, cmd);
else
Bprint(&bout, "%s NO %s some messages not expunged\r\n", tg, cmd);
}
static void
expungecmd(char *tg, char *cmd)
{
expungeucmd(tg, cmd, 0);
}
static void
fetchcmd(char *tg, char *cmd)
{
fetchucmd(tg, cmd, 0);
}
static void
fetchucmd(char *tg, char *cmd, int uids)
{
char *uid;
int ok;
uint max;
Fetch *f;
Msgset *ms;
Mblock *ml;
mustbe(' ');
ms = msgset(uids);
mustbe(' ');
f = fetchwhat();
crnl();
uid = "";
if(uids)
uid = "uid ";
max = selected->max;
ml = checkbox(selected, 1);
if(ml != nil)
formsgs(selected, ms, max, uids, fetchseen, f);
closeimp(selected, ml);
ok = ml != nil && formsgs(selected, ms, max, uids, fetchmsg, f);
status(uids, uids);
if(ok)
Bprint(&bout, "%s OK %s%s completed\r\n", tg, uid, cmd);
else{
if(ml == nil)
ilog("nil maillock\n");
Bprint(&bout, "%s NO %s%s failed\r\n", tg, uid, cmd);
}
}
static void
idlecmd(char *tg, char *cmd)
{
int c, pid;
crnl();
Bprint(&bout, "+ idling, waiting for done\r\n");
if(Bflush(&bout) < 0)
writeerr();
if(idlepid < 0){
pid = rfork(RFPROC|RFMEM|RFNOWAIT);
if(pid == 0){
setname("imap idle");
for(;;){
qlock(&imaplock);
if(exiting)
break;
/*
* parent may have changed curdir, but it doesn't change our .
*/
resetcurdir();
check();
if(Bflush(&bout) < 0)
writeerr();
qunlock(&imaplock);
sleep(15*1000);
enableforwarding();
}
_exits(0);
}
idlepid = pid;
}
qunlock(&imaplock);
/*
* clear out the next line, which is supposed to contain (case-insensitive)
* done\n
* this is special code since it has to dance with the idle polling proc
* and handle exiting correctly.
*/
for(;;){
c = getc();
if(c < 0){
qlock(&imaplock);
if(!exiting)
cleaner();
_exits(0);
}
if(c == '\n')
break;
}
qlock(&imaplock);
if(exiting)
_exits(0);
/*
* child may have changed curdir, but it doesn't change our .
*/
resetcurdir();
check();
Bprint(&bout, "%s OK %s terminated\r\n", tg, cmd);
}
static void
listcmd(char *tg, char *cmd)
{
char *s, *t, *ref, *mbox;
mustbe(' ');
s = astring();
mustbe(' ');
t = listmbox();
crnl();
check();
ref = mutf7str(s);
mbox = mutf7str(t);
if(ref == nil || mbox == nil){
Bprint(&bout, "%s BAD %s modified utf-7\r\n", tg, cmd);
return;
}
/*
* special request for hierarchy delimiter and root name
* root name appears to be name up to and including any delimiter,
* or the empty string, if there is no delimiter.
*
* this must change if the # namespace convention is supported.
*/
if(*mbox == '\0'){
s = strchr(ref, '/');
if(s == nil)
ref = "";
else
s[1] = '\0';
Bprint(&bout, "* %s (\\Noselect) \"/\" \"%s\"\r\n", cmd, ref);
Bprint(&bout, "%s OK %s\r\n", tg, cmd);
return;
}
/*
* hairy exception: these take non-fsencoded strings. BUG?
*/
if(cistrcmp(cmd, "lsub") == 0)
lsubboxes(cmd, ref, mbox);
else
listboxes(cmd, ref, mbox);
Bprint(&bout, "%s OK %s completed\r\n", tg, cmd);
}
static void
logincmd(char *tg, char *cmd)
{
char *r, *s, *t;
mustbe(' ');
s = astring(); /* uid */
mustbe(' ');
t = astring(); /* password */
crnl();
if(allowcr){
if(r = crauth(s, t)){
Bprint(&bout, "* NO [ALERT] %s\r\n", r);
Bprint(&bout, "%s NO %s succeeded\r\n", tg, cmd);
}else{
Bprint(&bout, "%s OK %s succeeded\r\n", tg, cmd);
imapstate = Sauthed;
}
return;
}else if(allowpass){
if(r = passauth(s, t))
Bprint(&bout, "%s NO %s failed check [%s]\r\n", tg, cmd, r);
else{
Bprint(&bout, "%s OK %s succeeded\r\n", tg, cmd);
imapstate = Sauthed;
}
return;
}
Bprint(&bout, "%s NO %s plaintext passwords disallowed\r\n", tg, cmd);
}
/*
* logout or x-exit, which doesn't expunge the mailbox
*/
static void
logoutcmd(char *tg, char *cmd)
{
crnl();
if(cmd[0] != 'x' && selected){
closebox(selected, 1);
selected = nil;
}
Bprint(&bout, "* bye\r\n");
Bprint(&bout, "%s OK %s completed\r\n", tg, cmd);
exits(0);
}
static void
namespacecmd(char *tg, char *cmd)
{
crnl();
check();
/*
* personal, other users, shared namespaces
* send back nil or descriptions of (prefix heirarchy-delim) for each case
*/
Bprint(&bout, "* NAMESPACE ((\"\" \"/\")) nil nil\r\n");
Bprint(&bout, "%s OK %s completed\r\n", tg, cmd);
}
static void
noopcmd(char *tg, char *cmd)
{
crnl();
check();
Bprint(&bout, "%s OK %s completed\r\n", tg, cmd);
enableforwarding();
}
static void
getquota0(char *tg, char *cmd, char *r)
{
extern vlong getquota(void);
vlong v;
if(r[0]){
Bprint(&bout, "%s NO %s no such quota root\r\n", tg, cmd);
return;
}
v = getquota();
if(v == -1){
Bprint(&bout, "%s NO %s bad [%r]\r\n", tg, cmd);
return;
}
Bprint(&bout, "* %s "" (storage %llud %d)\r\n", cmd, v/1024, 256*1024);
Bprint(&bout, "%s OK %s completed\r\n", tg, cmd);
}
static void
getquotacmd(char *tg, char *cmd)
{
char *r;
mustbe(' ');
r = astring();
crnl();
check();
getquota0(tg, cmd, r);
}
static void
getquotarootcmd(char *tg, char *cmd)
{
char *r;
mustbe(' ');
r = astring();
crnl();
check();
Bprint(&bout, "* %s %s \"\"\r\n", cmd, r);
getquota0(tg, cmd, "");
}
static void
setquotacmd(char *tg, char *cmd)
{
mustbe(' ');
astring();
mustbe(' ');
mustbe('(');
for(;;){
astring();
mustbe(' ');
number(0);
if(peekc() == ')')
break;
}
getc();
crnl();
check();
Bprint(&bout, "%s NO %s error: can't set that data\r\n", tg, cmd);
}
/*
* this is only a partial implementation
* should copy files to other directories,
* and copy & truncate inbox
*/
static void
renamecmd(char *tg, char *cmd)
{
char *from, *to;
mustbe(' ');
from = astring();
mustbe(' ');
to = astring();
crnl();
check();
to = mboxname(to);
if(to == nil || cistrcmp(to, "mbox") == 0){
Bprint(&bout, "%s NO %s bad mailbox destination name\r\n", tg, cmd);
return;
}
if(access(to, AEXIST) >= 0){
Bprint(&bout, "%s NO %s mailbox already exists\r\n", tg, cmd);
return;
}
from = mboxname(from);
if(from == nil){
Bprint(&bout, "%s NO %s bad mailbox destination name\r\n", tg, cmd);
return;
}
if(renamebox(from, to, strcmp(from, "mbox")))
Bprint(&bout, "%s OK %s completed\r\n", tg, cmd);
else
Bprint(&bout, "%s NO %s failed\r\n", tg, cmd);
}
static void
searchcmd(char *tg, char *cmd)
{
searchucmd(tg, cmd, 0);
}
/*
* mail.app has a vicious habit of appending a message to
* a folder and then immediately searching for it by message-id.
* for a 10,000 message sent folder, this can be quite painful.
*
* evil strategy. for message-id searches, check the last
* message in the mailbox! if that fails, use the normal algorithm.
*/
static Msg*
mailappsucks(Search *s)
{
Msg *m;
if(s->key == SKuid)
s = s->next;
if(s && s->next == nil)
if(s->key == SKheader && cistrcmp(s->hdr, "message-id") == 0){
for(m = selected->msgs; m && m->next; m = m->next)
;
if(m != nil)
if(m->matched = searchmsg(m, s, 0))
return m;
}
return 0;
}
static void
searchucmd(char *tg, char *cmd, int uids)
{
char *uid;
uint id, ld;
Msg *m;
Search rock;
mustbe(' ');
rock.next = nil;
searchkeys(1, &rock);
crnl();
uid = "";
if(uids)
uid = "UID ";
if(rock.next != nil && rock.next->key == SKcharset){
if(cistrcmp(rock.next->s, "utf-8") != 0
&& cistrcmp(rock.next->s, "us-ascii") != 0){
Bprint(&bout, "%s NO [BADCHARSET] (\"US-ASCII\" \"UTF-8\") %s%s failed\r\n", tg, uid, cmd);
checkbox(selected, 0);
status(uids, uids);
return;
}
rock.next = rock.next->next;
}
Bprint(&bout, "* SEARCH");
if(m = mailappsucks(rock.next))
goto cheat;
ld = searchld(rock.next);
for(m = selected->msgs; m != nil; m = m->next)
m->matched = searchmsg(m, rock.next, ld);
for(m = selected->msgs; m != nil; m = m->next){
cheat:
if(m->matched){
if(uids)
id = m->uid;
else
id = m->seq;
Bprint(&bout, " %ud", id);
}
}
Bprint(&bout, "\r\n");
checkbox(selected, 0);
status(uids, uids);
Bprint(&bout, "%s OK %s%s completed\r\n", tg, uid, cmd);
}
static void
selectcmd(char *tg, char *cmd)
{
char *s, *m0, *mbox, buf[Pathlen];
Msg *m;
mustbe(' ');
m0 = astring();
crnl();
if(selected){
imapstate = Sauthed;
closebox(selected, 1);
selected = nil;
setname("[none]");
}
debuglog("select %s", m0);
mbox = mboxname(m0);
if(mbox == nil){
debuglog("select %s [%s] -> no bad", mbox, m0);
Bprint(&bout, "%s NO %s bad mailbox\r\n", tg, cmd);
return;
}
selected = openbox(mbox, "imap", cistrcmp(cmd, "select") == 0);
if(selected == nil){
Bprint(&bout, "%s NO %s can't open mailbox %#Y: %r\r\n", tg, cmd, mbox);
return;
}
setname("%s", decfs(buf, sizeof buf, selected->name));
imapstate = Sselected;
Bprint(&bout, "* FLAGS (\\Seen \\Answered \\Flagged \\Deleted \\Draft)\r\n");
Bprint(&bout, "* %ud EXISTS\r\n", selected->max);
selected->toldmax = selected->max;
Bprint(&bout, "* %ud RECENT\r\n", selected->recent);
selected->toldrecent = selected->recent;
for(m = selected->msgs; m != nil; m = m->next){
if(!m->expunged && (m->flags & Fseen) != Fseen){
Bprint(&bout, "* OK [UNSEEN %ud]\r\n", m->seq);
break;
}
}
Bprint(&bout, "* OK [PERMANENTFLAGS (\\Seen \\Answered \\Flagged \\Draft \\Deleted)]\r\n");
Bprint(&bout, "* OK [UIDNEXT %ud]\r\n", selected->uidnext);
Bprint(&bout, "* OK [UIDVALIDITY %ud]\r\n", selected->uidvalidity);
s = "READ-ONLY";
if(selected->writable)
s = "READ-WRITE";
Bprint(&bout, "%s OK [%s] %s %#Y completed\r\n", tg, s, cmd, mbox);
}
static Namedint statusitems[] =
{
{"MESSAGES", Smessages},
{"RECENT", Srecent},
{"UIDNEXT", Suidnext},
{"UIDVALIDITY", Suidvalidity},
{"UNSEEN", Sunseen},
{nil, 0}
};
static void
statuscmd(char *tg, char *cmd)
{
char *s, *mbox;
int si, i, opened;
uint v;
Box *box;
Msg *m;
mustbe(' ');
mbox = astring();
mustbe(' ');
mustbe('(');
si = 0;
for(;;){
s = atom();
i = mapint(statusitems, s);
if(i == 0)
parseerr("illegal status item");
si |= i;
if(peekc() == ')')
break;
mustbe(' ');
}
mustbe(')');
crnl();
mbox = mboxname(mbox);
if(mbox == nil){
check();
Bprint(&bout, "%s NO %s bad mailbox\r\n", tg, cmd);
return;
}
opened = 0;
if(selected && !strcmp(mbox, selected->name))
box = selected;
else{
box = openbox(mbox, "status", 1);
if(box == nil){
check();
Bprint(&bout, "%s NO [TRYCREATE] %s can't open mailbox %#Y: %r\r\n", tg, cmd, mbox);
return;
}
opened = 1;
}
Bprint(&bout, "* STATUS %#Y (", mbox);
s = "";
for(i = 0; statusitems[i].name != nil; i++)
if(si & statusitems[i].v){
v = 0;
switch(statusitems[i].v){
case Smessages:
v = box->max;
break;
case Srecent:
v = box->recent;
break;
case Suidnext:
v = box->uidnext;
break;
case Suidvalidity:
v = box->uidvalidity;
break;
case Sunseen:
v = 0;
for(m = box->msgs; m != nil; m = m->next)
if((m->flags & Fseen) != Fseen)
v++;
break;
default:
Bprint(&bout, ")");
bye("internal error: status item not implemented");
break;
}
Bprint(&bout, "%s%s %ud", s, statusitems[i].name, v);
s = " ";
}
Bprint(&bout, ")\r\n");
if(opened)
closebox(box, 1);
check();
Bprint(&bout, "%s OK %s completed\r\n", tg, cmd);
}
static void
storecmd(char *tg, char *cmd)
{
storeucmd(tg, cmd, 0);
}
static void
storeucmd(char *tg, char *cmd, int uids)
{
char *uid;
int ok;
uint max;
Mblock *ml;
Msgset *ms;
Store *st;
mustbe(' ');
ms = msgset(uids);
mustbe(' ');
st = storewhat();
crnl();
uid = "";
if(uids)
uid = "uid ";
max = selected->max;
ml = checkbox(selected, 1);
ok = ml != nil && formsgs(selected, ms, max, uids, storemsg, st);
closeimp(selected, ml);
status(uids, uids);
if(ok)
Bprint(&bout, "%s OK %s%s completed\r\n", tg, uid, cmd);
else
Bprint(&bout, "%s NO %s%s failed\r\n", tg, uid, cmd);
}
/*
* minimal implementation of subscribe
* all folders are automatically subscribed,
* and can't be unsubscribed
*/
static void
subscribecmd(char *tg, char *cmd)
{
char *mbox;
int ok;
Box *box;
mustbe(' ');
mbox = astring();
crnl();
check();
mbox = mboxname(mbox);
ok = 0;
if(mbox != nil && (box = openbox(mbox, "subscribe", 0))){
ok = subscribe(mbox, 's');
closebox(box, 1);
}
if(!ok)
Bprint(&bout, "%s NO %s bad mailbox\r\n", tg, cmd);
else
Bprint(&bout, "%s OK %s completed\r\n", tg, cmd);
}
static void
uidcmd(char *tg, char *cmd)
{
char *sub;
mustbe(' ');
sub = atom();
if(cistrcmp(sub, "copy") == 0)
copyucmd(tg, sub, 1);
else if(cistrcmp(sub, "fetch") == 0)
fetchucmd(tg, sub, 1);
else if(cistrcmp(sub, "search") == 0)
searchucmd(tg, sub, 1);
else if(cistrcmp(sub, "store") == 0)
storeucmd(tg, sub, 1);
else if(cistrcmp(sub, "expunge") == 0)
expungeucmd(tg, sub, 1);
else{
clearcmd();
Bprint(&bout, "%s BAD %s illegal uid command %s\r\n", tg, cmd, sub);
}
}
static void
unsubscribecmd(char *tg, char *cmd)
{
char *mbox;
mustbe(' ');
mbox = astring();
crnl();
check();
mbox = mboxname(mbox);
if(mbox == nil || !subscribe(mbox, 'u'))
Bprint(&bout, "%s NO %s can't unsubscribe\r\n", tg, cmd);
else
Bprint(&bout, "%s OK %s completed\r\n", tg, cmd);
}
static char *gbuf;
static void
badsyn(void)
{
debuglog("syntax error [%s]", gbuf);
parseerr("bad syntax");
}
static void
clearcmd(void)
{
int c;
for(;;){
c = getc();
if(c < 0)
bye("end of input");
if(c == '\n')
return;
}
}
static void
crnl(void)
{
int c;
c = getc();
if(c == '\n')
return;
if(c != '\r' || getc() != '\n')
badsyn();
}
static void
mustbe(int c)
{
int x;
if((x = getc()) != c){
ungetc();
ilog("must be '%c' got %c", c, x);
badsyn();
}
}
/*
* flaglist : '(' ')' | '(' flags ')'
*/
static int
flaglist(void)
{
int f;
mustbe('(');
f = 0;
if(peekc() != ')')
f = flags();
mustbe(')');
return f;
}
/*
* flags : flag | flags ' ' flag
* flag : '\' atom | atom
*/
static int
flags(void)
{
char *s;
int ff, flags, c;
flags = 0;
for(;;){
c = peekc();
if(c == '\\'){
mustbe('\\');
s = atomstring(atomstop, "\\");
}else if(strchr(atomstop, c) != nil)
s = atom();
else
break;
ff = mapflag(s);
if(ff == 0)
parseerr("flag not supported");
flags |= ff;
if(peekc() != ' ')
break;
mustbe(' ');
}
if(flags == 0)
parseerr("no flags given");
return flags;
}
/*
* storewhat : osign 'FLAGS' ' ' storeflags
* | osign 'FLAGS.SILENT' ' ' storeflags
* osign :
* | '+' | '-'
* storeflags : flaglist | flags
*/
static Store*
storewhat(void)
{
char *s;
int c, f, w;
c = peekc();
if(c == '+' || c == '-')
mustbe(c);
else
c = 0;
s = atom();
w = 0;
if(cistrcmp(s, "flags") == 0)
w = Stflags;
else if(cistrcmp(s, "flags.silent") == 0)
w = Stflagssilent;
else
parseerr("illegal store attribute");
mustbe(' ');
if(peekc() == '(')
f = flaglist();
else
f = flags();
return mkstore(c, w, f);
}
/*
* fetchwhat : "ALL" | "FULL" | "FAST" | fetchatt | '(' fetchatts ')'
* fetchatts : fetchatt | fetchatts ' ' fetchatt
*/
static char *fetchatom = "(){}%*\"\\[]";
static Fetch*
fetchwhat(void)
{
char *s;
Fetch *f;
if(peekc() == '('){
getc();
f = nil;
for(;;){
s = atomstring(fetchatom, "");
f = fetchatt(s, f);
if(peekc() == ')')
break;
mustbe(' ');
}
getc();
return revfetch(f);
}
s = atomstring(fetchatom, "");
if(cistrcmp(s, "all") == 0)
f = mkfetch(Fflags, mkfetch(Finternaldate, mkfetch(Frfc822size, mkfetch(Fenvelope, nil))));
else if(cistrcmp(s, "fast") == 0)
f = mkfetch(Fflags, mkfetch(Finternaldate, mkfetch(Frfc822size, nil)));
else if(cistrcmp(s, "full") == 0)
f = mkfetch(Fflags, mkfetch(Finternaldate, mkfetch(Frfc822size, mkfetch(Fenvelope, mkfetch(Fbody, nil)))));
else
f = fetchatt(s, nil);
return f;
}
/*
* fetchatt : "ENVELOPE" | "FLAGS" | "INTERNALDATE"
* | "RFC822" | "RFC822.HEADER" | "RFC822.SIZE" | "RFC822.TEXT"
* | "BODYSTRUCTURE"
* | "UID"
* | "BODY"
* | "BODY" bodysubs
* | "BODY.PEEK" bodysubs
* bodysubs : sect
* | sect '<' number '.' nz-number '>'
* sect : '[' sectspec ']'
* sectspec : sectmsgtext
* | sectpart
* | sectpart '.' secttext
* sectpart : nz-number
* | sectpart '.' nz-number
*/
Nlist*
mknlist(void)
{
Nlist *nl;
nl = binalloc(&parsebin, sizeof *nl, 1);
if(nl == nil)
parseerr("out of memory");
nl->n = number(1);
return nl;
}
static Fetch*
fetchatt(char *s, Fetch *f)
{
int c;
Nlist *n;
if(cistrcmp(s, "envelope") == 0)
return mkfetch(Fenvelope, f);
if(cistrcmp(s, "flags") == 0)
return mkfetch(Fflags, f);
if(cistrcmp(s, "internaldate") == 0)
return mkfetch(Finternaldate, f);
if(cistrcmp(s, "RFC822") == 0)
return mkfetch(Frfc822, f);
if(cistrcmp(s, "RFC822.header") == 0)
return mkfetch(Frfc822head, f);
if(cistrcmp(s, "RFC822.size") == 0)
return mkfetch(Frfc822size, f);
if(cistrcmp(s, "RFC822.text") == 0)
return mkfetch(Frfc822text, f);
if(cistrcmp(s, "bodystructure") == 0)
return mkfetch(Fbodystruct, f);
if(cistrcmp(s, "uid") == 0)
return mkfetch(Fuid, f);
if(cistrcmp(s, "body") == 0){
if(peekc() != '[')
return mkfetch(Fbody, f);
f = mkfetch(Fbodysect, f);
}else if(cistrcmp(s, "body.peek") == 0)
f = mkfetch(Fbodypeek, f);
else
parseerr("illegal fetch attribute");
mustbe('[');
c = peekc();
if(c >= '1' && c <= '9'){
n = f->sect = mknlist();
while(peekc() == '.'){
getc();
c = peekc();
if(c < '1' || c > '9')
break;
n->next = mknlist();
n = n->next;
}
}
if(peekc() != ']')
secttext(f, f->sect != nil);
mustbe(']');
if(peekc() != '<')
return f;
f->partial = 1;
mustbe('<');
f->start = number(0);
mustbe('.');
f->size = number(1);
mustbe('>');
return f;
}
/*
* secttext : sectmsgtext | "MIME"
* sectmsgtext : "HEADER"
* | "TEXT"
* | "HEADER.FIELDS" ' ' hdrlist
* | "HEADER.FIELDS.NOT" ' ' hdrlist
* hdrlist : '(' hdrs ')'
* hdrs: : astring
* | hdrs ' ' astring
*/
static void
secttext(Fetch *f, int mimeok)
{
char *s;
Slist *h;
s = atomstring(fetchatom, "");
if(cistrcmp(s, "header") == 0){
f->part = FPhead;
return;
}
if(cistrcmp(s, "text") == 0){
f->part = FPtext;
return;
}
if(mimeok && cistrcmp(s, "mime") == 0){
f->part = FPmime;
return;
}
if(cistrcmp(s, "header.fields") == 0)
f->part = FPheadfields;
else if(cistrcmp(s, "header.fields.not") == 0)
f->part = FPheadfieldsnot;
else
parseerr("illegal fetch section text");
mustbe(' ');
mustbe('(');
h = nil;
for(;;){
h = mkslist(astring(), h);
if(peekc() == ')')
break;
mustbe(' ');
}
mustbe(')');
f->hdrs = revslist(h);
}
/*
* searchwhat : "CHARSET" ' ' astring searchkeys | searchkeys
* searchkeys : searchkey | searchkeys ' ' searchkey
* searchkey : "ALL" | "ANSWERED" | "DELETED" | "FLAGGED" | "NEW" | "OLD" | "RECENT"
* | "SEEN" | "UNANSWERED" | "UNDELETED" | "UNFLAGGED" | "DRAFT" | "UNDRAFT"
* | astrkey ' ' astring
* | datekey ' ' date
* | "KEYWORD" ' ' flag | "UNKEYWORD" flag
* | "LARGER" ' ' number | "SMALLER" ' ' number
* | "HEADER" astring ' ' astring
* | set | "UID" ' ' set
* | "NOT" ' ' searchkey
* | "OR" ' ' searchkey ' ' searchkey
* | '(' searchkeys ')'
* astrkey : "BCC" | "BODY" | "CC" | "FROM" | "SUBJECT" | "TEXT" | "TO"
* datekey : "BEFORE" | "ON" | "SINCE" | "SENTBEFORE" | "SENTON" | "SENTSINCE"
*/
static Namedint searchmap[] =
{
{"ALL", SKall},
{"ANSWERED", SKanswered},
{"DELETED", SKdeleted},
{"FLAGGED", SKflagged},
{"NEW", SKnew},
{"OLD", SKold},
{"RECENT", SKrecent},
{"SEEN", SKseen},
{"UNANSWERED", SKunanswered},
{"UNDELETED", SKundeleted},
{"UNFLAGGED", SKunflagged},
{"DRAFT", SKdraft},
{"UNDRAFT", SKundraft},
{"UNSEEN", SKunseen},
{nil, 0}
};
static Namedint searchmapstr[] =
{
{"CHARSET", SKcharset},
{"BCC", SKbcc},
{"BODY", SKbody},
{"CC", SKcc},
{"FROM", SKfrom},
{"SUBJECT", SKsubject},
{"TEXT", SKtext},
{"TO", SKto},
{nil, 0}
};
static Namedint searchmapdate[] =
{
{"BEFORE", SKbefore},
{"ON", SKon},
{"SINCE", SKsince},
{"SENTBEFORE", SKsentbefore},
{"SENTON", SKsenton},
{"SENTSINCE", SKsentsince},
{nil, 0}
};
static Namedint searchmapflag[] =
{
{"KEYWORD", SKkeyword},
{"UNKEYWORD", SKunkeyword},
{nil, 0}
};
static Namedint searchmapnum[] =
{
{"SMALLER", SKsmaller},
{"LARGER", SKlarger},
{nil, 0}
};
static Search*
searchkeys(int first, Search *tail)
{
Search *s;
for(;;){
if(peekc() == '('){
getc();
tail = searchkeys(0, tail);
mustbe(')');
}else{
s = searchkey(first);
tail->next = s;
tail = s;
}
first = 0;
if(peekc() != ' ')
break;
getc();
}
return tail;
}
static Search*
searchkey(int first)
{
char *a;
int i, c;
Search *sr, rock;
Tm tm;
sr = binalloc(&parsebin, sizeof *sr, 1);
if(sr == nil)
parseerr("out of memory");
c = peekc();
if(c >= '0' && c <= '9'){
sr->key = SKset;
sr->set = msgset(0);
return sr;
}
a = atom();
if(i = mapint(searchmap, a))
sr->key = i;
else if(i = mapint(searchmapstr, a)){
if(!first && i == SKcharset)
parseerr("illegal search key");
sr->key = i;
mustbe(' ');
sr->s = astring();
}else if(i = mapint(searchmapdate, a)){
sr->key = i;
mustbe(' ');
c = peekc();
if(c == '"')
getc();
a = atom();
if(a == nil || !imap4date(&tm, a))
parseerr("bad date format");
sr->year = tm.year;
sr->mon = tm.mon;
sr->mday = tm.mday;
if(c == '"')
mustbe('"');
}else if(i = mapint(searchmapflag, a)){
sr->key = i;
mustbe(' ');
c = peekc();
if(c == '\\'){
mustbe('\\');
a = atomstring(atomstop, "\\");
}else
a = atom();
i = mapflag(a);
if(i == 0)
parseerr("flag not supported");
sr->num = i;
}else if(i = mapint(searchmapnum, a)){
sr->key = i;
mustbe(' ');
sr->num = number(0);
}else if(cistrcmp(a, "HEADER") == 0){
sr->key = SKheader;
mustbe(' ');
sr->hdr = astring();
mustbe(' ');
sr->s = astring();
}else if(cistrcmp(a, "UID") == 0){
sr->key = SKuid;
mustbe(' ');
sr->set = msgset(0);
}else if(cistrcmp(a, "NOT") == 0){
sr->key = SKnot;
mustbe(' ');
rock.next = nil;
searchkeys(0, &rock);
sr->left = rock.next;
}else if(cistrcmp(a, "OR") == 0){
sr->key = SKor;
mustbe(' ');
rock.next = nil;
searchkeys(0, &rock);
sr->left = rock.next;
mustbe(' ');
rock.next = nil;
searchkeys(0, &rock);
sr->right = rock.next;
}else
parseerr("illegal search key");
return sr;
}
/*
* set : seqno
* | seqno ':' seqno
* | set ',' set
* seqno: nz-number
* | '*'
*
*/
static Msgset*
msgset(int uids)
{
uint from, to;
Msgset head, *last, *ms;
last = &head;
head.next = nil;
for(;;){
from = uids ? uidno() : seqno();
to = from;
if(peekc() == ':'){
getc();
to = uids? uidno(): seqno();
}
ms = binalloc(&parsebin, sizeof *ms, 0);
if(ms == nil)
parseerr("out of memory");
if(to < from){
ms->from = to;
ms->to = from;
}else{
ms->from = from;
ms->to = to;
}
ms->next = nil;
last->next = ms;
last = ms;
if(peekc() != ',')
break;
getc();
}
return head.next;
}
static uint
seqno(void)
{
if(peekc() == '*'){
getc();
return ~0UL;
}
return number(1);
}
static uint
uidno(void)
{
if(peekc() == '*'){
getc();
return ~0UL;
}
return number(0);
}
/*
* 7 bit, non-ctl chars, no (){%*"\
* NIL is special case for nstring or parenlist
*/
static char *
atom(void)
{
return atomstring(atomstop, "");
}
/*
* like an atom, but no +
*/
static char *
tag(void)
{
return atomstring("+(){%*\"\\", "");
}
/*
* string or atom allowing %*
*/
static char *
listmbox(void)
{
int c;
c = peekc();
if(c == '{')
return literal();
if(c == '"')
return quoted();
return atomstring("(){\"\\", "");
}
/*
* string or atom
*/
static char *
astring(void)
{
int c;
c = peekc();
if(c == '{')
return literal();
if(c == '"')
return quoted();
return atom();
}
/*
* 7 bit, non-ctl chars, none from exception list
*/
static char *
atomstring(char *disallowed, char *initial)
{
char *s;
int c, ns, as;
ns = strlen(initial);
s = binalloc(&parsebin, ns + Stralloc, 0);
if(s == nil)
parseerr("out of memory");
strcpy(s, initial);
as = ns + Stralloc;
for(;;){
c = getc();
if(c <= ' ' || c >= 0x7f || strchr(disallowed, c) != nil){
ungetc();
break;
}
s[ns++] = c;
if(ns >= as){
s = bingrow(&parsebin, s, as, as + Stralloc, 0);
if(s == nil)
parseerr("out of memory");
as += Stralloc;
}
}
if(ns == 0)
badsyn();
s[ns] = '\0';
return s;
}
/*
* quoted: '"' chars* '"'
* chars: 1-128 except \r and \n
*/
static char *
quoted(void)
{
char *s;
int c, ns, as;
mustbe('"');
s = binalloc(&parsebin, Stralloc, 0);
if(s == nil)
parseerr("out of memory");
as = Stralloc;
ns = 0;
for(;;){
c = getc();
if(c == '"')
break;
if(c < 1 || c > 0x7f || c == '\r' || c == '\n')
badsyn();
if(c == '\\'){
c = getc();
if(c != '\\' && c != '"')
badsyn();
}
s[ns++] = c;
if(ns >= as){
s = bingrow(&parsebin, s, as, as + Stralloc, 0);
if(s == nil)
parseerr("out of memory");
as += Stralloc;
}
}
s[ns] = '\0';
return s;
}
/*
* litlen: {number}\r\n
*/
static uint
litlen(void)
{
uint v;
mustbe('{');
v = number(0);
mustbe('}');
crnl();
return v;
}
/*
* literal: litlen data<0:litlen>
*/
static char*
literal(void)
{
char *s;
uint v;
v = litlen();
s = binalloc(&parsebin, v + 1, 0);
if(s == nil)
parseerr("out of memory");
Bprint(&bout, "+ Ready for literal data\r\n");
if(Bflush(&bout) < 0)
writeerr();
if(v != 0 && Bread(&bin, s, v) != v)
badsyn();
s[v] = '\0';
return s;
}
/*
* digits; number is 32 bits
*/
enum{
Max = 0xffffffff/10,
};
static uint
number(int nonzero)
{
uint n, nn;
int c, first, ovfl;
n = 0;
first = 1;
ovfl = 0;
for(;;){
c = getc();
if(c < '0' || c > '9'){
ungetc();
if(first)
badsyn();
break;
}
c -= '0';
first = 0;
if(n > Max)
ovfl = 1;
nn = n*10 + c;
if(nn < n)
ovfl = 1;
n = nn;
}
if(nonzero && n == 0)
badsyn();
if(ovfl)
parseerr("number out of range\r\n");
return n;
}
static void
logit(char *o)
{
char *s, *p;
if(!debug)
return;
s = strdup(o);
p = strchr(s, ' ');
if(!p)
goto emit;
if(cistrncmp(p, "login ", 6) == 0){
free(s);
return;
}
emit:
for(p = s + strlen(s) - 1; p >= s && (/**p == '\r' ||*/ *p == '\n'); )
*p-- = 0;
ilog("%s", s);
free(s);
}
static char *gbuf;
static char *gbufp = "";
static int
getc(void)
{
if(*gbufp == 0){
free(gbuf);
werrstr("");
gbufp = gbuf = Brdstr(&bin, '\n', 0);
if(gbuf == 0){
ilog("empty line [%d]: %r", bin.fid);
gbufp = "";
return -1;
}
logit(gbuf);
}
return *gbufp++;
}
static void
ungetc(void)
{
if(gbufp > gbuf)
gbufp--;
}
static int
peekc(void)
{
return *gbufp;
}
#ifdef normal
static int
getc(void)
{
return Bgetc(&bin);
}
static void
ungetc(void)
{
Bungetc(&bin);
}
static int
peekc(void)
{
int c;
c = Bgetc(&bin);
Bungetc(&bin);
return c;
}
#endif