changes

linux下qmail的源码 本人加了一些注释

19960731 change: maildir2smtp now prints filenames it's trying and
         relevant portion of SMTP responses.
19960731 change: used succwrite() in maildir2smtp, maildir2qmtp.
         simplifies code quite a bit.
19960731 change: qmail-remote's blast() checks sooner for write errors.
19960731 change: added better -e option to sendmail. tnx TG.
19960731 change: added maildir2qmtp.
19960730 cleanup: eliminated die_nomem() in maildir2smtp.c.
19960730 change: dns_cname now pretends that "foo." is a CNAME for "foo"
	 to give the desired behavior for people who misuse DNS and
	 violate RFC 822. tnx RN.
19960730 change: dns_cname now tests for empty names and ] on every
         loop.
19960730 change: used LSPAWN_BREAK in qmail-send.c for usermap.
19960730 change: updated header example in qmail-header.5.
19960730 change: added printbreak. auto-configured BREAK in dot-qmail.5,
         qmail-lspawn.7, qmail-send.8, qmail-upgrade.7, qlist2.
19960730 change: added printnumd. auto-configured NUMD in qmail-send.8,
         qmail-limits.8.
19960730 change: added printsplit. auto-configured split in qmail-upq.
19960730 change: added dot-qmail.5.
19960730 change: qmail-smtpd now treats HELO as including RSET.
19960730 change: added moreinfo to qlist usage message.
19960729 change: improved an error message in qmail-alias.
19960729 cleanup: merged qmeox(), qmeodx().
19960729 bug: failure to stat .qmail-owner was not an error. impact: if
         stat failed temporarily (e.g., because of NFS), .qmail-owner
	 would be incorrectly ignored, so outgoing message would have
	 wrong envelope sender. fix: qmail-alias does temp_nfsqmail() if
	 stat() returns a temporary error.
19960729 change: added RFCOWNER.
19960729 change: added qmtpd setup question to FAQ.
19960729 change: added qmail-qmtpd.
19960728 change: revamped maildir2smtp error messages.
19960728 change: revamped maildirwatch error messages.
19960728 change: revamped maildir2mbox error messages.
19960728 change: used strerr in maildir_scan().
19960728 change: used strerr in maildir_chdir().
19960728 change: introduced strerr.
19960728 bug: the new tcp-env tried to read from an ndelay socket.
         impact: TCPREMOTEINFO would always be empty. fix: unset ndelay
	 in remoteinfo.c.
19960728 bug: if maildir2smtp saw a permanent failure after MAIL, it
         failed to do RSET. impact: all further messages would be
	 rejected at the MAIL stage. fix: maildir2smtp now always does
	 RSET. tnx JW.
19960728 cleanup: qmail-alias now applies lowercase and dot-to-colon
         conversion directly to dashext, leaving everything else alone.
	 this works since all .qmail access is factored through dashext.
19960727 portability problem: under NeXTStep, -posix is almost entirely
         broken. impact: qmail daemons would dump core under NeXTStep.
	 fix: turn off -posix, except for loading qmail-setup, which
	 needs mkfifo(); NeXT, bless them, didn't put mkfifo() into the
	 C library where it belongs. this requires a new make command,
	 namely loadfifo.
19960727 change: all characters 33-126 are now considered safe for logs.
         tnx MD.
19960727 cleanup: eliminated qp variable from mailforward().
19960727 cleanup: maildirwatch.c includes headerbody.h.
19960727 cleanup: eliminated match from maildirwatch.c.
19960727 cleanup: eliminated code variable from maildir2smtp.c:doit().
19960727 cleanup: maildir2smtp.c includes scan.h.
19960727 cleanup: maildir.c includes str.h.
19960727 cleanup: qmail-popup.c now includes exit.h.
19960727 cleanup: qmail-pop3d.c now includes exit.h.
19960727 cleanup: eliminated path from qmail-start.c.
19960727 cleanup: eliminated birthplusnn from nextretry().
19960727 cleanup: eliminated r from timeoutconn().
19960727 cleanup: tcpto.c now includes byte.h.
19960727 cleanup: spawn.c now declares initialize().
19960727 cleanup: qmail-lspawn.c now includes str.h, byte.h.
19960727 cleanup: qmail-inject.c now includes quote.h.
19960727 change: qmail-check now checks separately for group
         readability and other readability.
19960727 bug: maildir2smtp didn't check flagehlo in PIPELINING parsing.
         impact: a server that said PIPELINING at any point, not just
	 EHLO, would receive pipelined data. fix: check flagehlo.
19960727 bug: readsubdir was calling pause(). impact: if a subdirectory
         was removed, qmail-send would hang. fix: use rs->pause().
19960727 change: used error_str in qmail-qread.
19960727 change: qmail-qread now looks for local/remote open errors.
19960727 cleanup: added warn() in qmail-qread.c.
19960727 change: qmail-qread now exits 111 for temporary errors.
19960727 change: used error_str in qmail-setup.
19960727 change: introduced error_str.
19960727 change: replaced qmail-check with make check in INSTALL.
19960727 change: added check target to Makefile.
19960727 change: replaced qmail-setup with make setup in INSTALL.
19960727 change: indirected fake targets through do- targets.
19960727 change: added setup target to Makefile.
19960727 change: qmail-makectl now makes sure that defaultdomain has
         at least one dot. e.g., enteract.com -> enteract.com, not com.
19960726 bug: quote() failed to quote commas. impact: addresses
         containing commas would not have been quoted correctly for
	 Return-Path or for SMTP MAIL FROM. fix: quote commas.
19960726 change: sendmail now mentions qmail-qread, not qmail-mailq.
19960726 change: qmail-alias now expects ext arg. this eliminates
         LSPAWN_BREAK from qmail-alias and gives lspawn almost complete
	 control over the local -> ~user/.qmail-ext transformation. the
	 exception is that qmail-alias always uses ~user/.qmail,
	 ignoring ext, if local is the same as user.
19960726 change: qmail-lspawn passes ext to qmail-alias.
19960726 change: alloc() now uses up a 4K space before calling malloc().
19960726 change: ipalloc allocation base is now 10. 100 was silly.
19960726 change: stralloc allocation base is now 30.
19960726 change: injectbounce() now supports the owner hack.
19960726 change: qmail-smtpd no longer requires HELO. tnx K1J.
19960726 cleanup: replaced makereceived() with dohelo().
19960726 change: qmail-smtpd is back to 555 for syntax errors.
19960725 change: qmail-alias now supports the owner hack. tnx to RN for
         prodding me to look at this problem.
19960725 change: senderadd() now supports the owner hack.
19960725 cleanup: split off senderadd().
19960725 change: added pine-crashing note to FAQ.
19960725 change: added procmail config.h note to INSTALL.mbox.
19960725 change: added elm TMPDIR note to INSTALL.mbox.
19960725 change: added pine.conf note to INSTALL.mbox.
19960724 change: added fixup note to FAQ.
19960724 change: qmail-inject now exits 111 for temporary errors.
19960724 change: qmail-smtpd now appends RELAYCLIENT to incoming
         recipient domain names.
19960724 cleanup: moved relayclient out of qmail-smtpd's addrallowed()
         into caller.
19960724 change: added rcpthosts wildcards.
19960724 change: added clean target to Makefile.
19960723 change: added virtualdomains exceptions.
19960722 change: added BLURB4.
19960722 change: added BLURB3.
19960722 change: eliminated smarthost and localnet.
19960722 change: incorporated relaymap, contributed by LW. renamed it
         as smtproutes.
19960722 change: qmail-popup now supports APOP. suggested by BG, who
         distributed similar changes.
19960722 change: qmail-popup now sends APOP timestamp to checkpassword.
19960722 cleanup: in qmail-popup, split off doanddie().
19960722 change: qmail-popup now prints APOP timestamp in banner.
19960722 change: added hostname argument to qmail-popup.
19960722 cleanup: in qmail-popup, split out() into out(), outflush().
19960722 cleanup: in qmail-popup, introduced pop3_greet().
19960721 portability problem: under Unisys SVR4, hostname is not in the
         usual path. impact: qmail-makectl fails. fix: added hostname
	 command here, used it in qmail-makectl.
19960721 portability problem: on some sysctl-based systems, apparently
         gethostname() doesn't write anything if the output buffer is
	 too small. it should write a truncated name. impact: if anyone
	 has a hostname longer than 64 characters, maildirs could get up
	 to 64 characters of garbage, rather than a truncated hostname.
	 fix: qmail-alias now does *host = 0 before calling gethostname.
19960721 change: updated FAQ examples from qsmhook to preline.
19960721 change: added preline.
19960721 change: qsmhook now uses signal_init, signal_uninit.
19960721 change: qsmhook now checks specifically for empty args.
19960721 change: documented mbox.
19960721 change: added EXT, EXT2, EXT3, EXT4.
19960721 change: added LAST response to qmail-pop3d, always returning
         OK 0. tnx RN.
19960721 change: added qmail home page to README.
19960721 change: added HELP response to qmail-smtpd. tnx RN.
19960720 change: expanded, vertically, the qmail-inject error message
         for unparseable header fields.
19960720 change: logo is now dolphin. tnx CEJ.
19960719 qmail 0.76, beta.
19960719 change: used LSPAWN_BREAK in qmail-alias for deciding how to
         handle extensions. this should produce better behavior in the
	 (unsupported) case that LSPAWN_BREAK is not a hyphen.
19960719 bug: qmail-smtpd didn't check for null arg on MAIL, RCPT.
         impact: qmail-smtpd would deref 0 and crash. fix: qmail-smtpd
	 now gives syntax error on null arg.
19960719 change: documented UFLINE in qmail-command.8. tnx TG.
19960718 change: added maildir2smtp.
19960718 cleanup: introduced maildir.c. used it in maildir2mbox.c,
         maildirwatch.c.
19960718 change: added maildirwatch.
19960718 cleanup: maildir2mbox now sets up pq2 as it is deleting from
         pq, rather than simultaneously with pq.
19960718 change: added H_DELIVEREDTO.
19960718 portability problem: Unisys requires -lsocket -lnsl. impact:
         couldn't compile under Unisys. fix: added unix_sv section to
	 make-cmds.sh. tnx TVP.
19960718 change: added unix_sv section in find-systype. tnx TVP.
19960717 change: qmail-alias now appends newline if .qmail does not end
         with a newline. tnx MC.
19960717 change: qmail-alias now defers delivery for a blank line only
         if it is the first line of the file. handles user behavior
	 described by MC of putting many newlines at end of file.
19960717 bug: qmail-inject looked for dots in user part, not just host
         part, when deciding whether to use defaultdomain. impact: the
	 address joe.bloggs@here didn't have defaultdomain added. fix:
	 qmail-inject now stops at the @.
19960717 change: updated INSTALL.alias to mention qmsmac.
19960717 change: syntax error code for SMTP is now 501.
19960717 change: added -e option to sendmail. tnx TG.
19960716 change: changed ~alias files to .qmail-local, not .qmaillocal.
	 suggested by many people.
19960716 change: redid qmail-alias/qmail-lspawn interface.
19960716 change: replaced EXTENSION, USEREXT with LOCAL.
19960716 change: qmail-queue now removes intd, mess upon error, as long
	 as it doesn't time out. suggested by BB et al.
19960716 change: added flagmademess, flagmadeintd to qmail-queue.c.
19960716 cleanup: changed todofd to intdfd in qmail-queue.c.
19960716 cleanup: added cleanup() to qmail-queue.c.
19960716 change: added timeout to tcp-env.c, default 30 seconds.
19960716 change: remoteinfo_get() now uses timeoutconn().
19960715 change: added procmail config.h note to FAQ.
19960704 change: qmail-upgrade.7 now warns administrators that ~alias
         generally doesn't apply to addresses starting with a user name.
19960703 change: added echo \c note to FAQ. tnx PJG.
19960702 change: qmail-smtpd now accepts HELO without an argument.
         tnx K1J, J1B.
19960627 change: qmail-lspawn.8 now mentions that qmail-lspawn doesn't
         set up supplementary groups. tnx TG.
19960625 portability problem: under Linux, read(,,0) doesn't do proper
         error slippage. impact: timeoutconn() would always report
	 success; if a connection failed, qmail-remote would report a
	 greeting failure and skip all further MX records. tnx ME. fix:
	 timeoutconn() now uses getpeername() to check for success.
19960625 change: qmail-smtpd now mentions disk full for QQT_WRITE.
19960625 change: qmail-inject now mentions disk full for QQT_WRITE.
19960622 change: if RELAYCLIENT is set, qmail-smtpd skips rcpthosts.
19960609 change: updated INSTALL for current SMTP responses.
19960607 change: clarified INSTALL.qsmhook examples. tnx S1R.
19960607 change: added subject parsing to qlist.c. tnx RN.
19960607 cleanup: used case_diffb in qlist.c.
19960607 change: added extra log information to INSTALL examples.
19960606 change: added -Pn to uucp line in FAQ. tnx DWS.
19960605 portability problem: under Solaris, /usr/bin/groups incorrectly
         reports your groups in /etc/group, rather than the results of
	 getgroups(). tnx MD, PJG. impact: test #19 in INSTALL fails.
	 fix: added special note to test #19 (sigh) about Solaris.
19960605 change: improved maildir setup commands in INSTALL.mbox.
19960605 change: on success, qmail-alias logs forwarding qp. 9 lines
         extra code.
19960605 change: qmail-send logs qp for bounce. 6 lines extra code.
19960605 change: qmail-smtpd includes qp in its response when it accepts
         a message. 7 lines extra code. requested by MD and others.