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-rw-r--r--AUTHORS37
-rw-r--r--CHANGES1
-rw-r--r--COPYING339
-rw-r--r--INSTALL0
-rw-r--r--Makefile.am4
-rw-r--r--README1
-rw-r--r--configure.in39
-rw-r--r--nullpop.c409
8 files changed, 830 insertions, 0 deletions
diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..f6b4ec8
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1,37 @@
+Nate Nielsen <nielsen@memberwebs.com> used vm-pop3d code and gutted it to
+create nullpop.
+
+---------------------------------------------------------------------------
+
+Jeremy C. Reed <reed@reedmedia.net> is the maintainer of virtualmail-pop3d.
+(vm-pop3d is a fork of the gnu-pop3d project.) Previously, he developed
+ten patches for gnu-pop3d which were widely used, but never integrated.
+
+=== The following is the original AUTHORS file for gnu-pop3d 0.9.8 ===
+
+Jakob 'sparky' Kaivo <jkaivo@nodomainname.net> is the original and primary
+author of GNU POP, as well as the maintainer.
+
+Sean 'Shaleh' Perry <shaleh@debian.org> has been invaluable in helping to test
+code and make improvements, including the addition of the CAPA command, the
+idea of using the message struct rather than several different arrays, and
+several memory use issues. He has also helped keep things up to snuff with
+RFCs, and contributed the Debian package stuff and man page. He also looks
+over code before release to make sure I didn't miss anything <g> and lots of
+other work.
+
+Oscar Wahlberg <oscar.wahlberg@connecta.se> contributed APOP and some other
+improvements.
+
+Edgard Castro <castro@usmatrix.net> contributed a much better gnu-pop3d.spec
+file (for RedHat RPM) than the original, as well as a new gnu-pop3d.init script
+and PAM support.
+
+Mike Klinkert <michael@cs.vu.nl> contributed the code for opening alternatvie
+mailboxes (such as might be created by procmail).
+
+Daniel Bergstrom <noa@melody.se> contributed some improvements for PAM support
+and autoconf.
+
+R. Soderberg <occupant@coldflame.net> contributed various autoconf fixes and
+improvements.
diff --git a/CHANGES b/CHANGES
new file mode 100644
index 0000000..ce80146
--- /dev/null
+++ b/CHANGES
@@ -0,0 +1 @@
+0.1 Initial release
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..a43ea21
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,339 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 675 Mass Ave, Cambridge, MA 02139, USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+ To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+ For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have. You must make sure that they, too, receive or can get the
+source code. And you must show them these terms so they know their
+rights.
+
+ We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+ Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software. If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+ Finally, any free program is threatened constantly by software
+patents. We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary. To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+ The precise terms and conditions for copying, distribution and
+modification follow.
+
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License. The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language. (Hereinafter, translation is included without limitation in
+the term "modification".) Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope. The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+ 1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+ 2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+ a) You must cause the modified files to carry prominent notices
+ stating that you changed the files and the date of any change.
+
+ b) You must cause any work that you distribute or publish, that in
+ whole or in part contains or is derived from the Program or any
+ part thereof, to be licensed as a whole at no charge to all third
+ parties under the terms of this License.
+
+ c) If the modified program normally reads commands interactively
+ when run, you must cause it, when started running for such
+ interactive use in the most ordinary way, to print or display an
+ announcement including an appropriate copyright notice and a
+ notice that there is no warranty (or else, saying that you provide
+ a warranty) and that users may redistribute the program under
+ these conditions, and telling the user how to view a copy of this
+ License. (Exception: if the Program itself is interactive but
+ does not normally print such an announcement, your work based on
+ the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+ 3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+ a) Accompany it with the complete corresponding machine-readable
+ source code, which must be distributed under the terms of Sections
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+
+ b) Accompany it with a written offer, valid for at least three
+ years, to give any third party, for a charge no more than your
+ cost of physically performing source distribution, a complete
+ machine-readable copy of the corresponding source code, to be
+ distributed under the terms of Sections 1 and 2 above on a medium
+ customarily used for software interchange; or,
+
+ c) Accompany it with the information you received as to the offer
+ to distribute corresponding source code. (This alternative is
+ allowed only for noncommercial distribution and only if you
+ received the program in object code or executable form with such
+ an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it. For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable. However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
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+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+ 4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License. Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+ 5. You are not required to accept this License, since you have not
+signed it. However, nothing else grants you permission to modify or
+distribute the Program or its derivative works. These actions are
+prohibited by law if you do not accept this License. Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+ 6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions. You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+ 7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all. For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices. Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+ 8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded. In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+ 9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation. If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+ 10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission. For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this. Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+ NO WARRANTY
+
+ 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+ 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+ END OF TERMS AND CONDITIONS
+
+ Appendix: How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) 19yy <name of author>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+ Gnomovision version 69, Copyright (C) 19yy name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Library General
+Public License instead of this License.
diff --git a/INSTALL b/INSTALL
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/INSTALL
diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..3ab7a5f
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,4 @@
+
+libexec_PROGRAMS = nullpop
+
+nullpop_SOURCES = nullpop.c
diff --git a/README b/README
new file mode 100644
index 0000000..00f6fdd
--- /dev/null
+++ b/README
@@ -0,0 +1 @@
+NULLPOP readme
diff --git a/configure.in b/configure.in
new file mode 100644
index 0000000..40e6806
--- /dev/null
+++ b/configure.in
@@ -0,0 +1,39 @@
+
+
+dnl Process this file with autoconf to produce a configure script.
+AC_INIT(nullpop, 0.1, nielsen@memberwebs.com)
+AM_INIT_AUTOMAKE(nullpop, 0.1)
+
+dnl Process this file with autoconf to produce a configure script.
+AC_INIT(nullpop.c)
+
+dnl Checks for programs.
+AC_PROG_CC
+AC_PROG_INSTALL
+AC_PROG_LN_S
+
+dnl Checks for header files.
+AC_HEADER_STDC
+AC_HEADER_SYS_WAIT
+AC_CHECK_HEADERS(fcntl.h limits.h paths.h sys/file.h sys/time.h syslog.h unistd.h)
+
+dnl Checks for typedefs, structures, and compiler characteristics.
+AC_C_CONST
+AC_TYPE_SIZE_T
+AC_HEADER_TIME
+AC_TYPE_UID_T
+
+dnl Checks for library functions.
+AC_FUNC_ALLOCA
+AC_TYPE_SIGNAL
+AC_CHECK_FUNCS(gethostname select socket strdup strerror strstr)
+
+AC_ARG_ENABLE(debug,
+[ --enable-debug enable debugging messages and logging.],
+[
+AC_MSG_RESULT(debugging enabled)
+AC_DEFINE(DEBUG)
+],)
+
+AC_CONFIG_HEADER(config.h)
+AC_OUTPUT(Makefile)
diff --git a/nullpop.c b/nullpop.c
new file mode 100644
index 0000000..3be7da5
--- /dev/null
+++ b/nullpop.c
@@ -0,0 +1,409 @@
+/* nullpop: A NOOP POP3 Server. Based on:
+
+ virtualmail-pop3d - a POP3 server with virtual domains support
+ This code is licensed under the GPL; it has several authors.
+ vm-pop3d is based on:
+ GNU POP3 - a small, fast, and efficient POP3 daemon
+ Copyright (C) 1999 Jakob 'sparky' Kaivo <jkaivo@nodomainname.net>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+
+#define _GNU_SOURCE
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <signal.h>
+#include <sys/file.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <grp.h>
+#include <syslog.h>
+#include <ctype.h>
+
+/* A command that doesn't exist */
+#define BAD_COMMAND "Invalid command"
+
+/* Incorrect number of arguments passed to a command */
+#define BAD_ARGS "Invalid arguments"
+
+/* An action on a message that doesn't exist */
+#define NO_MESG "No such message"
+
+/* A command that is known but not implemented */
+#define NOT_IMPL "Not implemented"
+
+/* The command argument was > 40 characters */
+#define TOO_LONG "Argument too long"
+
+/* Longest legal POP command */
+#define POP_MAXCMDLEN 255
+
+
+
+/* Maximum length of a hostname (is this defined somewhere else?) */
+#ifndef MAXHOSTNAMELEN
+#define MAXHOSTNAMELEN 64
+#endif
+
+#define OK 0
+#define ERR_BAD_ARGS 2
+#define ERR_NO_MESG 4
+#define ERR_NOT_IMPL 5
+#define ERR_BAD_CMD 6
+#define ERR_TOO_LONG 8
+#define ERR_NO_MEM 9
+#define ERR_DEAD_SOCK 10
+#define ERR_SIGNAL 11
+#define ERR_FILE 12
+#define ERR_NO_OFILE 13
+#define ERR_TIMEOUT 14
+
+unsigned int timeout;
+int ifile;
+FILE *ofile;
+
+/* Prints out usage information and exits the program */
+void
+pop3_usage(char *argv0)
+{
+ printf("Usage: %s [OPTIONS]\n", argv0);
+ printf("Runs the nullpop POP3 daemon.\n\n");
+ printf(" -t sets idle timeout to TIMEOUT seconds\n");
+ exit(2);
+}
+
+/* This is called if it needs to quit without going to the UPDATE stage.
+ This is used for conditions such as out of memory, a broken socket, or
+ being killed on a signal */
+int
+pop3_abquit(int reason)
+{
+ switch (reason) {
+ case ERR_NO_MEM:
+ if (NULL != ofile)
+ fprintf(ofile, "-ERR Out of memory, quitting\r\n");
+ syslog(LOG_ERR, "Out of memory");
+ break;
+ case ERR_DEAD_SOCK:
+ if (NULL != ofile) /* should this even print to socket? */
+ fprintf(ofile, "-ERR Socket closed, quitting\r\n");
+ syslog(LOG_ERR, "Socket closed");
+ break;
+ case ERR_SIGNAL:
+ if (NULL != ofile)
+ fprintf(ofile, "-ERR Quitting on signal\r\n");
+ break;
+ case ERR_TIMEOUT:
+ if (NULL != ofile)
+ fprintf(ofile, "-ERR Session timed out\r\n");
+ else
+ syslog(LOG_INFO, "Session timed out for no user");
+ break;
+ case ERR_NO_OFILE:
+ syslog(LOG_ERR, "Quitting - couldn't open stream");
+ break;
+ default:
+ if (NULL != ofile)
+ fprintf(ofile, "-ERR Quitting (reason unknown)\r\n");
+ syslog(LOG_ERR, "Unknown quit");
+ break;
+ }
+ fflush(ofile);
+ exit(1);
+}
+
+/* Default signal handler to call the pop3_abquit() function */
+void
+pop3_signal(int signal)
+{
+ syslog(LOG_ERR, "Quitting on signal: %d", signal);
+ pop3_abquit(ERR_SIGNAL);
+}
+
+
+/* Gets a line of input from the client */
+char *
+pop3_readline(int fd)
+{
+ fd_set rfds;
+ struct timeval tv;
+ char buf[1024], *ret = NULL;
+ int available;
+
+ FD_ZERO(&rfds);
+ FD_SET(fd, &rfds);
+ tv.tv_sec = timeout;
+ tv.tv_usec = 0;
+ memset(buf, '\0', 1024);
+
+ while (strchr(buf, '\n') == NULL) {
+ if (timeout > 0) {
+ available = select(fd + 1, &rfds, NULL, NULL, &tv);
+ if (!available)
+ pop3_abquit(ERR_TIMEOUT);
+ }
+ if (read(fd, buf, 1024) < 1)
+ pop3_abquit(ERR_DEAD_SOCK);
+
+ if (ret == NULL) {
+ ret = malloc((strlen(buf) + 1) * sizeof(char));
+ strcpy(ret, buf);
+ } else {
+ ret = realloc(ret, (strlen(ret) + strlen(buf) + 1) * sizeof(char));
+ strcat(ret, buf);
+ }
+ }
+ return ret;
+}
+
+/* Takes a string as input and returns either the remainder of the string
+ after the first space, or a zero length string if no space */
+char *
+pop3_args(const char *cmd)
+{
+ int space = -1, i = 0, len;
+ char *buf;
+
+ len = strlen(cmd) + 1;
+ buf = malloc(len * sizeof(char));
+ if (buf == NULL)
+ pop3_abquit(ERR_NO_MEM);
+
+ while (space < 0 && i < len) {
+ if (cmd[i] == ' ')
+ space = i + 1;
+ else if (cmd[i] == '\0' || cmd[i] == '\r' || cmd[i] == '\n')
+ len = i;
+ i++;
+ }
+
+ if (space < 0)
+ buf[0] = '\0';
+ else {
+ for (i = space; i < len; i++)
+ if (cmd[i] == '\0' || cmd[i] == '\r' || cmd[i] == '\n')
+ buf[i - space] = '\0';
+ else
+ buf[i - space] = cmd[i];
+ }
+
+ return buf;
+}
+
+/* This takes a string and returns the string up to the first space or end of
+ the string, whichever occurs first */
+char *
+pop3_cmd(const char *cmd)
+{
+ char *buf;
+ int i = 0, len;
+
+ len = strlen(cmd) + 1;
+ buf = malloc(len * sizeof(char));
+ if (buf == NULL)
+ pop3_abquit(ERR_NO_MEM);
+
+ for (i = 0; i < len; i++) {
+ if (cmd[i] == ' ' || cmd[i] == '\0' || cmd[i] == '\r' || cmd[i] == '\n')
+ len = i;
+ else
+ buf[i] = cmd[i];
+ }
+ buf[i - 1] = '\0';
+ return buf;
+}
+
+/* The main part of the daemon. This function reads input from the client and
+ executes the proper functions. Also handles the bulk of error reporting. */
+int
+pop3_mainloop(int infile, int outfile)
+{
+ int status = OK;
+ char *buf, *arg, *cmd;
+ struct sockaddr_in name;
+ int namelen = sizeof(name);
+ char *temp_domain;
+
+ ifile = infile;
+ ofile = fdopen(outfile, "w+");
+ if (ofile == NULL)
+ pop3_abquit(ERR_NO_OFILE);
+
+ if (getpeername(infile,
+ (struct sockaddr *) & name, (socklen_t *) & namelen) == 0) {
+ if ((temp_domain = (char *) inet_ntoa(name.sin_addr)))
+ syslog(LOG_INFO,"Connect from %s", temp_domain);
+ else
+ syslog(LOG_INFO, "Connection opened");
+ }
+ else
+ syslog(LOG_INFO, "Incoming connection opened");
+
+ fflush(ofile);
+ fprintf(ofile, "+OK POP3 \r\n");
+
+ for (;;) {
+ fflush(ofile);
+ status = OK;
+ buf = pop3_readline(ifile);
+ cmd = pop3_cmd(buf);
+ arg = pop3_args(buf);
+
+ if (strlen(arg) > POP_MAXCMDLEN || strlen(cmd) > POP_MAXCMDLEN)
+ status = ERR_TOO_LONG;
+ else if (strlen(cmd) > 4)
+ status = ERR_BAD_CMD;
+ else if (strncasecmp(cmd, "USER", 4) == 0) {
+ fprintf(ofile, "+OK\r\n");
+ status = OK;
+ } else if (strncasecmp(cmd, "PASS", 4) == 0) {
+ fprintf(ofile, "+OK\r\n");
+ status = OK;
+ } else if (strncasecmp(cmd, "QUIT", 4) == 0) {
+ fprintf(ofile, "+OK\r\n");
+ fflush(ofile);
+ break;
+ } else if (strncasecmp(cmd, "AUTH", 4) == 0) {
+ status = ERR_NOT_IMPL;
+ } else if (strncasecmp(cmd, "STAT", 4) == 0) {
+ fprintf(ofile, "+OK %d %d\r\n", 0, 0);
+ status = OK;
+ } else if (strncasecmp(cmd, "LIST", 4) == 0) {
+ if (strchr(arg, ' ') != NULL) {
+ status = ERR_BAD_ARGS;
+ } else if (strlen(arg) == 0) {
+ fprintf(ofile, "+OK\r\n");
+ fprintf(ofile, ".\r\n");
+ status = OK;
+ } else {
+ status = ERR_NO_MESG;
+ }
+ } else if (strncasecmp(cmd, "RETR", 4) == 0) {
+ if ((strlen(arg) == 0) || (strchr(arg, ' ') != NULL))
+ status = ERR_BAD_ARGS;
+ else
+ status = ERR_NO_MESG;
+ } else if (strncasecmp(cmd, "DELE", 4) == 0) {
+ if ((strlen(arg) == 0) || (strchr(arg, ' ') != NULL))
+ status = ERR_BAD_ARGS;
+ else
+ status = ERR_NO_MESG;
+ } else if (strncasecmp(cmd, "NOOP", 4) == 0) {
+ if (strlen(arg) != 0)
+ status = ERR_BAD_ARGS;
+ else {
+ fprintf(ofile, "+OK\r\n");
+ status = OK;
+ }
+ } else if (strncasecmp(cmd, "RSET", 4) == 0) {
+ if (strlen(arg) != 0)
+ status = ERR_BAD_ARGS;
+ else {
+ fprintf(ofile, "+OK\r\n");
+ status = OK;
+ }
+ } else if ((strncasecmp(cmd, "TOP", 3) == 0) && (strlen(cmd) == 3)) {
+ status = ERR_NO_MESG;
+ } else if (strncasecmp(cmd, "UIDL", 4) == 0) {
+ if (strchr(arg, ' ') != NULL)
+ status = ERR_BAD_ARGS;
+ else
+ status = ERR_NO_MESG;
+ } else if (strncasecmp(cmd, "CAPA", 4) == 0) {
+ if (strlen(arg) != 0)
+ status = ERR_BAD_ARGS;
+ else {
+ fprintf(ofile, "+OK Capability list follows\r\n");
+ fprintf(ofile, "TOP\r\n");
+ fprintf(ofile, "USER\r\n");
+ fprintf(ofile, "RESP-CODES\r\n");
+ fprintf(ofile, "UIDL\r\n");
+ fprintf(ofile, ".\r\n");
+ status = OK;
+ }
+ } else {
+ status = ERR_BAD_CMD;
+ }
+
+ if (status == OK)
+ fflush(ofile);
+ else if (status == ERR_BAD_ARGS)
+ fprintf(ofile, "-ERR " BAD_ARGS "\r\n");
+ else if (status == ERR_NO_MESG)
+ fprintf(ofile, "-ERR " NO_MESG "\r\n");
+ else if (status == ERR_NOT_IMPL)
+ fprintf(ofile, "-ERR " NOT_IMPL "\r\n");
+ else if (status == ERR_BAD_CMD)
+ fprintf(ofile, "-ERR " BAD_COMMAND "\r\n");
+ else if (status == ERR_TOO_LONG)
+ fprintf(ofile, "-ERR " TOO_LONG "\r\n");
+
+ free(buf);
+ free(cmd);
+ free(arg);
+ }
+
+ fflush(ofile);
+ return OK;
+}
+
+int
+main(int argc, char **argv)
+{
+ int c = 0;
+ timeout = 0; /* Timeout turned off */
+
+ /* Set the signal handlers */
+ signal(SIGINT, pop3_signal);
+ signal(SIGQUIT, pop3_signal);
+ signal(SIGTERM, pop3_signal);
+
+/* Don't die when a process goes away unexpectedly.
+ Ignore write on a pipe with no reader. */
+ signal(SIGPIPE, SIG_IGN);
+
+ while ((c = getopt(argc, argv, "t:") && c)) {
+ switch (c) {
+ case 't':
+ timeout = atoi(optarg);
+ break;
+ default:
+ pop3_usage(argv[0]);
+ break;
+ }
+ }
+
+ /* Set up for syslog */
+ openlog("nullpop", LOG_PID, LOG_MAIL);
+
+ pop3_mainloop(fileno(stdin), fileno(stdout));
+
+ /* Close the syslog connection and exit */
+ closelog();
+ return OK;
+}