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Importación de la libpopc.

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GNU GENERAL PUBLIC LICENSE
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Installation Instructions
*************************
Copyright (C) 1994-1996, 1999-2002, 2004-2016 Free Software
Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. This file is offered as-is,
without warranty of any kind.
Basic Installation
==================
Briefly, the shell command './configure && make && make install'
should configure, build, and install this package. The following
more-detailed instructions are generic; see the 'README' file for
instructions specific to this package. Some packages provide this
'INSTALL' file but do not implement all of the features documented
below. The lack of an optional feature in a given package is not
necessarily a bug. More recommendations for GNU packages can be found
in *note Makefile Conventions: (standards)Makefile Conventions.
The 'configure' shell script attempts to guess correct values for
various system-dependent variables used during compilation. It uses
those values to create a 'Makefile' in each directory of the package.
It may also create one or more '.h' files containing system-dependent
definitions. Finally, it creates a shell script 'config.status' that
you can run in the future to recreate the current configuration, and a
file 'config.log' containing compiler output (useful mainly for
debugging 'configure').
It can also use an optional file (typically called 'config.cache' and
enabled with '--cache-file=config.cache' or simply '-C') that saves the
results of its tests to speed up reconfiguring. Caching is disabled by
default to prevent problems with accidental use of stale cache files.
If you need to do unusual things to compile the package, please try
to figure out how 'configure' could check whether to do them, and mail
diffs or instructions to the address given in the 'README' so they can
be considered for the next release. If you are using the cache, and at
some point 'config.cache' contains results you don't want to keep, you
may remove or edit it.
The file 'configure.ac' (or 'configure.in') is used to create
'configure' by a program called 'autoconf'. You need 'configure.ac' if
you want to change it or regenerate 'configure' using a newer version of
'autoconf'.
The simplest way to compile this package is:
1. 'cd' to the directory containing the package's source code and type
'./configure' to configure the package for your system.
Running 'configure' might take a while. While running, it prints
some messages telling which features it is checking for.
2. Type 'make' to compile the package.
3. Optionally, type 'make check' to run any self-tests that come with
the package, generally using the just-built uninstalled binaries.
4. Type 'make install' to install the programs and any data files and
documentation. When installing into a prefix owned by root, it is
recommended that the package be configured and built as a regular
user, and only the 'make install' phase executed with root
privileges.
5. Optionally, type 'make installcheck' to repeat any self-tests, but
this time using the binaries in their final installed location.
This target does not install anything. Running this target as a
regular user, particularly if the prior 'make install' required
root privileges, verifies that the installation completed
correctly.
6. You can remove the program binaries and object files from the
source code directory by typing 'make clean'. To also remove the
files that 'configure' created (so you can compile the package for
a different kind of computer), type 'make distclean'. There is
also a 'make maintainer-clean' target, but that is intended mainly
for the package's developers. If you use it, you may have to get
all sorts of other programs in order to regenerate files that came
with the distribution.
7. Often, you can also type 'make uninstall' to remove the installed
files again. In practice, not all packages have tested that
uninstallation works correctly, even though it is required by the
GNU Coding Standards.
8. Some packages, particularly those that use Automake, provide 'make
distcheck', which can by used by developers to test that all other
targets like 'make install' and 'make uninstall' work correctly.
This target is generally not run by end users.
Compilers and Options
=====================
Some systems require unusual options for compilation or linking that
the 'configure' script does not know about. Run './configure --help'
for details on some of the pertinent environment variables.
You can give 'configure' initial values for configuration parameters
by setting variables in the command line or in the environment. Here is
an example:
./configure CC=c99 CFLAGS=-g LIBS=-lposix
*Note Defining Variables::, for more details.
Compiling For Multiple Architectures
====================================
You can compile the package for more than one kind of computer at the
same time, by placing the object files for each architecture in their
own directory. To do this, you can use GNU 'make'. 'cd' to the
directory where you want the object files and executables to go and run
the 'configure' script. 'configure' automatically checks for the source
code in the directory that 'configure' is in and in '..'. This is known
as a "VPATH" build.
With a non-GNU 'make', it is safer to compile the package for one
architecture at a time in the source code directory. After you have
installed the package for one architecture, use 'make distclean' before
reconfiguring for another architecture.
On MacOS X 10.5 and later systems, you can create libraries and
executables that work on multiple system types--known as "fat" or
"universal" binaries--by specifying multiple '-arch' options to the
compiler but only a single '-arch' option to the preprocessor. Like
this:
./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
CPP="gcc -E" CXXCPP="g++ -E"
This is not guaranteed to produce working output in all cases, you
may have to build one architecture at a time and combine the results
using the 'lipo' tool if you have problems.
Installation Names
==================
By default, 'make install' installs the package's commands under
'/usr/local/bin', include files under '/usr/local/include', etc. You
can specify an installation prefix other than '/usr/local' by giving
'configure' the option '--prefix=PREFIX', where PREFIX must be an
absolute file name.
You can specify separate installation prefixes for
architecture-specific files and architecture-independent files. If you
pass the option '--exec-prefix=PREFIX' to 'configure', the package uses
PREFIX as the prefix for installing programs and libraries.
Documentation and other data files still use the regular prefix.
In addition, if you use an unusual directory layout you can give
options like '--bindir=DIR' to specify different values for particular
kinds of files. Run 'configure --help' for a list of the directories
you can set and what kinds of files go in them. In general, the default
for these options is expressed in terms of '${prefix}', so that
specifying just '--prefix' will affect all of the other directory
specifications that were not explicitly provided.
The most portable way to affect installation locations is to pass the
correct locations to 'configure'; however, many packages provide one or
both of the following shortcuts of passing variable assignments to the
'make install' command line to change installation locations without
having to reconfigure or recompile.
The first method involves providing an override variable for each
affected directory. For example, 'make install
prefix=/alternate/directory' will choose an alternate location for all
directory configuration variables that were expressed in terms of
'${prefix}'. Any directories that were specified during 'configure',
but not in terms of '${prefix}', must each be overridden at install time
for the entire installation to be relocated. The approach of makefile
variable overrides for each directory variable is required by the GNU
Coding Standards, and ideally causes no recompilation. However, some
platforms have known limitations with the semantics of shared libraries
that end up requiring recompilation when using this method, particularly
noticeable in packages that use GNU Libtool.
The second method involves providing the 'DESTDIR' variable. For
example, 'make install DESTDIR=/alternate/directory' will prepend
'/alternate/directory' before all installation names. The approach of
'DESTDIR' overrides is not required by the GNU Coding Standards, and
does not work on platforms that have drive letters. On the other hand,
it does better at avoiding recompilation issues, and works well even
when some directory options were not specified in terms of '${prefix}'
at 'configure' time.
Optional Features
=================
If the package supports it, you can cause programs to be installed
with an extra prefix or suffix on their names by giving 'configure' the
option '--program-prefix=PREFIX' or '--program-suffix=SUFFIX'.
Some packages pay attention to '--enable-FEATURE' options to
'configure', where FEATURE indicates an optional part of the package.
They may also pay attention to '--with-PACKAGE' options, where PACKAGE
is something like 'gnu-as' or 'x' (for the X Window System). The
'README' should mention any '--enable-' and '--with-' options that the
package recognizes.
For packages that use the X Window System, 'configure' can usually
find the X include and library files automatically, but if it doesn't,
you can use the 'configure' options '--x-includes=DIR' and
'--x-libraries=DIR' to specify their locations.
Some packages offer the ability to configure how verbose the
execution of 'make' will be. For these packages, running './configure
--enable-silent-rules' sets the default to minimal output, which can be
overridden with 'make V=1'; while running './configure
--disable-silent-rules' sets the default to verbose, which can be
overridden with 'make V=0'.
Particular systems
==================
On HP-UX, the default C compiler is not ANSI C compatible. If GNU CC
is not installed, it is recommended to use the following options in
order to use an ANSI C compiler:
./configure CC="cc -Ae -D_XOPEN_SOURCE=500"
and if that doesn't work, install pre-built binaries of GCC for HP-UX.
HP-UX 'make' updates targets which have the same time stamps as their
prerequisites, which makes it generally unusable when shipped generated
files such as 'configure' are involved. Use GNU 'make' instead.
On OSF/1 a.k.a. Tru64, some versions of the default C compiler cannot
parse its '<wchar.h>' header file. The option '-nodtk' can be used as a
workaround. If GNU CC is not installed, it is therefore recommended to
try
./configure CC="cc"
and if that doesn't work, try
./configure CC="cc -nodtk"
On Solaris, don't put '/usr/ucb' early in your 'PATH'. This
directory contains several dysfunctional programs; working variants of
these programs are available in '/usr/bin'. So, if you need '/usr/ucb'
in your 'PATH', put it _after_ '/usr/bin'.
On Haiku, software installed for all users goes in '/boot/common',
not '/usr/local'. It is recommended to use the following options:
./configure --prefix=/boot/common
Specifying the System Type
==========================
There may be some features 'configure' cannot figure out
automatically, but needs to determine by the type of machine the package
will run on. Usually, assuming the package is built to be run on the
_same_ architectures, 'configure' can figure that out, but if it prints
a message saying it cannot guess the machine type, give it the
'--build=TYPE' option. TYPE can either be a short name for the system
type, such as 'sun4', or a canonical name which has the form:
CPU-COMPANY-SYSTEM
where SYSTEM can have one of these forms:
OS
KERNEL-OS
See the file 'config.sub' for the possible values of each field. If
'config.sub' isn't included in this package, then this package doesn't
need to know the machine type.
If you are _building_ compiler tools for cross-compiling, you should
use the option '--target=TYPE' to select the type of system they will
produce code for.
If you want to _use_ a cross compiler, that generates code for a
platform different from the build platform, you should specify the
"host" platform (i.e., that on which the generated programs will
eventually be run) with '--host=TYPE'.
Sharing Defaults
================
If you want to set default values for 'configure' scripts to share,
you can create a site shell script called 'config.site' that gives
default values for variables like 'CC', 'cache_file', and 'prefix'.
'configure' looks for 'PREFIX/share/config.site' if it exists, then
'PREFIX/etc/config.site' if it exists. Or, you can set the
'CONFIG_SITE' environment variable to the location of the site script.
A warning: not all 'configure' scripts look for a site script.
Defining Variables
==================
Variables not defined in a site shell script can be set in the
environment passed to 'configure'. However, some packages may run
configure again during the build, and the customized values of these
variables may be lost. In order to avoid this problem, you should set
them in the 'configure' command line, using 'VAR=value'. For example:
./configure CC=/usr/local2/bin/gcc
causes the specified 'gcc' to be used as the C compiler (unless it is
overridden in the site shell script).
Unfortunately, this technique does not work for 'CONFIG_SHELL' due to an
Autoconf limitation. Until the limitation is lifted, you can use this
workaround:
CONFIG_SHELL=/bin/bash ./configure CONFIG_SHELL=/bin/bash
'configure' Invocation
======================
'configure' recognizes the following options to control how it
operates.
'--help'
'-h'
Print a summary of all of the options to 'configure', and exit.
'--help=short'
'--help=recursive'
Print a summary of the options unique to this package's
'configure', and exit. The 'short' variant lists options used only
in the top level, while the 'recursive' variant lists options also
present in any nested packages.
'--version'
'-V'
Print the version of Autoconf used to generate the 'configure'
script, and exit.
'--cache-file=FILE'
Enable the cache: use and save the results of the tests in FILE,
traditionally 'config.cache'. FILE defaults to '/dev/null' to
disable caching.
'--config-cache'
'-C'
Alias for '--cache-file=config.cache'.
'--quiet'
'--silent'
'-q'
Do not print messages saying which checks are being made. To
suppress all normal output, redirect it to '/dev/null' (any error
messages will still be shown).
'--srcdir=DIR'
Look for the package's source code in directory DIR. Usually
'configure' can determine that directory automatically.
'--prefix=DIR'
Use DIR as the installation prefix. *note Installation Names:: for
more details, including other options available for fine-tuning the
installation locations.
'--no-create'
'-n'
Run the configure checks, but stop before creating any output
files.
'configure' also accepts some other, not widely useful, options. Run
'configure --help' for more details.

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Makefile.am 100644
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SUBDIRS = src
#ACLOCAL_AMFLAGS = -I m4
#EXTRA_DIST = build-aux/config.rpath

0
NEWS 100644
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0
README 100644
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76
configure.ac 100644
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AC_INIT([pop-c], [0.1.0], [], [pop_c])
AC_REVISION([Revision 1])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIR([m4])
# We need automake
AM_INIT_AUTOMAKE([-Wall -Werror])
AM_PROG_AR
AC_CONFIG_SRCDIR([src/pop.c])
LT_INIT
# For debian systems, /usr as default
AC_PREFIX_DEFAULT([/usr])
# We need Gcc
AC_PROG_CC
# We need OBJC, for MAC
AC_PROG_OBJC
# Translate this program
#AM_GNU_GETTEXT_VERSION([0.19.3])
#AM_GNU_GETTEXT([external])
ALL_LINGUAS=""
AC_SUBST(ALL_LINGUAS)
AM_PROG_CC_C_O
# Revisar el host
AC_CANONICAL_HOST
case $host_os in
*mingw32* ) MINGW32=yes;;
* ) MINGW32=no;;
esac
case $host_os in
*cygwin* ) CYGWIN=yes;;
* ) CYGWIN=no;;
esac
case $host_os in
*linux* ) LINUX=yes;;
* ) LINUX=no;;
esac
case $host_os in
*darwin* ) MACOSX=yes;;
* ) MACOSX=no;;
esac
AM_CONDITIONAL(MINGW32, test x$MINGW32 = xyes)
AM_CONDITIONAL(LINUX, test x$LINUX = xyes)
AM_CONDITIONAL(MACOSX, test x$MACOSX = xyes)
# Check for pkg-config
#PKG_PROG_PKG_CONFIG
#OPENSSL_VERSION=0.9.8
#AC_MSG_CHECKING([if you have openssl installed on your system])
#PKG_CHECK_EXISTS([openssl >= $OPENSSL_VERSION], [AC_MSG_RESULT([yes])], [AC_MSG_FAILURE([openssl not found in your system])])
#PKG_CHECK_MODULES(OPENSSL, [openssl >= $OPENSSL_VERSION], [], [])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([
Makefile
src/Makefile
src/pop-c.pc
])
AC_OUTPUT

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src/Makefile.am 100644
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# Automake file for pop-c
lib_LTLIBRARIES = libpopc.la
libpopc_la_SOURCES = pop.c pop.h
#libpopc_la_CFLAGS = $(OPENSSL_CFLAGS)
#libpopc_la_LDFLAGS = $(OPENSSL_LIBS) -version-info 0:1:0 -no-undefined -export-symbols $(srcdir)/libpopc.sym
libpopc_la_LDFLAGS = -version-info 0:1:0 -no-undefined -export-symbols $(srcdir)/libpopc.sym
libpopc_la_DEPENDENCIES = libpopc.sym
libpopcdir = $(includedir)/libpop_c/pop_c
libpopc_HEADERS = pop.h
pkgconfigdir = $(libdir)/pkgconfig
dist_pkgconfig_DATA = pop-c.pc
EXTRA_DIST = libpopc.sym

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/*
* Base64 encoding/decoding (RFC1341)
* Copyright (c) 2005-2011, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "base64.h"
static const unsigned char base64_table[65] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/**
* base64_encode - Base64 encode
* @src: Data to be encoded
* @len: Length of the data to be encoded
* @out_len: Pointer to output length variable, or %NULL if not used
* Returns: Allocated buffer of out_len bytes of encoded data,
* or %NULL on failure
*
* Caller is responsible for freeing the returned buffer. Returned buffer is
* nul terminated to make it easier to use as a C string. The nul terminator is
* not included in out_len.
*/
unsigned char * base64_encode(const unsigned char *src, size_t len,
size_t *out_len)
{
unsigned char *out, *pos;
const unsigned char *end, *in;
size_t olen;
int line_len;
olen = len * 4 / 3 + 4; /* 3-byte blocks to 4-byte */
olen += olen / 72; /* line feeds */
olen++; /* nul termination */
if (olen < len)
return NULL; /* integer overflow */
out = (unsigned char *) malloc(sizeof (unsigned char) * olen);
if (out == NULL)
return NULL;
end = src + len;
in = src;
pos = out;
line_len = 0;
while (end - in >= 3) {
*pos++ = base64_table[in[0] >> 2];
*pos++ = base64_table[((in[0] & 0x03) << 4) | (in[1] >> 4)];
*pos++ = base64_table[((in[1] & 0x0f) << 2) | (in[2] >> 6)];
*pos++ = base64_table[in[2] & 0x3f];
in += 3;
line_len += 4;
if (line_len >= 72) {
*pos++ = 0;
line_len = 0;
}
}
if (end - in) {
*pos++ = base64_table[in[0] >> 2];
if (end - in == 1) {
*pos++ = base64_table[(in[0] & 0x03) << 4];
*pos++ = '=';
} else {
*pos++ = base64_table[((in[0] & 0x03) << 4) |
(in[1] >> 4)];
*pos++ = base64_table[(in[1] & 0x0f) << 2];
}
*pos++ = '=';
line_len += 4;
}
if (line_len)
*pos++ = 0;
*pos = '\0';
if (out_len)
*out_len = pos - out;
return out;
}
/**
* base64_decode - Base64 decode
* @src: Data to be decoded
* @len: Length of the data to be decoded
* @out_len: Pointer to output length variable
* Returns: Allocated buffer of out_len bytes of decoded data,
* or %NULL on failure
*
* Caller is responsible for freeing the returned buffer.
*/
unsigned char * base64_decode(const unsigned char *src, size_t len,
size_t *out_len)
{
unsigned char dtable[256], *out, *pos, block[4], tmp;
size_t i, count, olen;
int pad = 0;
memset (dtable, 0x80, 256);
for (i = 0; i < sizeof(base64_table) - 1; i++)
dtable[base64_table[i]] = (unsigned char) i;
dtable['='] = 0;
count = 0;
for (i = 0; i < len; i++) {
if (dtable[src[i]] != 0x80)
count++;
}
if (count == 0 || count % 4)
return NULL;
olen = count / 4 * 3;
pos = out = (unsigned char *) malloc (sizeof (unsigned char) * olen);
if (out == NULL)
return NULL;
count = 0;
for (i = 0; i < len; i++) {
tmp = dtable[src[i]];
if (tmp == 0x80)
continue;
if (src[i] == '=')
pad++;
block[count] = tmp;
count++;
if (count == 4) {
*pos++ = (block[0] << 2) | (block[1] >> 4);
*pos++ = (block[1] << 4) | (block[2] >> 2);
*pos++ = (block[2] << 6) | block[3];
count = 0;
if (pad) {
if (pad == 1)
pos--;
else if (pad == 2)
pos -= 2;
else {
/* Invalid padding */
free(out);
return NULL;
}
break;
}
}
}
*out_len = pos - out;
return out;
}

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#ifndef __BASE64_H__
#define __BASE64_H__
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
unsigned char * base64_encode(const unsigned char *src, size_t len, size_t *out_len);
#endif /* __BASE64_H__ */

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pop_session_create
pop_session_auth_login
pop_session_connect
pop_session_close_and_clean
pop_session_send_command
pop_session_send_close
pop_session_continue
pop_session_get_state
pop_session_get_poll
pop_session_get_socket
pop_session_get_last_code
pop_session_get_last_message
pop_session_free
pop_session_data_func

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prefix=@prefix@
exec_prefix=@exec_prefix@
libdir=@libdir@
includedir=@includedir@
Name: POP-C Library
Description: Client Library for doing async POP client commands
Version: @VERSION@
Libs: -L${libdir} -lpopc
#Requires.private: openssl >= 0.9.8
Cflags: -I${includedir}/libpop_c

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src/pop.c 100644
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/*
* pop.c
* This file is part of LibPOPc
*
* Copyright (C) 2022 - Félix Arreola Rodríguez
*
* LibPOPc 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.
*
* LibPOPc 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 LibPOPc; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <errno.h>
#include <ctype.h>
#include "pop.h"
#define POP_WANT_FLAGS_OR_POLL(var, flags, poll) \
do { \
if ((var & flags) == 0) { \
poll = flags; \
return POP_POLL; \
} \
} while (0)
enum {
POP_LINE_INVALID = 0,
POP_LINE_OK,
POP_LINE_ERR
};
enum {
POP_INTERNAL_FREE = 0,
POP_INTERNAL_WRITE,
POP_INTERNAL_READ,
};
struct _POPSession {
/* El socket de datos */
int sock;
/* Estado de la sessión en general */
int estado;
/* Estado interno, lectura, escritura */
int internal;
/* Variable que controla el poller */
int poll;
/* La conexión con el servidor */
struct sockaddr_storage server;
/* El buffer de lectura de la red */
char read_buffer[8192];
size_t read_count;
int ceof;
/* Bandera que me indica si el último comando que ejecutamos esperamos multi-lineas */
int waiting_multiline;
char *user;
char *passwd;
int last_code;
char last_cmd[8192];
char last_message[1024];
/* El stream que usaremos para recibir un correo */
FILE *data_stream;
/* Función para llamar cuando lea entre lineas */
POPDataFunc line_func;
void *line_func_data;
};
int _pop_session_internal_connect_cont (POPSession *session);
int _pop_session_internal_banner_code (POPSession *session);
int _pop_session_internal_send_helo (POPSession *session);
int _pop_session_internal_helo_code (POPSession *session);
int _pop_session_internal_start_auth_login (POPSession *session);
int _pop_session_internal_auth_login_code (POPSession *session);
int _pop_session_internal_send_user (POPSession *session);
int _pop_session_internal_user_code (POPSession *session);
int _pop_session_internal_send_pass (POPSession *session);
int _pop_session_internal_pass_code (POPSession *session);
int _pop_session_internal_send_cmd (POPSession *session);
int _pop_session_internal_cmd_code (POPSession *session);
int _pop_session_internal_send_close (POPSession *session);
int _pop_session_internal_close_code (POPSession *session);
int _pop_session_internal_send_data (POPSession *session);
int _pop_session_internal_data_code (POPSession *session);
int _pop_session_internal_data_write_finish (POPSession *session);
int _pop_session_internal_data_write (POPSession *session);
int pop_session_read_bytes (POPSession *session);
int pop_session_readline (POPSession *session, char *buffer, int max);
int _pop_session_validate_response_line (POPSession *session, char *buffer, int size);
POPSession *pop_session_create (void) {
POPSession *pop;
pop = (POPSession *) malloc (sizeof (POPSession));
if (pop == NULL) return NULL;
memset (pop, 0, sizeof (POPSession));
pop->sock = -1;
return pop;
}
void pop_session_free (POPSession *session) {
pop_session_close_and_clean (session);
free (session);
}
void pop_session_close_and_clean (POPSession *session) {
if (session->user != NULL) {
free (session->user);
session->user = NULL;
}
if (session->passwd != NULL) {
free (session->passwd);
session->passwd = NULL;
}
if (session->sock >= 0) {
close (session->sock);
session->sock = -1;
}
session->internal = POP_INTERNAL_FREE;
session->estado = POP_STATE_CLOSED;
}
// Arreglada
int pop_session_connect (POPSession *session, struct sockaddr *server, socklen_t addr_len) {
int c;
int res;
session->poll = POP_WANT_NONE;
c = socket (server->sa_family, SOCK_STREAM, 0);
if (c < 0) {
return POP_ERROR;
}
fcntl (c, F_SETFL, O_NONBLOCK);
session->estado = POP_STATE_TRYING_CONNECT;
memcpy (&session->server, server, addr_len);
res = connect (c, server, addr_len);
if (res < 0) {
if (errno == EINPROGRESS) {
session->sock = c;
session->poll = POP_WANT_POLL_OUT;
session->internal = POP_INTERNAL_WRITE;
session->estado = POP_STATE_TRYING_CONNECT;
return POP_POLL;
} else {
session->sock = -1;
close (c);
return POP_ERROR;
}
} else {
/* Conexión exitosa */
session->sock = c;
session->internal = POP_INTERNAL_READ;
session->estado = POP_STATE_BANNER;
session->read_count = 0;
return pop_session_continue (session, POP_WANT_POLL_IN);
}
}
// FIXME:
int pop_session_continue (POPSession *session, int what) {
char linea[8192];
size_t linea_size;
int res;
int e;
int use_short;
if (session->internal == POP_INTERNAL_FREE) {
return POP_ERROR;
}
if (session->internal == POP_INTERNAL_WRITE) {
POP_WANT_FLAGS_OR_POLL (what, POP_WANT_POLL_OUT, session->poll);
/* Se logró el evento esperado */
switch (session->estado) {
case POP_STATE_TRYING_CONNECT:
return _pop_session_internal_connect_cont (session);
case POP_STATE_AUTH_LOGIN_USER:
return _pop_session_internal_send_user (session);
case POP_STATE_AUTH_LOGIN_PASS:
return _pop_session_internal_send_pass (session);
case POP_STATE_CMD:
return _pop_session_internal_send_cmd (session);
// FIXME: Arreglar esto
case POP_STATE_CLOSING:
return _pop_session_internal_send_close (session);
}
} else if (session->internal == POP_INTERNAL_READ) {
POP_WANT_FLAGS_OR_POLL (what, POP_WANT_POLL_IN, session->poll);
pop_read_a_line_again:
/* Leer una linea */
linea_size = pop_session_readline (session, linea, sizeof (linea));
if (linea_size == POP_POLL) {
/* Si al intentar leer, no hay linea, revisar si podemos leer algunos bytes */
res = pop_session_read_bytes (session);
if (res == POP_ERROR) {
pop_session_close_and_clean (session);
return POP_ERROR;
} else if (res == POP_POLL) {
/* No hay bytes, hacer polling */
session->poll = POP_WANT_POLL_IN;
return POP_POLL;
} else if (session->ceof == 1) {
/* Cierre de la conexión, limpiar y cerrar */
if (session->estado == POP_STATE_CLOSING) {
pop_session_close_and_clean (session);
return POP_SUCCESS;
} else {
pop_session_close_and_clean (session);
return POP_ERROR;
}
}
/* Con los bytes restantes de la lectura previa, intentar leer la linea */
linea_size = pop_session_readline (session, linea, sizeof (linea));
}
if (session->estado == POP_STATE_DATA) {
/* Los datos no se validan como linea de respuesta */
if ((linea[0] == '.' && linea[1] == 0) ||
(linea[0] == '.' && linea[1] == '\n')) {
session->estado = POP_STATE_READY;
session->internal = POP_INTERNAL_FREE;
return POP_SUCCESS;
}
if (session->line_func != NULL) {
session->line_func (session, linea, session->line_func_data);
}
goto pop_read_a_line_again;
}
res = _pop_session_validate_response_line (session, linea, linea_size);
if (res == POP_LINE_INVALID) {
/* Esperaba una respuesta +OK o -ERR */
pop_session_close_and_clean (session);
return POP_ERROR;
}
/* Linea buena, guardar el estado y el mensaje de la linea */
if (res == POP_LINE_OK) {
strncpy (session->last_message, &linea[4], sizeof (session->last_message) - 1);
} else {
strncpy (session->last_message, &linea[5], sizeof (session->last_message) - 1);
}
e = strlen (session->last_message) - 1;
while (e > 0 && (session->last_message[e] == '\r' || session->last_message[e] == '\n')) {
session->last_message[e] = 0;
e--;
}
session->last_code = res;
/* Correr la función correcta para pasar al siguiente estado */
switch (session->estado) {
case POP_STATE_BANNER:
return _pop_session_internal_banner_code (session);
case POP_STATE_AUTH_LOGIN_USER:
return _pop_session_internal_user_code (session);
case POP_STATE_AUTH_LOGIN_PASS:
return _pop_session_internal_pass_code (session);
case POP_STATE_CMD:
return _pop_session_internal_cmd_code (session);
// FIXME: Arreglar esto
case POP_STATE_CLOSING:
return _pop_session_internal_close_code (session);
}
}
}
// Arreglada
int _pop_session_validate_response_line (POPSession *session, char *buffer, int size) {
int ok_or_err;
if (size < 3) {
return POP_LINE_INVALID;
}
ok_or_err = 0;
/* Puede ser un +OK o un -ERR */
if (strncmp ("+OK", buffer, 3) == 0) {
ok_or_err = 1;
} else if (size >= 4 && strncmp ("-ERR", buffer, 4) == 0) {
ok_or_err = 2;
}
if (ok_or_err == 0) {
return POP_LINE_INVALID;
} else if (ok_or_err == 1) {
return POP_LINE_OK;
} else {
return POP_LINE_ERR;
}
}
int _pop_session_internal_connect_cont (POPSession *session) {
int optval;
socklen_t optlen;
int res;
optval = -1;
optlen = sizeof (optval);
res = getsockopt (session->sock, SOL_SOCKET, SO_ERROR, &optval, &optlen);
if (res < 0) {
pop_session_close_and_clean (session);
return POP_ERROR;
}
if (optval != 0) {
pop_session_close_and_clean (session);
return POP_ERROR;
}
/* Pasamos a la lectura del banner */
session->internal = POP_INTERNAL_READ;
session->estado = POP_STATE_BANNER;
session->read_count = 0;
return pop_session_continue (session, POP_WANT_POLL_IN);
}
// Arreglada
int _pop_session_internal_banner_code (POPSession *session) {
if (session->last_code == POP_LINE_OK) {
session->internal = POP_INTERNAL_FREE;
session->estado = POP_STATE_READY_BEFORE_LOGIN;
return POP_SUCCESS;
} else {
pop_session_close_and_clean (session);
return POP_ERROR;
}
}
// Arreglada
int _pop_session_internal_start_auth_login (POPSession *session) {
int res, linea_size;
char *auth = "AUTH LOGIN\r\n";
linea_size = strlen (auth);
res = write (session->sock, auth, linea_size);
if (res < 0 && errno == EAGAIN) {
session->poll = POP_WANT_POLL_OUT;
session->internal = POP_INTERNAL_WRITE;
return POP_POLL;
} else if (res < linea_size) {
pop_session_close_and_clean (session);
return POP_ERROR;
}
/* Empezamos el AUTH LOGIN */
session->internal = POP_INTERNAL_READ;
return pop_session_continue (session, POP_WANT_POLL_IN);
}
// Arreglada
int _pop_session_internal_auth_login_code (POPSession *session) {
if (session->last_code == POP_LINE_OK) {
session->estado = POP_STATE_AUTH_LOGIN_USER;
session->internal = POP_INTERNAL_WRITE;
return pop_session_continue (session, POP_WANT_POLL_OUT);
} else if (session->last_code == POP_LINE_ERR) {
session->estado = POP_STATE_READY_BEFORE_LOGIN;
session->internal = POP_INTERNAL_FREE;
return POP_ERROR;
}
}
// Arreglada
int _pop_session_internal_send_user (POPSession *session) {
char linea[1024];
int res, linea_size;
linea_size = snprintf (linea, sizeof (linea), "USER %s\r\n", session->user);
res = write (session->sock, linea, linea_size);
if (res < 0 && errno == EAGAIN) {
session->poll = POP_WANT_POLL_OUT;
session->internal = POP_INTERNAL_WRITE;
return POP_POLL;
} else if (res < linea_size) {
/* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */
pop_session_close_and_clean (session);
return POP_ERROR;
}
/* Envio completo */
session->internal = POP_INTERNAL_READ;
return pop_session_continue (session, POP_WANT_POLL_IN);
}
// Arreglada
int _pop_session_internal_user_code (POPSession *session) {
if (session->last_code == POP_LINE_OK) {
session->estado = POP_STATE_AUTH_LOGIN_PASS;
session->internal = POP_INTERNAL_WRITE;
return pop_session_continue (session, POP_WANT_POLL_OUT);
} else if (session->last_code == POP_LINE_ERR) {
session->internal = POP_INTERNAL_FREE;
session->estado = POP_STATE_READY_BEFORE_LOGIN;
return POP_ERROR;
}
}
// Arreglada
int _pop_session_internal_send_pass (POPSession *session) {
char linea[1024];
int res, linea_size;
linea_size = snprintf (linea, sizeof (linea), "PASS %s\r\n", session->passwd);
res = write (session->sock, linea, linea_size);
if (res < 0 && errno == EAGAIN) {
session->poll = POP_WANT_POLL_OUT;
session->internal = POP_INTERNAL_WRITE;
return POP_POLL;
} else if (res < linea_size) {
/* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */
pop_session_close_and_clean (session);
return POP_ERROR;
}
/* Envio completo */
session->internal = POP_INTERNAL_READ;
return pop_session_continue (session, POP_WANT_POLL_IN);
}
// Arreglada
int _pop_session_internal_pass_code (POPSession *session) {
if (session->last_code == POP_LINE_OK) {
session->estado = POP_STATE_READY;
session->internal = POP_INTERNAL_FREE;
return POP_SUCCESS;
} else if (session->last_code == POP_LINE_ERR) {
session->estado = POP_STATE_READY_BEFORE_LOGIN;
session->internal = POP_INTERNAL_FREE;
return POP_ERROR;
}
}
// Arreglada
int _pop_session_internal_send_cmd (POPSession *session) {
int res, linea_size;
linea_size = strlen (session->last_cmd);
res = write (session->sock, session->last_cmd, linea_size);
if (res < 0 && errno == EAGAIN) {
session->poll = POP_WANT_POLL_OUT;
session->internal = POP_INTERNAL_WRITE;
return POP_POLL;
} else if (res < linea_size) {
/* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */
pop_session_close_and_clean (session);
return POP_ERROR;
}
/* Envio completo */
session->internal = POP_INTERNAL_READ;
return pop_session_continue (session, POP_WANT_POLL_IN);
}
// Arreglada
int _pop_session_internal_cmd_code (POPSession *session) {
if (session->waiting_multiline && session->last_code == POP_LINE_OK) {
/* Si estabamos esperando una rspuesta multilinea y obtuvimos +OK, pasar a otro estado */
session->estado = POP_STATE_DATA;
session->poll = POP_WANT_POLL_IN;
session->internal = POP_INTERNAL_READ;
return pop_session_continue (session, POP_WANT_POLL_IN);
}
/* En caso contrario, el comando ya terminó de ejecutarse, estamos listos para otro */
session->estado = POP_STATE_READY;
session->internal = POP_INTERNAL_FREE;
if (session->last_code == POP_LINE_OK) {
return POP_SUCCESS;
}
return POP_ERROR;
}
int _pop_session_internal_send_close (POPSession *session) {
char *linea;
int res, linea_size;
linea = "QUIT\r\n";
linea_size = strlen (linea);
res = write (session->sock, linea, linea_size);
if (res < 0 && errno == EAGAIN) {
session->poll = POP_WANT_POLL_OUT;
session->internal = POP_INTERNAL_WRITE;
return POP_POLL;
} else if (res < linea_size) {
/* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */
pop_session_close_and_clean (session);
return POP_ERROR;
}
/* Envio completo */
session->internal = POP_INTERNAL_READ;
return pop_session_continue (session, POP_WANT_POLL_IN);
}
int _pop_session_internal_close_code (POPSession *session) {
/* Realmente no importa si en el quit mandan una respuesta +OK o -Err, ya vamos de salida */
session->internal = POP_INTERNAL_FREE;
session->estado = POP_STATE_READY;
pop_session_close_and_clean (session);
return POP_SUCCESS;
}
int pop_session_read_bytes (POPSession *session) {
int res;
if (session->read_count >= sizeof (session->read_buffer)) {
return POP_ERROR;
}
/* Leer tantos bytes como tenga el buffer */
res = read (session->sock, &session->read_buffer[session->read_count], sizeof (session->read_buffer) - session->read_count);
if (res == 0) {
session->ceof = 1;
} else if (res < 0) {
if (errno == EINTR || errno == EAGAIN) {
return POP_POLL;
}
return POP_ERROR;
} else {
session->read_count += res;
}
return POP_SUCCESS;
}
int pop_session_readline (POPSession *session, char *buffer, int max) {
char *end;
int line_size = 0;
if (session->read_count > 0) {
/* Ya había otros bytes en el buffer, procesarlos para buscar el salto de linea aquí */
line_size = (max >= session->read_count) ? session->read_count : max - 1;
end = memccpy (buffer, session->read_buffer, '\n', line_size);
if (end != NULL) {
line_size = end - buffer;
}
buffer[line_size] = 0;
/* Consumir x bytes de la entrada */
if (line_size < session->read_count) {
memmove (session->read_buffer, &session->read_buffer[line_size], session->read_count - line_size);
session->read_count -= line_size;
} else {
session->read_buffer[0] = 0;
session->read_count = 0;
}
if (end != NULL) {
if (buffer[line_size - 2] == '\r') {
/* Quitar el \r */
buffer[line_size - 2] = '\n';
buffer[line_size - 1] = 0;
line_size--;
}
return line_size;
}
}
return POP_POLL;
}
int pop_session_get_state (POPSession *session) {
return session->estado;
}
int pop_session_auth_login (POPSession *session, const char *user, const char *passwd) {
if (session->estado != POP_STATE_READY_BEFORE_LOGIN || session->internal != POP_INTERNAL_FREE) {
return POP_ERROR;
}
/* Copiar el usuario y contraseña */
session->user = strdup (user);
if (passwd != NULL) {
session->passwd = strdup (passwd);
} else {
session->passwd = NULL;
}
session->estado = POP_STATE_AUTH_LOGIN_USER;
session->internal = POP_INTERNAL_WRITE;
return pop_session_continue (session, POP_WANT_POLL_OUT);
}
// Arreglada
int pop_session_send_command (POPSession *session, char *command, int multiline) {
int len;
/* TODO: Revisar aquí otros estados */
if (session->estado != POP_STATE_READY || session->internal != POP_INTERNAL_FREE) {
return POP_ERROR;
}
/* Sanitizar el comando y asegurarnos que contenga el \r\n */
len = strlen (command);
if (command[len - 2] == '\r' && command[len - 1] == '\n') {
if (len + 1 > sizeof (session->last_cmd)) {
return POP_ERROR;
}
strncpy (session->last_cmd, command, sizeof (session->last_cmd));
} else if (command[len - 1] == '\r') {
if (len + 2 > sizeof (session->last_cmd)) {
return POP_ERROR;
}
strncpy (session->last_cmd, command, sizeof (session->last_cmd));
session->last_cmd[len] = '\n';
session->last_cmd[len + 1] = 0;
} else {
if (len + 3 > sizeof (session->last_cmd)) {
return POP_ERROR;
}
strncpy (session->last_cmd, command, sizeof (session->last_cmd));
session->last_cmd[len] = '\r';
session->last_cmd[len + 1] = '\n';
session->last_cmd[len + 2] = 0;
}
session->estado = POP_STATE_CMD;
session->internal = POP_INTERNAL_WRITE;
session->waiting_multiline = multiline;
return pop_session_continue (session, POP_WANT_POLL_OUT);
}
int pop_session_send_close (POPSession *session) {
char *command;
int len;
if ((session->estado != POP_STATE_READY_BEFORE_LOGIN && session->estado != POP_STATE_READY) || session->internal != POP_INTERNAL_FREE) {
return POP_ERROR;
}
session->estado = POP_STATE_CLOSING;
session->internal = POP_INTERNAL_WRITE;
return pop_session_continue (session, POP_WANT_POLL_OUT);
}
int pop_session_get_socket (POPSession *session) {
return session->sock;
}
int pop_session_get_last_code (POPSession *session) {
return session->last_code;
}
char * pop_session_get_last_message (POPSession *session) {
return session->last_message;
}
void pop_session_data_func (POPSession *session, POPDataFunc func, void *data) {
session->line_func = func;
session->line_func_data = data;
}
int pop_session_get_poll (POPSession *session) {
return session->poll;
}

78
src/pop.h 100644
View File

@ -0,0 +1,78 @@
/*
* pop.h
* This file is part of LibPOPc
*
* Copyright (C) 2022 - Félix Arreola Rodríguez
*
* LibPOPc 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.
*
* LibPOPc 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 LibPOPc; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
#ifndef __POP_H__
#define __POP_H__
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#define POP_WANT_NONE 0x000
#define POP_WANT_POLL_IN 0x001
#define POP_WANT_POLL_OUT 0x002
enum {
POP_ERROR = -1,
POP_POLL = 0,
POP_SUCCESS = 1
};
enum {
POP_STATE_CLOSED = 0,
POP_STATE_TRYING_CONNECT,
POP_STATE_BANNER,
POP_STATE_READY_BEFORE_LOGIN,
POP_STATE_AUTH_LOGIN_USER,
POP_STATE_AUTH_LOGIN_PASS,
POP_STATE_READY,
POP_STATE_CMD,
POP_STATE_DATA,
POP_STATE_CLOSING,
};
typedef struct _POPSession POPSession;
typedef void (*POPDataFunc) (POPSession *session, const char *line, void *data);
POPSession *pop_session_create (void);
int pop_session_auth_login (POPSession *session, const char *user, const char *passwd);
int pop_session_connect (POPSession *session, struct sockaddr *server, socklen_t addr_len);
void pop_session_close_and_clean (POPSession *session);
int pop_session_send_command (POPSession *session, char *command, int multiline);
int pop_session_send_close (POPSession *session);
int pop_session_continue (POPSession *session, int what);
int pop_session_get_state (POPSession *session);
int pop_session_get_poll (POPSession *session);
int pop_session_get_socket (POPSession *session);
int pop_session_get_last_code (POPSession *session);
char * pop_session_get_last_message (POPSession *session);
void pop_session_free (POPSession *session);
void pop_session_data_func (POPSession *session, POPDataFunc func, void *data);
#endif /* __POP_H__ */