From 9b412a07228cf3dafdc44601f85fa2eb56a5c916 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?F=C3=A9lix=20Arreola=20Rodr=C3=ADguez?= Date: Sun, 26 Feb 2023 20:42:51 -0600 Subject: [PATCH] =?UTF-8?q?Importaci=C3=B3n=20de=20la=20libpopc.?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- AUTHORS | 0 COPYING | 674 ++++++++++++++++++++++++++++++++++++++++++++ ChangeLog | 0 INSTALL | 368 ++++++++++++++++++++++++ Makefile.am | 6 + NEWS | 0 README | 0 configure.ac | 76 +++++ src/Makefile.am | 18 ++ src/base64.c | 156 ++++++++++ src/base64.h | 11 + src/libpopc.sym | 14 + src/pop-c.pc.in | 11 + src/pop.c | 735 ++++++++++++++++++++++++++++++++++++++++++++++++ src/pop.h | 78 +++++ 15 files changed, 2147 insertions(+) create mode 100644 AUTHORS create mode 100644 COPYING create mode 100644 ChangeLog create mode 100644 INSTALL create mode 100644 Makefile.am create mode 100644 NEWS create mode 100644 README create mode 100644 configure.ac create mode 100644 src/Makefile.am create mode 100644 src/base64.c create mode 100644 src/base64.h create mode 100644 src/libpopc.sym create mode 100644 src/pop-c.pc.in create mode 100644 src/pop.c create mode 100644 src/pop.h diff --git a/AUTHORS b/AUTHORS new file mode 100644 index 0000000..e69de29 diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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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 Lesser General +Public License instead of this License. But first, please read +. diff --git a/ChangeLog b/ChangeLog new file mode 100644 index 0000000..e69de29 diff --git a/INSTALL b/INSTALL new file mode 100644 index 0000000..8865734 --- /dev/null +++ b/INSTALL @@ -0,0 +1,368 @@ +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. 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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. 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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. 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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). 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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 '' 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. 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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. diff --git a/Makefile.am b/Makefile.am new file mode 100644 index 0000000..44861e4 --- /dev/null +++ b/Makefile.am @@ -0,0 +1,6 @@ +SUBDIRS = src + +#ACLOCAL_AMFLAGS = -I m4 + +#EXTRA_DIST = build-aux/config.rpath + diff --git a/NEWS b/NEWS new file mode 100644 index 0000000..e69de29 diff --git a/README b/README new file mode 100644 index 0000000..e69de29 diff --git a/configure.ac b/configure.ac new file mode 100644 index 0000000..03e5cbd --- /dev/null +++ b/configure.ac @@ -0,0 +1,76 @@ +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 diff --git a/src/Makefile.am b/src/Makefile.am new file mode 100644 index 0000000..e496428 --- /dev/null +++ b/src/Makefile.am @@ -0,0 +1,18 @@ +# 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 + diff --git a/src/base64.c b/src/base64.c new file mode 100644 index 0000000..add45d0 --- /dev/null +++ b/src/base64.c @@ -0,0 +1,156 @@ +/* + * Base64 encoding/decoding (RFC1341) + * Copyright (c) 2005-2011, Jouni Malinen + * + * This software may be distributed under the terms of the BSD license. + * See README for more details. + */ + +#include +#include +#include + +#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; +} diff --git a/src/base64.h b/src/base64.h new file mode 100644 index 0000000..c4d0132 --- /dev/null +++ b/src/base64.h @@ -0,0 +1,11 @@ +#ifndef __BASE64_H__ +#define __BASE64_H__ + +#include +#include +#include + +unsigned char * base64_encode(const unsigned char *src, size_t len, size_t *out_len); + +#endif /* __BASE64_H__ */ + diff --git a/src/libpopc.sym b/src/libpopc.sym new file mode 100644 index 0000000..4fd1793 --- /dev/null +++ b/src/libpopc.sym @@ -0,0 +1,14 @@ +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 diff --git a/src/pop-c.pc.in b/src/pop-c.pc.in new file mode 100644 index 0000000..a0a7a3c --- /dev/null +++ b/src/pop-c.pc.in @@ -0,0 +1,11 @@ +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 diff --git a/src/pop.c b/src/pop.c new file mode 100644 index 0000000..6607f55 --- /dev/null +++ b/src/pop.c @@ -0,0 +1,735 @@ +/* + * 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 +#include +#include + +#include +#include + +#include +#include +#include + +#include +#include + +#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; +} + diff --git a/src/pop.h b/src/pop.h new file mode 100644 index 0000000..ed62685 --- /dev/null +++ b/src/pop.h @@ -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 +#include +#include +#include +#include + +#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__ */ +