commit 83f4d50846ed568d8e078544e71f5a1188430fc6 Author: Félix Arreola Rodríguez Date: Fri Oct 28 21:49:16 2022 -0500 Importación de libsmtpc. diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..fcd2024 --- /dev/null +++ b/.gitignore @@ -0,0 +1,48 @@ +# http://www.gnu.org/software/automake +Makefile.in + +# http://www.gnu.org/software/autoconf +autom4te.cache +aclocal.m4 +compile +configure +depcomp +install-sh +missing + +build-aux/ + +config.h.in +config.h +Makefile +config.log +config.status +.deps +src/smtp-c.pc + +*.o +*.lo +*.la +src/.libs +stamp-h1 + +*~ + +m4 + +po/Makefile.in.in +po/Makevars.template +po/POTFILES +po/Rules-quot +po/boldquot.sed +po/en@boldquot.header +po/en@quot.header +po/insert-header.sin +po/quot.sed +po/remove-potcdate.sed +po/remove-potcdate.sin +po/stamp-po + +*.gmo +*.mo + 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. 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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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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..4470731 --- /dev/null +++ b/configure.ac @@ -0,0 +1,76 @@ +AC_INIT([smtp-c], [0.1.0], [], [smtp_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/smtp.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/smtp-c.pc +]) + +AC_OUTPUT diff --git a/src/Makefile.am b/src/Makefile.am new file mode 100644 index 0000000..7d40ab0 --- /dev/null +++ b/src/Makefile.am @@ -0,0 +1,19 @@ +# Automake file for smtp-c + +lib_LTLIBRARIES = libsmtpc.la + +libsmtpc_la_SOURCES = smtp.c smtp.h \ + base64.c base64.h + +#libsmtpc_la_CFLAGS = $(OPENSSL_CFLAGS) +#libsmtpc_la_LDFLAGS = $(OPENSSL_LIBS) -version-info 0:1:0 -no-undefined -export-symbols $(srcdir)/libsmtpc.sym +libsmtpc_la_LDFLAGS = -version-info 0:1:0 -no-undefined -export-symbols $(srcdir)/libsmtpc.sym +libsmtpc_la_DEPENDENCIES = libsmtpc.sym +libsmtpcdir = $(includedir)/libsmtp_c/smtp_c +libsmtpc_HEADERS = smtp.h + +pkgconfigdir = $(libdir)/pkgconfig +dist_pkgconfig_DATA = smtp-c.pc + +EXTRA_DIST = libsmtpc.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/libsmtpc.sym b/src/libsmtpc.sym new file mode 100644 index 0000000..8a29c92 --- /dev/null +++ b/src/libsmtpc.sym @@ -0,0 +1,15 @@ +smtp_session_create +smtp_session_auth_login +smtp_session_connect +smtp_session_close_and_clean +smtp_session_send_command +smtp_session_send_close +smtp_session_send_data +smtp_session_continue +smtp_session_get_state +smtp_session_get_poll +smtp_session_get_socket +smtp_session_get_last_code +smtp_session_get_last_message +smtp_session_free +smtp_session_multiline_func diff --git a/src/smtp-c.pc.in b/src/smtp-c.pc.in new file mode 100644 index 0000000..7983871 --- /dev/null +++ b/src/smtp-c.pc.in @@ -0,0 +1,11 @@ +prefix=@prefix@ +exec_prefix=@exec_prefix@ +libdir=@libdir@ +includedir=@includedir@ + +Name: SMTP-C Library +Description: Client Library for doing async SMTP client commands +Version: @VERSION@ +Libs: -L${libdir} -lsmtpc +#Requires.private: openssl >= 0.9.8 +Cflags: -I${includedir}/libsmtp_c diff --git a/src/smtp.c b/src/smtp.c new file mode 100644 index 0000000..fce3881 --- /dev/null +++ b/src/smtp.c @@ -0,0 +1,900 @@ +/* + * smtp.c + * This file is part of LibSMTPc + * + * Copyright (C) 2022 - Félix Arreola Rodríguez + * + * LibSMTPc 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. + * + * LibSMTPc 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 LibSMTPc; 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 "smtp.h" +#include "base64.h" + +#define SMTP_WANT_FLAGS_OR_POLL(var, flags, poll) \ + do { \ + if ((var & flags) == 0) { \ + poll = flags; \ + return SMTP_POLL; \ + } \ + } while (0) + +enum { + SMTP_LINE_INVALID = 0, + SMTP_LINE_CODE, + SMTP_LINE_CONTINUE +}; + +enum { + SMTP_INTERNAL_FREE = 0, + SMTP_INTERNAL_WRITE, + SMTP_INTERNAL_READ, +}; + +struct _SMTPSession { + /* 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; + + /* El último código de 3 digitos del último comando enviado */ + int last_code; + + /* El ehlo que vamos a utilizar */ + char helo_name[300]; + + /* Utilizado para saber si sigo buscando lineas de continuación de un comando multilineas */ + char cont_code[6]; + char *user; + char *passwd; + char last_cmd[8192]; + char last_message[1024]; + + /* El stream que usaremos para enviar el correo */ + FILE *data_stream; + + /* Función para llamar cuando lea entre lineas */ + SMTPLineFunc line_func; + void *line_func_data; +}; + +int _smtp_session_internal_connect_cont (SMTPSession *session); +int _smtp_session_internal_banner_code (SMTPSession *session); +int _smtp_session_internal_send_helo (SMTPSession *session); +int _smtp_session_internal_helo_code (SMTPSession *session); +int _smtp_session_internal_start_auth_login (SMTPSession *session); +int _smtp_session_internal_auth_login_code (SMTPSession *session); +int _smtp_session_internal_send_user (SMTPSession *session); +int _smtp_session_internal_user_code (SMTPSession *session); +int _smtp_session_internal_send_pass (SMTPSession *session); +int _smtp_session_internal_pass_code (SMTPSession *session); +int _smtp_session_internal_send_cmd (SMTPSession *session); +int _smtp_session_internal_cmd_code (SMTPSession *session); +int _smtp_session_internal_send_close (SMTPSession *session); +int _smtp_session_internal_close_code (SMTPSession *session); +int _smtp_session_internal_send_data (SMTPSession *session); +int _smtp_session_internal_data_code (SMTPSession *session); +int _smtp_session_internal_data_write_finish (SMTPSession *session); +int _smtp_session_internal_data_write (SMTPSession *session); + +int smtp_session_read_bytes (SMTPSession *session); +int smtp_session_readline (SMTPSession *session, char *buffer, int max); +int _smtp_session_validate_response_line (SMTPSession *session, char *buffer, int size); + +SMTPSession *smtp_session_create (void) { + SMTPSession *smtp; + + smtp = (SMTPSession *) malloc (sizeof (SMTPSession)); + + if (smtp == NULL) return NULL; + + memset (smtp, 0, sizeof (SMTPSession)); + + smtp->sock = -1; + + return smtp; +} + +void smtp_session_free (SMTPSession *session) { + smtp_session_close_and_clean (session); + + free (session); +} + +void smtp_session_close_and_clean (SMTPSession *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 = SMTP_INTERNAL_FREE; + session->estado = SMTP_STATE_CLOSED; +} + +int smtp_session_connect (SMTPSession *session, struct sockaddr *server, socklen_t addr_len, const char *helo_name) { + int c; + int res; + + session->poll = SMTP_WANT_NONE; + + c = socket (server->sa_family, SOCK_STREAM, 0); + + if (c < 0) { + return SMTP_ERROR; + } + + fcntl (c, F_SETFL, O_NONBLOCK); + + session->estado = SMTP_STATE_TRYING_CONNECT; + memcpy (&session->server, server, addr_len); + + strncpy (session->helo_name, helo_name, sizeof (session->helo_name)); + + res = connect (c, server, addr_len); + + if (res < 0) { + if (errno == EINPROGRESS) { + session->sock = c; + session->poll = SMTP_WANT_POLL_OUT; + session->internal = SMTP_INTERNAL_WRITE; + session->estado = SMTP_STATE_TRYING_CONNECT; + return SMTP_POLL; + } else { + session->sock = -1; + close (c); + + return SMTP_ERROR; + } + } else { + /* Conexión exitosa */ + session->sock = c; + session->internal = SMTP_INTERNAL_READ; + session->estado = SMTP_STATE_BANNER; + session->read_count = 0; + return smtp_session_continue (session, SMTP_WANT_POLL_IN); + } +} + +int smtp_session_continue (SMTPSession *session, int what) { + char linea[8192]; + size_t linea_size; + int res; + + if (session->internal == SMTP_INTERNAL_FREE) { + return SMTP_ERROR; + } + + if (session->internal == SMTP_INTERNAL_WRITE) { + SMTP_WANT_FLAGS_OR_POLL (what, SMTP_WANT_POLL_OUT, session->poll); + + /* Se logró el evento esperado */ + switch (session->estado) { + case SMTP_STATE_TRYING_CONNECT: + return _smtp_session_internal_connect_cont (session); + case SMTP_STATE_HELO: + return _smtp_session_internal_send_helo (session); + case SMTP_STATE_AUTH_LOGIN: + return _smtp_session_internal_start_auth_login (session); + case SMTP_STATE_AUTH_LOGIN_USER: + return _smtp_session_internal_send_user (session); + case SMTP_STATE_AUTH_LOGIN_PASS: + return _smtp_session_internal_send_pass (session); + case SMTP_STATE_CMD: + return _smtp_session_internal_send_cmd (session); + case SMTP_STATE_CLOSING: + return _smtp_session_internal_send_close (session); + case SMTP_STATE_DATA: + return _smtp_session_internal_send_data (session); + case SMTP_STATE_SENDING_DATA: + return _smtp_session_internal_data_write (session); + } + } else if (session->internal == SMTP_INTERNAL_READ) { + SMTP_WANT_FLAGS_OR_POLL (what, SMTP_WANT_POLL_IN, session->poll); + + /* Cuando sea una lectura, esperamos una linea con un código de respuesta, el que sea */ + +smtp_continue_read_line_again: + /* Leer una linea */ + linea_size = smtp_session_readline (session, linea, sizeof (linea)); + if (linea_size == SMTP_POLL) { + /* Si al intentar leer, no hay linea, revisar si podemos leer algunos bytes */ + res = smtp_session_read_bytes (session); + if (res == SMTP_ERROR) { + smtp_session_close_and_clean (session); + return SMTP_ERROR; + } else if (res == SMTP_POLL) { + /* No hay bytes, hacer polling */ + session->poll = SMTP_WANT_POLL_IN; + return SMTP_POLL; + } else if (session->ceof == 1) { + /* Cierre de la conexión, limpiar y cerrar */ + if (session->estado == SMTP_STATE_CLOSING) { + smtp_session_close_and_clean (session); + return SMTP_SUCCESS; + } else { + smtp_session_close_and_clean (session); + return SMTP_ERROR; + } + } + /* Con los bytes restantes de la lectura previa, intentar leer la linea */ + linea_size = smtp_session_readline (session, linea, sizeof (linea)); + } + + /* Procesar la linea */ + res = _smtp_session_validate_response_line (session, linea, linea_size); + + if (res == SMTP_LINE_INVALID) { + /* Esperaba una respuesta numérica */ + smtp_session_close_and_clean (session); + return SMTP_ERROR; + } else if (res == SMTP_LINE_CONTINUE) { + /* Llamarnos recursivamente para procesar la siguiente linea */ + goto smtp_continue_read_line_again; + } + /* Linea buena, guardar el estado y el mensaje de la linea */ + /* Estamos conectados */ + strncpy (session->last_message, &linea[4], sizeof (session->last_message) - 1); + session->last_code = ((linea[0] - '0') * 100) + ((linea[1] - '0') * 10) + (linea[2] - '0'); + /* Correr la función correcta para pasar al siguiente estado */ + switch (session->estado) { + case SMTP_STATE_BANNER: + return _smtp_session_internal_banner_code (session); + case SMTP_STATE_HELO: + return _smtp_session_internal_helo_code (session); + case SMTP_STATE_AUTH_LOGIN: + return _smtp_session_internal_auth_login_code (session); + case SMTP_STATE_AUTH_LOGIN_USER: + return _smtp_session_internal_user_code (session); + case SMTP_STATE_AUTH_LOGIN_PASS: + return _smtp_session_internal_pass_code (session); + case SMTP_STATE_CMD: + return _smtp_session_internal_cmd_code (session); + case SMTP_STATE_CLOSING: + return _smtp_session_internal_close_code (session); + case SMTP_STATE_DATA: + return _smtp_session_internal_data_code (session); + case SMTP_STATE_SENDING_DATA: + return _smtp_session_internal_data_write_finish (session); + } + } +} + +int _smtp_session_validate_response_line (SMTPSession *session, char *buffer, int size) { + if (size < 4 && session->cont_code[0] == 0) { + return SMTP_LINE_INVALID; + } + + if (session->cont_code[0] != 0) { + /* Estamos leyendo una continuación, si son digitos más espacio, es la linea final */ + if (size >= 4 && strncmp (session->cont_code, buffer, 3) == 0 && buffer[3] == ' ') { + session->cont_code[0] = 0; /* Ya no es continuación */ + return SMTP_LINE_CODE; + } else { + /* Lo que sea la linea, es continuación de lo anterior */ + + /* Si el usuario instaló una función de entre lineas, llamarla */ + if (session->line_func != NULL) { + session->line_func (session, buffer, session->line_func_data); + } + return SMTP_LINE_CONTINUE; + } + } else { + if (!isdigit (buffer[0]) || !isdigit (buffer[1]) || !isdigit (buffer[2])) { + return SMTP_LINE_INVALID; + } + + if (buffer[3] == '-') { + /* Empieza una continuación multi-linea */ + session->cont_code[0] = buffer[0]; + session->cont_code[1] = buffer[1]; + session->cont_code[2] = buffer[2]; + session->cont_code[3] = 0; + + /* Si el usuario instaló una función de entre lineas, llamarla */ + if (session->line_func != NULL) { + session->line_func (session, buffer, session->line_func_data); + } + + return SMTP_LINE_CONTINUE; + } else { + return SMTP_LINE_CODE; + } + } +} + +int _smtp_session_internal_connect_cont (SMTPSession *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) { + smtp_session_close_and_clean (session); + + return SMTP_ERROR; + } + + /* FIXME: Revisar el valor de optval */ + + /* Pasamos a la lectura del banner */ + session->internal = SMTP_INTERNAL_READ; + session->estado = SMTP_STATE_BANNER; + session->read_count = 0; + return smtp_session_continue (session, SMTP_WANT_POLL_IN); +} + +int _smtp_session_internal_banner_code (SMTPSession *session) { + if (session->last_code >= 200 && session->last_code < 300) { + session->internal = SMTP_INTERNAL_WRITE; + session->estado = SMTP_STATE_HELO; + return smtp_session_continue (session, SMTP_WANT_POLL_OUT); + } else { + smtp_session_close_and_clean (session); + return SMTP_ERROR; + } +} + +int _smtp_session_internal_send_helo (SMTPSession *session) { + char linea[1024]; + int res, linea_size; + + linea_size = snprintf (linea, sizeof (linea), "EHLO %s\r\n", session->helo_name); + res = write (session->sock, linea, linea_size); + + if (res < 0 && errno == EAGAIN) { + session->poll = SMTP_WANT_POLL_OUT; + session->internal = SMTP_INTERNAL_WRITE; + return SMTP_POLL; + } else if (res < linea_size) { + /* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */ + smtp_session_close_and_clean (session); + + return SMTP_ERROR; + } + /* Envio completo */ + session->internal = SMTP_INTERNAL_READ; + + return smtp_session_continue (session, SMTP_WANT_POLL_IN); +} + +int _smtp_session_internal_helo_code (SMTPSession *session) { + if (session->last_code >= 200 && session->last_code < 300) { + session->internal = SMTP_INTERNAL_FREE; + session->estado = SMTP_STATE_READY; + return SMTP_SUCCESS; + } else { + smtp_session_close_and_clean (session); + return SMTP_ERROR; + } +} + +int _smtp_session_internal_start_auth_login (SMTPSession *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 = SMTP_WANT_POLL_OUT; + session->internal = SMTP_INTERNAL_WRITE; + return SMTP_POLL; + } else if (res < linea_size) { + smtp_session_close_and_clean (session); + + return SMTP_ERROR; + } + + /* Empezamos el AUTH LOGIN */ + session->internal = SMTP_INTERNAL_READ; + + return smtp_session_continue (session, SMTP_WANT_POLL_IN); +} + +int _smtp_session_internal_auth_login_code (SMTPSession *session) { + if (session->last_code >= 300 && session->last_code < 400) { + session->estado = SMTP_STATE_AUTH_LOGIN_USER; + session->internal = SMTP_INTERNAL_WRITE; + return smtp_session_continue (session, SMTP_WANT_POLL_OUT); + } else if (session->last_code >= 500) { + session->estado = SMTP_STATE_READY; + session->internal = SMTP_INTERNAL_FREE; + return SMTP_ERROR; + } else { + smtp_session_close_and_clean (session); + return SMTP_ERROR; + } +} + +int _smtp_session_internal_send_user (SMTPSession *session) { + char linea[1024]; + int res, linea_size; + size_t b64_len; + char *b64; + + b64 = base64_encode (session->user, strlen (session->user), &b64_len); + linea_size = snprintf (linea, sizeof (linea), "%s\r\n", b64); + free (b64); + res = write (session->sock, linea, linea_size); + + if (res < 0 && errno == EAGAIN) { + session->poll = SMTP_WANT_POLL_OUT; + session->internal = SMTP_INTERNAL_WRITE; + return SMTP_POLL; + } else if (res < linea_size) { + /* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */ + smtp_session_close_and_clean (session); + + return SMTP_ERROR; + } + /* Envio completo */ + session->internal = SMTP_INTERNAL_READ; + + return smtp_session_continue (session, SMTP_WANT_POLL_IN); +} + +int _smtp_session_internal_user_code (SMTPSession *session) { + if (session->last_code >= 300 && session->last_code < 400) { + session->estado = SMTP_STATE_AUTH_LOGIN_PASS; + session->internal = SMTP_INTERNAL_WRITE; + return smtp_session_continue (session, SMTP_WANT_POLL_OUT); + } else if (session->last_code >= 200 && session->last_code < 300) { + session->internal = SMTP_INTERNAL_FREE; + session->estado = SMTP_STATE_READY; + + /* FIXME: activar la bandera de logueado */ + if (session->passwd) { + free (session->passwd); + session->passwd = NULL; + } + return SMTP_SUCCESS; + } else { + smtp_session_close_and_clean (session); + return SMTP_ERROR; + } +} + +int _smtp_session_internal_send_pass (SMTPSession *session) { + char linea[1024]; + int res, linea_size; + size_t b64_len; + char *b64; + + b64 = base64_encode (session->passwd, strlen (session->passwd), &b64_len); + linea_size = snprintf (linea, sizeof (linea), "%s\r\n", b64); + free (b64); + res = write (session->sock, linea, linea_size); + + if (res < 0 && errno == EAGAIN) { + session->poll = SMTP_WANT_POLL_OUT; + session->internal = SMTP_INTERNAL_WRITE; + return SMTP_POLL; + } else if (res < linea_size) { + /* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */ + smtp_session_close_and_clean (session); + + return SMTP_ERROR; + } + /* Envio completo */ + session->internal = SMTP_INTERNAL_READ; + + return smtp_session_continue (session, SMTP_WANT_POLL_IN); +} + +int _smtp_session_internal_pass_code (SMTPSession *session) { + session->estado = SMTP_STATE_READY; + session->internal = SMTP_INTERNAL_FREE; + if (session->last_code >= 200 && session->last_code < 300) { + /* FIXME: activar la bandera de logueado */ + return SMTP_SUCCESS; + } + return SMTP_ERROR; +} + +int _smtp_session_internal_send_cmd (SMTPSession *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 = SMTP_WANT_POLL_OUT; + session->internal = SMTP_INTERNAL_WRITE; + return SMTP_POLL; + } else if (res < linea_size) { + /* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */ + smtp_session_close_and_clean (session); + + return SMTP_ERROR; + } + /* Envio completo */ + session->internal = SMTP_INTERNAL_READ; + + return smtp_session_continue (session, SMTP_WANT_POLL_IN); +} + +int _smtp_session_internal_cmd_code (SMTPSession *session) { + session->estado = SMTP_STATE_READY; + session->internal = SMTP_INTERNAL_FREE; + + return SMTP_SUCCESS; +} + +int _smtp_session_internal_data_write_finish (SMTPSession *session) { + session->estado = SMTP_STATE_READY; + session->internal = SMTP_INTERNAL_FREE; + if (session->last_code >= 200 && session->last_code < 300) { + return SMTP_SUCCESS; + } + return SMTP_ERROR; +} + +int _smtp_session_internal_data_write (SMTPSession *session) { + int res; + char buffer[8192]; + size_t consumed; + long pos; + + if (session->data_stream == NULL) { + /* Si no hay flujo, nada que mandar. Cerrar canal de datos */ + + /* Pasar a leer el 200 del comando */ + session->internal = SMTP_INTERNAL_READ; + + return smtp_session_continue (session, SMTP_WANT_POLL_IN); + } + +smtp_data_write_again: + /* Primero hacer una lectura del flujo */ + pos = ftell (session->data_stream); + consumed = fread (buffer, 1, sizeof (buffer), session->data_stream); + if (consumed == 0) { + //if (feof (session->data_stream) || ferror (session->data_stream)) { + /* Fin de archivo, continuar con los comandos */ + session->data_stream = NULL; + + /* Pasar a leer el 200 del comando */ + session->internal = SMTP_INTERNAL_READ; + + return smtp_session_continue (session, SMTP_WANT_POLL_IN); + //} + } + + /* Tratar de escribir la cantidad leida */ + res = send (session->sock, buffer, consumed, 0); + if (res > 0) { + /* Reajustar el flujo de entrada */ + pos = pos + res; + + fseek (session->data_stream, pos, SEEK_SET); + + /* Reintentar enviar datos */ + goto smtp_data_write_again; + } else if (res <= 0) { + if (errno == EAGAIN || errno == EINTR) { + /* Bloquearía, reintentar después */ + fseek (session->data_stream, pos, SEEK_SET); + + session->poll = SMTP_WANT_POLL_OUT; + return SMTP_POLL; + } + + /* En otro error, se cerró la conexión de datos */ + session->data_stream = NULL; + session->internal = SMTP_INTERNAL_READ; + + return smtp_session_continue (session, SMTP_WANT_POLL_IN); + } +} + +int _smtp_session_internal_send_close (SMTPSession *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 = SMTP_WANT_POLL_OUT; + session->internal = SMTP_INTERNAL_WRITE; + return SMTP_POLL; + } else if (res < linea_size) { + /* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */ + smtp_session_close_and_clean (session); + + return SMTP_ERROR; + } + /* Envio completo */ + session->internal = SMTP_INTERNAL_READ; + + return smtp_session_continue (session, SMTP_WANT_POLL_IN); +} + +int _smtp_session_internal_close_code (SMTPSession *session) { + if (session->last_code >= 200 && session->last_code < 300) { + session->internal = SMTP_INTERNAL_FREE; + + /* Intencionalmente no cambiamos de estado para que nos llegue el cierre */ + return smtp_session_continue (session, SMTP_WANT_POLL_IN); + } else { + smtp_session_close_and_clean (session); + } + + return SMTP_SUCCESS; +} + +int _smtp_session_internal_send_data (SMTPSession *session) { + char *linea; + int res, linea_size; + + linea = "DATA\r\n"; + linea_size = strlen (linea); + res = write (session->sock, linea, linea_size); + + if (res < 0 && errno == EAGAIN) { + session->poll = SMTP_WANT_POLL_OUT; + session->internal = SMTP_INTERNAL_WRITE; + return SMTP_POLL; + } else if (res < linea_size) { + /* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */ + smtp_session_close_and_clean (session); + + return SMTP_ERROR; + } + /* Envio completo */ + session->internal = SMTP_INTERNAL_READ; + + return smtp_session_continue (session, SMTP_WANT_POLL_IN); +} + +int _smtp_session_internal_data_code (SMTPSession *session) { + int c; + int res; + + if (session->last_code >= 300 && session->last_code < 400) { + /* Avanzamos de estado */ + session->internal = SMTP_INTERNAL_WRITE; + session->estado = SMTP_STATE_SENDING_DATA; + + return smtp_session_continue (session, SMTP_WANT_POLL_OUT); + } else { + /* En el caso de un código de error, regresar */ + session->internal = SMTP_INTERNAL_FREE; + session->estado = SMTP_STATE_READY; + + return SMTP_ERROR; + } +} + +int smtp_session_read_bytes (SMTPSession *session) { + int res; + if (session->read_count >= sizeof (session->read_buffer)) { + return SMTP_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 SMTP_POLL; + } + return SMTP_ERROR; + } else { + session->read_count += res; + } + + return SMTP_SUCCESS; +} + +int smtp_session_readline (SMTPSession *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 SMTP_POLL; +} + +int smtp_session_get_state (SMTPSession *session) { + return session->estado; +} + +int smtp_session_auth_login (SMTPSession *session, const char *user, const char *passwd) { + if (session->estado != SMTP_STATE_READY || session->internal != SMTP_INTERNAL_FREE) { + return SMTP_ERROR; + } + + /* Copiar el usuario y contraseña */ + session->user = strdup (user); + if (passwd != NULL) { + session->passwd = strdup (passwd); + } else { + session->passwd = NULL; + } + + session->estado = SMTP_STATE_AUTH_LOGIN; + session->internal = SMTP_INTERNAL_WRITE; + return smtp_session_continue (session, SMTP_WANT_POLL_OUT); +} + +int smtp_session_send_command (SMTPSession *session, char *command) { + int len; + + /* TODO: Revisar aquí otros estados */ + if (session->estado != SMTP_STATE_READY || session->internal != SMTP_INTERNAL_FREE) { + return SMTP_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 SMTP_ERROR; + } + strncpy (session->last_cmd, command, sizeof (session->last_cmd)); + } else if (command[len - 1] == '\r') { + if (len + 2 > sizeof (session->last_cmd)) { + return SMTP_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 SMTP_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 = SMTP_STATE_CMD; + session->internal = SMTP_INTERNAL_WRITE; + + return smtp_session_continue (session, SMTP_WANT_POLL_OUT); +} + +int smtp_session_send_close (SMTPSession *session) { + char *command; + int len; + + if (session->estado != SMTP_STATE_READY || session->internal != SMTP_INTERNAL_FREE) { + return SMTP_ERROR; + } + + session->estado = SMTP_STATE_CLOSING; + session->internal = SMTP_INTERNAL_WRITE; + + return smtp_session_continue (session, SMTP_WANT_POLL_OUT); +} + +int smtp_session_send_data (SMTPSession *session, FILE *stream) { + char *command; + int len; + + if (session->estado != SMTP_STATE_READY || session->internal != SMTP_INTERNAL_FREE) { + return SMTP_ERROR; + } + + session->estado = SMTP_STATE_DATA; + session->internal = SMTP_INTERNAL_WRITE; + session->data_stream = stream; + + return smtp_session_continue (session, SMTP_WANT_POLL_OUT); +} + +int smtp_session_get_socket (SMTPSession *session) { + return session->sock; +} + +int smtp_session_get_last_code (SMTPSession *session) { + return session->last_code; +} + +char * smtp_session_get_last_message (SMTPSession *session) { + return session->last_message; +} + +void smtp_session_multiline_func (SMTPSession *session, SMTPLineFunc func, void *data) { + session->line_func = func; + session->line_func_data = data; +} + +int smtp_session_get_poll (SMTPSession *session) { + return session->poll; +} + diff --git a/src/smtp.h b/src/smtp.h new file mode 100644 index 0000000..c9bef3f --- /dev/null +++ b/src/smtp.h @@ -0,0 +1,81 @@ +/* + * smtp.h + * This file is part of LibSMTPc + * + * Copyright (C) 2022 - Félix Arreola Rodríguez + * + * LibSMTPc 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. + * + * LibSMTPc 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 LibSMTPc; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, + * Boston, MA 02110-1301 USA + */ + +#ifndef __SMTP_H__ +#define __SMTP_H__ + +#include +#include +#include +#include +#include + +#define SMTP_WANT_NONE 0x000 +#define SMTP_WANT_POLL_IN 0x001 +#define SMTP_WANT_POLL_OUT 0x002 + +enum { + SMTP_ERROR = -1, + SMTP_POLL = 0, + SMTP_SUCCESS = 1 +}; + +enum { + SMTP_STATE_CLOSED = 0, + SMTP_STATE_TRYING_CONNECT, + SMTP_STATE_BANNER, + SMTP_STATE_HELO, + SMTP_STATE_READY, + SMTP_STATE_AUTH_LOGIN, + SMTP_STATE_AUTH_LOGIN_USER, + SMTP_STATE_AUTH_LOGIN_PASS, + SMTP_STATE_CMD, + SMTP_STATE_DATA, + SMTP_STATE_SENDING_DATA, + + SMTP_STATE_CLOSING, +}; + +typedef struct _SMTPSession SMTPSession; + +typedef void (*SMTPLineFunc) (SMTPSession *session, const char *line, void *data); + +SMTPSession *smtp_session_create (void); +int smtp_session_auth_login (SMTPSession *session, const char *user, const char *passwd); +int smtp_session_connect (SMTPSession *session, struct sockaddr *server, socklen_t addr_len, const char *helo_name); +void smtp_session_close_and_clean (SMTPSession *session); +int smtp_session_send_command (SMTPSession *session, char *command); +int smtp_session_send_close (SMTPSession *session); +int smtp_session_send_data (SMTPSession *session, FILE *stream); + +int smtp_session_continue (SMTPSession *session, int what); +int smtp_session_get_state (SMTPSession *session); +int smtp_session_get_poll (SMTPSession *session); +int smtp_session_get_socket (SMTPSession *session); +int smtp_session_get_last_code (SMTPSession *session); +char * smtp_session_get_last_message (SMTPSession *session); +void smtp_session_free (SMTPSession *session); + +void smtp_session_multiline_func (SMTPSession *session, SMTPLineFunc func, void *data); + +#endif /* __SMTP_H__ */ +