commit 4e6cbe0acb77e71139ce6e65c93e8cc9424eaca7 Author: Félix Arreola Rodríguez Date: Sat Aug 27 20:57:32 2022 -0500 Importacion de libftpc. diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..c8cb33a --- /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/ftp-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. 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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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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..e71b27d --- /dev/null +++ b/configure.ac @@ -0,0 +1,76 @@ +AC_INIT([ftp-c], [0.1.0], [], [ftp_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/ftp.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/ftp-c.pc +]) + +AC_OUTPUT diff --git a/src/Makefile.am b/src/Makefile.am new file mode 100644 index 0000000..371016e --- /dev/null +++ b/src/Makefile.am @@ -0,0 +1,18 @@ +# Automake file for ftp-c + +lib_LTLIBRARIES = libftpc.la + +libftpc_la_SOURCES = ftp.c ftp.h + +#libftpc_la_CFLAGS = $(OPENSSL_CFLAGS) +#libftpc_la_LDFLAGS = $(OPENSSL_LIBS) -version-info 0:1:0 -no-undefined -export-symbols $(srcdir)/libftpc.sym +libftpc_la_LDFLAGS = -version-info 0:1:0 -no-undefined -export-symbols $(srcdir)/libftpc.sym +libftpc_la_DEPENDENCIES = libftpc.sym +libftpcdir = $(includedir)/libftp_c/ftp_c +libftpc_HEADERS = ftp.h + +pkgconfigdir = $(libdir)/pkgconfig +dist_pkgconfig_DATA = ftp-c.pc + +EXTRA_DIST = libftpc.sym + diff --git a/src/ftp-c.pc.in b/src/ftp-c.pc.in new file mode 100644 index 0000000..c298e31 --- /dev/null +++ b/src/ftp-c.pc.in @@ -0,0 +1,11 @@ +prefix=@prefix@ +exec_prefix=@exec_prefix@ +libdir=@libdir@ +includedir=@includedir@ + +Name: FTP-C Library +Description: Client Library for doing async FTP client commands +Version: @VERSION@ +Libs: -L${libdir} -lftpc +#Requires.private: openssl >= 0.9.8 +Cflags: -I${includedir}/libftp_c diff --git a/src/ftp-private.h b/src/ftp-private.h new file mode 100644 index 0000000..0602c30 --- /dev/null +++ b/src/ftp-private.h @@ -0,0 +1,29 @@ +/* + * ftp-private.h + * This file is part of ftp-client + * + * Copyright (C) 2022 - Félix Arreola Rodriguez + * + * ftp-client 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. + * + * ftp-client 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 ftp-client; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, + * Boston, MA 02110-1301 USA + */ + +#ifndef __FTP_PRIVATE_H__ +#define __FTP_PRIVATE_H__ + + + +#endif /* __FTP_PRIVATE_H__ */ + diff --git a/src/ftp.c b/src/ftp.c new file mode 100644 index 0000000..9259999 --- /dev/null +++ b/src/ftp.c @@ -0,0 +1,1015 @@ +#include +#include +#include + +#include +#include + +#include +#include +#include + +#include +#include + +#include "ftp.h" + +#define FTP_WANT_FLAGS_OR_POLL(var, flags, poll) \ + do { \ + if ((var & flags) == 0) { \ + poll = flags; \ + return FTP_POLL; \ + } \ + } while (0) + +enum { + FTP_LINE_INVALID = 0, + FTP_LINE_CODE, + FTP_LINE_CONTINUE +}; + +enum { + FTP_INTERNAL_FREE = 0, + FTP_INTERNAL_WRITE, + FTP_INTERNAL_READ, + + FTP_INTERNAL_DATA_WRITE, + FTP_INTERNAL_DATA_READ +}; + +struct _FTPSession { + /* El socket de control */ + int csock; + + /* El socket de datos, si está abierto */ + int dsock; + + /* Estado de la sessión en general */ + int estado; + + /* Estado interno, lectura, escritura, sobre control o datos */ + int internal; + + /* Controla si cuando enviamos un comando debemos vigilar el canal de datos */ + int command_data_dir; + + /* 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; + + /* Variable que controla el poller */ + int poll; + + /* El último código de 3 digitos del último comando enviado */ + int last_code; + + /* 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 o recibir datos */ + FILE *data_stream; + + /* Función para llamar cuando lea entre lineas */ + FTPLineFunc line_func; + void *line_func_data; +}; + +int ftp_session_read_bytes (FTPSession *session); +int ftp_session_readline (FTPSession *session, char *buffer, int max); + +int _ftp_session_internal_connect_cont (FTPSession *session); +int _ftp_session_internal_banner_cont (FTPSession *session); +int _ftp_session_internal_send_user (FTPSession *session); +int _ftp_session_internal_user_code (FTPSession *session); +int _ftp_session_internal_send_pass (FTPSession *session); +int _ftp_session_internal_pass_code (FTPSession *session); +int _ftp_session_internal_send_cmd (FTPSession *session); +int _ftp_session_internal_cmd_code (FTPSession *session); +int _ftp_session_internal_send_close (FTPSession *session); +int _ftp_session_internal_close_code (FTPSession *session); +int _ftp_session_internal_send_pasv (FTPSession *session); +int _ftp_session_internal_pasv_code (FTPSession *session); +int _ftp_session_internal_data_connect_cont (FTPSession *session); +int _ftp_session_internal_cmd_data_read (FTPSession *session); +int _ftp_session_internal_cmd_data_write (FTPSession *session); + +FTPSession *ftp_session_create (void) { + FTPSession *ftp; + + ftp = (FTPSession *) malloc (sizeof (FTPSession)); + + if (ftp == NULL) return NULL; + + memset (ftp, 0, sizeof (FTPSession)); + + ftp->csock = -1; + ftp->dsock = -1; + + return ftp; +} + +void ftp_session_free (FTPSession *session) { + ftp_session_close_and_clean (session); + + free (session); +} + +void ftp_session_close_and_clean (FTPSession *session) { + if (session->user != NULL) { + free (session->user); + session->user = NULL; + } + + if (session->passwd != NULL) { + free (session->passwd); + session->passwd = NULL; + } + + if (session->csock >= 0) { + close (session->csock); + session->csock = -1; + } + + if (session->dsock >= 0) { + close (session->dsock); + session->dsock = -1; + } + + session->internal = FTP_INTERNAL_FREE; + session->estado = FTP_STATE_CLOSED; +} + +static int _ftp_session_validate_response_line (FTPSession *session, char *buffer, int size) { + if (size < 4 && session->cont_code[0] == 0) { + return FTP_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 FTP_LINE_CODE; + } else { + /* Lo que sea la linea, es continuación de lo anterior */ + + /* Si el usuario instaló una función de leer entre lineas, llamarla */ + if (session->line_func != NULL) { + session->line_func (session, buffer, session->line_func_data); + } + return FTP_LINE_CONTINUE; + } + } else { + if (!isdigit (buffer[0]) || !isdigit (buffer[1]) || !isdigit (buffer[2])) { + return FTP_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 leer entre lineas, llamarla */ + if (session->line_func != NULL) { + session->line_func (session, buffer, session->line_func_data); + } + + return FTP_LINE_CONTINUE; + } else { + return FTP_LINE_CODE; + } + } +} + +int ftp_session_connect (FTPSession *session, struct sockaddr *server, socklen_t addr_len) { + int c; + int res; + + session->poll = FTP_WANT_NONE; + + c = socket (server->sa_family, SOCK_STREAM, 0); + + if (c < 0) { + return FTP_ERROR; + } + + fcntl (c, F_SETFL, O_NONBLOCK); + + session->estado = FTP_STATE_TRYING_CONNECT; + memcpy (&session->server, server, addr_len); + + res = connect (c, server, addr_len); + + if (res < 0) { + if (errno == EINPROGRESS) { + session->csock = c; + session->poll = FTP_WANT_POLL_OUT; + session->internal = FTP_INTERNAL_WRITE; + session->estado = FTP_STATE_TRYING_CONNECT; + return FTP_POLL; + } else { + session->csock = -1; + close (c); + + return FTP_ERROR; + } + } else { + /* Conexión exitosa */ + session->csock = c; + session->internal = FTP_INTERNAL_READ; + session->estado = FTP_STATE_TRYING_CONNECT; + session->read_count = 0; + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); + } +} + +int ftp_session_async_continue (FTPSession *session, int what) { + char linea[8192]; + size_t linea_size; + int res; + + if (session->internal == FTP_INTERNAL_FREE) { + return FTP_ERROR; + } + + if (session->internal == FTP_INTERNAL_DATA_READ) { + FTP_WANT_FLAGS_OR_POLL (what, FTP_WANT_POLL_DATA_IN, session->poll); + + switch (session->estado) { + case FTP_STATE_CMD: + return _ftp_session_internal_cmd_data_read (session); + } + } else if (session->internal == FTP_INTERNAL_DATA_WRITE) { + FTP_WANT_FLAGS_OR_POLL (what, FTP_WANT_POLL_DATA_OUT, session->poll); + + switch (session->estado) { + case FTP_STATE_PASV: + return _ftp_session_internal_data_connect_cont (session); + case FTP_STATE_CMD: + return _ftp_session_internal_cmd_data_write (session); + } + } else if (session->internal == FTP_INTERNAL_WRITE) { + FTP_WANT_FLAGS_OR_POLL (what, FTP_WANT_POLL_OUT, session->poll); + + /* Se logró el evento esperado */ + switch (session->estado) { + case FTP_STATE_TRYING_CONNECT: + return _ftp_session_internal_connect_cont (session); + case FTP_STATE_LOGIN_USER: + return _ftp_session_internal_send_user (session); + case FTP_STATE_LOGIN_PASS: + return _ftp_session_internal_send_pass (session); + case FTP_STATE_CMD: + return _ftp_session_internal_send_cmd (session); + case FTP_STATE_CLOSING: + return _ftp_session_internal_send_close (session); + case FTP_STATE_PASV: + return _ftp_session_internal_send_pasv (session); + } + } else if (session->internal == FTP_INTERNAL_READ) { + FTP_WANT_FLAGS_OR_POLL (what, FTP_WANT_POLL_IN, session->poll); + + /* Cuando sea una lectura, esperamos una linea con un código de respuesta, el que sea */ + +ftp_continue_read_line_again: + /* Leer una linea */ + linea_size = ftp_session_readline (session, linea, sizeof (linea)); + if (linea_size == FTP_POLL) { + /* Si al intentar leer, no hay linea, revisar si podemos leer algunos bytes */ + res = ftp_session_read_bytes (session); + if (res == FTP_ERROR) { + ftp_session_close_and_clean (session); + return FTP_ERROR; + } else if (res == FTP_POLL) { + /* No hay bytes, hacer polling */ + session->poll = FTP_WANT_POLL_IN; + return FTP_POLL; + } else if (session->ceof == 1) { + /* Cierre de la conexión, limpiar y cerrar */ + if (session->estado == FTP_STATE_CLOSING) { + ftp_session_close_and_clean (session); + return FTP_SUCCESS; + } else { + ftp_session_close_and_clean (session); + return FTP_ERROR; + } + } + /* Con los bytes restantes de la lectura previa, intentar leer la linea */ + linea_size = ftp_session_readline (session, linea, sizeof (linea)); + } + + /* Procesar la linea */ + res = _ftp_session_validate_response_line (session, linea, linea_size); + + if (res == FTP_LINE_INVALID) { + /* Esperaba una respuesta numérica */ + ftp_session_close_and_clean (session); + return FTP_ERROR; + } else if (res == FTP_LINE_CONTINUE) { + /* Llamarnos recursivamente para procesar la siguiente linea */ + goto ftp_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 FTP_STATE_TRYING_CONNECT: + return _ftp_session_internal_banner_cont (session); + case FTP_STATE_LOGIN_USER: + return _ftp_session_internal_user_code (session); + case FTP_STATE_LOGIN_PASS: + return _ftp_session_internal_pass_code (session); + case FTP_STATE_CMD: + return _ftp_session_internal_cmd_code (session); + case FTP_STATE_CLOSING: + return _ftp_session_internal_close_code (session); + case FTP_STATE_PASV: + return _ftp_session_internal_pasv_code (session); + } + } +} + +int _ftp_session_internal_connect_cont (FTPSession *session) { + int optval; + socklen_t optlen; + int res; + + optval = -1; + + optlen = sizeof (optval); + + res = getsockopt (session->csock, SOL_SOCKET, SO_ERROR, &optval, &optlen); + + if (res < 0) { + ftp_session_close_and_clean (session); + + return FTP_ERROR; + } + + /* FIXME: Revisar el valor de optval */ + + /* Pasamos a la lectura del banner */ + session->internal = FTP_INTERNAL_READ; + session->estado = FTP_STATE_TRYING_CONNECT; + session->read_count = 0; + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); +} + +int _ftp_session_internal_banner_cont (FTPSession *session) { + if (session->last_code >= 200 && session->last_code < 300) { + session->internal = FTP_INTERNAL_FREE; + session->estado = FTP_STATE_CONNECTED; + return FTP_SUCCESS; + } else { + ftp_session_close_and_clean (session); + return FTP_ERROR; + } +} + +int _ftp_session_internal_send_user (FTPSession *session) { + char linea[1024]; + int res, linea_size; + + linea_size = snprintf (linea, sizeof (linea), "USER %s\r\n", session->user); + res = write (session->csock, linea, linea_size); + + if (res < 0 && errno == EAGAIN) { + session->poll = FTP_WANT_POLL_OUT; + session->internal = FTP_INTERNAL_WRITE; + return FTP_POLL; + } else if (res < linea_size) { + /* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */ + ftp_session_close_and_clean (session); + + return FTP_ERROR; + } + /* Envio completo */ + session->internal = FTP_INTERNAL_READ; + + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); +} + +int _ftp_session_internal_user_code (FTPSession *session) { + if (session->last_code >= 300 && session->last_code < 400) { + session->estado = FTP_STATE_LOGIN_PASS; + session->internal = FTP_INTERNAL_WRITE; + return ftp_session_async_continue (session, FTP_WANT_POLL_OUT); + } else if (session->last_code >= 200 && session->last_code < 300) { + session->internal = FTP_INTERNAL_FREE; + session->estado = FTP_STATE_LOGGED; + + if (session->passwd) { + free (session->passwd); + session->passwd = NULL; + } + return FTP_SUCCESS; + } else { + ftp_session_close_and_clean (session); + return FTP_ERROR; + } +} + +int _ftp_session_internal_send_pass (FTPSession *session) { + char linea[1024]; + int res, linea_size; + + linea_size = snprintf (linea, sizeof (linea), "PASS %s\r\n", session->passwd); + res = write (session->csock, linea, linea_size); + + if (res < 0 && errno == EAGAIN) { + session->poll = FTP_WANT_POLL_OUT; + session->internal = FTP_INTERNAL_WRITE; + return FTP_POLL; + } else if (res < linea_size) { + /* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */ + ftp_session_close_and_clean (session); + + return FTP_ERROR; + } + /* Envio completo */ + session->internal = FTP_INTERNAL_READ; + + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); +} + +int _ftp_session_internal_pass_code (FTPSession *session) { + if (session->last_code >= 200 && session->last_code < 300) { + session->estado = FTP_STATE_LOGGED; + session->internal = FTP_INTERNAL_FREE; + } else { + session->estado = FTP_STATE_CONNECTED; + session->internal = FTP_INTERNAL_FREE; + } + return FTP_SUCCESS; +} + +int _ftp_session_internal_send_cmd (FTPSession *session) { + int res, linea_size; + + linea_size = strlen (session->last_cmd); + res = write (session->csock, session->last_cmd, linea_size); + + if (res < 0 && errno == EAGAIN) { + session->poll = FTP_WANT_POLL_OUT; + session->internal = FTP_INTERNAL_WRITE; + return FTP_POLL; + } else if (res < linea_size) { + /* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */ + ftp_session_close_and_clean (session); + + return FTP_ERROR; + } + /* Envio completo */ + session->internal = FTP_INTERNAL_READ; + + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); +} + +int _ftp_session_internal_cmd_code (FTPSession *session) { + if (session->command_data_dir != FTP_DATA_NONE && session->dsock != -1) { + if (session->last_code >= 100 && session->last_code < 200) { + /* Como pidieron leer/escribir datos en el canal de datos, pasar a internal_data read/write */ + if (session->command_data_dir == FTP_DATA_READ) { + session->internal = FTP_INTERNAL_DATA_READ; + + return ftp_session_async_continue (session, FTP_WANT_POLL_DATA_IN); + } else { + session->internal = FTP_INTERNAL_DATA_WRITE; + + return ftp_session_async_continue (session, FTP_WANT_POLL_DATA_OUT); + } + } else { + /* Error es error */ + session->estado = FTP_STATE_LOGGED; + session->internal = FTP_INTERNAL_FREE; + } + } else if (session->last_code >= 100 && session->last_code < 200) { + /* Si no pidieron leer datos, entonces, un código 100 significa esperar por un 200 */ + session->internal = FTP_INTERNAL_READ; + + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); + } else { + session->estado = FTP_STATE_LOGGED; + session->internal = FTP_INTERNAL_FREE; + } + + return FTP_SUCCESS; +} + +int _ftp_session_internal_cmd_data_read (FTPSession *session) { + /* Leer datos de socket de datos y enviar al flujo que nos pasaron */ + int res; + char buffer[8192]; + /* Tratar de sacar tantos datos como nos sea posible hasta golpear un EOF o error */ + do { + res = recv (session->dsock, buffer, sizeof (buffer), 0); + + if (res == 0) { + /* Fin de archivo sobre el socket de datos */ + close (session->dsock); + session->dsock = -1; + session->data_stream = NULL; + + /* Pasar a leer el 200 del comando */ + session->internal = FTP_INTERNAL_READ; + + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); + } else if (res < 0) { + if (errno == EAGAIN || errno == EINTR) { + /* Se acabaron los datos por leer, continuar */ + session->poll = FTP_WANT_POLL_DATA_IN; + return FTP_POLL; + } + + close (session->dsock); + session->dsock = -1; + session->data_stream = NULL; + + /* ¿error en el canal de datos? ¿Qué hago? */ + session->internal = FTP_INTERNAL_READ; + + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); + } + + if (session->data_stream != NULL) { + fwrite (buffer, 1, res, session->data_stream); + } + } while (1); +} + +int _ftp_session_internal_cmd_data_write (FTPSession *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 */ + close (session->dsock); + session->dsock = -1; + + /* Pasar a leer el 200 del comando */ + session->internal = FTP_INTERNAL_READ; + + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); + } + +ftp_cmd_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 */ + close (session->dsock); + session->dsock = -1; + session->data_stream = NULL; + + /* Pasar a leer el 200 del comando */ + session->internal = FTP_INTERNAL_READ; + + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); + //} + } + + /* Tratar de escribir la cantidad leida */ + res = send (session->dsock, 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 ftp_cmd_data_write_again; + } else if (res <= 0) { + if (errno == EAGAIN || errno == EINTR) { + /* Bloquearía, reintentar después */ + fseek (session->data_stream, pos, SEEK_SET); + + session->poll = FTP_WANT_POLL_DATA_OUT; + return FTP_POLL; + } + + /* En otro error, se cerró la conexión de datos */ + close (session->dsock); + session->dsock = -1; + session->data_stream = NULL; + + session->internal = FTP_INTERNAL_READ; + + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); + } +} + +int _ftp_session_internal_send_close (FTPSession *session) { + char *linea; + int res, linea_size; + + linea = "QUIT\r\n"; + linea_size = strlen (linea); + res = write (session->csock, linea, linea_size); + + if (res < 0 && errno == EAGAIN) { + session->poll = FTP_WANT_POLL_OUT; + session->internal = FTP_INTERNAL_WRITE; + return FTP_POLL; + } else if (res < linea_size) { + /* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */ + ftp_session_close_and_clean (session); + + return FTP_ERROR; + } + /* Envio completo */ + session->internal = FTP_INTERNAL_READ; + + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); +} + +int _ftp_session_internal_close_code (FTPSession *session) { + if (session->last_code >= 200 && session->last_code < 300) { + session->internal = FTP_INTERNAL_FREE; + + /* Intencionalmente no cambiamos de estado para que nos llegue el cierre */ + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); + } else { + ftp_session_close_and_clean (session); + } + + return FTP_SUCCESS; +} + +int _ftp_session_internal_send_pasv (FTPSession *session) { + char *linea; + int res, linea_size; + + /* Elegir el tipo correcto de EPSV o PASV basado en el tipo de socket */ + if (session->server.ss_family == AF_INET) { + linea = "PASV\r\n"; + } else { + linea = "EPSV\r\n"; + } + linea_size = strlen (linea); + res = write (session->csock, linea, linea_size); + + if (res < 0 && errno == EAGAIN) { + session->poll = FTP_WANT_POLL_OUT; + session->internal = FTP_INTERNAL_WRITE; + return FTP_POLL; + } else if (res < linea_size) { + /* Enviamos menos de lo que deberíamos o error, TODO: revisar este caso */ + ftp_session_close_and_clean (session); + + return FTP_ERROR; + } + /* Envio completo */ + session->internal = FTP_INTERNAL_READ; + + return ftp_session_async_continue (session, FTP_WANT_POLL_IN); +} + +static socklen_t _ftp_parse_port_pasv (int family, char *linea, struct sockaddr *dest) { + char *str; + unsigned char v[6]; + long n; + struct sockaddr_in *ipv4; + struct sockaddr_in6 *ipv6; + + str = strchr (linea, '('); + + if (str == NULL) { + return 0; + } + + str++; + + if (family == AF_INET) { + ipv4 = (struct sockaddr_in *) dest; + ipv4->sin_family = AF_INET; + n = sscanf (str, "%hhu,%hhu,%hhu,%hhu,%hhu,%hhu", &v[2], &v[3], &v[4], &v[5], &v[0], &v[1]); + + if (n < 6) { + return 0; + } + if (v[2] != 0 || v[3] != 0 || v[4] != 0 || v[5] != 0) { + ipv4->sin_addr.s_addr = htonl ((v[2] << 24) | (v[3] << 16) | (v[4] << 8) | v[5]); + } + ipv4->sin_port = htons ((v[0] << 8) | v[1]); + + return sizeof (struct sockaddr_in); + } else if (family == AF_INET6) { + ipv6 = (struct sockaddr_in6 *) dest; + ipv6->sin6_family = AF_INET6; + + v[0] = sscanf (str, "|||%ld", &n); + + if (v[0] < 1) { + return 0; + } + + ipv6->sin6_port = htons (n); + + return sizeof (struct sockaddr_in6); + } + + return 0; +} + +int _ftp_session_internal_pasv_code (FTPSession *session) { + int c; + struct sockaddr_storage pasv_addr; + socklen_t len; + int res; + + if (session->last_code >= 200 && session->last_code < 300) { + if (session->server.ss_family == AF_INET) { + memcpy (&pasv_addr, &session->server, sizeof (struct sockaddr_in)); + } else if (session->server.ss_family == AF_INET6) { + memcpy (&pasv_addr, &session->server, sizeof (struct sockaddr_in6)); + } + + len = _ftp_parse_port_pasv (session->server.ss_family, session->last_message, (struct sockaddr *) &pasv_addr); + + if (len == 0) { + /* Falló el pasivo, regresar a logueado */ + session->internal = FTP_INTERNAL_FREE; + session->estado = FTP_STATE_LOGGED; + + return FTP_ERROR; + } + + /* Parsear el puerto desde el mensaje recibido */ + c = socket (pasv_addr.ss_family, SOCK_STREAM, 0); + if (c < 0) { + session->internal = FTP_INTERNAL_FREE; + session->estado = FTP_STATE_LOGGED; + return FTP_ERROR; + } + + fcntl (c, F_SETFL, O_NONBLOCK); + + res = connect (c, (struct sockaddr *) &pasv_addr, len); + + if (res < 0) { + if (errno == EINPROGRESS) { + session->dsock = c; + session->poll = FTP_WANT_POLL_DATA_OUT; + session->internal = FTP_INTERNAL_DATA_WRITE; + return FTP_POLL; + } else { + session->dsock = -1; + close (c); + + session->internal = FTP_INTERNAL_FREE; + session->estado = FTP_STATE_LOGGED; + return FTP_ERROR; + } + } else { + /* Conexión exitosa */ + session->dsock = c; + session->internal = FTP_INTERNAL_FREE; + session->estado = FTP_STATE_LOGGED; + session->read_count = 0; + return FTP_SUCCESS; + } + } else { + /* En el caso de un pasivo con un código de error, simplemente regresar al estado original */ + session->internal = FTP_INTERNAL_FREE; + session->estado = FTP_STATE_LOGGED; + + return FTP_ERROR; + } + + return FTP_SUCCESS; +} + +int _ftp_session_internal_data_connect_cont (FTPSession *session) { + int optval; + socklen_t optlen; + int res; + + optval = -1; + + optlen = sizeof (optval); + + res = getsockopt (session->dsock, SOL_SOCKET, SO_ERROR, &optval, &optlen); + + if (res < 0) { + close (session->dsock); + session->dsock = -1; + + return FTP_ERROR; + } + + if (optval != 0) { + close (session->dsock); + session->dsock = -1; + + return FTP_ERROR; + } + + /* Tenemos socket para data */ + session->internal = FTP_INTERNAL_FREE; + session->estado = FTP_STATE_LOGGED; + return FTP_SUCCESS; +} + +int ftp_session_read_bytes (FTPSession *session) { + int res; + if (session->read_count >= sizeof (session->read_buffer)) { + return FTP_ERROR; + } + + /* Leer tantos bytes como tenga el buffer */ + res = read (session->csock, &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 FTP_POLL; + } + return FTP_ERROR; + } else { + session->read_count += res; + } + + return FTP_SUCCESS; +} + +int ftp_session_readline (FTPSession *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 FTP_POLL; +} + +int ftp_session_get_state (FTPSession *session) { + return session->estado; +} + +/* Las funciones públicas */ +int ftp_session_login (FTPSession *session, const char *user, const char *passwd) { + if (session->estado != FTP_STATE_CONNECTED || session->internal != FTP_INTERNAL_FREE) { + return FTP_ERROR; + } + + /* Copiar el usuario y contraseña */ + session->user = strdup (user); + if (passwd != NULL) { + session->passwd = strdup (passwd); + } else { + session->passwd = NULL; + } + + session->estado = FTP_STATE_LOGIN_USER; + session->internal = FTP_INTERNAL_WRITE; + return ftp_session_async_continue (session, FTP_WANT_POLL_OUT); +} + +int ftp_session_send_command (FTPSession *session, char *command, int data_dir) { + int len; + + if (session->estado != FTP_STATE_LOGGED || session->internal != FTP_INTERNAL_FREE) { + return FTP_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 FTP_ERROR; + } + strncpy (session->last_cmd, command, sizeof (session->last_cmd)); + } else if (command[len - 1] == '\r') { + if (len + 2 > sizeof (session->last_cmd)) { + return FTP_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 FTP_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 = FTP_STATE_CMD; + session->internal = FTP_INTERNAL_WRITE; + session->command_data_dir = data_dir; + + return ftp_session_async_continue (session, FTP_WANT_POLL_OUT); +} + +int ftp_session_send_close (FTPSession *session) { + char *command; + int len; + + if (session->estado != FTP_STATE_LOGGED && session->estado != FTP_STATE_CONNECTED) { + return FTP_ERROR; + } + + if (session->internal != FTP_INTERNAL_FREE) { + return FTP_ERROR; + } + + session->estado = FTP_STATE_CLOSING; + session->internal = FTP_INTERNAL_WRITE; + + return ftp_session_async_continue (session, FTP_WANT_POLL_OUT); +} + +int ftp_session_request_pasv (FTPSession *session, FILE *stream) { + char *command; + int len; + + if (session->estado != FTP_STATE_LOGGED) { + return FTP_ERROR; + } + + if (session->internal != FTP_INTERNAL_FREE) { + return FTP_ERROR; + } + + session->estado = FTP_STATE_PASV; + session->internal = FTP_INTERNAL_WRITE; + session->data_stream = stream; + + return ftp_session_async_continue (session, FTP_WANT_POLL_OUT); +} + +int ftp_session_get_control_socket (FTPSession *session) { + return session->csock; +} + +int ftp_session_get_data_socket (FTPSession *session) { + return session->dsock; +} + +int ftp_session_get_last_code (FTPSession *session) { + return session->last_code; +} + +char * ftp_session_get_last_message (FTPSession *session) { + return session->last_message; +} + +void ftp_session_set_multiline_func (FTPSession *session, FTPLineFunc func, void *data) { + session->line_func = func; + session->line_func_data = data; +} + +int ftp_session_get_poll (FTPSession *session) { + return session->poll; +} + diff --git a/src/ftp.h b/src/ftp.h new file mode 100644 index 0000000..ed24378 --- /dev/null +++ b/src/ftp.h @@ -0,0 +1,63 @@ +#ifndef __FTP_H__ +#define __FTP_H__ + +#include +#include +#include +#include +#include + +#define FTP_WANT_NONE 0x000 +#define FTP_WANT_POLL_IN 0x001 +#define FTP_WANT_POLL_OUT 0x002 +#define FTP_WANT_POLL_DATA_IN 0x004 +#define FTP_WANT_POLL_DATA_OUT 0x008 + +enum { + FTP_ERROR = -1, + FTP_POLL = 0, + FTP_SUCCESS = 1 +}; + +enum { + FTP_DATA_NONE = 0, + FTP_DATA_READ, + FTP_DATA_WRITE +}; + +enum { + FTP_STATE_CLOSED = 0, + FTP_STATE_TRYING_CONNECT, + FTP_STATE_CONNECTED, + FTP_STATE_LOGIN_USER, + FTP_STATE_LOGIN_PASS, + FTP_STATE_LOGGED, + FTP_STATE_CMD, + FTP_STATE_PASV, + FTP_STATE_CLOSING +}; + +typedef struct _FTPSession FTPSession; + +FTPSession *ftp_session_create (void); + +typedef void (*FTPLineFunc) (FTPSession *session, const char *line, void *data); +int ftp_session_connect (FTPSession *session, struct sockaddr *server, socklen_t addr_len); +int ftp_session_login (FTPSession *session, const char *user, const char *passwd); +int ftp_session_send_command (FTPSession *session, char *command, int data_dir); +int ftp_session_send_close (FTPSession *session); +int ftp_session_request_pasv (FTPSession *session, FILE *stream); +void ftp_session_close_and_clean (FTPSession *session); + +int ftp_session_async_continue (FTPSession *session, int what); +int ftp_session_get_state (FTPSession *session); +int ftp_session_get_poll (FTPSession *session); +int ftp_session_get_control_socket (FTPSession *session); +int ftp_session_get_data_socket (FTPSession *session); +int ftp_session_get_last_code (FTPSession *session); +char * ftp_session_get_last_message (FTPSession *session); +void ftp_session_free (FTPSession *session); + +void ftp_session_set_multiline_func (FTPSession *session, FTPLineFunc func, void *data); + +#endif /* __FTP_H__ */ diff --git a/src/libftpc.sym b/src/libftpc.sym new file mode 100644 index 0000000..36de9c8 --- /dev/null +++ b/src/libftpc.sym @@ -0,0 +1,16 @@ +ftp_session_create +ftp_session_connect +ftp_session_login +ftp_session_send_command +ftp_session_send_close +ftp_session_request_pasv +ftp_session_close_and_clean +ftp_session_async_continue +ftp_session_get_state +ftp_session_get_poll +ftp_session_get_control_socket +ftp_session_get_data_socket +ftp_session_get_last_code +ftp_session_get_last_message +ftp_session_free +ftp_session_set_multiline_func