Autor
Voy a explicar una duda existencial para los que tenemos el modem Amigo CA80U/CA85UR/etc (Distribuido en Argentina y España por los ISP como Modem Generico).
El titorial esta orientado a TODAS las distrubuciones Linux, por lo tanto, no se especifica como instalar paquetes (Se obvia, ante dudas, postear).
INDICE
1- Dependencias
2- Firmware
3- Creando la Interfaz
4- Configurando PPPoe
5- Lanzamos la conexión
6- Automatizacion
1- Dependencias
A) Asegurarnos de tener USB support seleccionado.
B) Asegurarnos de tener las siguientes librerias instaladas y soportes, caso contrario, descargarlas e instalarlas para nuentras correspondiente distribucion.
-ATM
-PPPoE
-Classical IP ATM
-Multi-Protocol over ATM (MPOA)
-RFC 1483/2684 Bridged protocols
-LAN Emulation (LANE)
-br2684ctl
2- Firmware
El que no quiera hacerlo por si mismo, ACA tienen el Firmware extraido y pasen al punto 3- Creando la Interfaz del tutorial.
Tenemos que extraer nuestro correspondiente Firmware para los drivers de modem.
A) Nececitamos el archivo CnxEtU.sys que contiente el Firmware.
Se encuentra en la carpeta WAN de nuestro CD de instalacion con los drivers de Modem o bien podemos descargarlo de ACA.
B) Ya tenemos el CnxEtU.sys con el Firmware dentro.
Ahora nececitamos extraerlo, lo vamos a hacer mediante un script.
Complilamos el siguiente script:
cxacru-fw.c
Citar
/*****************************************************************************
* cxacru-fw - utility to extract firmware for the USB ADSL modems based on
* Conexant AccessRunner chipset, from the Conexant driver for
* Windows(R)
*
* Copyright (C) 2005 Roman Kagan (rkagan % mail ! ru)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
****************************************************************************/
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <error.h>
#include <argp.h>
#include <stdint.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <endian.h>
#include <byteswap.h>
#if __BYTE_ORDER == __BIG_ENDIAN
static inline uint16_t le16_to_cpup(uint16_t *x) {return bswap_16(*x);}
static inline uint32_t le32_to_cpup(uint32_t *x) {return bswap_32(*x);}
#else
static inline uint16_t le16_to_cpup(uint16_t *x) {return *x;}
static inline uint32_t le32_to_cpup(uint32_t *x) {return *x;}
#endif
uint8_t *findfw(uint8_t *buf, int len, int *fwlen)
{
const static uint8_t fwstart[] = { /* ARM LE asm */
0x1c, 0x24, 0x9f, 0xe5, /* e59f241c ldr r2, [pc, #0x41c] */
0x00, 0x10, 0xa0, 0xe3, /* e3a01000 mov r1, #0x0 */
0x00, 0x10, 0x82, 0xe5, /* e5821000 str r1, [r2] */
0x22, 0x00, 0x00, 0xeb, /* eb000022 bl 0x9c */
};
const static uint8_t bpstart[] = {
0x78, 0x20, 0x9f, 0xe5, /* e59f2078 ldr r2, [pc, #0x78] */
0x01, 0x10, 0xa0, 0xe3, /* e3a01001 mov r1, #0x1 */
0x00, 0x10, 0x82, 0xe5, /* e5821000 str r1, [r2] */
0x70, 0x20, 0x9f, 0xe5, /* e59f2070 ldr r2, [pc, #0x70] */
};
uint8_t *fw, *bp, *nt_header, *sect_header;
uint32_t tmp;
uint16_t nsect;
uint32_t dataoff, datalen;
*fwlen = 0;
/* IMAGE_DOS_HEADER size and .Signature */
if (len < 0x40 || memcmp(buf, "MZ", 2)) {
error(0, 0, "file is not a DOS executable");
return NULL;
}
/* IMAGE_NT_HEADERS size and .Signature */
tmp = le32_to_cpup((uint32_t *) (buf + 0x3c));
nt_header = buf + tmp;
if (len < tmp + 0x18 || memcmp(nt_header, "PE\0\0", 4)) {
error(0, 0, "file is not a portable executable (PE)");
return NULL;
}
/* IMAGE_NT_HEADERS.FileHeader.NumberOfSections */
nsect = le16_to_cpup((uint16_t *) (nt_header + 0x04 + 0x2));
/* IMAGE_NT_HEADERS.FileHeader.SizeOfOptionalHeader */
tmp = le16_to_cpup((uint16_t *) (nt_header + 0x04 + 0x10));
sect_header = nt_header + 0x18 + tmp;
for (; nsect; nsect--, sect_header += 0x28) {
if (sect_header + 0x28 > buf + len) {
error(0, 0, "file header corrupted");
return NULL;
}
if (!memcmp(sect_header, ".data", 5))
break;
}
if (!nsect) {
error(0, 0, "`.data' section not found");
return NULL;
}
/* IMAGE_SECTION_HEADER.SizeOfRawData */
datalen = le32_to_cpup((uint32_t *) (sect_header + 0x10));
/* IMAGE_SECTION_HEADER.PointerToRawData */
dataoff = le32_to_cpup((uint32_t *) (sect_header + 0x14));
if (dataoff + datalen > len) {
error(0, 0, "`.data' section extends beyond end of file");
return NULL;
}
/* find the starting sequence of the firmware image */
fw = (uint8_t *) memmem(buf + dataoff, datalen, fwstart, sizeof(fwstart));
if (!fw) {
error(0, 0, "firmware start sequence not found");
return NULL;
}
*fwlen = datalen - (fw - (buf + dataoff));
/* find the starting sequence of the boot ROM patch, if present */
bp = (uint8_t *) memmem(fw, *fwlen, bpstart, sizeof(bpstart));
if (bp)
*fwlen = bp - fw;
return fw;
}
const char * argp_program_version = "002";
const char * argp_program_bug_address =
"<accessrunner-general at lists dot sourceforge dot net>";
const static char args_doc[] = "INFILE OUTFILE";
const static char doc[] =
"Firmware extractor for Conexant AccessRunner ADSL USB modems\n"
"INFILE - Windows driver file containing firmware (usually CnxEtU.sys)\n"
"OUTFILE - firmware image (usually cxacru-fw.bin)";
struct args {
char *infile;
char *outfile;
};
static error_t parse_opts(int key, char *arg, struct argp_state *state)
{
struct args *args = state->input;
switch (key) {
case ARGP_KEY_ARG:
switch (state->arg_num) {
case 0:
args->infile = arg;
break;
case 1:
args->outfile = arg;
break;
default:
argp_usage (state);
}
break;
case ARGP_KEY_END:
if (state->arg_num < 2)
argp_usage (state);
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
static struct argp argp = {0, parse_opts, args_doc, doc};
int main(int argc, char **argv)
{
int ret, fd;
struct args args;
struct stat instat;
uint8_t *buf, *fw;
int len, fwlen;
argp_parse(&argp, argc, argv, 0, NULL, &args);
fd = open(args.infile, O_RDONLY);
if (fd < 0)
error(1, errno, "failed to open `%s' for reading", args.infile);
ret = fstat(fd, &instat);
if (ret)
error(1, errno, "failed to obtain the size of `%s'", args.infile);
len = instat.st_size;
buf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
if (!buf)
error(1, errno, "failed to mmap `%s'", args.infile);
fw = findfw(buf, len, &fwlen);
if (!fw)
error(1, 0, "can't find AccessRunner firmware in `%s'", args.infile);
fd = open(args.outfile, O_WRONLY | O_CREAT | O_EXCL,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
if (fd < 0)
error(1, errno, "failed to open `%s' for writing", args.outfile);
if (write(fd, fw, fwlen) != fwlen)
error(1, errno, "failed to write firmware to `%s'", args.outfile);
close(fd);
munmap(buf, len);
printf("found firmware in `%s' at offset %#x\n", args.infile, fw - buf);
}
* cxacru-fw - utility to extract firmware for the USB ADSL modems based on
* Conexant AccessRunner chipset, from the Conexant driver for
* Windows(R)
*
* Copyright (C) 2005 Roman Kagan (rkagan % mail ! ru)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
****************************************************************************/
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <error.h>
#include <argp.h>
#include <stdint.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <endian.h>
#include <byteswap.h>
#if __BYTE_ORDER == __BIG_ENDIAN
static inline uint16_t le16_to_cpup(uint16_t *x) {return bswap_16(*x);}
static inline uint32_t le32_to_cpup(uint32_t *x) {return bswap_32(*x);}
#else
static inline uint16_t le16_to_cpup(uint16_t *x) {return *x;}
static inline uint32_t le32_to_cpup(uint32_t *x) {return *x;}
#endif
uint8_t *findfw(uint8_t *buf, int len, int *fwlen)
{
const static uint8_t fwstart[] = { /* ARM LE asm */
0x1c, 0x24, 0x9f, 0xe5, /* e59f241c ldr r2, [pc, #0x41c] */
0x00, 0x10, 0xa0, 0xe3, /* e3a01000 mov r1, #0x0 */
0x00, 0x10, 0x82, 0xe5, /* e5821000 str r1, [r2] */
0x22, 0x00, 0x00, 0xeb, /* eb000022 bl 0x9c */
};
const static uint8_t bpstart[] = {
0x78, 0x20, 0x9f, 0xe5, /* e59f2078 ldr r2, [pc, #0x78] */
0x01, 0x10, 0xa0, 0xe3, /* e3a01001 mov r1, #0x1 */
0x00, 0x10, 0x82, 0xe5, /* e5821000 str r1, [r2] */
0x70, 0x20, 0x9f, 0xe5, /* e59f2070 ldr r2, [pc, #0x70] */
};
uint8_t *fw, *bp, *nt_header, *sect_header;
uint32_t tmp;
uint16_t nsect;
uint32_t dataoff, datalen;
*fwlen = 0;
/* IMAGE_DOS_HEADER size and .Signature */
if (len < 0x40 || memcmp(buf, "MZ", 2)) {
error(0, 0, "file is not a DOS executable");
return NULL;
}
/* IMAGE_NT_HEADERS size and .Signature */
tmp = le32_to_cpup((uint32_t *) (buf + 0x3c));
nt_header = buf + tmp;
if (len < tmp + 0x18 || memcmp(nt_header, "PE\0\0", 4)) {
error(0, 0, "file is not a portable executable (PE)");
return NULL;
}
/* IMAGE_NT_HEADERS.FileHeader.NumberOfSections */
nsect = le16_to_cpup((uint16_t *) (nt_header + 0x04 + 0x2));
/* IMAGE_NT_HEADERS.FileHeader.SizeOfOptionalHeader */
tmp = le16_to_cpup((uint16_t *) (nt_header + 0x04 + 0x10));
sect_header = nt_header + 0x18 + tmp;
for (; nsect; nsect--, sect_header += 0x28) {
if (sect_header + 0x28 > buf + len) {
error(0, 0, "file header corrupted");
return NULL;
}
if (!memcmp(sect_header, ".data", 5))
break;
}
if (!nsect) {
error(0, 0, "`.data' section not found");
return NULL;
}
/* IMAGE_SECTION_HEADER.SizeOfRawData */
datalen = le32_to_cpup((uint32_t *) (sect_header + 0x10));
/* IMAGE_SECTION_HEADER.PointerToRawData */
dataoff = le32_to_cpup((uint32_t *) (sect_header + 0x14));
if (dataoff + datalen > len) {
error(0, 0, "`.data' section extends beyond end of file");
return NULL;
}
/* find the starting sequence of the firmware image */
fw = (uint8_t *) memmem(buf + dataoff, datalen, fwstart, sizeof(fwstart));
if (!fw) {
error(0, 0, "firmware start sequence not found");
return NULL;
}
*fwlen = datalen - (fw - (buf + dataoff));
/* find the starting sequence of the boot ROM patch, if present */
bp = (uint8_t *) memmem(fw, *fwlen, bpstart, sizeof(bpstart));
if (bp)
*fwlen = bp - fw;
return fw;
}
const char * argp_program_version = "002";
const char * argp_program_bug_address =
"<accessrunner-general at lists dot sourceforge dot net>";
const static char args_doc[] = "INFILE OUTFILE";
const static char doc[] =
"Firmware extractor for Conexant AccessRunner ADSL USB modems\n"
"INFILE - Windows driver file containing firmware (usually CnxEtU.sys)\n"
"OUTFILE - firmware image (usually cxacru-fw.bin)";
struct args {
char *infile;
char *outfile;
};
static error_t parse_opts(int key, char *arg, struct argp_state *state)
{
struct args *args = state->input;
switch (key) {
case ARGP_KEY_ARG:
switch (state->arg_num) {
case 0:
args->infile = arg;
break;
case 1:
args->outfile = arg;
break;
default:
argp_usage (state);
}
break;
case ARGP_KEY_END:
if (state->arg_num < 2)
argp_usage (state);
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
static struct argp argp = {0, parse_opts, args_doc, doc};
int main(int argc, char **argv)
{
int ret, fd;
struct args args;
struct stat instat;
uint8_t *buf, *fw;
int len, fwlen;
argp_parse(&argp, argc, argv, 0, NULL, &args);
fd = open(args.infile, O_RDONLY);
if (fd < 0)
error(1, errno, "failed to open `%s' for reading", args.infile);
ret = fstat(fd, &instat);
if (ret)
error(1, errno, "failed to obtain the size of `%s'", args.infile);
len = instat.st_size;
buf = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
if (!buf)
error(1, errno, "failed to mmap `%s'", args.infile);
fw = findfw(buf, len, &fwlen);
if (!fw)
error(1, 0, "can't find AccessRunner firmware in `%s'", args.infile);
fd = open(args.outfile, O_WRONLY | O_CREAT | O_EXCL,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
if (fd < 0)
error(1, errno, "failed to open `%s' for writing", args.outfile);
if (write(fd, fw, fwlen) != fwlen)
error(1, errno, "failed to write firmware to `%s'", args.outfile);
close(fd);
munmap(buf, len);
printf("found firmware in `%s' at offset %#x\n", args.infile, fw - buf);
}
C) Una vez compilado, nos posamos desde una Terminal en la carpeta donde lo compilamos y extraemos el Firmware del archivo CnxEtU.sys.
Citar
cxacru-fw CnxEtU.sys FirmwareModemAmigo.bin
3- Creando la Interfaz
En este punto debemos tener extraido el Firmware y copiado el firmware.bin en /lib/firmware/"NUESTRO KERNEL" y reiniciado nuestro ordenador.
Para saber donde se encuentra el directorio en nuestra distribucion abrimos una Terminal y tecleamos "whereis firmware"
Ahora bien, teniendo esto el modem tendria que ser reconocido.
A) Ya teniendo instalada la libreria br2684ctl pasaremos a crear la interfaz NAS0.
En este punto debemos averiguar cual es nuestro VPI/VCI para nuestro ISP. (Telecom Argentina: 0.33, Telefonica Argentina: 8.32)
Desde una terminal como root o usando "sudo":
Citar
br2684ctl -b -c 0 -a "VPI/VCI"
Claro esta que reemplazaremos "VPI/VCI" por el nuetro (0.33,8.32, etc).
Esto nos creara la interfaz NAS0
4- Configurando PPPoe
A) Ahora configuraremos nuestra conexión lanzando desde una Terminal "pppoeconf".
La configuramos intuitivamente
B) Una vez configurada nececitamos modificar unos parametros de la conexión.
Nos vamos en busca del archivo /etc/ppp/peers/dsl-provider.
Si no encontramos nuestro directorio /etc/ppp desde una Terminal tecleamos "whereis ppp".
Ahora, vamos a modificar todas las lineas del archivo MENOS la ultima que es el usuario (El passwd es almacenado en otro archivo) y vamos a reemplazarlas por estas:
dsl-provider
Citar
lock
debug
noipdefault
defaultroute
replacedefaultroute
hide-password
lcp-echo-interval 15
lcp-echo-failure 4
noauth
persist
mtu 1492
mru 1492
holdoff 4
maxfail 25
persist
asyncmap 0
usepeerdns
plugin /usr/lib/pppd/2.4.4b1/rp-pppoe.so nas0
debug
noipdefault
defaultroute
replacedefaultroute
hide-password
lcp-echo-interval 15
lcp-echo-failure 4
noauth
persist
mtu 1492
mru 1492
holdoff 4
maxfail 25
persist
asyncmap 0
usepeerdns
plugin /usr/lib/pppd/2.4.4b1/rp-pppoe.so nas0
Puede llegar a variar la ultima linea segun la distribucion
5- Lanzamos la conexión
Para lanzar la conexión a internet y poder conectarnos nececitamos teclear en una Terminal lo siguiente:
Citar
pon dsl-provider
Y ya estamos conectados a internet, solo falta un paso, la automatizacion
.6- Automatizacion
Para no tener que crear la interfaz NAS0 y lanzar "pon dsl-provider" manualmente cada vez que querramos conectarnos, vamos a automatizarlo.
Creamos un archivo en el Desktop llamado "CONECTAR.sh"
Volcamos a su contenido las siguientes lineas:
Citar
sudo br2684ctl -b -c 0 -a "VPI/VCI"
pon dsl-provider
pon dsl-provider
Siempre reemplazando VPI/VCI por el de nuestro ISP.
Ahora le damos al archivo las propiedades de ejecutar y listo.
Cuando querramos conectarnos a internet le damos doble-click a CONECTAR.sh y elejimos "Ejecutar en un Terminal".
Disfruten de su conexión con el amigable modem AMIGO
.Saludos.
En línea
