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serial-split.patch
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File serial-split.patch of Package xen
Index: xen-4.1.2-testing/tools/misc/serial-split/Makefile =================================================================== --- /dev/null +++ xen-4.1.2-testing/tools/misc/serial-split/Makefile @@ -0,0 +1,20 @@ +CC ?= gcc +CFLAGS ?= -Wall -Os +CFILES = $(wildcard *.c) +OBJS = $(patsubst %.c,%.o,$(wildcard *.c)) +TARGET = serial-split + +all: $(TARGET) + +install: all + install -d $(DESTDIR)/usr/bin + install -s $(TARGET) $(DESTDIR)/usr/bin/ + +clean: + rm *.o $(TARGET) *~ + +$(TARGET): $(OBJS) + $(CC) $(CFLAGS) -o $@ $^ + +%.o: %.c Makefile + $(CC) $(CFLAGS) -c -o $@ $< Index: xen-4.1.2-testing/tools/misc/serial-split/serial-split.c =================================================================== --- /dev/null +++ xen-4.1.2-testing/tools/misc/serial-split/serial-split.c @@ -0,0 +1,422 @@ +/* + * serial-split.c + * pdb / console splitter + * + * Copyright 2005 Charles Coffing <ccoffing@novell.com> + * + * 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. + * + */ + +/* + * Typical setup: + * + * Development box Xen box + * ...-----+ +-----... + * +---------+ | | + * | gdb | | | + * | |\ high | | + * +---------+ \ | | + * \+-----------+ | serial | +------------------+ + * | splitter |------------| Xen | + * /+-----------+ | | | - pdb (com1H)| + * +---------+ / | | | - printk (com1) | + * | console |/ low | | +------------------+ + * | viewer | | | + * +---------+ | | + * ...-----+ +-----... + */ + + +#include <assert.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <fcntl.h> +#include <termios.h> +#include <sys/signal.h> +#include <sys/time.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#include <netinet/in.h> + +const unsigned int DefaultLowPort = 12010; +const unsigned int DefaultBaud = 115200; +const char DefaultSerialDevice[] = "/dev/ttyS0"; + +#define DEBUG 0 +#define MAX(a,b) ((a)<(b)?(b):(a)) + + +static int cook_baud(int baud) +{ + int cooked_baud = 0; + switch (baud) + { + case 50: cooked_baud = B50; break; + case 75: cooked_baud = B75; break; + case 110: cooked_baud = B110; break; + case 134: cooked_baud = B134; break; + case 150: cooked_baud = B150; break; + case 200: cooked_baud = B200; break; + case 300: cooked_baud = B300; break; + case 600: cooked_baud = B600; break; + case 1200: cooked_baud = B1200; break; + case 1800: cooked_baud = B1800; break; + case 2400: cooked_baud = B2400; break; + case 4800: cooked_baud = B4800; break; + case 9600: cooked_baud = B9600; break; + case 19200: cooked_baud = B19200; break; + case 38400: cooked_baud = B38400; break; + case 57600: cooked_baud = B57600; break; + case 115200: cooked_baud = B115200; break; + } + return cooked_baud; +} + + +static int start_listener(unsigned short port) +{ + int fd; + struct sockaddr_in sin; + int on = 1; + + if ((fd = socket (AF_INET, SOCK_STREAM, 0)) < 0) + { + perror("socket"); + goto out1; + } + + setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)); + + memset(&sin, 0, sizeof(sin)); + sin.sin_family = AF_INET; + sin.sin_port = htons (port); + sin.sin_addr.s_addr = INADDR_ANY; + if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) + { + perror("bind"); + goto out2; + } + + if (listen(fd, 1) < 0) + { + perror("listen"); + goto out2; + } + + fprintf(stderr, "Listening on port %d\n", port); + + return fd; + +out2: + close(fd); +out1: + return -1; +} + + +static int accept_conn(int fd) +{ + int on = 1; + int new_fd; + struct sockaddr_in from; + socklen_t fromlen = sizeof(from); + + new_fd = accept(fd, (struct sockaddr *)&from, &fromlen); + if (new_fd < 0) + perror("accept"); + ioctl(new_fd, FIONBIO, &on); + + fprintf(stderr, "Accepted connection on %d\n", new_fd); + + return new_fd; +} + + +static void close_conn(int * fd) +{ + shutdown(*fd, 2); + close(*fd); + *fd = -1; +} + + +static int receive_data(int * fd, char * buf, ssize_t max_bytes, int * poll) +{ + ssize_t bytes; + if ((bytes = read(*fd, buf, max_bytes)) < 0) + { + perror("read"); + *poll = 1; + return 0; + } + else if (bytes == 0) + { + close_conn(fd); + *poll = 0; + return 0; + } + else + { + if (bytes == max_bytes) + *poll = 1; + else + *poll = 0; +#if DEBUG + { + ssize_t i; + fprintf(stderr, "Received %d bytes on %d:\n", bytes, *fd); + for (i = 0; i < bytes; ++ i) + { + if ((i & 0xf) == 0) + printf(" "); + printf("%02x", buf[i] & 0xff); + if (((i+1) & 0xf) == 0 || i + 1 == bytes) + printf("\n"); + else + printf(" "); + } + } +#endif + return bytes; + } +} + + +static void set_high_bit(char * buf, size_t bytes) +{ + size_t i; + for(i = 0; i < bytes; ++ i) + buf[i] |= 0x80; +} + + +static void clear_high_bit(char * buf, size_t bytes) +{ + size_t i; + for(i = 0; i < bytes; ++ i) + buf[i] &= 0x7f; +} + + +static int open_serial(char const * serial_dev, int baud) +{ + struct termios newsertio; + int serial_fd; + memset(&newsertio, 0, sizeof(newsertio)); + + if ((serial_fd = open(serial_dev, O_RDWR | O_NOCTTY | O_NONBLOCK)) < 0) + { + perror(serial_dev); + return -1; + } + + newsertio.c_cflag = baud | CS8 | CLOCAL | CREAD; + newsertio.c_iflag = IGNBRK | IGNPAR; /* raw input */ + newsertio.c_oflag = 0; /* raw output */ + newsertio.c_lflag = 0; /* no echo, no signals */ + newsertio.c_cc[VMIN] = 1; + newsertio.c_cc[VTIME] = 0; + tcflush(serial_fd, TCIFLUSH); + tcsetattr(serial_fd, TCSANOW, &newsertio); + + fprintf(stderr, "Listening on %s\n", serial_dev); + + return serial_fd; +} + + +static void main_loop(int serial_fd, int low_listener, int high_listener) +{ + fd_set rdfds; + int low_poll = 0, high_poll = 0, serial_poll = 0; + int low_fd = -1, high_fd = -1; + + while(1) + { + char buf[1024]; + ssize_t bytes; + int max; + + FD_ZERO(&rdfds); + FD_SET(low_fd < 0 ? low_listener : low_fd, &rdfds); + FD_SET(high_fd < 0 ? high_listener : high_fd, &rdfds); + FD_SET(serial_fd, &rdfds); + + max = MAX(low_fd, low_listener); + max = MAX(max, high_fd); + max = MAX(max, high_listener); + max = MAX(max, serial_fd); + + if (select(max + 1, &rdfds, NULL, NULL, NULL) < 0) + { + perror("select"); + continue; + } + + if (FD_ISSET(low_listener, &rdfds)) + { + assert(low_fd < 0); + low_fd = accept_conn(low_listener); + } + + if (FD_ISSET(high_listener, &rdfds)) + { + assert(high_fd < 0); + high_fd = accept_conn(high_listener); + } + + if (low_poll || (low_fd >= 0 && FD_ISSET(low_fd, &rdfds))) + { + if ((bytes = receive_data(&low_fd, &buf[0], sizeof(buf), + &low_poll)) > 0) + { + clear_high_bit(&buf[0], bytes); + if (write(serial_fd, &buf[0], bytes) < 0) + perror("write"); + } + } + + if (high_poll || (high_fd >= 0 && FD_ISSET(high_fd, &rdfds))) + { + if ((bytes = receive_data(&high_fd, &buf[0], sizeof(buf), + &high_poll)) > 0) + { + set_high_bit(&buf[0], bytes); + if (write(serial_fd, &buf[0], bytes) < 0) + perror("write"); + } + } + + if (serial_poll || FD_ISSET(serial_fd, &rdfds)) + { + if ((bytes = receive_data(&serial_fd, &buf[0], sizeof(buf), + &serial_poll)) > 0) + { + ssize_t i; + for (i = 0; i < bytes; ++ i) + { + if (buf[i] & 0x80) + { + if (high_fd >= 0) + { + buf[i] &= 0x7f; + if ((write(high_fd, &buf[i], 1)) < 0) + { + perror("write"); + close_conn(&high_fd); + high_poll = 0; + } + } + } + else + { + if (low_fd >= 0) + { + if ((write(low_fd, &buf[i], 1)) < 0) + { + perror("write"); + close_conn(&low_fd); + low_poll = 0; + } + } + } + } + } + } + } +} + + +static void usage() +{ + printf( +"Description:\n" +" Splits the serial port between two TCP ports. Bytes read from the\n" +" serial port will be delivered to one of the two TCP ports (high or\n" +" low) depending on whether the high bit is set. Bytes written to the\n" +" TCP ports will be forwarded to the serial port; the high bit will be\n" +" set or cleared to denote the source.\n" +"Usage:\n" +" serial-split [-d<serial-device>] [-b<baud>]\n" +" [-l<low-port>] [-h<high-port>]\n" +"Parameters:\n" +" -d<serial-device> Defaults to %s.\n" +" -b<baud> Baud rate of the serial port. Defaults to %d.\n" +" Also assumes 8N1.\n" +" -l<low-port> Low TCP port. Defaults to %d, or one less than\n" +" the high port.\n" +" -h<high-port> High TCP port. Defaults to %d, or one more than\n" +" the low port.\n", +DefaultSerialDevice, DefaultBaud, DefaultLowPort, DefaultLowPort + 1); + + exit(1); +} + + +int main(int argc, char **argv) +{ + int cooked_baud = cook_baud(DefaultBaud); + char const * serial_dev = DefaultSerialDevice; + int low_port = -1, high_port = -1; + int serial_fd, low_listener, high_listener; + + while ( --argc != 0 ) + { + char *p = argv[argc]; + if ( *(p++) != '-' ) + usage(); + switch (*(p++)) + { + case 'b': + if ( (cooked_baud = cook_baud(atoi(p))) == 0 ) + { + fprintf(stderr, "Bad baud rate\n"); + exit(1); + } + break; + case 'd': + serial_dev = p; + break; + case 'l': + if ((low_port = atoi(p)) <= 0) + usage(); + break; + case 'h': + if ((high_port = atoi(p)) <= 0) + usage(); + break; + default: + usage(); + } + } + + if (low_port == -1 && high_port == -1) + low_port = DefaultLowPort; + if (low_port == -1) + low_port = high_port - 1; + if (high_port == -1) + high_port = low_port + 1; + + if ((serial_fd = open_serial(serial_dev, cooked_baud)) < 0 || + (low_listener = start_listener(low_port)) < 0 || + (high_listener = start_listener(high_port)) < 0) + exit(1); + + main_loop(serial_fd, low_listener, high_listener); + + return 0; +} +
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