From 4e2aac5e36dc411f42540c3c77a3440ce56062f4 Mon Sep 17 00:00:00 2001 From: Jonathan McDowell Date: Tue, 18 Apr 2000 12:00:00 -0700 Subject: [PATCH 1/1] Initial import of sersniff 0.0.3 --- HISTORY | 18 +++ LICENSE | 280 +++++++++++++++++++++++++++++++++++++++ Makefile | 15 +++ README | 124 ++++++++++++++++++ TODO | 11 ++ disp_basic.c | 95 ++++++++++++++ disp_basic.h | 41 ++++++ disp_ncurses.c | 96 ++++++++++++++ disp_ncurses.h | 41 ++++++ sersniff.c | 345 +++++++++++++++++++++++++++++++++++++++++++++++++ tcp.c | 95 ++++++++++++++ tcp.h | 14 ++ 12 files changed, 1175 insertions(+) create mode 100644 HISTORY create mode 100644 LICENSE create mode 100644 Makefile create mode 100644 README create mode 100644 TODO create mode 100644 disp_basic.c create mode 100644 disp_basic.h create mode 100644 disp_ncurses.c create mode 100644 disp_ncurses.h create mode 100644 sersniff.c create mode 100644 tcp.c create mode 100644 tcp.h diff --git a/HISTORY b/HISTORY new file mode 100644 index 0000000..7c2e15c --- /dev/null +++ b/HISTORY @@ -0,0 +1,18 @@ +0.0.1 - 10th September 1999 + +First public release. + +0.0.2 - 4th December 1999 + +* Extra error checking added (Cornelius Cook) +* Command line options added (Cornelius Cook) +* Added TCP module. +* Added silent option. +* More documentation about filtering. + +0.0.3 - 18th April 2000 + +* Look change and select code added (Cornelius Cook) +* Some socket tweaks (Cornelius Cook) +* Started breaking out display code in preparation for ncurses version. +* Added check for closed sockets. diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..b2852a9 --- /dev/null +++ b/LICENSE @@ -0,0 +1,280 @@ +GNU GENERAL PUBLIC LICENSE + + Version 2, June 1991 +Copyright (C) 1989, 1991 Free Software Foundation, Inc. +59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + +Everyone is permitted to copy and distribute verbatim copies +of this license document, but changing it is not allowed. + +Preamble + + The licenses for most software are designed to take away your freedom + to share and change it. 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Having hastily thrown +together the code to do what I needed it occured to me that others may +have a use for something similiar and that having a skeleton available +may help. + +(Aside: Of course, in the usual tradition of Open Source, someone got +there before. Checkout nserver from +http://users.globalnet.co.uk/~syrinx/ if your interested in the Nokia +stuff.) + +I feel that the concept could be taken a lot further, with various +filters and so on being constructed (given a framework in which to +construct them) similiar to that available with ethernet sniffers. This +could aid with the disassembly of unknown protocols over serial lines or +even for debugging serial connections. Maybe I'll write this code +someday, maybe not. Maybe someone else will and will send me a patch. :) + + +Command line options: + +sersniff [-h] [-i DEVICE | -l PORT] [-o DEVICE | -c HOST:PORT] [-b BAUD] [-s] + +-h + Displays some command line option help. + +-i IN_DEV + Set the device to use for Port1, if you're using serial ports. + Default of /dev/ttyS0 + +-l PORT + Set the port to listen on, if you want Port1 to be a TCP socket. + +-o OUT_DEV + Set the device to use for Port2, if you're using serial ports. + Default of /dev/ttyS1 + +-c HOST:PORT + Specify the host and port to connect to if Port2 is to be a TCP + socket. + +-b BAUD + Specify baud rate for serial connections. Defaults to 19200. + +-s + Make sersniff not copy data between the two ports - useful if a + Y cable is being used for serial port sniffing for example. + + +TCP/serial things: + +This program was originally written to cope with serial port data. I +have added simple support for a TCP connection both to aid with +development (it's a /lot/ easier for me to generate TCP streams than +serial streams) and also because I think a lot of the things that are +useful for monitoring a serial port data stream can also be applied to +TCP. Taking this further leads to thinking about UDP/raw ethernet - I'll +think about it once I get some filtering stuff in. + +The TCP stuff does a simple listen on a port and then connects to the +host/port specified. I see no reason why it couldn't be used to allow +telneting to a serial port or connecting from a serial port to a TCP +port, but I haven't tested this. + + +Filtering: + +This is a definite to do. For example, let's assume a regex based +scheme. We could implement the current filter as something like: + +/\x0A/ +/\x0D/ +/\x1B/ +/./ . + +(Yeah, ok, I need to think about syntax. This doesn't cover the < 32 or +> 127 range) + +But then say we learn a bit about our protocol? Let's assume VT100 for a +moment, then we might want: + +/\x0A/ +/\x0D/ +/\x1B/ +/\x1B[2J/ +/\x1B[0m/ +/\0x7/ +/./ . + +Now that's more useful, isn't it? And if it came with filters for common +serial protocols, that might be useful too? Say a VT100 one, a PPP one, +a UUCP one, well, you get the idea hopefully. + +Anyway, this is a major to do. Just needs me to get a round tuit and +think about syntax. + + +Development system: + +sersniff was originally written under Linux on a 486dx2-66. It is +currently being worked on under FreeBSD on a Cyrix P233+. + + +Contacting the author: + +I can be reached as noodles@earth.li or on Fidonet as Jonathan McDowell +@ 2:443/21 + +All constructive criticism about sersniff is welcome. + + +License: + +sersniff is distributed under the GNU Public License, a copy of which +should have been provided with this archive as LICENSE. diff --git a/TODO b/TODO new file mode 100644 index 0000000..51f3902 --- /dev/null +++ b/TODO @@ -0,0 +1,11 @@ +* Make configurable (serial port, speed, flow control etc) + Partly done by Cornelius Cook. + +* Add option to dump to file and display status on screen. + +* Nicer way to terminate program than Ctrl-C/KILLing it. + +* Lock serial ports. + +* Add filtering rules capability. + Perhaps look at some regex libraries? diff --git a/disp_basic.c b/disp_basic.c new file mode 100644 index 0000000..39f4e36 --- /dev/null +++ b/disp_basic.c @@ -0,0 +1,95 @@ +/* + disp_basic.c - Routines to do basic output with no fanciness. + Copyright 2000 Project Purple. Written by Jonathan McDowell + + 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. + http://www.gnu.org/copyleft/gpl.html + + 17/02/2000 - Started writing. +*/ + +#include + +#include "disp_basic.h" + +/* Which port did we display last? */ +static int last=-1; +/* Count of chars so far this line */ +static int wrap=WRAPINIT; + + +/* Initialise the display, ie do nothing */ +int disp_init() +{ + return 0; +} + +/* Close the display, ie do nothing */ +int disp_close() +{ + return 0; +} + +/* Output a status string about what's happening */ +void disp_outputstatus(char *string) +{ + printf("\n%s\n\t", string); + last=-1; + wrap=WRAPINIT; +} + +/* Output a string from the port. */ +void disp_outputstr(int port, char *string, + long usec_threshold, long usec_waited) +{ + if (usec_waited>usec_threshold) { + /* report how long we waited between the last port */ + if (wrap!=WRAPINIT) printf("\n"); + printf("\t\n", + usec_waited / USEC, + usec_waited % USEC); + wrap=WRAPINIT; + } + + if (last!=port) { + /* If we didn't just send a CR, we need to now */ + if (wrap!=WRAPINIT) printf("\n"); + printf("\nPort%d:\t", port); + last=port; + wrap=WRAPINIT; + } else if (wrap==WRAPINIT) { + /* We should indent since we're continuing the same port + as last time */ + printf("\t"); + } + + /* If we'd go over the line end, wrap */ + if (strlen(string)+wrap > SCREEN_WIDTH) { + wrap=WRAPINIT; + printf("\n\t"); + } + + wrap+=strlen(string); + printf("%s", string); + + if (wrap % SCREEN_WIDTH == 0) { + /* we hit the edge of the screen */ + wrap=WRAPINIT; + printf("\n"); + } + + /* flush all the time */ + fflush(NULL); +} diff --git a/disp_basic.h b/disp_basic.h new file mode 100644 index 0000000..cd6062b --- /dev/null +++ b/disp_basic.h @@ -0,0 +1,41 @@ +/* + disp_basic.h - Routines to do basic output with no fanciness. + Copyright 2000 Project Purple. Written by Jonathan McDowell + + 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. + http://www.gnu.org/copyleft/gpl.html + + 17/02/2000 - Started writing. +*/ + +/* where to start wrap counts (needs to include "PortX:\t") */ +#define WRAPINIT 9 +/* Screen width */ +#define SCREEN_WIDTH 80 +#define USEC 1000000 + +/* Initialise the display, ie do nothing */ +int disp_init(); + +/* Close the display, ie do nothing */ +int disp_close(); + +/* Output a status string about what's happening */ +void disp_outputstatus(char *string); + +/* Output a string from the port. */ +void disp_outputstr(int port, char *string, + long usec_threshold, long usec_waited); + diff --git a/disp_ncurses.c b/disp_ncurses.c new file mode 100644 index 0000000..c390ed7 --- /dev/null +++ b/disp_ncurses.c @@ -0,0 +1,96 @@ +/* + disp_ncurses.c - Routines to do pretty ncurses output. + Copyright 2000 Project Purple. Written by Jonathan McDowell + + 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. + http://www.gnu.org/copyleft/gpl.html + + 17/02/2000 - Started writing. +*/ + +#include +#include + +#include "disp_ncurses.h" + +/* Which port did we display last? */ +static int last=-1; +/* Count of chars so far this line */ +static int wrap=WRAPINIT; + + +/* Initialise the display */ +int disp_init() +{ + return 0; +} + +/* Close the display */ +int disp_close() +{ + return 0; +} + +/* Output a status string about what's happening */ +void disp_outputstatus(char *string) +{ + printf("\n%s\n\t", string); + last=-1; + wrap=WRAPINIT; +} + +/* Output a string from the port. */ +void disp_outputstr(int port, char *string, + long usec_threshold, long usec_waited) +{ + if (usec_waited>usec_threshold) { + /* report how long we waited between the last port */ + if (wrap!=WRAPINIT) printf("\n"); + printf("\t\n", + usec_waited / USEC, + usec_waited % USEC); + wrap=WRAPINIT; + } + + if (last!=port) { + /* If we didn't just send a CR, we need to now */ + if (wrap!=WRAPINIT) printf("\n"); + printf("\nPort%d:\t", port); + last=port; + wrap=WRAPINIT; + } else if (wrap==WRAPINIT) { + /* We should indent since we're continuing the same port + as last time */ + printf("\t"); + } + + /* If we'd go over the line end, wrap */ + if (strlen(string)+wrap > SCREEN_WIDTH) { + wrap=WRAPINIT; + printf("\n\t"); + } + + wrap+=strlen(string); + printf("%s", string); + + if (wrap % SCREEN_WIDTH == 0) { + /* we hit the edge of the screen */ + wrap=WRAPINIT; + printf("\n"); + } + + /* flush all the time */ + fflush(NULL); +} diff --git a/disp_ncurses.h b/disp_ncurses.h new file mode 100644 index 0000000..6580fb1 --- /dev/null +++ b/disp_ncurses.h @@ -0,0 +1,41 @@ +/* + disp_ncurses.h - Routines to do pretty ncurses output. + Copyright 2000 Project Purple. Written by Jonathan McDowell + + 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. + http://www.gnu.org/copyleft/gpl.html + + 17/02/2000 - Started writing. +*/ + +/* where to start wrap counts (needs to include "PortX:\t") */ +#define WRAPINIT 9 +/* Screen width */ +#define SCREEN_WIDTH 80 +#define USEC 1000000 + +/* Initialise the display, ie do nothing */ +int disp_init(); + +/* Close the display, ie do nothing */ +int disp_close(); + +/* Output a status string about what's happening */ +void disp_outputstatus(char *string); + +/* Output a string from the port. */ +void disp_outputstr(int port, char *string, + long usec_threshold, long usec_waited); + diff --git a/sersniff.c b/sersniff.c new file mode 100644 index 0000000..dd28d34 --- /dev/null +++ b/sersniff.c @@ -0,0 +1,345 @@ +/* + sersniff.c - A program to tunnel between 2 serial ports and + sniff the data that passes between them. Designed to aid + working out the protocol between a Nokia 9000i and NServer. + Written by Jonathan McDowell for Project Purple, 1999 + Extra stuff by Cornelius Cook (cook@cpoint.net), 1999 + + 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. + http://www.gnu.org/copyleft/gpl.html + + 07/09/1999 - Started writing. + 21Nov1999 - Cook: added command line support and extra error checking + 27Nov1999 - Cook: added select, timer & changed output look +*/ + +#define VERSION "0.0.3" + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "disp_basic.h" +#include "tcp.h" + +char * speed_str[] = { "300", "1200", "2400", "4800", "9600", "19200", "38400", + "57600", "115200", "230400", NULL }; +speed_t speed_num[] = { B300, B1200, B2400, B4800, B9600, B19200, B38400, + B57600, B115200, B230400, B0 }; + +int openport(const char *device, speed_t baud) +{ + int filedes; + struct termios serparams; + + if ((filedes=open(device, O_RDWR | O_NONBLOCK))==-1) { + /* Can't open device */ + fprintf(stderr,"%s: ",device); + perror(device); + exit(1); + } + + bzero(&serparams, sizeof(serparams)); + + serparams.c_cflag=baud | CLOCAL | CS8 | CREAD; + + if (tcflush(filedes, TCIFLUSH)) { + fprintf(stderr,"%s: ",device); + perror("tcflush"); + exit(1); + } + if (tcsetattr(filedes, TCSANOW, &serparams)) { + fprintf(stderr,"%s: ",device); + perror("tcsetattr"); + exit(1); + } + + return filedes; +} + +int closeport(int filedes) +{ + /* Should remove any locks at this point */ + return close(filedes); +} + +/* + this returns the string for the character passed to it + It could be expanded in the future to maybe to string recognitions? +*/ +char *chardecide(unsigned char c, int alpha) { + static char result[256]; + + /* everyone should take up 5 characters */ + if (alpha) { + if ((c < 32) | (c > 126)) { + switch (c) { + case 10: + sprintf(result,""); + break; + case 13: + sprintf(result,""); + break; + case 27: + sprintf(result,""); + break; + default: + snprintf(result,256,"<%02hX>",c); + break; + } + } else { + snprintf(result,256,"%c",c); + } + } else { + snprintf(result,256,"0x%02hX ",c); + } + return result; +} + +void outputchar(unsigned char c, int port, int alpha, + long usec_threshold, long usec_waited) +{ + char *todisplay; + + todisplay=chardecide(c,alpha); + disp_outputstr(port, todisplay, usec_threshold, usec_waited); +} + +void mainloop(int port1, int port2, int silent, int alpha, long usec_threshold) +{ + unsigned char c1, c2; + int last; + int rc; + fd_set rfds; + fd_set efds; + int biggestfd=0; + int fdret; + struct timeval before; + struct timeval after; + long timediff; + int quit=0; + + /* need the largest fd for the select call */ + biggestfd=port1 > port2 ? port1 : port2; + biggestfd++; + last=0; + + while (!quit) { + /* reset the select set */ + FD_ZERO(&rfds); + FD_ZERO(&efds); + FD_SET(port1,&rfds); + FD_SET(port1,&efds); + FD_SET(port2,&rfds); + FD_SET(port2,&efds); + + if (gettimeofday(&before,NULL)) { + perror("gettimeofday"); + exit(1); + } + if ((fdret=select(biggestfd, &rfds, NULL, &efds, NULL))<0) { + perror("select"); + exit(1); + } + if (gettimeofday(&after,NULL)) { + perror("gettimeofday"); + exit(1); + } + + /* get seconds difference */ + timediff=after.tv_sec-before.tv_sec; + /* convert to micro seconds */ + timediff*=USEC; + /* add difference in usecs */ + timediff+=after.tv_usec-before.tv_usec; + + if (FD_ISSET(port1, &rfds)) { + for (rc=read(port1, &c1, 1); + rc>0; rc=read(port1, &c1, 1) ) { + outputchar(c1,1,alpha,usec_threshold,timediff); + timediff=0; + if (!silent) write(port2,&c1,1); + } + if (rc==0) { + /* EOF? */ + quit=1; + } + if (rc<0 && errno!=EAGAIN) { + perror("read(port1)"); + exit(1); + } + } + + if (FD_ISSET(port2, &rfds)) { + for (rc=read(port2, &c2, 1); + rc>0; rc=read(port2, &c2, 1) ) { + outputchar(c2,2,alpha,usec_threshold,timediff); + timediff=0; + if (!silent) write(port1,&c2,1); + } + if (rc==0) { + /* EOF? */ + quit=1; + } + if (rc<0 && errno!=EAGAIN) { + perror("read(port2)"); + exit(1); + } + } + + /* check for exceptions (sockets closed, broken, etc) */ + if (FD_ISSET(port1, &efds)) { + /* I can't remember right now what to actually + check for on a fd exception, so we'll just quit */ + fprintf(stderr,"\nException on port1\n"); + quit=1; + } + if (FD_ISSET(port2, &efds)) { + /* I can't remember right now what to actually + check for on a fd exception, so we'll just quit */ + fprintf(stderr,"\nException on port2\n"); + quit=1; + } + } + + closeport(port2); + closeport(port1); +} + +void usage() +{ + fprintf(stderr,"sersniff v%s + +Usage: +sersniff [-h] [-i DEV | -l PORT] [-o DEV | -c HOST:PORT] [-b BAUD] [-w USEC] +-h This help +-x Show hex characters instead of alpha +-i DEVICE Port 1 device (defaults to /dev/ttyS0) +-l PORT Port 1 port for TCP +-o DEVICE Port 2 device (defaults to /dev/ttyS1) +-c HOST:PORT Port 2 host & port to connect to +-b BAUD Baud rate (Defaults to 19200) +-w USECS How many microsecs to wait before reporting a delay + (default is %d) +-s Silent - don't pass data from port1 <=> port2, + just display what we see from them. +",VERSION,USEC); + exit(1); +} + +int main(int argc, char *argv[]) +{ + int optret, speed; + int port1, port2; + char *dev1=NULL; + char *dev2=NULL; + int listenport=0; + int connectport; + char *connecthost=NULL, *tmpchr=NULL; + int show_alpha=1; + speed_t baud=B0; + int silent=0; + long usec_threshold=USEC; + + while ((optret=getopt(argc,argv,"hxsi:l:o:c:b:w:"))!=EOF) { + switch (optret) { + case '?': case 'h': case ':': + usage(); + case 's': + silent=1; + break; + case 'w': + usec_threshold=atoi(optarg); + break; + case 'i': + dev1=strdup(optarg); + break; + case 'o': + dev2=strdup(optarg); + break; + case 'l': + listenport=atoi(optarg); + break; + case 'c': + if ((tmpchr=strchr(optarg, ':'))==NULL) { + printf("Must specify -c option with host:port\n"); + exit(1); + } + *tmpchr='\0'; + connectport=atoi(++tmpchr); + connecthost=strdup(optarg); + break; + case 'x': + show_alpha=0; + break; + case 'b': + for (speed=0; + speed_str[speed]; + speed++) { + if (strstr(optarg,speed_str[speed])==optarg) { + baud=speed_num[speed]; + break; + } + } + if (baud==B0) { + fprintf(stderr,"Unsupported Baud: '%s'\n", + optarg); + exit(1); + } + break; + } + } + + /* Default settings */ + if (!dev1 && !listenport) dev1=strdup("/dev/ttyS0"); + if (!dev2 && !connecthost) dev2=strdup("/dev/ttyS1"); + if (baud==B0) baud=B19200; + + disp_init(); + if (dev1) { + port1=openport(dev1, baud); + } else { + disp_outputstatus("Waiting for connection to TCP port."); + port1=listensock(listenport); + } + + if (dev2) { + port2=openport(dev2, baud); + } else { + disp_outputstatus("Connecting to TCP port."); + port2=opensock(connecthost, connectport); + } + + if (port1 < 0 || port2 < 0) { + fprintf(stderr,"Argh. An open failed!\n"); + exit(1); + } + + mainloop(port1, port2, silent, show_alpha, usec_threshold); + + /* Clean up */ + if (dev1) free(dev1); + if (dev2) free(dev2); + if (connecthost) free(connecthost); + disp_close(); + + return 0; +} diff --git a/tcp.c b/tcp.c new file mode 100644 index 0000000..b8f2b67 --- /dev/null +++ b/tcp.c @@ -0,0 +1,95 @@ +/* + tcp.c - Routines to give us handles to tcp ports. + Copyright 1999 Project Purple. Written by Jonathan McDowell + + 27/11/1999 - Started writing. +*/ + +#include +#include +#include +#include +#include +#include +#include + +int opensock(char *host, int port) +{ + int sock; + struct sockaddr_in saddr; + struct hostent *hoste; + + if ((hoste=gethostbyname(host))==NULL) { + perror("gethostbyname()"); + return -1; + } + + if ((sock=socket(AF_INET, SOCK_STREAM, 0))==-1) { + perror("socket()"); + return -1; + } + + saddr.sin_addr = *(struct in_addr *) hoste->h_addr; + saddr.sin_family = AF_INET; + saddr.sin_port = htons(port); + + if ((connect(sock, (struct sockaddr *) &saddr, sizeof(struct sockaddr_in)))==-1) { + perror("connect()"); + return -1; + } + + if (fcntl(sock, F_SETFL, O_NONBLOCK)==-1) { + perror("fcntl()"); + return -1; + } + + return sock; +} + +int listensock(int port) +{ + int sock, newsock; + struct sockaddr_in saddr; + int saddrlen; + int on; + + if ((sock=socket(AF_INET, SOCK_STREAM, 0))==-1) { + perror("socket()"); + return -1; + } + + on=1; + if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on))) { + perror("setsockopt(SO_REUSEADDR)"); + return -1; + } + + saddr.sin_addr.s_addr = INADDR_ANY; + saddr.sin_family = AF_INET; + saddr.sin_port = htons(port); + saddrlen = sizeof(saddr); + + if (bind(sock, (struct sockaddr *) &saddr, saddrlen)==-1) { + perror("bind()"); + return -1; + } + + if (listen(sock, 0)==-1) { + perror("listen()"); + return -1; + } + + if ((newsock=accept(sock, (struct sockaddr *) &saddr, &saddrlen))==-1) { + perror("accept()"); + return -1; + } + + if (fcntl(newsock, F_SETFL, O_NONBLOCK)==-1) { + perror("fcntl()"); + return -1; + } + + close(sock); + + return newsock; +} diff --git a/tcp.h b/tcp.h new file mode 100644 index 0000000..378079e --- /dev/null +++ b/tcp.h @@ -0,0 +1,14 @@ +/* + tcp.h - Routines to give us handles to tcp ports. + Copyright 1999 Project Purple. Written by Jonathan McDowell + + 27/11/1999 - Started writing. +*/ + +#ifndef __TCP_H_ +#define __TCP_H_ + +int opensock(char *host, int port); +int listensock(int port); + +#endif __TCP_H_ -- 2.39.5