Maybe it's not in the spirit of this mailing group but what of the question of purposeful abuse of the anon mailers/newsposters? Say for instance some person posts either a sh*tload of garbage to every known group, flooding the USENET or a more personal attack whereby they send out anonymously information that was so fundamentally personal to someone they could possibly react very badly.... What if someone posted some top secret information and the various three letter acronyms all went out for someone's blood. As a few people have mentioned they would *like* the opportunity to use an anon system but the initial step of creating and running it isnt so appealing due to the fundamental dangers of it. Most people would respect such systems but you find one really rotten or immature loser that will use it for there own anti-social ends. Comments? Mark mark@coombs.anu.edu.au mark@gnu.ai.mit.edu markm@rmit.edu.au
I've fixed the IP bouncer so it doesnt chew so much cpu any more, backgrounds itself and detachs from the tty. In testing last night, it was using less %cpu than the telnet being used to connect to it on the same machine (hope that bodes well! :). Darren ----------------------------------------------------------------------------- /* This file is telserv.c and is part of the Telnet Server package v. 1.0, written by "Hal-9000". Much of this package was developed by Richard Stephens and my thanks go to "Xanadude" for providing me with that section. Performance fix by Darren Reed. To compile, type "cc -O -s telserv.c -o telserv". */ #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <fcntl.h> #include <errno.h> #include <netinet/in.h> #include <arpa/inet.h> #include <sys/ioctl.h> #define SERV_TCP_PORT 12345 /* port I'll listen for connections on */ #define REM_HOST_ADDR "127.0.0.1" /* host I will bounce to */ #define REM_TCP_PORT 19 /* port I will bounce to */ char sbuf[2048], cbuf[2048]; main() { int sockfd, newsockfd, clilen, childpid, opt = 1; struct sockaddr_in cli_addr, serv_addr; sockfd = socket(AF_INET, SOCK_STREAM, 0); setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); bzero((char *) &serv_addr, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); serv_addr.sin_port = htons(SERV_TCP_PORT); if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) == -1) { perror("bind"); exit(-1); } listen(sockfd, 5); setpgrp(getpid(), 0); close(0); close(1); close(2); #ifdef TIOCNOTTY if ((newsockfd = open("/dev/tty", O_RDWR)) >= 0) { ioctl(newsockfd, TIOCNOTTY, (char *)0); close(newsockfd); } #endif if (fork()) exit(0); while (1) { clilen = sizeof(cli_addr); newsockfd=accept(sockfd, (struct sockaddr *) &cli_addr, &clilen); if (newsockfd == -1) exit(-1); setsockopt(newsockfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); /* ** NB: FNDELAY and O_NDELAY aren't the same on all machines and on most ** we want FNDELAY. The differences are subtle but differences all the ** same. */ #ifdef FNDELAY fcntl(newsockfd,F_SETFL,fcntl(newsockfd,F_GETFL,0)|FNDELAY); #else fcntl(newsockfd,F_SETFL,O_NDELAY); #endif childpid = fork(); if (childpid == 0) { /* child process */ close(sockfd); /* close original socket */ telcli(newsockfd); /* process the request */ exit(0); } close(newsockfd); /* parent process */ wait(0); } } telcli(clisockfd) { int servsockfd; struct sockaddr_in serv_addr; bzero((char *) &serv_addr, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = inet_addr(REM_HOST_ADDR); serv_addr.sin_port = htons(REM_TCP_PORT); servsockfd = socket(AF_INET, SOCK_STREAM, 0); connect(servsockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)); #ifdef FNDELAY fcntl(servsockfd,F_SETFL,fcntl(clisockfd,F_GETFL,0)|FNDELAY); #else fcntl(servsockfd,F_SETFL,O_NDELAY); #endif communicate(servsockfd,clisockfd); close(servsockfd); exit(0); } communicate(sfd,cfd) { char *chead, *ctail, *shead, *stail; int num, nfd, spos, cpos; extern int errno; fd_set rd, wr; chead = ctail = cbuf; cpos = 0; shead = stail = sbuf; spos = 0; while (1) { FD_ZERO(&rd); FD_ZERO(&wr); if (spos < sizeof(sbuf)-1) FD_SET(sfd, &rd); if (ctail > chead) FD_SET(sfd, &wr); if (cpos < sizeof(cbuf)-1) FD_SET(cfd, &rd); if (stail > shead) FD_SET(cfd, &wr); nfd = select(256, &rd, &wr, 0, 0); if (nfd <= 0) continue; if (FD_ISSET(sfd, &rd)) { num=read(sfd,stail,sizeof(sbuf)-spos); if ((num==-1) && (errno != EWOULDBLOCK)) return; if (num==0) return; if (num>0) { spos += num; stail += num; if (!--nfd) continue; } } if (FD_ISSET(cfd, &rd)) { num=read(cfd,ctail,sizeof(cbuf)-cpos); if ((num==-1) && (errno != EWOULDBLOCK)) return; if (num==0) return; if (num>0) { cpos += num; ctail += num; if (!--nfd) continue; } } if (FD_ISSET(sfd, &wr)) { num=write(sfd,chead,ctail-chead); if ((num==-1) && (errno != EWOULDBLOCK)) return; if (num>0) { chead += num; if (chead == ctail) { chead = ctail = cbuf; cpos = 0; } if (!--nfd) continue; } } if (FD_ISSET(cfd, &wr)) { num=write(cfd,shead,stail-shead); if ((num==-1) && (errno != EWOULDBLOCK)) return; if (num>0) { shead += num; if (shead == stail) { shead = stail = sbuf; spos = 0; } if (!--nfd) continue; } } } }
participants (2)
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avalon＠coombs.anu.edu.au -
mark＠coombs.anu.edu.au