diff options
Diffstat (limited to 'slirp/udp.c')
| -rw-r--r-- | slirp/udp.c | 699 |
1 files changed, 0 insertions, 699 deletions
diff --git a/slirp/udp.c b/slirp/udp.c deleted file mode 100644 index d96251d..0000000 --- a/slirp/udp.c +++ /dev/null @@ -1,699 +0,0 @@ -/* - * Copyright (c) 1982, 1986, 1988, 1990, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94 - * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp - */ - -/* - * Changes and additions relating to SLiRP - * Copyright (c) 1995 Danny Gasparovski. - * - * Please read the file COPYRIGHT for the - * terms and conditions of the copyright. - */ - -#include <slirp.h> -#include "ip_icmp.h" - -struct udpstat udpstat; - -struct socket udb; - -/* - * UDP protocol implementation. - * Per RFC 768, August, 1980. - */ -#ifndef COMPAT_42 -int udpcksum = 1; -#else -int udpcksum = 0; /* XXX */ -#endif - -struct socket *udp_last_so = &udb; - -void -udp_init() -{ - udb.so_next = udb.so_prev = &udb; -} -/* m->m_data points at ip packet header - * m->m_len length ip packet - * ip->ip_len length data (IPDU) - */ -void -udp_input(m, iphlen) - register MBuf m; - int iphlen; -{ - register struct ip *ip; - register struct udphdr *uh; -/* MBuf opts = 0;*/ - int len; - struct ip save_ip; - struct socket *so; - - DEBUG_CALL("udp_input"); - DEBUG_ARG("m = %lx", (long)m); - DEBUG_ARG("iphlen = %d", iphlen); - - udpstat.udps_ipackets++; - - /* - * Strip IP options, if any; should skip this, - * make available to user, and use on returned packets, - * but we don't yet have a way to check the checksum - * with options still present. - */ - if(iphlen > sizeof(struct ip)) { - ip_stripoptions(m, (MBuf )0); - iphlen = sizeof(struct ip); - } - - /* - * Get IP and UDP header together in first mbuf. - */ - ip = MBUF_TO(m, struct ip *); - uh = (struct udphdr *)((caddr_t)ip + iphlen); - - /* - * Make mbuf data length reflect UDP length. - * If not enough data to reflect UDP length, drop. - */ - len = ntohs((u_int16_t)uh->uh_ulen); - - if (ip->ip_len != len) { - if (len > ip->ip_len) { - udpstat.udps_badlen++; - goto bad; - } - mbuf_trim(m, len - ip->ip_len); - ip->ip_len = len; - } - - /* - * Save a copy of the IP header in case we want restore it - * for sending an ICMP error message in response. - */ - save_ip = *ip; - save_ip.ip_len+= iphlen; /* tcp_input subtracts this */ - - /* - * Checksum extended UDP header and data. - */ - if (udpcksum && uh->uh_sum) { - ((struct ipovly *)ip)->ih_next = 0; - ((struct ipovly *)ip)->ih_prev = 0; - ((struct ipovly *)ip)->ih_x1 = 0; - ((struct ipovly *)ip)->ih_len = uh->uh_ulen; - /* keep uh_sum for ICMP reply - * uh->uh_sum = cksum(m, len + sizeof (struct ip)); - * if (uh->uh_sum) { - */ - if(cksum(m, len + sizeof(struct ip))) { - udpstat.udps_badsum++; - goto bad; - } - } - - /* - * handle DHCP/BOOTP - */ - if (ntohs(uh->uh_dport) == BOOTP_SERVER) { - bootp_input(m); - goto bad; - } - - /* - * handle TFTP - */ - if (ntohs(uh->uh_dport) == TFTP_SERVER) { - tftp_input(m); - goto bad; - } - - /* - * Locate pcb for datagram. - */ - so = udp_last_so; - if (so->so_lport != uh->uh_sport || - so->so_laddr.s_addr != ip->ip_src.s_addr) { - struct socket *tmp; - - for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) { - if (tmp->so_lport == uh->uh_sport && - tmp->so_laddr.s_addr == ip->ip_src.s_addr) { - tmp->so_faddr.s_addr = ip->ip_dst.s_addr; - tmp->so_fport = uh->uh_dport; - so = tmp; - break; - } - } - if (tmp == &udb) { - so = NULL; - } else { - udpstat.udpps_pcbcachemiss++; - udp_last_so = so; - } - } - - if (so == NULL) { - /* - * If there's no socket for this packet, - * create one - */ - if ((so = socreate()) == NULL) goto bad; - if(udp_attach(so) == -1) { - DEBUG_MISC((dfd," udp_attach errno = %d-%s\n", - errno,strerror(errno))); - sofree(so); - goto bad; - } - - /* - * Setup fields - */ - /* udp_last_so = so; */ - so->so_laddr = ip->ip_src; - so->so_lport = uh->uh_sport; - - if ((so->so_iptos = udp_tos(so)) == 0) - so->so_iptos = ip->ip_tos; - - /* - * XXXXX Here, check if it's in udpexec_list, - * and if it is, do the fork_exec() etc. - */ - } - - so->so_faddr = ip->ip_dst; /* XXX */ - so->so_fport = uh->uh_dport; /* XXX */ - - iphlen += sizeof(struct udphdr); - m->m_len -= iphlen; - m->m_data += iphlen; - - /* - * Now we sendto() the packet. - */ - if (so->so_emu) - udp_emu(so, m); - - if(sosendto(so,m) == -1) { - m->m_len += iphlen; - m->m_data -= iphlen; - *ip=save_ip; - DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno))); - icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno)); - } - - mbuf_free(so->so_m); /* used for ICMP if error on sorecvfrom */ - - /* restore the orig mbuf packet */ - m->m_len += iphlen; - m->m_data -= iphlen; - *ip=save_ip; - so->so_m=m; /* ICMP backup */ - - return; -bad: - mbuf_free(m); - /* if (opts) mbuf_free(opts); */ - return; -} - -int udp_output2(struct socket *so, MBuf m, - struct sockaddr_in *saddr, struct sockaddr_in *daddr, - int iptos) -{ - register struct udpiphdr *ui; - int error = 0; - - DEBUG_CALL("udp_output"); - DEBUG_ARG("so = %lx", (long)so); - DEBUG_ARG("m = %lx", (long)m); - DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr); - DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr); - - /* - * Adjust for header - */ - m->m_data -= sizeof(struct udpiphdr); - m->m_len += sizeof(struct udpiphdr); - - /* - * Fill in mbuf with extended UDP header - * and addresses and length put into network format. - */ - ui = MBUF_TO(m, struct udpiphdr *); - ui->ui_next = ui->ui_prev = 0; - ui->ui_x1 = 0; - ui->ui_pr = IPPROTO_UDP; - ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */ - /* XXXXX Check for from-one-location sockets, or from-any-location sockets */ - ui->ui_src = saddr->sin_addr; - ui->ui_dst = daddr->sin_addr; - ui->ui_sport = saddr->sin_port; - ui->ui_dport = daddr->sin_port; - ui->ui_ulen = ui->ui_len; - - /* - * Stuff checksum and output datagram. - */ - ui->ui_sum = 0; - if (udpcksum) { - if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0) - ui->ui_sum = 0xffff; - } - ((struct ip *)ui)->ip_len = m->m_len; - - ((struct ip *)ui)->ip_ttl = ip_defttl; - ((struct ip *)ui)->ip_tos = iptos; - - udpstat.udps_opackets++; - - error = ip_output(so, m); - - return (error); -} - -int udp_output(struct socket *so, MBuf m, - struct sockaddr_in *addr) - -{ - struct sockaddr_in saddr, daddr; - - saddr = *addr; - if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) { - saddr.sin_addr.s_addr = so->so_faddr.s_addr; - if ((so->so_faddr.s_addr & htonl(0x000000ff)) == htonl(0xff)) - saddr.sin_addr.s_addr = alias_addr.s_addr; - } - daddr.sin_addr = so->so_laddr; - daddr.sin_port = so->so_lport; - - return udp_output2(so, m, &saddr, &daddr, so->so_iptos); -} - -int -udp_attach(so) - struct socket *so; -{ - struct sockaddr_in addr; - - if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) { - /* - * Here, we bind() the socket. Although not really needed - * (sendto() on an unbound socket will bind it), it's done - * here so that emulation of ytalk etc. don't have to do it - */ - addr.sin_family = AF_INET; - addr.sin_port = 0; - addr.sin_addr.s_addr = INADDR_ANY; - if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) { - int lasterrno=errno; - closesocket(so->s); - so->s=-1; -#ifdef _WIN32 - WSASetLastError(lasterrno); -#else - errno=lasterrno; -#endif - } else { - /* success, insert in queue */ - so->so_expire = curtime + SO_EXPIRE; - insque(so,&udb); - } - } - return(so->s); -} - -void -udp_detach(so) - struct socket *so; -{ - closesocket(so->s); - /* if (so->so_m) mbuf_free(so->so_m); done by sofree */ - - sofree(so); -} - -struct tos_t udptos[] = { - {0, 53, IPTOS_LOWDELAY, 0}, /* DNS */ - {517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */ - {518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */ - {0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */ - {0, 0, 0, 0} -}; - -u_int8_t -udp_tos(so) - struct socket *so; -{ - int i = 0; - - while(udptos[i].tos) { - if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) || - (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) { - so->so_emu = udptos[i].emu; - return udptos[i].tos; - } - i++; - } - - return 0; -} - -#ifdef EMULATE_TALK -#include "talkd.h" -#endif - -/* - * Here, talk/ytalk/ntalk requests must be emulated - */ -void -udp_emu(so, m) - struct socket *so; - MBuf m; -{ - struct sockaddr_in addr; - int addrlen = sizeof(addr); -#ifdef EMULATE_TALK - CTL_MSG_OLD *omsg; - CTL_MSG *nmsg; - char buff[sizeof(CTL_MSG)]; - u_char type; - -struct talk_request { - struct talk_request *next; - struct socket *udp_so; - struct socket *tcp_so; -} *req; - - static struct talk_request *req_tbl = 0; - -#endif - -struct cu_header { - uint16_t d_family; // destination family - uint16_t d_port; // destination port - uint32_t d_addr; // destination address - uint16_t s_family; // source family - uint16_t s_port; // source port - uint32_t so_addr; // source address - uint32_t seqn; // sequence number - uint16_t message; // message - uint16_t data_type; // data type - uint16_t pkt_len; // packet length -} *cu_head; - - switch(so->so_emu) { - -#ifdef EMULATE_TALK - case EMU_TALK: - case EMU_NTALK: - /* - * Talk emulation. We always change the ctl_addr to get - * some answers from the daemon. When an ANNOUNCE comes, - * we send LEAVE_INVITE to the local daemons. Also when a - * DELETE comes, we send copies to the local daemons. - */ - if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) - return; - -#define IS_OLD (so->so_emu == EMU_TALK) - -#define COPY_MSG(dest, src) { dest->type = src->type; \ - dest->id_num = src->id_num; \ - dest->pid = src->pid; \ - dest->addr = src->addr; \ - dest->ctl_addr = src->ctl_addr; \ - memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \ - memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \ - memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); } - -#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field) -/* old_sockaddr to sockaddr_in */ - - - if (IS_OLD) { /* old talk */ - omsg = MBUF_TO(m, CTL_MSG_OLD*); - nmsg = (CTL_MSG *) buff; - type = omsg->type; - OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port; - OTOSIN(omsg, ctl_addr)->sin_addr = our_addr; - strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD); - } else { /* new talk */ - omsg = (CTL_MSG_OLD *) buff; - nmsg = MBUF_TO(m, CTL_MSG *); - type = nmsg->type; - OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port; - OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr; - strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD); - } - - if (type == LOOK_UP) - return; /* for LOOK_UP this is enough */ - - if (IS_OLD) { /* make a copy of the message */ - COPY_MSG(nmsg, omsg); - nmsg->vers = 1; - nmsg->answer = 0; - } else - COPY_MSG(omsg, nmsg); - - /* - * If if is an ANNOUNCE message, we go through the - * request table to see if a tcp port has already - * been redirected for this socket. If not, we solisten() - * a new socket and add this entry to the table. - * The port number of the tcp socket and our IP - * are put to the addr field of the message structures. - * Then a LEAVE_INVITE is sent to both local daemon - * ports, 517 and 518. This is why we have two copies - * of the message, one in old talk and one in new talk - * format. - */ - - if (type == ANNOUNCE) { - int s; - u_short temp_port; - - for(req = req_tbl; req; req = req->next) - if (so == req->udp_so) - break; /* found it */ - - if (!req) { /* no entry for so, create new */ - req = (struct talk_request *) - malloc(sizeof(struct talk_request)); - req->udp_so = so; - req->tcp_so = solisten(0, - OTOSIN(omsg, addr)->sin_addr.s_addr, - OTOSIN(omsg, addr)->sin_port, - SS_FACCEPTONCE); - req->next = req_tbl; - req_tbl = req; - } - - /* replace port number in addr field */ - addrlen = sizeof(addr); - getsockname(req->tcp_so->s, - (struct sockaddr *) &addr, - &addrlen); - OTOSIN(omsg, addr)->sin_port = addr.sin_port; - OTOSIN(omsg, addr)->sin_addr = our_addr; - OTOSIN(nmsg, addr)->sin_port = addr.sin_port; - OTOSIN(nmsg, addr)->sin_addr = our_addr; - - /* send LEAVE_INVITEs */ - temp_port = OTOSIN(omsg, ctl_addr)->sin_port; - OTOSIN(omsg, ctl_addr)->sin_port = 0; - OTOSIN(nmsg, ctl_addr)->sin_port = 0; - omsg->type = nmsg->type = LEAVE_INVITE; - - s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); - addr.sin_addr = our_addr; - addr.sin_family = AF_INET; - addr.sin_port = htons(517); - sendto(s, (char *)omsg, sizeof(*omsg), 0, - (struct sockaddr *)&addr, sizeof(addr)); - addr.sin_port = htons(518); - sendto(s, (char *)nmsg, sizeof(*nmsg), 0, - (struct sockaddr *) &addr, sizeof(addr)); - closesocket(s) ; - - omsg->type = nmsg->type = ANNOUNCE; - OTOSIN(omsg, ctl_addr)->sin_port = temp_port; - OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; - } - - /* - * If it is a DELETE message, we send a copy to the - * local daemons. Then we delete the entry corresponding - * to our socket from the request table. - */ - - if (type == DELETE) { - struct talk_request *temp_req, *req_next; - int s; - u_short temp_port; - - temp_port = OTOSIN(omsg, ctl_addr)->sin_port; - OTOSIN(omsg, ctl_addr)->sin_port = 0; - OTOSIN(nmsg, ctl_addr)->sin_port = 0; - - s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); - addr.sin_addr = our_addr; - addr.sin_family = AF_INET; - addr.sin_port = htons(517); - sendto(s, (char *)omsg, sizeof(*omsg), 0, - (struct sockaddr *)&addr, sizeof(addr)); - addr.sin_port = htons(518); - sendto(s, (char *)nmsg, sizeof(*nmsg), 0, - (struct sockaddr *)&addr, sizeof(addr)); - closesocket(s); - - OTOSIN(omsg, ctl_addr)->sin_port = temp_port; - OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; - - /* delete table entry */ - if (so == req_tbl->udp_so) { - temp_req = req_tbl; - req_tbl = req_tbl->next; - free(temp_req); - } else { - temp_req = req_tbl; - for(req = req_tbl->next; req; req = req_next) { - req_next = req->next; - if (so == req->udp_so) { - temp_req->next = req_next; - free(req); - break; - } else { - temp_req = req; - } - } - } - } - - return; -#endif - - case EMU_CUSEEME: - - /* - * Cu-SeeMe emulation. - * Hopefully the packet is more that 16 bytes long. We don't - * do any other tests, just replace the address and port - * fields. - */ - if (m->m_len >= sizeof (*cu_head)) { - if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) - return; - cu_head = MBUF_TO(m, struct cu_header *); - cu_head->s_port = addr.sin_port; - cu_head->so_addr = our_addr.s_addr; - } - - return; - } -} - -struct socket * -udp_listen(port, laddr, lport, flags) - u_int port; - u_int32_t laddr; - u_int lport; - int flags; -{ - struct sockaddr_in addr; - struct socket *so; - int addrlen = sizeof(struct sockaddr_in); - - if ((so = socreate()) == NULL) { - free(so); - return NULL; - } - so->s = socket(AF_INET,SOCK_DGRAM,0); - so->so_expire = curtime + SO_EXPIRE; - so->so_hport = port; - insque(so,&udb); - - addr.sin_family = AF_INET; - addr.sin_addr.s_addr = INADDR_ANY; - addr.sin_port = port; - - if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) { - udp_detach(so); - return NULL; - } - socket_set_xreuseaddr(so->s); - - getsockname(so->s,(struct sockaddr *)&addr,&addrlen); - so->so_fport = addr.sin_port; - if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr) - so->so_faddr = alias_addr; - else - so->so_faddr = addr.sin_addr; - - so->so_lport = lport; - so->so_laddr.s_addr = laddr; - if (flags != SS_FACCEPTONCE) - so->so_expire = 0; - - so->so_state = SS_ISFCONNECTED; - - return so; -} - -int udp_unlisten (u_int port) -{ - struct socket *so; - - for (so = udb.so_next; so != &udb; so = so->so_next) { - if (so->so_hport == htons(port)) { - break; - } - } - - if (so == &udb) - return -1; - - sofcantrcvmore( so ); - sofcantsendmore( so ); - close( so->s ); - so->s = -1; - sofree( so ); - return 0; -} - - |