diff options
Diffstat (limited to 'jslinux-2019-12-21/tinyemu-2019-12-21/slirp/slirp.c')
| -rw-r--r-- | jslinux-2019-12-21/tinyemu-2019-12-21/slirp/slirp.c | 828 |
1 files changed, 828 insertions, 0 deletions
diff --git a/jslinux-2019-12-21/tinyemu-2019-12-21/slirp/slirp.c b/jslinux-2019-12-21/tinyemu-2019-12-21/slirp/slirp.c new file mode 100644 index 0000000..db8c117 --- /dev/null +++ b/jslinux-2019-12-21/tinyemu-2019-12-21/slirp/slirp.c @@ -0,0 +1,828 @@ +/* + * libslirp glue + * + * Copyright (c) 2004-2008 Fabrice Bellard + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ +#include "slirp.h" + +/* host loopback address */ +struct in_addr loopback_addr; + +/* emulated hosts use the MAC addr 52:55:IP:IP:IP:IP */ +static const uint8_t special_ethaddr[6] = { + 0x52, 0x55, 0x00, 0x00, 0x00, 0x00 +}; + +static const uint8_t zero_ethaddr[6] = { 0, 0, 0, 0, 0, 0 }; + +/* XXX: suppress those select globals */ +fd_set *global_readfds, *global_writefds, *global_xfds; + +u_int curtime; +static u_int time_fasttimo, last_slowtimo; +static int do_slowtimo; + +static struct in_addr dns_addr; +static u_int dns_addr_time; + +#ifdef _WIN32 + +int get_dns_addr(struct in_addr *pdns_addr) +{ + FIXED_INFO *FixedInfo=NULL; + ULONG BufLen; + DWORD ret; + IP_ADDR_STRING *pIPAddr; + struct in_addr tmp_addr; + + if (dns_addr.s_addr != 0 && (curtime - dns_addr_time) < 1000) { + *pdns_addr = dns_addr; + return 0; + } + + FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO)); + BufLen = sizeof(FIXED_INFO); + + if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) { + if (FixedInfo) { + GlobalFree(FixedInfo); + FixedInfo = NULL; + } + FixedInfo = GlobalAlloc(GPTR, BufLen); + } + + if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) { + printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret ); + if (FixedInfo) { + GlobalFree(FixedInfo); + FixedInfo = NULL; + } + return -1; + } + + pIPAddr = &(FixedInfo->DnsServerList); + inet_aton(pIPAddr->IpAddress.String, &tmp_addr); + *pdns_addr = tmp_addr; + dns_addr = tmp_addr; + dns_addr_time = curtime; + if (FixedInfo) { + GlobalFree(FixedInfo); + FixedInfo = NULL; + } + return 0; +} + +static void winsock_cleanup(void) +{ + WSACleanup(); +} + +#else + +static struct stat dns_addr_stat; + +int get_dns_addr(struct in_addr *pdns_addr) +{ + char buff[512]; + char buff2[257]; + FILE *f; + int found = 0; + struct in_addr tmp_addr; + + if (dns_addr.s_addr != 0) { + struct stat old_stat; + if ((curtime - dns_addr_time) < 1000) { + *pdns_addr = dns_addr; + return 0; + } + old_stat = dns_addr_stat; + if (stat("/etc/resolv.conf", &dns_addr_stat) != 0) + return -1; + if ((dns_addr_stat.st_dev == old_stat.st_dev) + && (dns_addr_stat.st_ino == old_stat.st_ino) + && (dns_addr_stat.st_size == old_stat.st_size) + && (dns_addr_stat.st_mtime == old_stat.st_mtime)) { + *pdns_addr = dns_addr; + return 0; + } + } + + f = fopen("/etc/resolv.conf", "r"); + if (!f) + return -1; + +#ifdef DEBUG + lprint("IP address of your DNS(s): "); +#endif + while (fgets(buff, 512, f) != NULL) { + if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) { + if (!inet_aton(buff2, &tmp_addr)) + continue; + /* If it's the first one, set it to dns_addr */ + if (!found) { + *pdns_addr = tmp_addr; + dns_addr = tmp_addr; + dns_addr_time = curtime; + } +#ifdef DEBUG + else + lprint(", "); +#endif + if (++found > 3) { +#ifdef DEBUG + lprint("(more)"); +#endif + break; + } +#ifdef DEBUG + else + lprint("%s", inet_ntoa(tmp_addr)); +#endif + } + } + fclose(f); + if (!found) + return -1; + return 0; +} + +#endif + +static void slirp_init_once(void) +{ + static int initialized; +#ifdef _WIN32 + WSADATA Data; +#endif + + if (initialized) { + return; + } + initialized = 1; + +#ifdef _WIN32 + WSAStartup(MAKEWORD(2,0), &Data); + atexit(winsock_cleanup); +#endif + + loopback_addr.s_addr = htonl(INADDR_LOOPBACK); +} + +Slirp *slirp_init(int restricted, struct in_addr vnetwork, + struct in_addr vnetmask, struct in_addr vhost, + const char *vhostname, const char *tftp_path, + const char *bootfile, struct in_addr vdhcp_start, + struct in_addr vnameserver, void *opaque) +{ + Slirp *slirp = mallocz(sizeof(Slirp)); + + slirp_init_once(); + + slirp->restricted = restricted; + + if_init(slirp); + ip_init(slirp); + + /* Initialise mbufs *after* setting the MTU */ + m_init(slirp); + + slirp->vnetwork_addr = vnetwork; + slirp->vnetwork_mask = vnetmask; + slirp->vhost_addr = vhost; + if (vhostname) { + pstrcpy(slirp->client_hostname, sizeof(slirp->client_hostname), + vhostname); + } + if (tftp_path) { + slirp->tftp_prefix = strdup(tftp_path); + } + if (bootfile) { + slirp->bootp_filename = strdup(bootfile); + } + slirp->vdhcp_startaddr = vdhcp_start; + slirp->vnameserver_addr = vnameserver; + + slirp->opaque = opaque; + + return slirp; +} + +void slirp_cleanup(Slirp *slirp) +{ + free(slirp->tftp_prefix); + free(slirp->bootp_filename); + free(slirp); +} + +#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED) +#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED) +#define UPD_NFDS(x) if (nfds < (x)) nfds = (x) + +void slirp_select_fill(Slirp *slirp, int *pnfds, + fd_set *readfds, fd_set *writefds, fd_set *xfds) +{ + struct socket *so, *so_next; + int nfds; + + /* fail safe */ + global_readfds = NULL; + global_writefds = NULL; + global_xfds = NULL; + + nfds = *pnfds; + /* + * First, TCP sockets + */ + do_slowtimo = 0; + + { + /* + * *_slowtimo needs calling if there are IP fragments + * in the fragment queue, or there are TCP connections active + */ + do_slowtimo |= ((slirp->tcb.so_next != &slirp->tcb) || + (&slirp->ipq.ip_link != slirp->ipq.ip_link.next)); + + for (so = slirp->tcb.so_next; so != &slirp->tcb; + so = so_next) { + so_next = so->so_next; + + /* + * See if we need a tcp_fasttimo + */ + if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK) + time_fasttimo = curtime; /* Flag when we want a fasttimo */ + + /* + * NOFDREF can include still connecting to local-host, + * newly socreated() sockets etc. Don't want to select these. + */ + if (so->so_state & SS_NOFDREF || so->s == -1) + continue; + + /* + * Set for reading sockets which are accepting + */ + if (so->so_state & SS_FACCEPTCONN) { + FD_SET(so->s, readfds); + UPD_NFDS(so->s); + continue; + } + + /* + * Set for writing sockets which are connecting + */ + if (so->so_state & SS_ISFCONNECTING) { + FD_SET(so->s, writefds); + UPD_NFDS(so->s); + continue; + } + + /* + * Set for writing if we are connected, can send more, and + * we have something to send + */ + if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) { + FD_SET(so->s, writefds); + UPD_NFDS(so->s); + } + + /* + * Set for reading (and urgent data) if we are connected, can + * receive more, and we have room for it XXX /2 ? + */ + if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) { + FD_SET(so->s, readfds); + FD_SET(so->s, xfds); + UPD_NFDS(so->s); + } + } + + /* + * UDP sockets + */ + for (so = slirp->udb.so_next; so != &slirp->udb; + so = so_next) { + so_next = so->so_next; + + /* + * See if it's timed out + */ + if (so->so_expire) { + if (so->so_expire <= curtime) { + udp_detach(so); + continue; + } else + do_slowtimo = 1; /* Let socket expire */ + } + + /* + * When UDP packets are received from over the + * link, they're sendto()'d straight away, so + * no need for setting for writing + * Limit the number of packets queued by this session + * to 4. Note that even though we try and limit this + * to 4 packets, the session could have more queued + * if the packets needed to be fragmented + * (XXX <= 4 ?) + */ + if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) { + FD_SET(so->s, readfds); + UPD_NFDS(so->s); + } + } + } + + *pnfds = nfds; +} + +void slirp_select_poll(Slirp *slirp, + fd_set *readfds, fd_set *writefds, fd_set *xfds, + int select_error) +{ + struct socket *so, *so_next; + int ret; + + global_readfds = readfds; + global_writefds = writefds; + global_xfds = xfds; + + curtime = os_get_time_ms(); + + { + /* + * See if anything has timed out + */ + if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) { + tcp_fasttimo(slirp); + time_fasttimo = 0; + } + if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) { + ip_slowtimo(slirp); + tcp_slowtimo(slirp); + last_slowtimo = curtime; + } + + /* + * Check sockets + */ + if (!select_error) { + /* + * Check TCP sockets + */ + for (so = slirp->tcb.so_next; so != &slirp->tcb; + so = so_next) { + so_next = so->so_next; + + /* + * FD_ISSET is meaningless on these sockets + * (and they can crash the program) + */ + if (so->so_state & SS_NOFDREF || so->s == -1) + continue; + + /* + * Check for URG data + * This will soread as well, so no need to + * test for readfds below if this succeeds + */ + if (FD_ISSET(so->s, xfds)) + sorecvoob(so); + /* + * Check sockets for reading + */ + else if (FD_ISSET(so->s, readfds)) { + /* + * Check for incoming connections + */ + if (so->so_state & SS_FACCEPTCONN) { + tcp_connect(so); + continue; + } /* else */ + ret = soread(so); + + /* Output it if we read something */ + if (ret > 0) + tcp_output(sototcpcb(so)); + } + + /* + * Check sockets for writing + */ + if (FD_ISSET(so->s, writefds)) { + /* + * Check for non-blocking, still-connecting sockets + */ + if (so->so_state & SS_ISFCONNECTING) { + /* Connected */ + so->so_state &= ~SS_ISFCONNECTING; + + ret = send(so->s, (const void *) &ret, 0, 0); + if (ret < 0) { + /* XXXXX Must fix, zero bytes is a NOP */ + if (errno == EAGAIN || errno == EWOULDBLOCK || + errno == EINPROGRESS || errno == ENOTCONN) + continue; + + /* else failed */ + so->so_state &= SS_PERSISTENT_MASK; + so->so_state |= SS_NOFDREF; + } + /* else so->so_state &= ~SS_ISFCONNECTING; */ + + /* + * Continue tcp_input + */ + tcp_input((struct mbuf *)NULL, sizeof(struct ip), so); + /* continue; */ + } else + ret = sowrite(so); + /* + * XXXXX If we wrote something (a lot), there + * could be a need for a window update. + * In the worst case, the remote will send + * a window probe to get things going again + */ + } + + /* + * Probe a still-connecting, non-blocking socket + * to check if it's still alive + */ +#ifdef PROBE_CONN + if (so->so_state & SS_ISFCONNECTING) { + ret = recv(so->s, (char *)&ret, 0,0); + + if (ret < 0) { + /* XXX */ + if (errno == EAGAIN || errno == EWOULDBLOCK || + errno == EINPROGRESS || errno == ENOTCONN) + continue; /* Still connecting, continue */ + + /* else failed */ + so->so_state &= SS_PERSISTENT_MASK; + so->so_state |= SS_NOFDREF; + + /* tcp_input will take care of it */ + } else { + ret = send(so->s, &ret, 0,0); + if (ret < 0) { + /* XXX */ + if (errno == EAGAIN || errno == EWOULDBLOCK || + errno == EINPROGRESS || errno == ENOTCONN) + continue; + /* else failed */ + so->so_state &= SS_PERSISTENT_MASK; + so->so_state |= SS_NOFDREF; + } else + so->so_state &= ~SS_ISFCONNECTING; + + } + tcp_input((struct mbuf *)NULL, sizeof(struct ip),so); + } /* SS_ISFCONNECTING */ +#endif + } + + /* + * Now UDP sockets. + * Incoming packets are sent straight away, they're not buffered. + * Incoming UDP data isn't buffered either. + */ + for (so = slirp->udb.so_next; so != &slirp->udb; + so = so_next) { + so_next = so->so_next; + + if (so->s != -1 && FD_ISSET(so->s, readfds)) { + sorecvfrom(so); + } + } + } + + /* + * See if we can start outputting + */ + if (slirp->if_queued) { + if_start(slirp); + } + } + + /* clear global file descriptor sets. + * these reside on the stack in vl.c + * so they're unusable if we're not in + * slirp_select_fill or slirp_select_poll. + */ + global_readfds = NULL; + global_writefds = NULL; + global_xfds = NULL; +} + +#define ETH_ALEN 6 +#define ETH_HLEN 14 + +#define ETH_P_IP 0x0800 /* Internet Protocol packet */ +#define ETH_P_ARP 0x0806 /* Address Resolution packet */ + +#define ARPOP_REQUEST 1 /* ARP request */ +#define ARPOP_REPLY 2 /* ARP reply */ + +struct ethhdr +{ + unsigned char h_dest[ETH_ALEN]; /* destination eth addr */ + unsigned char h_source[ETH_ALEN]; /* source ether addr */ + unsigned short h_proto; /* packet type ID field */ +}; + +struct arphdr +{ + unsigned short ar_hrd; /* format of hardware address */ + unsigned short ar_pro; /* format of protocol address */ + unsigned char ar_hln; /* length of hardware address */ + unsigned char ar_pln; /* length of protocol address */ + unsigned short ar_op; /* ARP opcode (command) */ + + /* + * Ethernet looks like this : This bit is variable sized however... + */ + unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */ + uint32_t ar_sip; /* sender IP address */ + unsigned char ar_tha[ETH_ALEN]; /* target hardware address */ + uint32_t ar_tip ; /* target IP address */ +} __attribute__((packed)); + +static void arp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len) +{ + struct ethhdr *eh = (struct ethhdr *)pkt; + struct arphdr *ah = (struct arphdr *)(pkt + ETH_HLEN); + uint8_t arp_reply[max(ETH_HLEN + sizeof(struct arphdr), 64)]; + struct ethhdr *reh = (struct ethhdr *)arp_reply; + struct arphdr *rah = (struct arphdr *)(arp_reply + ETH_HLEN); + int ar_op; + struct ex_list *ex_ptr; + + ar_op = ntohs(ah->ar_op); + switch(ar_op) { + case ARPOP_REQUEST: + if ((ah->ar_tip & slirp->vnetwork_mask.s_addr) == + slirp->vnetwork_addr.s_addr) { + if (ah->ar_tip == slirp->vnameserver_addr.s_addr || + ah->ar_tip == slirp->vhost_addr.s_addr) + goto arp_ok; + for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) { + if (ex_ptr->ex_addr.s_addr == ah->ar_tip) + goto arp_ok; + } + return; + arp_ok: + memset(arp_reply, 0, sizeof(arp_reply)); + /* XXX: make an ARP request to have the client address */ + memcpy(slirp->client_ethaddr, eh->h_source, ETH_ALEN); + + /* ARP request for alias/dns mac address */ + memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN); + memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4); + memcpy(&reh->h_source[2], &ah->ar_tip, 4); + reh->h_proto = htons(ETH_P_ARP); + + rah->ar_hrd = htons(1); + rah->ar_pro = htons(ETH_P_IP); + rah->ar_hln = ETH_ALEN; + rah->ar_pln = 4; + rah->ar_op = htons(ARPOP_REPLY); + memcpy(rah->ar_sha, reh->h_source, ETH_ALEN); + rah->ar_sip = ah->ar_tip; + memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN); + rah->ar_tip = ah->ar_sip; + slirp_output(slirp->opaque, arp_reply, sizeof(arp_reply)); + } + break; + case ARPOP_REPLY: + /* reply to request of client mac address ? */ + if (!memcmp(slirp->client_ethaddr, zero_ethaddr, ETH_ALEN) && + ah->ar_sip == slirp->client_ipaddr.s_addr) { + memcpy(slirp->client_ethaddr, ah->ar_sha, ETH_ALEN); + } + break; + default: + break; + } +} + +void slirp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len) +{ + struct mbuf *m; + int proto; + + if (pkt_len < ETH_HLEN) + return; + + proto = ntohs(*(uint16_t *)(pkt + 12)); + switch(proto) { + case ETH_P_ARP: + arp_input(slirp, pkt, pkt_len); + break; + case ETH_P_IP: + m = m_get(slirp); + if (!m) + return; + /* Note: we add to align the IP header */ + if (M_FREEROOM(m) < pkt_len + 2) { + m_inc(m, pkt_len + 2); + } + m->m_len = pkt_len + 2; + memcpy(m->m_data + 2, pkt, pkt_len); + + m->m_data += 2 + ETH_HLEN; + m->m_len -= 2 + ETH_HLEN; + + ip_input(m); + break; + default: + break; + } +} + +/* output the IP packet to the ethernet device */ +void if_encap(Slirp *slirp, const uint8_t *ip_data, int ip_data_len) +{ + uint8_t buf[1600]; + struct ethhdr *eh = (struct ethhdr *)buf; + + if (ip_data_len + ETH_HLEN > sizeof(buf)) + return; + + if (!memcmp(slirp->client_ethaddr, zero_ethaddr, ETH_ALEN)) { + uint8_t arp_req[ETH_HLEN + sizeof(struct arphdr)]; + struct ethhdr *reh = (struct ethhdr *)arp_req; + struct arphdr *rah = (struct arphdr *)(arp_req + ETH_HLEN); + const struct ip *iph = (const struct ip *)ip_data; + + /* If the client addr is not known, there is no point in + sending the packet to it. Normally the sender should have + done an ARP request to get its MAC address. Here we do it + in place of sending the packet and we hope that the sender + will retry sending its packet. */ + memset(reh->h_dest, 0xff, ETH_ALEN); + memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4); + memcpy(&reh->h_source[2], &slirp->vhost_addr, 4); + reh->h_proto = htons(ETH_P_ARP); + rah->ar_hrd = htons(1); + rah->ar_pro = htons(ETH_P_IP); + rah->ar_hln = ETH_ALEN; + rah->ar_pln = 4; + rah->ar_op = htons(ARPOP_REQUEST); + /* source hw addr */ + memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN - 4); + memcpy(&rah->ar_sha[2], &slirp->vhost_addr, 4); + /* source IP */ + rah->ar_sip = slirp->vhost_addr.s_addr; + /* target hw addr (none) */ + memset(rah->ar_tha, 0, ETH_ALEN); + /* target IP */ + rah->ar_tip = iph->ip_dst.s_addr; + slirp->client_ipaddr = iph->ip_dst; + slirp_output(slirp->opaque, arp_req, sizeof(arp_req)); + } else { + memcpy(eh->h_dest, slirp->client_ethaddr, ETH_ALEN); + memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 4); + /* XXX: not correct */ + memcpy(&eh->h_source[2], &slirp->vhost_addr, 4); + eh->h_proto = htons(ETH_P_IP); + memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len); + slirp_output(slirp->opaque, buf, ip_data_len + ETH_HLEN); + } +} + +/* Drop host forwarding rule, return 0 if found. */ +int slirp_remove_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr, + int host_port) +{ + struct socket *so; + struct socket *head = (is_udp ? &slirp->udb : &slirp->tcb); + struct sockaddr_in addr; + int port = htons(host_port); + socklen_t addr_len; + + for (so = head->so_next; so != head; so = so->so_next) { + addr_len = sizeof(addr); + if ((so->so_state & SS_HOSTFWD) && + getsockname(so->s, (struct sockaddr *)&addr, &addr_len) == 0 && + addr.sin_addr.s_addr == host_addr.s_addr && + addr.sin_port == port) { + close(so->s); + sofree(so); + return 0; + } + } + + return -1; +} + +int slirp_add_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr, + int host_port, struct in_addr guest_addr, int guest_port) +{ + if (!guest_addr.s_addr) { + guest_addr = slirp->vdhcp_startaddr; + } + if (is_udp) { + if (!udp_listen(slirp, host_addr.s_addr, htons(host_port), + guest_addr.s_addr, htons(guest_port), SS_HOSTFWD)) + return -1; + } else { + if (!tcp_listen(slirp, host_addr.s_addr, htons(host_port), + guest_addr.s_addr, htons(guest_port), SS_HOSTFWD)) + return -1; + } + return 0; +} + +int slirp_add_exec(Slirp *slirp, int do_pty, const void *args, + struct in_addr *guest_addr, int guest_port) +{ + if (!guest_addr->s_addr) { + guest_addr->s_addr = slirp->vnetwork_addr.s_addr | + (htonl(0x0204) & ~slirp->vnetwork_mask.s_addr); + } + if ((guest_addr->s_addr & slirp->vnetwork_mask.s_addr) != + slirp->vnetwork_addr.s_addr || + guest_addr->s_addr == slirp->vhost_addr.s_addr || + guest_addr->s_addr == slirp->vnameserver_addr.s_addr) { + return -1; + } + return add_exec(&slirp->exec_list, do_pty, (char *)args, *guest_addr, + htons(guest_port)); +} + +ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags) +{ +#if 0 + if (so->s == -1 && so->extra) { + qemu_chr_write(so->extra, buf, len); + return len; + } +#endif + return send(so->s, buf, len, flags); +} + +static struct socket * +slirp_find_ctl_socket(Slirp *slirp, struct in_addr guest_addr, int guest_port) +{ + struct socket *so; + + for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) { + if (so->so_faddr.s_addr == guest_addr.s_addr && + htons(so->so_fport) == guest_port) { + return so; + } + } + return NULL; +} + +size_t slirp_socket_can_recv(Slirp *slirp, struct in_addr guest_addr, + int guest_port) +{ + struct iovec iov[2]; + struct socket *so; + + so = slirp_find_ctl_socket(slirp, guest_addr, guest_port); + + if (!so || so->so_state & SS_NOFDREF) + return 0; + + if (!CONN_CANFRCV(so) || so->so_snd.sb_cc >= (so->so_snd.sb_datalen/2)) + return 0; + + return sopreprbuf(so, iov, NULL); +} + +void slirp_socket_recv(Slirp *slirp, struct in_addr guest_addr, int guest_port, + const uint8_t *buf, int size) +{ + int ret; + struct socket *so = slirp_find_ctl_socket(slirp, guest_addr, guest_port); + + if (!so) + return; + + ret = soreadbuf(so, (const char *)buf, size); + + if (ret > 0) + tcp_output(sototcpcb(so)); +} |