diff options
Diffstat (limited to 'UNIX/UXNET.C')
| -rw-r--r-- | UNIX/UXNET.C | 1761 |
1 files changed, 0 insertions, 1761 deletions
diff --git a/UNIX/UXNET.C b/UNIX/UXNET.C deleted file mode 100644 index bd6ebb1d..00000000 --- a/UNIX/UXNET.C +++ /dev/null @@ -1,1761 +0,0 @@ -/* - * Unix networking abstraction. - */ - -#include <stdio.h> -#include <stdlib.h> -#include <assert.h> -#include <errno.h> -#include <fcntl.h> -#include <unistd.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <sys/ioctl.h> -#include <arpa/inet.h> -#include <netinet/in.h> -#include <netinet/tcp.h> -#include <netdb.h> -#include <sys/un.h> -#include <pwd.h> -#include <grp.h> - -#include "putty.h" -#include "network.h" -#include "tree234.h" - -/* Solaris needs <sys/sockio.h> for SIOCATMARK. */ -#ifndef SIOCATMARK -#include <sys/sockio.h> -#endif - -#ifndef X11_UNIX_PATH -# define X11_UNIX_PATH "/tmp/.X11-unix/X" -#endif - -/* - * Access to sockaddr types without breaking C strict aliasing rules. - */ -union sockaddr_union { - struct sockaddr_storage storage; - struct sockaddr sa; - struct sockaddr_in sin; -#ifndef NO_IPV6 - struct sockaddr_in6 sin6; -#endif - struct sockaddr_un su; -}; - -/* - * Mutable state that goes with a SockAddr: stores information - * about where in the list of candidate IP(v*) addresses we've - * currently got to. - */ -typedef struct SockAddrStep_tag SockAddrStep; -struct SockAddrStep_tag { -#ifndef NO_IPV6 - struct addrinfo *ai; /* steps along addr->ais */ -#endif - int curraddr; -}; - -typedef struct NetSocket NetSocket; -struct NetSocket { - const char *error; - int s; - Plug *plug; - bufchain output_data; - bool connected; /* irrelevant for listening sockets */ - bool writable; - bool frozen; /* this causes readability notifications to be ignored */ - bool localhost_only; /* for listening sockets */ - char oobdata[1]; - size_t sending_oob; - bool oobpending; /* is there OOB data available to read? */ - bool oobinline; - enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof; - bool incomingeof; - int pending_error; /* in case send() returns error */ - bool listener; - bool nodelay, keepalive; /* for connect()-type sockets */ - bool privport; - int port; /* and again */ - SockAddr *addr; - SockAddrStep step; - /* - * We sometimes need pairs of Socket structures to be linked: - * if we are listening on the same IPv6 and v4 port, for - * example. So here we define `parent' and `child' pointers to - * track this link. - */ - NetSocket *parent, *child; - - Socket sock; -}; - -struct SockAddr { - int refcount; - const char *error; - enum { UNRESOLVED, UNIX, IP } superfamily; -#ifndef NO_IPV6 - struct addrinfo *ais; /* Addresses IPv6 style. */ -#else - unsigned long *addresses; /* Addresses IPv4 style. */ - int naddresses; -#endif - char hostname[512]; /* Store an unresolved host name. */ -}; - -/* - * Which address family this address belongs to. AF_INET for IPv4; - * AF_INET6 for IPv6; AF_UNSPEC indicates that name resolution has - * not been done and a simple host name is held in this SockAddr - * structure. - */ -#ifndef NO_IPV6 -#define SOCKADDR_FAMILY(addr, step) \ - ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \ - (addr)->superfamily == UNIX ? AF_UNIX : \ - (step).ai ? (step).ai->ai_family : AF_INET) -#else -/* Here we gratuitously reference 'step' to avoid gcc warnings about - * 'set but not used' when compiling -DNO_IPV6 */ -#define SOCKADDR_FAMILY(addr, step) \ - ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \ - (addr)->superfamily == UNIX ? AF_UNIX : \ - (step).curraddr ? AF_INET : AF_INET) -#endif - -/* - * Start a SockAddrStep structure to step through multiple - * addresses. - */ -#ifndef NO_IPV6 -#define START_STEP(addr, step) \ - ((step).ai = (addr)->ais, (step).curraddr = 0) -#else -#define START_STEP(addr, step) \ - ((step).curraddr = 0) -#endif - -static tree234 *sktree; - -static void uxsel_tell(NetSocket *s); - -static int cmpfortree(void *av, void *bv) -{ - NetSocket *a = (NetSocket *) av, *b = (NetSocket *) bv; - int as = a->s, bs = b->s; - if (as < bs) - return -1; - if (as > bs) - return +1; - if (a < b) - return -1; - if (a > b) - return +1; - return 0; -} - -static int cmpforsearch(void *av, void *bv) -{ - NetSocket *b = (NetSocket *) bv; - int as = *(int *)av, bs = b->s; - if (as < bs) - return -1; - if (as > bs) - return +1; - return 0; -} - -void sk_init(void) -{ - sktree = newtree234(cmpfortree); -} - -void sk_cleanup(void) -{ - NetSocket *s; - int i; - - if (sktree) { - for (i = 0; (s = index234(sktree, i)) != NULL; i++) { - close(s->s); - } - } -} - -SockAddr *sk_namelookup(const char *host, char **canonicalname, int address_family) -{ - if (host[0] == '/') { - *canonicalname = dupstr(host); - return unix_sock_addr(host); - } - - SockAddr *ret = snew(SockAddr); -#ifndef NO_IPV6 - struct addrinfo hints; - int err; -#else - unsigned long a; - struct hostent *h = NULL; - int n; -#endif - strbuf *realhost = strbuf_new(); - - /* Clear the structure and default to IPv4. */ - memset(ret, 0, sizeof(SockAddr)); - ret->superfamily = UNRESOLVED; - ret->error = NULL; - ret->refcount = 1; - -#ifndef NO_IPV6 - hints.ai_flags = AI_CANONNAME; - hints.ai_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : - address_family == ADDRTYPE_IPV6 ? AF_INET6 : - AF_UNSPEC); - hints.ai_socktype = SOCK_STREAM; - hints.ai_protocol = 0; - hints.ai_addrlen = 0; - hints.ai_addr = NULL; - hints.ai_canonname = NULL; - hints.ai_next = NULL; - { - char *trimmed_host = host_strduptrim(host); /* strip [] on literals */ - err = getaddrinfo(trimmed_host, NULL, &hints, &ret->ais); - sfree(trimmed_host); - } - if (err != 0) { - ret->error = gai_strerror(err); - strbuf_free(realhost); - return ret; - } - ret->superfamily = IP; - - if (ret->ais->ai_canonname != NULL) - strbuf_catf(realhost, "%s", ret->ais->ai_canonname); - else - strbuf_catf(realhost, "%s", host); -#else - if ((a = inet_addr(host)) == (unsigned long)(in_addr_t)(-1)) { - /* - * Otherwise use the IPv4-only gethostbyname... (NOTE: - * we don't use gethostbyname as a fallback!) - */ - if (ret->superfamily == UNRESOLVED) { - /*debug("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host); */ - if ( (h = gethostbyname(host)) ) - ret->superfamily = IP; - } - if (ret->superfamily == UNRESOLVED) { - ret->error = (h_errno == HOST_NOT_FOUND || - h_errno == NO_DATA || - h_errno == NO_ADDRESS ? "Host does not exist" : - h_errno == TRY_AGAIN ? - "Temporary name service failure" : - "gethostbyname: unknown error"); - strbuf_free(realhost); - return ret; - } - /* This way we are always sure the h->h_name is valid :) */ - strbuf_clear(realhost); - strbuf_catf(realhost, "%s", h->h_name); - for (n = 0; h->h_addr_list[n]; n++); - ret->addresses = snewn(n, unsigned long); - ret->naddresses = n; - for (n = 0; n < ret->naddresses; n++) { - memcpy(&a, h->h_addr_list[n], sizeof(a)); - ret->addresses[n] = ntohl(a); - } - } else { - /* - * This must be a numeric IPv4 address because it caused a - * success return from inet_addr. - */ - ret->superfamily = IP; - strbuf_clear(realhost); - strbuf_catf(realhost, "%s", host); - ret->addresses = snew(unsigned long); - ret->naddresses = 1; - ret->addresses[0] = ntohl(a); - } -#endif - *canonicalname = strbuf_to_str(realhost); - return ret; -} - -SockAddr *sk_nonamelookup(const char *host) -{ - SockAddr *ret = snew(SockAddr); - ret->error = NULL; - ret->superfamily = UNRESOLVED; - strncpy(ret->hostname, host, lenof(ret->hostname)); - ret->hostname[lenof(ret->hostname)-1] = '\0'; -#ifndef NO_IPV6 - ret->ais = NULL; -#else - ret->addresses = NULL; -#endif - ret->refcount = 1; - return ret; -} - -static bool sk_nextaddr(SockAddr *addr, SockAddrStep *step) -{ -#ifndef NO_IPV6 - if (step->ai && step->ai->ai_next) { - step->ai = step->ai->ai_next; - return true; - } else - return false; -#else - if (step->curraddr+1 < addr->naddresses) { - step->curraddr++; - return true; - } else { - return false; - } -#endif -} - -void sk_getaddr(SockAddr *addr, char *buf, int buflen) -{ - if (addr->superfamily == UNRESOLVED || addr->superfamily == UNIX) { - strncpy(buf, addr->hostname, buflen); - buf[buflen-1] = '\0'; - } else { -#ifndef NO_IPV6 - if (getnameinfo(addr->ais->ai_addr, addr->ais->ai_addrlen, buf, buflen, - NULL, 0, NI_NUMERICHOST) != 0) { - buf[0] = '\0'; - strncat(buf, "<unknown>", buflen - 1); - } -#else - struct in_addr a; - SockAddrStep step; - START_STEP(addr, step); - assert(SOCKADDR_FAMILY(addr, step) == AF_INET); - a.s_addr = htonl(addr->addresses[0]); - strncpy(buf, inet_ntoa(a), buflen); - buf[buflen-1] = '\0'; -#endif - } -} - -/* - * This constructs a SockAddr that points at one specific sub-address - * of a parent SockAddr. The returned SockAddr does not own all its - * own memory: it points into the old one's data structures, so it - * MUST NOT be used after the old one is freed, and it MUST NOT be - * passed to sk_addr_free. (The latter is why it's returned by value - * rather than dynamically allocated - that should clue in anyone - * writing a call to it that something is weird about it.) - */ -static SockAddr sk_extractaddr_tmp( - SockAddr *addr, const SockAddrStep *step) -{ - SockAddr toret; - toret = *addr; /* structure copy */ - toret.refcount = 1; - - if (addr->superfamily == IP) { -#ifndef NO_IPV6 - toret.ais = step->ai; -#else - assert(SOCKADDR_FAMILY(addr, *step) == AF_INET); - toret.addresses += step->curraddr; -#endif - } - - return toret; -} - -bool sk_addr_needs_port(SockAddr *addr) -{ - if (addr->superfamily == UNRESOLVED || addr->superfamily == UNIX) { - return false; - } else { - return true; - } -} - -bool sk_hostname_is_local(const char *name) -{ - return !strcmp(name, "localhost") || - !strcmp(name, "::1") || - !strncmp(name, "127.", 4); -} - -#define ipv4_is_loopback(addr) \ - (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000)) - -static bool sockaddr_is_loopback(struct sockaddr *sa) -{ - union sockaddr_union *u = (union sockaddr_union *)sa; - switch (u->sa.sa_family) { - case AF_INET: - return ipv4_is_loopback(u->sin.sin_addr); -#ifndef NO_IPV6 - case AF_INET6: - return IN6_IS_ADDR_LOOPBACK(&u->sin6.sin6_addr); -#endif - case AF_UNIX: - return true; - default: - return false; - } -} - -bool sk_address_is_local(SockAddr *addr) -{ - if (addr->superfamily == UNRESOLVED) - return false; /* we don't know; assume not */ - else if (addr->superfamily == UNIX) - return true; - else { -#ifndef NO_IPV6 - return sockaddr_is_loopback(addr->ais->ai_addr); -#else - struct in_addr a; - SockAddrStep step; - START_STEP(addr, step); - assert(SOCKADDR_FAMILY(addr, step) == AF_INET); - a.s_addr = htonl(addr->addresses[0]); - return ipv4_is_loopback(a); -#endif - } -} - -bool sk_address_is_special_local(SockAddr *addr) -{ - return addr->superfamily == UNIX; -} - -int sk_addrtype(SockAddr *addr) -{ - SockAddrStep step; - int family; - START_STEP(addr, step); - family = SOCKADDR_FAMILY(addr, step); - - return (family == AF_INET ? ADDRTYPE_IPV4 : -#ifndef NO_IPV6 - family == AF_INET6 ? ADDRTYPE_IPV6 : -#endif - ADDRTYPE_NAME); -} - -void sk_addrcopy(SockAddr *addr, char *buf) -{ - SockAddrStep step; - int family; - START_STEP(addr, step); - family = SOCKADDR_FAMILY(addr, step); - -#ifndef NO_IPV6 - if (family == AF_INET) - memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr, - sizeof(struct in_addr)); - else if (family == AF_INET6) - memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr, - sizeof(struct in6_addr)); - else - unreachable("bad address family in sk_addrcopy"); -#else - struct in_addr a; - - assert(family == AF_INET); - a.s_addr = htonl(addr->addresses[step.curraddr]); - memcpy(buf, (char*) &a.s_addr, 4); -#endif -} - -void sk_addr_free(SockAddr *addr) -{ - if (--addr->refcount > 0) - return; -#ifndef NO_IPV6 - if (addr->ais != NULL) - freeaddrinfo(addr->ais); -#else - sfree(addr->addresses); -#endif - sfree(addr); -} - -SockAddr *sk_addr_dup(SockAddr *addr) -{ - addr->refcount++; - return addr; -} - -static Plug *sk_net_plug(Socket *sock, Plug *p) -{ - NetSocket *s = container_of(sock, NetSocket, sock); - Plug *ret = s->plug; - if (p) - s->plug = p; - return ret; -} - -static void sk_net_close(Socket *s); -static size_t sk_net_write(Socket *s, const void *data, size_t len); -static size_t sk_net_write_oob(Socket *s, const void *data, size_t len); -static void sk_net_write_eof(Socket *s); -static void sk_net_set_frozen(Socket *s, bool is_frozen); -static SocketPeerInfo *sk_net_peer_info(Socket *s); -static const char *sk_net_socket_error(Socket *s); - -static const SocketVtable NetSocket_sockvt = { - .plug = sk_net_plug, - .close = sk_net_close, - .write = sk_net_write, - .write_oob = sk_net_write_oob, - .write_eof = sk_net_write_eof, - .set_frozen = sk_net_set_frozen, - .socket_error = sk_net_socket_error, - .peer_info = sk_net_peer_info, -}; - -static Socket *sk_net_accept(accept_ctx_t ctx, Plug *plug) -{ - int sockfd = ctx.i; - NetSocket *ret; - - /* - * Create NetSocket structure. - */ - ret = snew(NetSocket); - ret->sock.vt = &NetSocket_sockvt; - ret->error = NULL; - ret->plug = plug; - bufchain_init(&ret->output_data); - ret->writable = true; /* to start with */ - ret->sending_oob = 0; - ret->frozen = true; - ret->localhost_only = false; /* unused, but best init anyway */ - ret->pending_error = 0; - ret->oobpending = false; - ret->outgoingeof = EOF_NO; - ret->incomingeof = false; - ret->listener = false; - ret->parent = ret->child = NULL; - ret->addr = NULL; - ret->connected = true; - - ret->s = sockfd; - - if (ret->s < 0) { - ret->error = strerror(errno); - return &ret->sock; - } - - ret->oobinline = false; - - uxsel_tell(ret); - add234(sktree, ret); - - return &ret->sock; -} - -static int try_connect(NetSocket *sock) -{ - int s; - union sockaddr_union u; - const union sockaddr_union *sa; - int err = 0; - short localport; - int salen, family; - - /* - * Remove the socket from the tree before we overwrite its - * internal socket id, because that forms part of the tree's - * sorting criterion. We'll add it back before exiting this - * function, whether we changed anything or not. - */ - del234(sktree, sock); - - if (sock->s >= 0) - close(sock->s); - - { - SockAddr thisaddr = sk_extractaddr_tmp( - sock->addr, &sock->step); - plug_log(sock->plug, PLUGLOG_CONNECT_TRYING, - &thisaddr, sock->port, NULL, 0); - } - - /* - * Open socket. - */ - family = SOCKADDR_FAMILY(sock->addr, sock->step); - assert(family != AF_UNSPEC); - s = socket(family, SOCK_STREAM, 0); - sock->s = s; - - if (s < 0) { - err = errno; - goto ret; - } - - cloexec(s); - - if (sock->oobinline) { - int b = 1; - if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, - (void *) &b, sizeof(b)) < 0) { - err = errno; - close(s); - goto ret; - } - } - - if (sock->nodelay && family != AF_UNIX) { - int b = 1; - if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, - (void *) &b, sizeof(b)) < 0) { - err = errno; - close(s); - goto ret; - } - } - - if (sock->keepalive) { - int b = 1; - if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, - (void *) &b, sizeof(b)) < 0) { - err = errno; - close(s); - goto ret; - } - } - - /* - * Bind to local address. - */ - if (sock->privport) - localport = 1023; /* count from 1023 downwards */ - else - localport = 0; /* just use port 0 (ie kernel picks) */ - - /* BSD IP stacks need sockaddr_in zeroed before filling in */ - memset(&u,'\0',sizeof(u)); - - /* We don't try to bind to a local address for UNIX domain sockets. (Why - * do we bother doing the bind when localport == 0 anyway?) */ - if (family != AF_UNIX) { - /* Loop round trying to bind */ - while (1) { - int retcode; - -#ifndef NO_IPV6 - if (family == AF_INET6) { - /* XXX use getaddrinfo to get a local address? */ - u.sin6.sin6_family = AF_INET6; - u.sin6.sin6_addr = in6addr_any; - u.sin6.sin6_port = htons(localport); - retcode = bind(s, &u.sa, sizeof(u.sin6)); - } else -#endif - { - assert(family == AF_INET); - u.sin.sin_family = AF_INET; - u.sin.sin_addr.s_addr = htonl(INADDR_ANY); - u.sin.sin_port = htons(localport); - retcode = bind(s, &u.sa, sizeof(u.sin)); - } - if (retcode >= 0) { - err = 0; - break; /* done */ - } else { - err = errno; - if (err != EADDRINUSE) /* failed, for a bad reason */ - break; - } - - if (localport == 0) - break; /* we're only looping once */ - localport--; - if (localport == 0) - break; /* we might have got to the end */ - } - - if (err) - goto ret; - } - - /* - * Connect to remote address. - */ - switch(family) { -#ifndef NO_IPV6 - case AF_INET: - /* XXX would be better to have got getaddrinfo() to fill in the port. */ - ((struct sockaddr_in *)sock->step.ai->ai_addr)->sin_port = - htons(sock->port); - sa = (const union sockaddr_union *)sock->step.ai->ai_addr; - salen = sock->step.ai->ai_addrlen; - break; - case AF_INET6: - ((struct sockaddr_in *)sock->step.ai->ai_addr)->sin_port = - htons(sock->port); - sa = (const union sockaddr_union *)sock->step.ai->ai_addr; - salen = sock->step.ai->ai_addrlen; - break; -#else - case AF_INET: - u.sin.sin_family = AF_INET; - u.sin.sin_addr.s_addr = htonl(sock->addr->addresses[sock->step.curraddr]); - u.sin.sin_port = htons((short) sock->port); - sa = &u; - salen = sizeof u.sin; - break; -#endif - case AF_UNIX: - assert(strlen(sock->addr->hostname) < sizeof u.su.sun_path); - u.su.sun_family = AF_UNIX; - strcpy(u.su.sun_path, sock->addr->hostname); - sa = &u; - salen = sizeof u.su; - break; - - default: - unreachable("unknown address family"); - exit(1); /* XXX: GCC doesn't understand assert() on some systems. */ - } - - nonblock(s); - - if ((connect(s, &(sa->sa), salen)) < 0) { - if ( errno != EINPROGRESS ) { - err = errno; - goto ret; - } - } else { - /* - * If we _don't_ get EWOULDBLOCK, the connect has completed - * and we should set the socket as connected and writable. - */ - sock->connected = true; - sock->writable = true; - - SockAddr thisaddr = sk_extractaddr_tmp(sock->addr, &sock->step); - plug_log(sock->plug, PLUGLOG_CONNECT_SUCCESS, - &thisaddr, sock->port, NULL, 0); - } - - uxsel_tell(sock); - - ret: - - /* - * No matter what happened, put the socket back in the tree. - */ - add234(sktree, sock); - - if (err) { - SockAddr thisaddr = sk_extractaddr_tmp( - sock->addr, &sock->step); - plug_log(sock->plug, PLUGLOG_CONNECT_FAILED, - &thisaddr, sock->port, strerror(err), err); - } - return err; -} - -Socket *sk_new(SockAddr *addr, int port, bool privport, bool oobinline, - bool nodelay, bool keepalive, Plug *plug) -{ - NetSocket *ret; - int err; - - /* - * Create NetSocket structure. - */ - ret = snew(NetSocket); - ret->sock.vt = &NetSocket_sockvt; - ret->error = NULL; - ret->plug = plug; - bufchain_init(&ret->output_data); - ret->connected = false; /* to start with */ - ret->writable = false; /* to start with */ - ret->sending_oob = 0; - ret->frozen = false; - ret->localhost_only = false; /* unused, but best init anyway */ - ret->pending_error = 0; - ret->parent = ret->child = NULL; - ret->oobpending = false; - ret->outgoingeof = EOF_NO; - ret->incomingeof = false; - ret->listener = false; - ret->addr = addr; - START_STEP(ret->addr, ret->step); - ret->s = -1; - ret->oobinline = oobinline; - ret->nodelay = nodelay; - ret->keepalive = keepalive; - ret->privport = privport; - ret->port = port; - - do { - err = try_connect(ret); - } while (err && sk_nextaddr(ret->addr, &ret->step)); - - if (err) - ret->error = strerror(err); - - return &ret->sock; -} - -Socket *sk_newlistener(const char *srcaddr, int port, Plug *plug, - bool local_host_only, int orig_address_family) -{ - int s; -#ifndef NO_IPV6 - struct addrinfo hints, *ai = NULL; - char portstr[6]; -#endif - union sockaddr_union u; - union sockaddr_union *addr; - int addrlen; - NetSocket *ret; - int retcode; - int address_family; - int on = 1; - - /* - * Create NetSocket structure. - */ - ret = snew(NetSocket); - ret->sock.vt = &NetSocket_sockvt; - ret->error = NULL; - ret->plug = plug; - bufchain_init(&ret->output_data); - ret->writable = false; /* to start with */ - ret->sending_oob = 0; - ret->frozen = false; - ret->localhost_only = local_host_only; - ret->pending_error = 0; - ret->parent = ret->child = NULL; - ret->oobpending = false; - ret->outgoingeof = EOF_NO; - ret->incomingeof = false; - ret->listener = true; - ret->addr = NULL; - ret->s = -1; - - /* - * Translate address_family from platform-independent constants - * into local reality. - */ - address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET : -#ifndef NO_IPV6 - orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 : -#endif - AF_UNSPEC); - -#ifndef NO_IPV6 - /* Let's default to IPv6. - * If the stack doesn't support IPv6, we will fall back to IPv4. */ - if (address_family == AF_UNSPEC) address_family = AF_INET6; -#else - /* No other choice, default to IPv4 */ - if (address_family == AF_UNSPEC) address_family = AF_INET; -#endif - - /* - * Open socket. - */ - s = socket(address_family, SOCK_STREAM, 0); - -#ifndef NO_IPV6 - /* If the host doesn't support IPv6 try fallback to IPv4. */ - if (s < 0 && address_family == AF_INET6) { - address_family = AF_INET; - s = socket(address_family, SOCK_STREAM, 0); - } -#endif - - if (s < 0) { - ret->error = strerror(errno); - return &ret->sock; - } - - cloexec(s); - - ret->oobinline = false; - - if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, - (const char *)&on, sizeof(on)) < 0) { - ret->error = strerror(errno); - close(s); - return &ret->sock; - } - - retcode = -1; - addr = NULL; addrlen = -1; /* placate optimiser */ - - if (srcaddr != NULL) { -#ifndef NO_IPV6 - hints.ai_flags = AI_NUMERICHOST; - hints.ai_family = address_family; - hints.ai_socktype = SOCK_STREAM; - hints.ai_protocol = 0; - hints.ai_addrlen = 0; - hints.ai_addr = NULL; - hints.ai_canonname = NULL; - hints.ai_next = NULL; - assert(port >= 0 && port <= 99999); - sprintf(portstr, "%d", port); - { - char *trimmed_addr = host_strduptrim(srcaddr); - retcode = getaddrinfo(trimmed_addr, portstr, &hints, &ai); - sfree(trimmed_addr); - } - if (retcode == 0) { - addr = (union sockaddr_union *)ai->ai_addr; - addrlen = ai->ai_addrlen; - } -#else - memset(&u,'\0',sizeof u); - u.sin.sin_family = AF_INET; - u.sin.sin_port = htons(port); - u.sin.sin_addr.s_addr = inet_addr(srcaddr); - if (u.sin.sin_addr.s_addr != (in_addr_t)(-1)) { - /* Override localhost_only with specified listen addr. */ - ret->localhost_only = ipv4_is_loopback(u.sin.sin_addr); - } - addr = &u; - addrlen = sizeof(u.sin); - retcode = 0; -#endif - } - - if (retcode != 0) { - memset(&u,'\0',sizeof u); -#ifndef NO_IPV6 - if (address_family == AF_INET6) { - u.sin6.sin6_family = AF_INET6; - u.sin6.sin6_port = htons(port); - if (local_host_only) - u.sin6.sin6_addr = in6addr_loopback; - else - u.sin6.sin6_addr = in6addr_any; - addr = &u; - addrlen = sizeof(u.sin6); - } else -#endif - { - u.sin.sin_family = AF_INET; - u.sin.sin_port = htons(port); - if (local_host_only) - u.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); - else - u.sin.sin_addr.s_addr = htonl(INADDR_ANY); - addr = &u; - addrlen = sizeof(u.sin); - } - } - - retcode = bind(s, &addr->sa, addrlen); - -#ifndef NO_IPV6 - if (ai) - freeaddrinfo(ai); -#endif - - if (retcode < 0) { - close(s); - ret->error = strerror(errno); - return &ret->sock; - } - - if (listen(s, SOMAXCONN) < 0) { - close(s); - ret->error = strerror(errno); - return &ret->sock; - } - -#ifndef NO_IPV6 - /* - * If we were given ADDRTYPE_UNSPEC, we must also create an - * IPv4 listening socket and link it to this one. - */ - if (address_family == AF_INET6 && orig_address_family == ADDRTYPE_UNSPEC) { - NetSocket *other; - - other = container_of( - sk_newlistener(srcaddr, port, plug, - local_host_only, ADDRTYPE_IPV4), - NetSocket, sock); - - if (other) { - if (!other->error) { - other->parent = ret; - ret->child = other; - } else { - /* If we couldn't create a listening socket on IPv4 as well - * as IPv6, we must return an error overall. */ - close(s); - sfree(ret); - return &other->sock; - } - } - } -#endif - - ret->s = s; - - uxsel_tell(ret); - add234(sktree, ret); - - return &ret->sock; -} - -static void sk_net_close(Socket *sock) -{ - NetSocket *s = container_of(sock, NetSocket, sock); - - if (s->child) - sk_net_close(&s->child->sock); - - bufchain_clear(&s->output_data); - - del234(sktree, s); - if (s->s >= 0) { - uxsel_del(s->s); - close(s->s); - } - if (s->addr) - sk_addr_free(s->addr); - delete_callbacks_for_context(s); - sfree(s); -} - -void *sk_getxdmdata(Socket *sock, int *lenp) -{ - NetSocket *s; - union sockaddr_union u; - socklen_t addrlen; - char *buf; - static unsigned int unix_addr = 0xFFFFFFFF; - - /* - * We must check that this socket really _is_ a NetSocket before - * downcasting it. - */ - if (sock->vt != &NetSocket_sockvt) - return NULL; /* failure */ - s = container_of(sock, NetSocket, sock); - - addrlen = sizeof(u); - if (getsockname(s->s, &u.sa, &addrlen) < 0) - return NULL; - switch(u.sa.sa_family) { - case AF_INET: - *lenp = 6; - buf = snewn(*lenp, char); - PUT_32BIT_MSB_FIRST(buf, ntohl(u.sin.sin_addr.s_addr)); - PUT_16BIT_MSB_FIRST(buf+4, ntohs(u.sin.sin_port)); - break; -#ifndef NO_IPV6 - case AF_INET6: - *lenp = 6; - buf = snewn(*lenp, char); - if (IN6_IS_ADDR_V4MAPPED(&u.sin6.sin6_addr)) { - memcpy(buf, u.sin6.sin6_addr.s6_addr + 12, 4); - PUT_16BIT_MSB_FIRST(buf+4, ntohs(u.sin6.sin6_port)); - } else - /* This is stupid, but it's what XLib does. */ - memset(buf, 0, 6); - break; -#endif - case AF_UNIX: - *lenp = 6; - buf = snewn(*lenp, char); - PUT_32BIT_MSB_FIRST(buf, unix_addr--); - PUT_16BIT_MSB_FIRST(buf+4, getpid()); - break; - - /* XXX IPV6 */ - - default: - return NULL; - } - - return buf; -} - -/* - * Deal with socket errors detected in try_send(). - */ -static void socket_error_callback(void *vs) -{ - NetSocket *s = (NetSocket *)vs; - - /* - * Just in case other socket work has caused this socket to vanish - * or become somehow non-erroneous before this callback arrived... - */ - if (!find234(sktree, s, NULL) || !s->pending_error) - return; - - /* - * An error has occurred on this socket. Pass it to the plug. - */ - plug_closing(s->plug, strerror(s->pending_error), s->pending_error, 0); -} - -/* - * The function which tries to send on a socket once it's deemed - * writable. - */ -void try_send(NetSocket *s) -{ - while (s->sending_oob || bufchain_size(&s->output_data) > 0) { - int nsent; - int err; - const void *data; - size_t len; - int urgentflag; - - if (s->sending_oob) { - urgentflag = MSG_OOB; - len = s->sending_oob; - data = &s->oobdata; - } else { - urgentflag = 0; - ptrlen bufdata = bufchain_prefix(&s->output_data); - data = bufdata.ptr; - len = bufdata.len; - } - nsent = send(s->s, data, len, urgentflag); - noise_ultralight(NOISE_SOURCE_IOLEN, nsent); - if (nsent <= 0) { - err = (nsent < 0 ? errno : 0); - if (err == EWOULDBLOCK) { - /* - * Perfectly normal: we've sent all we can for the moment. - */ - s->writable = false; - return; - } else { - /* - * We unfortunately can't just call plug_closing(), - * because it's quite likely that we're currently - * _in_ a call from the code we'd be calling back - * to, so we'd have to make half the SSH code - * reentrant. Instead we flag a pending error on - * the socket, to be dealt with (by calling - * plug_closing()) at some suitable future moment. - */ - s->pending_error = err; - /* - * Immediately cease selecting on this socket, so that - * we don't tight-loop repeatedly trying to do - * whatever it was that went wrong. - */ - uxsel_tell(s); - /* - * Arrange to be called back from the top level to - * deal with the error condition on this socket. - */ - queue_toplevel_callback(socket_error_callback, s); - return; - } - } else { - if (s->sending_oob) { - if (nsent < len) { - memmove(s->oobdata, s->oobdata+nsent, len-nsent); - s->sending_oob = len - nsent; - } else { - s->sending_oob = 0; - } - } else { - bufchain_consume(&s->output_data, nsent); - } - } - } - - /* - * If we reach here, we've finished sending everything we might - * have needed to send. Send EOF, if we need to. - */ - if (s->outgoingeof == EOF_PENDING) { - shutdown(s->s, SHUT_WR); - s->outgoingeof = EOF_SENT; - } - - /* - * Also update the select status, because we don't need to select - * for writing any more. - */ - uxsel_tell(s); -} - -static size_t sk_net_write(Socket *sock, const void *buf, size_t len) -{ - NetSocket *s = container_of(sock, NetSocket, sock); - - assert(s->outgoingeof == EOF_NO); - - /* - * Add the data to the buffer list on the socket. - */ - bufchain_add(&s->output_data, buf, len); - - /* - * Now try sending from the start of the buffer list. - */ - if (s->writable) - try_send(s); - - /* - * Update the select() status to correctly reflect whether or - * not we should be selecting for write. - */ - uxsel_tell(s); - - return bufchain_size(&s->output_data); -} - -static size_t sk_net_write_oob(Socket *sock, const void *buf, size_t len) -{ - NetSocket *s = container_of(sock, NetSocket, sock); - - assert(s->outgoingeof == EOF_NO); - - /* - * Replace the buffer list on the socket with the data. - */ - bufchain_clear(&s->output_data); - assert(len <= sizeof(s->oobdata)); - memcpy(s->oobdata, buf, len); - s->sending_oob = len; - - /* - * Now try sending from the start of the buffer list. - */ - if (s->writable) - try_send(s); - - /* - * Update the select() status to correctly reflect whether or - * not we should be selecting for write. - */ - uxsel_tell(s); - - return s->sending_oob; -} - -static void sk_net_write_eof(Socket *sock) -{ - NetSocket *s = container_of(sock, NetSocket, sock); - - assert(s->outgoingeof == EOF_NO); - - /* - * Mark the socket as pending outgoing EOF. - */ - s->outgoingeof = EOF_PENDING; - - /* - * Now try sending from the start of the buffer list. - */ - if (s->writable) - try_send(s); - - /* - * Update the select() status to correctly reflect whether or - * not we should be selecting for write. - */ - uxsel_tell(s); -} - -static void net_select_result(int fd, int event) -{ - int ret; - char buf[20480]; /* nice big buffer for plenty of speed */ - NetSocket *s; - bool atmark = true; - - /* Find the Socket structure */ - s = find234(sktree, &fd, cmpforsearch); - if (!s) - return; /* boggle */ - - noise_ultralight(NOISE_SOURCE_IOID, fd); - - switch (event) { - case SELECT_X: /* exceptional */ - if (!s->oobinline) { - /* - * On a non-oobinline socket, this indicates that we - * can immediately perform an OOB read and get back OOB - * data, which we will send to the back end with - * type==2 (urgent data). - */ - ret = recv(s->s, buf, sizeof(buf), MSG_OOB); - noise_ultralight(NOISE_SOURCE_IOLEN, ret); - if (ret <= 0) { - plug_closing(s->plug, - ret == 0 ? "Internal networking trouble" : - strerror(errno), errno, 0); - } else { - /* - * Receiving actual data on a socket means we can - * stop falling back through the candidate - * addresses to connect to. - */ - if (s->addr) { - sk_addr_free(s->addr); - s->addr = NULL; - } - plug_receive(s->plug, 2, buf, ret); - } - break; - } - - /* - * If we reach here, this is an oobinline socket, which - * means we should set s->oobpending and then deal with it - * when we get called for the readability event (which - * should also occur). - */ - s->oobpending = true; - break; - case SELECT_R: /* readable; also acceptance */ - if (s->listener) { - /* - * On a listening socket, the readability event means a - * connection is ready to be accepted. - */ - union sockaddr_union su; - socklen_t addrlen = sizeof(su); - accept_ctx_t actx; - int t; /* socket of connection */ - - memset(&su, 0, addrlen); - t = accept(s->s, &su.sa, &addrlen); - if (t < 0) { - break; - } - - nonblock(t); - actx.i = t; - - if ((!s->addr || s->addr->superfamily != UNIX) && - s->localhost_only && !sockaddr_is_loopback(&su.sa)) { - close(t); /* someone let nonlocal through?! */ - } else if (plug_accepting(s->plug, sk_net_accept, actx)) { - close(t); /* denied or error */ - } - break; - } - - /* - * If we reach here, this is not a listening socket, so - * readability really means readability. - */ - - /* In the case the socket is still frozen, we don't even bother */ - if (s->frozen) - break; - - /* - * We have received data on the socket. For an oobinline - * socket, this might be data _before_ an urgent pointer, - * in which case we send it to the back end with type==1 - * (data prior to urgent). - */ - if (s->oobinline && s->oobpending) { - int atmark_from_ioctl; - if (ioctl(s->s, SIOCATMARK, &atmark_from_ioctl) == 0) { - atmark = atmark_from_ioctl; - if (atmark) - s->oobpending = false; /* clear this indicator */ - } - } else - atmark = true; - - ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0); - noise_ultralight(NOISE_SOURCE_IOLEN, ret); - if (ret < 0) { - if (errno == EWOULDBLOCK) { - break; - } - } - if (ret < 0) { - plug_closing(s->plug, strerror(errno), errno, 0); - } else if (0 == ret) { - s->incomingeof = true; /* stop trying to read now */ - uxsel_tell(s); - plug_closing(s->plug, NULL, 0, 0); - } else { - /* - * Receiving actual data on a socket means we can - * stop falling back through the candidate - * addresses to connect to. - */ - if (s->addr) { - sk_addr_free(s->addr); - s->addr = NULL; - } - plug_receive(s->plug, atmark ? 0 : 1, buf, ret); - } - break; - case SELECT_W: /* writable */ - if (!s->connected) { - /* - * select/poll reports a socket as _writable_ when an - * asynchronous connect() attempt either completes or - * fails. So first we must find out which. - */ - { - int err; - socklen_t errlen = sizeof(err); - char *errmsg = NULL; - if (getsockopt(s->s, SOL_SOCKET, SO_ERROR, &err, &errlen)<0) { - errmsg = dupprintf("getsockopt(SO_ERROR): %s", - strerror(errno)); - err = errno; /* got to put something in here */ - } else if (err != 0) { - errmsg = dupstr(strerror(err)); - } - if (errmsg) { - /* - * The asynchronous connection attempt failed. - * Report the problem via plug_log, and try again - * with the next candidate address, if we have - * more than one. - */ - SockAddr thisaddr; - assert(s->addr); - - thisaddr = sk_extractaddr_tmp(s->addr, &s->step); - plug_log(s->plug, PLUGLOG_CONNECT_FAILED, - &thisaddr, s->port, errmsg, err); - - while (err && s->addr && sk_nextaddr(s->addr, &s->step)) { - err = try_connect(s); - } - if (err) { - plug_closing(s->plug, strerror(err), err, 0); - return; /* socket is now presumably defunct */ - } - if (!s->connected) - return; /* another async attempt in progress */ - } else { - /* - * The connection attempt succeeded. - */ - SockAddr thisaddr = sk_extractaddr_tmp(s->addr, &s->step); - plug_log(s->plug, PLUGLOG_CONNECT_SUCCESS, - &thisaddr, s->port, NULL, 0); - } - } - - /* - * If we get here, we've managed to make a connection. - */ - if (s->addr) { - sk_addr_free(s->addr); - s->addr = NULL; - } - s->connected = true; - s->writable = true; - uxsel_tell(s); - } else { - size_t bufsize_before, bufsize_after; - s->writable = true; - bufsize_before = s->sending_oob + bufchain_size(&s->output_data); - try_send(s); - bufsize_after = s->sending_oob + bufchain_size(&s->output_data); - if (bufsize_after < bufsize_before) - plug_sent(s->plug, bufsize_after); - } - break; - } -} - -/* - * Special error values are returned from sk_namelookup and sk_new - * if there's a problem. These functions extract an error message, - * or return NULL if there's no problem. - */ -const char *sk_addr_error(SockAddr *addr) -{ - return addr->error; -} -static const char *sk_net_socket_error(Socket *sock) -{ - NetSocket *s = container_of(sock, NetSocket, sock); - return s->error; -} - -static void sk_net_set_frozen(Socket *sock, bool is_frozen) -{ - NetSocket *s = container_of(sock, NetSocket, sock); - if (s->frozen == is_frozen) - return; - s->frozen = is_frozen; - uxsel_tell(s); -} - -static SocketPeerInfo *sk_net_peer_info(Socket *sock) -{ - NetSocket *s = container_of(sock, NetSocket, sock); - union sockaddr_union addr; - socklen_t addrlen = sizeof(addr); -#ifndef NO_IPV6 - char buf[INET6_ADDRSTRLEN]; -#endif - SocketPeerInfo *pi; - - if (getpeername(s->s, &addr.sa, &addrlen) < 0) - return NULL; - - pi = snew(SocketPeerInfo); - pi->addressfamily = ADDRTYPE_UNSPEC; - pi->addr_text = NULL; - pi->port = -1; - pi->log_text = NULL; - - if (addr.storage.ss_family == AF_INET) { - pi->addressfamily = ADDRTYPE_IPV4; - memcpy(pi->addr_bin.ipv4, &addr.sin.sin_addr, 4); - pi->port = ntohs(addr.sin.sin_port); - pi->addr_text = dupstr(inet_ntoa(addr.sin.sin_addr)); - pi->log_text = dupprintf("%s:%d", pi->addr_text, pi->port); - -#ifndef NO_IPV6 - } else if (addr.storage.ss_family == AF_INET6) { - pi->addressfamily = ADDRTYPE_IPV6; - memcpy(pi->addr_bin.ipv6, &addr.sin6.sin6_addr, 16); - pi->port = ntohs(addr.sin6.sin6_port); - pi->addr_text = dupstr( - inet_ntop(AF_INET6, &addr.sin6.sin6_addr, buf, sizeof(buf))); - pi->log_text = dupprintf("[%s]:%d", pi->addr_text, pi->port); -#endif - - } else if (addr.storage.ss_family == AF_UNIX) { - pi->addressfamily = ADDRTYPE_LOCAL; - - /* - * For Unix sockets, the source address is unlikely to be - * helpful, so we leave addr_txt NULL (and we certainly can't - * fill in port, obviously). Instead, we try SO_PEERCRED and - * try to get the source pid, and put that in the log text. - */ - int pid, uid, gid; - if (so_peercred(s->s, &pid, &uid, &gid)) { - char uidbuf[64], gidbuf[64]; - sprintf(uidbuf, "%d", uid); - sprintf(gidbuf, "%d", gid); - struct passwd *pw = getpwuid(uid); - struct group *gr = getgrgid(gid); - pi->log_text = dupprintf("pid %d (%s:%s)", pid, - pw ? pw->pw_name : uidbuf, - gr ? gr->gr_name : gidbuf); - } - } else { - sfree(pi); - return NULL; - } - - return pi; -} - -int sk_net_get_fd(Socket *sock) -{ - /* This function is not fully general: it only works on NetSocket */ - if (sock->vt != &NetSocket_sockvt) - return -1; /* failure */ - NetSocket *s = container_of(sock, NetSocket, sock); - return s->s; -} - -static void uxsel_tell(NetSocket *s) -{ - int rwx = 0; - if (!s->pending_error) { - if (s->listener) { - rwx |= SELECT_R; /* read == accept */ - } else { - if (!s->connected) - rwx |= SELECT_W; /* write == connect */ - if (s->connected && !s->frozen && !s->incomingeof) - rwx |= SELECT_R | SELECT_X; - if (bufchain_size(&s->output_data)) - rwx |= SELECT_W; - } - } - uxsel_set(s->s, rwx, net_select_result); -} - -int net_service_lookup(char *service) -{ - struct servent *se; - se = getservbyname(service, NULL); - if (se != NULL) - return ntohs(se->s_port); - else - return 0; -} - -char *get_hostname(void) -{ - size_t size = 0; - char *hostname = NULL; - do { - sgrowarray(hostname, size, size); - if ((gethostname(hostname, size) < 0) && (errno != ENAMETOOLONG)) { - sfree(hostname); - hostname = NULL; - break; - } - } while (strlen(hostname) >= size-1); - return hostname; -} - -SockAddr *platform_get_x11_unix_address(const char *sockpath, int displaynum) -{ - SockAddr *ret = snew(SockAddr); - int n; - - memset(ret, 0, sizeof *ret); - ret->superfamily = UNIX; - /* - * In special circumstances (notably Mac OS X Leopard), we'll - * have been passed an explicit Unix socket path. - */ - if (sockpath) { - n = snprintf(ret->hostname, sizeof ret->hostname, - "%s", sockpath); - } else { - n = snprintf(ret->hostname, sizeof ret->hostname, - "%s%d", X11_UNIX_PATH, displaynum); - } - - if (n < 0) - ret->error = "snprintf failed"; - else if (n >= sizeof ret->hostname) - ret->error = "X11 UNIX name too long"; - -#ifndef NO_IPV6 - ret->ais = NULL; -#else - ret->addresses = NULL; - ret->naddresses = 0; -#endif - ret->refcount = 1; - return ret; -} - -SockAddr *unix_sock_addr(const char *path) -{ - SockAddr *ret = snew(SockAddr); - int n; - - memset(ret, 0, sizeof *ret); - ret->superfamily = UNIX; - n = snprintf(ret->hostname, sizeof ret->hostname, "%s", path); - - if (n < 0) - ret->error = "snprintf failed"; - else if (n >= sizeof ret->hostname || - n >= sizeof(((struct sockaddr_un *)0)->sun_path)) - ret->error = "socket pathname too long"; - -#ifndef NO_IPV6 - ret->ais = NULL; -#else - ret->addresses = NULL; - ret->naddresses = 0; -#endif - ret->refcount = 1; - return ret; -} - -Socket *new_unix_listener(SockAddr *listenaddr, Plug *plug) -{ - int s; - union sockaddr_union u; - union sockaddr_union *addr; - int addrlen; - NetSocket *ret; - int retcode; - - /* - * Create NetSocket structure. - */ - ret = snew(NetSocket); - ret->sock.vt = &NetSocket_sockvt; - ret->error = NULL; - ret->plug = plug; - bufchain_init(&ret->output_data); - ret->writable = false; /* to start with */ - ret->sending_oob = 0; - ret->frozen = false; - ret->localhost_only = true; - ret->pending_error = 0; - ret->parent = ret->child = NULL; - ret->oobpending = false; - ret->outgoingeof = EOF_NO; - ret->incomingeof = false; - ret->listener = true; - ret->addr = listenaddr; - ret->s = -1; - - assert(listenaddr->superfamily == UNIX); - - /* - * Open socket. - */ - s = socket(AF_UNIX, SOCK_STREAM, 0); - if (s < 0) { - ret->error = strerror(errno); - return &ret->sock; - } - - cloexec(s); - - ret->oobinline = false; - - memset(&u, '\0', sizeof(u)); - u.su.sun_family = AF_UNIX; -#if __GNUC__ >= 8 -# pragma GCC diagnostic push -# pragma GCC diagnostic ignored "-Wstringop-truncation" -#endif // __GNUC__ >= 8 - strncpy(u.su.sun_path, listenaddr->hostname, sizeof(u.su.sun_path)-1); -#if __GNUC__ >= 8 -# pragma GCC diagnostic pop -#endif // __GNUC__ >= 8 - addr = &u; - addrlen = sizeof(u.su); - - if (unlink(u.su.sun_path) < 0 && errno != ENOENT) { - close(s); - ret->error = strerror(errno); - return &ret->sock; - } - - retcode = bind(s, &addr->sa, addrlen); - if (retcode < 0) { - close(s); - ret->error = strerror(errno); - return &ret->sock; - } - - if (listen(s, SOMAXCONN) < 0) { - close(s); - ret->error = strerror(errno); - return &ret->sock; - } - - ret->s = s; - - uxsel_tell(ret); - add234(sktree, ret); - - return &ret->sock; -} |