X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/776792d730f2f0776222a28932d1306e96eec246..d7d6c34d75b51ee249032eb36faec21135f19776:/unix/uxnet.c diff --git a/unix/uxnet.c b/unix/uxnet.c index cbe67306..5190ef83 100644 --- a/unix/uxnet.c +++ b/unix/uxnet.c @@ -15,13 +15,59 @@ #include #include #include +#include #define DEFINE_PLUG_METHOD_MACROS #include "putty.h" #include "network.h" #include "tree234.h" -#define ipv4_is_loopback(addr) (inet_netof(addr) == IN_LOOPBACKNET) +/* Solaris needs for SIOCATMARK. */ +#ifndef SIOCATMARK +#include +#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 { +#ifdef NO_IPV6 + struct sockaddr_in storage; +#else + struct sockaddr_storage storage; + struct sockaddr_in6 sin6; +#endif + struct sockaddr sa; + struct sockaddr_in sin; + struct sockaddr_un su; +}; + +/* + * We used to typedef struct Socket_tag *Socket. + * + * Since we have made the networking abstraction slightly more + * abstract, Socket no longer means a tcp socket (it could mean + * an ssl socket). So now we must use Actual_Socket when we know + * we are talking about a tcp socket. + */ +typedef struct Socket_tag *Actual_Socket; + +/* + * 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; +}; struct Socket_tag { struct socket_function_table *fn; @@ -31,47 +77,73 @@ struct Socket_tag { Plug plug; void *private_ptr; bufchain output_data; - int connected; + int connected; /* irrelevant for listening sockets */ int writable; int frozen; /* this causes readability notifications to be ignored */ - int frozen_readable; /* this means we missed at least one readability - * notification while we were frozen */ int localhost_only; /* for listening sockets */ char oobdata[1]; int sending_oob; int oobpending; /* is there OOB data available to read? */ int oobinline; + enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof; + int incomingeof; int pending_error; /* in case send() returns error */ int listener; + int nodelay, keepalive; /* for connect()-type sockets */ + int privport, 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. + */ + Actual_Socket parent, child; }; -/* - * We used to typedef struct Socket_tag *Socket. - * - * Since we have made the networking abstraction slightly more - * abstract, Socket no longer means a tcp socket (it could mean - * an ssl socket). So now we must use Actual_Socket when we know - * we are talking about a tcp socket. - */ -typedef struct Socket_tag *Actual_Socket; - struct SockAddr_tag { + int refcount; const char *error; - /* - * 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. - */ - int family; -#ifdef IPV6 - struct addrinfo *ai; /* Address IPv6 style. */ + enum { UNRESOLVED, UNIX, IP } superfamily; +#ifndef NO_IPV6 + struct addrinfo *ais; /* Addresses IPv6 style. */ #else - unsigned long address; /* Address IPv4 style. */ + 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 +#define SOCKADDR_FAMILY(addr, step) \ + ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \ + (addr)->superfamily == UNIX ? AF_UNIX : 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(Actual_Socket s); @@ -84,6 +156,10 @@ static int cmpfortree(void *av, void *bv) return -1; if (as > bs) return +1; + if (a < b) + return -1; + if (a > b) + return +1; return 0; } @@ -115,81 +191,88 @@ void sk_cleanup(void) } } -const char *error_string(int error) -{ - return strerror(error); -} - -SockAddr sk_namelookup(const char *host, char **canonicalname) +SockAddr sk_namelookup(const char *host, char **canonicalname, int address_family) { SockAddr ret = snew(struct SockAddr_tag); -#ifdef IPV6 +#ifndef NO_IPV6 struct addrinfo hints; int err; #else unsigned long a; struct hostent *h = NULL; + int n; #endif char realhost[8192]; /* Clear the structure and default to IPv4. */ memset(ret, 0, sizeof(struct SockAddr_tag)); - ret->family = 0; /* We set this one when we have resolved the host. */ + ret->superfamily = UNRESOLVED; *realhost = '\0'; ret->error = NULL; + ret->refcount = 1; -#ifdef IPV6 +#ifndef NO_IPV6 hints.ai_flags = AI_CANONNAME; - hints.ai_family = AF_UNSPEC; - hints.ai_socktype = 0; + 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; - err = getaddrinfo(host, NULL, NULL, &ret->ai); + err = getaddrinfo(host, NULL, &hints, &ret->ais); if (err != 0) { ret->error = gai_strerror(err); return ret; } - ret->family = ret->ai->ai_family; + ret->superfamily = IP; *realhost = '\0'; - if (ret->ai->ai_canonname != NULL) - strncat(realhost, ret->ai->ai_canonname, sizeof(realhost) - 1); + if (ret->ais->ai_canonname != NULL) + strncat(realhost, ret->ais->ai_canonname, sizeof(realhost) - 1); else strncat(realhost, host, sizeof(realhost) - 1); #else - if ((a = inet_addr(host)) == (unsigned long) INADDR_NONE) { + 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->family == 0) { - /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ - if ( (h = gethostbyname(host)) ) - ret->family = AF_INET; + if (ret->superfamily == UNRESOLVED) { + /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ + if ( (h = gethostbyname(host)) ) + ret->superfamily = IP; } - if (ret->family == 0) { - 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"); - return ret; + 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"); + return ret; } - memcpy(&a, h->h_addr, sizeof(a)); /* This way we are always sure the h->h_name is valid :) */ strncpy(realhost, h->h_name, sizeof(realhost)); + 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->family = AF_INET; + ret->superfamily = IP; strncpy(realhost, host, sizeof(realhost)); + ret->addresses = snew(unsigned long); + ret->naddresses = 1; + ret->addresses[0] = ntohl(a); } - ret->address = ntohl(a); #endif realhost[lenof(realhost)-1] = '\0'; *canonicalname = snewn(1+strlen(realhost), char); @@ -201,29 +284,57 @@ SockAddr sk_nonamelookup(const char *host) { SockAddr ret = snew(struct SockAddr_tag); ret->error = NULL; - ret->family = AF_UNSPEC; + 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; } -void sk_getaddr(SockAddr addr, char *buf, int buflen) +static int 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 +} - if (addr->family == AF_UNSPEC) { +void sk_getaddr(SockAddr addr, char *buf, int buflen) +{ + /* XXX not clear what we should return for Unix-domain sockets; let's + * hope the question never arises */ + assert(addr->superfamily != UNIX); + if (addr->superfamily == UNRESOLVED) { strncpy(buf, addr->hostname, buflen); buf[buflen-1] = '\0'; } else { -#ifdef IPV6 - if (getnameinfo(addr->ai->ai_addr, addr->ai->ai_addrlen, buf, buflen, +#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, "", buflen - 1); } #else struct in_addr a; - assert(addr->family == AF_INET); - a.s_addr = htonl(addr->address); + 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 @@ -232,73 +343,114 @@ void sk_getaddr(SockAddr addr, char *buf, int buflen) int sk_hostname_is_local(char *name) { - return !strcmp(name, "localhost"); + return !strcmp(name, "localhost") || + !strcmp(name, "::1") || + !strncmp(name, "127.", 4); } -int sk_address_is_local(SockAddr addr) +#define ipv4_is_loopback(addr) \ + (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000)) + +static int 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; + } +} - if (addr->family == AF_UNSPEC) +int sk_address_is_local(SockAddr addr) +{ + if (addr->superfamily == UNRESOLVED) return 0; /* we don't know; assume not */ + else if (addr->superfamily == UNIX) + return 1; else { -#ifdef IPV6 - if (addr->family == AF_INET) - return ipv4_is_loopback( - ((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr); - else if (addr->family == AF_INET6) - return IN6_IS_ADDR_LOOPBACK( - &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr); - else - return 0; +#ifndef NO_IPV6 + return sockaddr_is_loopback(addr->ais->ai_addr); #else struct in_addr a; - assert(addr->family == AF_INET); - a.s_addr = htonl(addr->address); + 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 } } +int sk_address_is_special_local(SockAddr addr) +{ + return addr->superfamily == UNIX; +} + int sk_addrtype(SockAddr addr) { - return (addr->family == AF_INET ? ADDRTYPE_IPV4 : -#ifdef IPV6 - addr->family == AF_INET6 ? ADDRTYPE_IPV6 : + 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); -#ifdef IPV6 - if (addr->family == AF_INET) - memcpy(buf, &((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr, +#ifndef NO_IPV6 + if (family == AF_INET) + memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr, sizeof(struct in_addr)); - else if (addr->family == AF_INET6) - memcpy(buf, &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr, + else if (family == AF_INET6) + memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr, sizeof(struct in6_addr)); else assert(FALSE); #else struct in_addr a; - assert(addr->family == AF_INET); - a.s_addr = htonl(addr->address); + 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) { - -#ifdef IPV6 - if (addr->ai != NULL) - freeaddrinfo(addr->ai); + 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_tcp_plug(Socket sock, Plug p) { Actual_Socket s = (Actual_Socket) sock; @@ -319,6 +471,7 @@ static void sk_tcp_flush(Socket s) static void sk_tcp_close(Socket s); static int sk_tcp_write(Socket s, const char *data, int len); static int sk_tcp_write_oob(Socket s, const char *data, int len); +static void sk_tcp_write_eof(Socket s); static void sk_tcp_set_private_ptr(Socket s, void *ptr); static void *sk_tcp_get_private_ptr(Socket s); static void sk_tcp_set_frozen(Socket s, int is_frozen); @@ -329,6 +482,7 @@ static struct socket_function_table tcp_fn_table = { sk_tcp_close, sk_tcp_write, sk_tcp_write_oob, + sk_tcp_write_eof, sk_tcp_flush, sk_tcp_set_private_ptr, sk_tcp_get_private_ptr, @@ -351,16 +505,20 @@ Socket sk_register(OSSocket sockfd, Plug plug) ret->writable = 1; /* to start with */ ret->sending_oob = 0; ret->frozen = 1; - ret->frozen_readable = 0; ret->localhost_only = 0; /* unused, but best init anyway */ ret->pending_error = 0; ret->oobpending = FALSE; + ret->outgoingeof = EOF_NO; + ret->incomingeof = FALSE; ret->listener = 0; + ret->parent = ret->child = NULL; + ret->addr = NULL; + ret->connected = 1; ret->s = sockfd; if (ret->s < 0) { - ret->error = error_string(errno); + ret->error = strerror(errno); return (Socket) ret; } @@ -372,174 +530,256 @@ Socket sk_register(OSSocket sockfd, Plug plug) return (Socket) ret; } -Socket sk_new(SockAddr addr, int port, int privport, int oobinline, - int nodelay, Plug plug) +static int try_connect(Actual_Socket sock) { int s; -#ifdef IPV6 - struct sockaddr_in6 a6; -#endif - struct sockaddr_in a; - int err; - Actual_Socket ret; + union sockaddr_union u; + const union sockaddr_union *sa; + int err = 0; short localport; - int fl; + int salen, family; /* - * Create Socket structure. + * 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. */ - ret = snew(struct Socket_tag); - ret->fn = &tcp_fn_table; - ret->error = NULL; - ret->plug = plug; - bufchain_init(&ret->output_data); - ret->connected = 0; /* to start with */ - ret->writable = 0; /* to start with */ - ret->sending_oob = 0; - ret->frozen = 0; - ret->frozen_readable = 0; - ret->localhost_only = 0; /* unused, but best init anyway */ - ret->pending_error = 0; - ret->oobpending = FALSE; - ret->listener = 0; + del234(sktree, sock); + + if (sock->s >= 0) + close(sock->s); + + plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0); /* * Open socket. */ - assert(addr->family != AF_UNSPEC); - s = socket(addr->family, SOCK_STREAM, 0); - ret->s = s; + family = SOCKADDR_FAMILY(sock->addr, sock->step); + assert(family != AF_UNSPEC); + s = socket(family, SOCK_STREAM, 0); + sock->s = s; if (s < 0) { - ret->error = error_string(errno); - return (Socket) ret; + err = errno; + goto ret; } - ret->oobinline = oobinline; - if (oobinline) { + cloexec(s); + + if (sock->oobinline) { + int b = TRUE; + if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, + (void *) &b, sizeof(b)) < 0) { + err = errno; + close(s); + goto ret; + } + } + + if (sock->nodelay) { int b = TRUE; - setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); + if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, + (void *) &b, sizeof(b)) < 0) { + err = errno; + close(s); + goto ret; + } } - if (nodelay) { + if (sock->keepalive) { int b = TRUE; - setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); + if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, + (void *) &b, sizeof(b)) < 0) { + err = errno; + close(s); + goto ret; + } } /* * Bind to local address. */ - if (privport) + if (sock->privport) localport = 1023; /* count from 1023 downwards */ else localport = 0; /* just use port 0 (ie kernel picks) */ - /* Loop round trying to bind */ - while (1) { - int retcode; - -#ifdef IPV6 - if (addr->family == AF_INET6) { - /* XXX use getaddrinfo to get a local address? */ - a6.sin6_family = AF_INET6; - a6.sin6_addr = in6addr_any; - a6.sin6_port = htons(localport); - retcode = bind(s, (struct sockaddr *) &a6, sizeof(a6)); - } else + /* 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(addr->family == AF_INET); - a.sin_family = AF_INET; - a.sin_addr.s_addr = htonl(INADDR_ANY); - a.sin_port = htons(localport); - retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); - } - if (retcode >= 0) { - err = 0; - break; /* done */ - } else { - err = errno; - if (err != EADDRINUSE) /* failed, for a bad reason */ - break; + { + 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 (localport == 0) - break; /* we're only looping once */ - localport--; - if (localport == 0) - break; /* we might have got to the end */ - } - - if (err) { - ret->error = error_string(err); - return (Socket) ret; + + if (err) + goto ret; } /* * Connect to remote address. */ -#ifdef IPV6 - /* XXX would be better to have got getaddrinfo() to fill in the port. */ - if (addr->family == AF_INET) - ((struct sockaddr_in *)addr->ai->ai_addr)->sin_port = - htons(port); - else { - assert(addr->family == AF_INET6); - ((struct sockaddr_in *)addr->ai->ai_addr)->sin_port = - htons(port); - } + 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 - a.sin_family = AF_INET; - a.sin_addr.s_addr = htonl(addr->address); - a.sin_port = htons((short) port); + 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(sock->port == 0); /* to catch confused people */ + 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; - fl = fcntl(s, F_GETFL); - if (fl != -1) - fcntl(s, F_SETFL, fl | O_NONBLOCK); + default: + assert(0 && "unknown address family"); + exit(1); /* XXX: GCC doesn't understand assert() on some systems. */ + } - if (( -#ifdef IPV6 - connect(s, addr->ai->ai_addr, addr->ai->ai_addrlen) -#else - connect(s, (struct sockaddr *) &a, sizeof(a)) -#endif - ) < 0) { + nonblock(s); + + if ((connect(s, &(sa->sa), salen)) < 0) { if ( errno != EINPROGRESS ) { - ret->error = error_string(errno); - return (Socket) ret; + 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. */ - ret->connected = 1; - ret->writable = 1; + sock->connected = 1; + sock->writable = 1; } - uxsel_tell(ret); - add234(sktree, ret); + uxsel_tell(sock); + + ret: - sk_addr_free(addr); + /* + * No matter what happened, put the socket back in the tree. + */ + add234(sktree, sock); + + if (err) + plug_log(sock->plug, 1, sock->addr, sock->port, strerror(err), err); + return err; +} + +Socket sk_new(SockAddr addr, int port, int privport, int oobinline, + int nodelay, int keepalive, Plug plug) +{ + Actual_Socket ret; + int err; + + /* + * Create Socket structure. + */ + ret = snew(struct Socket_tag); + ret->fn = &tcp_fn_table; + ret->error = NULL; + ret->plug = plug; + bufchain_init(&ret->output_data); + ret->connected = 0; /* to start with */ + ret->writable = 0; /* to start with */ + ret->sending_oob = 0; + ret->frozen = 0; + ret->localhost_only = 0; /* 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 = 0; + 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; + + err = 0; + do { + err = try_connect(ret); + } while (err && sk_nextaddr(ret->addr, &ret->step)); + + if (err) + ret->error = strerror(err); return (Socket) ret; } -Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) +Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int orig_address_family) { int s; -#ifdef IPV6 -#if 0 - struct sockaddr_in6 a6; -#endif +#ifndef NO_IPV6 struct addrinfo hints, *ai; char portstr[6]; #endif - struct sockaddr_in a; - int err; + union sockaddr_union u; + union sockaddr_union *addr; + int addrlen; Actual_Socket ret; int retcode; + int address_family; int on = 1; /* @@ -553,103 +793,165 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) ret->writable = 0; /* to start with */ ret->sending_oob = 0; ret->frozen = 0; - ret->frozen_readable = 0; 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 = 1; + ret->addr = NULL; + + /* + * 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(AF_INET, SOCK_STREAM, 0); - ret->s = s; + 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 = error_string(errno); + ret->error = strerror(errno); return (Socket) ret; } - ret->oobinline = 0; + cloexec(s); - setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); + ret->oobinline = 0; -#ifdef IPV6 - hints.ai_flags = AI_NUMERICHOST; - hints.ai_family = AF_UNSPEC; - hints.ai_socktype = 0; - hints.ai_protocol = 0; - hints.ai_addrlen = 0; - hints.ai_addr = NULL; - hints.ai_canonname = NULL; - hints.ai_next = NULL; - sprintf(portstr, "%d", port); - if (srcaddr != NULL && getaddrinfo(srcaddr, portstr, &hints, &ai) == 0) - retcode = bind(s, ai->ai_addr, ai->ai_addrlen); - else -#if 0 - { - /* - * FIXME: Need two listening sockets, in principle, one for v4 - * and one for v6 - */ - if (local_host_only) - a6.sin6_addr = in6addr_loopback; - else - a6.sin6_addr = in6addr_any; - a6.sin6_port = htons(port); - } else -#endif -#endif - { - int got_addr = 0; - a.sin_family = AF_INET; + if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, + (const char *)&on, sizeof(on)) < 0) { + ret->error = strerror(errno); + close(s); + return (Socket) ret; + } - /* - * Bind to source address. First try an explicitly - * specified one... - */ - if (srcaddr) { - a.sin_addr.s_addr = inet_addr(srcaddr); - if (a.sin_addr.s_addr != INADDR_NONE) { - /* Override localhost_only with specified listen addr. */ - ret->localhost_only = ipv4_is_loopback(a.sin_addr); - got_addr = 1; - } + 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); + retcode = getaddrinfo(srcaddr, portstr, &hints, &ai); + 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 + } - /* - * ... and failing that, go with one of the standard ones. - */ - if (!got_addr) { + 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) - a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); + u.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); else - a.sin_addr.s_addr = htonl(INADDR_ANY); - } - - a.sin_port = htons((short)port); - retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); - } - - if (retcode >= 0) { - err = 0; - } else { - err = errno; + u.sin.sin_addr.s_addr = htonl(INADDR_ANY); + addr = &u; + addrlen = sizeof(u.sin); + } } - if (err) { - ret->error = error_string(err); + retcode = bind(s, &addr->sa, addrlen); + if (retcode < 0) { + close(s); + ret->error = strerror(errno); return (Socket) ret; } - if (listen(s, SOMAXCONN) < 0) { close(s); - ret->error = error_string(errno); + ret->error = strerror(errno); return (Socket) ret; } +#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) { + Actual_Socket other; + + other = (Actual_Socket) sk_newlistener(srcaddr, port, plug, + local_host_only, ADDRTYPE_IPV4); + + 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 (Socket) other; + } + } + } +#endif + + ret->s = s; + uxsel_tell(ret); add234(sktree, ret); @@ -660,39 +962,67 @@ static void sk_tcp_close(Socket sock) { Actual_Socket s = (Actual_Socket) sock; + if (s->child) + sk_tcp_close((Socket)s->child); + uxsel_del(s->s); del234(sktree, s); close(s->s); + if (s->addr) + sk_addr_free(s->addr); sfree(s); } -int sk_getxdmdata(void *sock, unsigned long *ip, int *port) +void *sk_getxdmdata(void *sock, int *lenp) { Actual_Socket s = (Actual_Socket) sock; - struct sockaddr_in addr; + union sockaddr_union u; socklen_t addrlen; + char *buf; + static unsigned int unix_addr = 0xFFFFFFFF; /* * We must check that this socket really _is_ an Actual_Socket. */ if (s->fn != &tcp_fn_table) - return 0; /* failure */ - - /* - * If we ever implement connecting to a local X server through - * a Unix socket, we return 0xFFFFFFFF for the IP address and - * our current pid for the port. Bizarre, but such is life. - */ + return NULL; /* failure */ + + 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; - addrlen = sizeof(addr); - if (getsockname(s->s, (struct sockaddr *)&addr, &addrlen) < 0 || - addr.sin_family != AF_INET) - return 0; + /* XXX IPV6 */ - *ip = ntohl(addr.sin_addr.s_addr); - *port = ntohs(addr.sin_port); + default: + return NULL; + } - return 1; + return buf; } /* @@ -725,11 +1055,9 @@ void try_send(Actual_Socket s) */ s->writable = FALSE; return; - } else if (nsent == 0 || - err == ECONNABORTED || err == ECONNRESET) { + } else { /* - * If send() returns CONNABORTED or CONNRESET, we - * unfortunately can't just call plug_closing(), + * 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 @@ -738,12 +1066,17 @@ void try_send(Actual_Socket s) * 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); + /* + * Notify the front end that it might want to call us. + */ + frontend_net_error_pending(); return; - } else { - /* We're inside the Unix frontend here, so we know - * that the frontend handle is unnecessary. */ - logevent(NULL, error_string(err)); - fatalbox("%s", error_string(err)); } } else { if (s->sending_oob) { @@ -758,6 +1091,20 @@ void try_send(Actual_Socket s) } } } + + /* + * 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); } @@ -765,6 +1112,8 @@ static int sk_tcp_write(Socket sock, const char *buf, int len) { Actual_Socket s = (Actual_Socket) sock; + assert(s->outgoingeof == EOF_NO); + /* * Add the data to the buffer list on the socket. */ @@ -789,6 +1138,8 @@ static int sk_tcp_write_oob(Socket sock, const char *buf, int len) { Actual_Socket s = (Actual_Socket) sock; + assert(s->outgoingeof == EOF_NO); + /* * Replace the buffer list on the socket with the data. */ @@ -812,10 +1163,33 @@ static int sk_tcp_write_oob(Socket sock, const char *buf, int len) return s->sending_oob; } +static void sk_tcp_write_eof(Socket sock) +{ + Actual_Socket s = (Actual_Socket) 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 int net_select_result(int fd, int event) { int ret; - int err; char buf[20480]; /* nice big buffer for plenty of speed */ Actual_Socket s; u_long atmark; @@ -839,13 +1213,19 @@ static int net_select_result(int fd, int event) ret = recv(s->s, buf, sizeof(buf), MSG_OOB); noise_ultralight(ret); if (ret <= 0) { - const char *str = (ret == 0 ? "Internal networking trouble" : - error_string(errno)); - /* We're inside the Unix frontend here, so we know - * that the frontend handle is unnecessary. */ - logevent(NULL, str); - fatalbox("%s", str); + return 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; + } return plug_receive(s->plug, 2, buf, ret); } break; @@ -865,18 +1245,20 @@ static int net_select_result(int fd, int event) * On a listening socket, the readability event means a * connection is ready to be accepted. */ - struct sockaddr_in isa; - int addrlen = sizeof(struct sockaddr_in); + union sockaddr_union su; + socklen_t addrlen = sizeof(su); int t; /* socket of connection */ - memset(&isa, 0, sizeof(struct sockaddr_in)); - err = 0; - t = accept(s->s,(struct sockaddr *)&isa,(socklen_t *) &addrlen); + memset(&su, 0, addrlen); + t = accept(s->s, &su.sa, &addrlen); if (t < 0) { break; } - if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) { + nonblock(t); + + if (s->localhost_only && + !sockaddr_is_loopback(&su.sa)) { close(t); /* someone let nonlocal through?! */ } else if (plug_accepting(s->plug, t)) { close(t); /* denied or error */ @@ -890,10 +1272,8 @@ static int net_select_result(int fd, int event) */ /* In the case the socket is still frozen, we don't even bother */ - if (s->frozen) { - s->frozen_readable = 1; + if (s->frozen) break; - } /* * We have received data on the socket. For an oobinline @@ -916,10 +1296,35 @@ static int net_select_result(int fd, int event) } } if (ret < 0) { - return plug_closing(s->plug, error_string(errno), errno, 0); + /* + * An error at this point _might_ be an error reported + * by a non-blocking connect(). So before we return a + * panic status to the user, let's just see whether + * that's the case. + */ + int err = errno; + if (s->addr) { + plug_log(s->plug, 1, s->addr, s->port, strerror(err), err); + while (s->addr && sk_nextaddr(s->addr, &s->step)) { + err = try_connect(s); + } + } + if (err != 0) + return plug_closing(s->plug, strerror(err), err, 0); } else if (0 == ret) { + s->incomingeof = TRUE; /* stop trying to read now */ + uxsel_tell(s); return 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; + } return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); } break; @@ -976,7 +1381,7 @@ void net_pending_errors(void) * An error has occurred on this socket. Pass it to the * plug. */ - plug_closing(s->plug, error_string(s->pending_error), + plug_closing(s->plug, strerror(s->pending_error), s->pending_error, 0); break; } @@ -1021,25 +1426,24 @@ static void sk_tcp_set_frozen(Socket sock, int is_frozen) if (s->frozen == is_frozen) return; s->frozen = is_frozen; - if (!is_frozen && s->frozen_readable) { - char c; - recv(s->s, &c, 1, MSG_PEEK); - } - s->frozen_readable = 0; uxsel_tell(s); } static void uxsel_tell(Actual_Socket s) { int rwx = 0; - if (!s->connected) - rwx |= 2; /* write == connect */ - if (s->connected && !s->frozen) - rwx |= 1 | 4; /* read, except */ - if (bufchain_size(&s->output_data)) - rwx |= 2; /* write */ - if (s->listener) - rwx |= 1; /* read == accept */ + if (!s->pending_error) { + if (s->listener) { + rwx |= 1; /* read == accept */ + } else { + if (!s->connected) + rwx |= 2; /* write == connect */ + if (s->connected && !s->frozen && !s->incomingeof) + rwx |= 1 | 4; /* read, except */ + if (bufchain_size(&s->output_data)) + rwx |= 2; /* write */ + } + } uxsel_set(s->s, rwx, net_select_result); } @@ -1052,3 +1456,54 @@ int net_service_lookup(char *service) else return 0; } + +char *get_hostname(void) +{ + int len = 128; + char *hostname = NULL; + do { + len *= 2; + hostname = sresize(hostname, len, char); + if ((gethostname(hostname, len) < 0) && + (errno != ENAMETOOLONG)) { + sfree(hostname); + hostname = NULL; + break; + } + } while (strlen(hostname) >= len-1); + return hostname; +} + +SockAddr platform_get_x11_unix_address(const char *sockpath, int displaynum) +{ + SockAddr ret = snew(struct SockAddr_tag); + 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; +}