X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/c5e438ecf3f6d7b8caab10e43a452f3555149309..51e9d3c00a3471f284e89ec1f59f38ca25f10c5f:/unix/uxnet.c diff --git a/unix/uxnet.c b/unix/uxnet.c index ad25ef5f..46959e2f 100644 --- a/unix/uxnet.c +++ b/unix/uxnet.c @@ -15,21 +15,26 @@ #include #include #include +#include #define DEFINE_PLUG_METHOD_MACROS #include "putty.h" #include "network.h" #include "tree234.h" +#ifndef X11_UNIX_PATH +# define X11_UNIX_PATH "/tmp/.X11-unix/X" +#endif + struct Socket_tag { struct socket_function_table *fn; /* the above variable absolutely *must* be the first in this structure */ - char *error; + const char *error; int s; 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 @@ -41,6 +46,9 @@ struct Socket_tag { int oobinline; int pending_error; /* in case send() returns error */ int listener; + int nodelay, keepalive; /* for connect()-type sockets */ + int privport, port; /* and again */ + SockAddr addr; }; /* @@ -54,17 +62,28 @@ struct Socket_tag { typedef struct Socket_tag *Actual_Socket; struct SockAddr_tag { - char *error; - /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */ + 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; - unsigned long address; /* Address IPv4 style. */ -#ifdef IPV6 - struct addrinfo *ai; /* Address IPv6 style. */ +#ifndef NO_IPV6 + struct addrinfo *ais; /* Addresses IPv6 style. */ + struct addrinfo *ai; /* steps along the linked list */ +#else + unsigned long *addresses; /* Addresses IPv4 style. */ + int naddresses, curraddr; #endif + char hostname[512]; /* Store an unresolved host name. */ }; static tree234 *sktree; +static void uxsel_tell(Actual_Socket s); + static int cmpfortree(void *av, void *bv) { Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; @@ -79,7 +98,7 @@ static int cmpfortree(void *av, void *bv) static int cmpforsearch(void *av, void *bv) { Actual_Socket b = (Actual_Socket) bv; - int as = (int) av, bs = b->s; + int as = *(int *)av, bs = b->s; if (as < bs) return -1; if (as > bs) @@ -104,86 +123,17 @@ void sk_cleanup(void) } } -char *error_string(int error) -{ - switch (error) { - case EACCES: - return "Network error: Permission denied"; - case EADDRINUSE: - return "Network error: Address already in use"; - case EADDRNOTAVAIL: - return "Network error: Cannot assign requested address"; - case EAFNOSUPPORT: - return - "Network error: Address family not supported by protocol family"; - case EALREADY: - return "Network error: Operation already in progress"; - case ECONNABORTED: - return "Network error: Software caused connection abort"; - case ECONNREFUSED: - return "Network error: Connection refused"; - case ECONNRESET: - return "Network error: Connection reset by peer"; - case EDESTADDRREQ: - return "Network error: Destination address required"; - case EFAULT: - return "Network error: Bad address"; - case EHOSTDOWN: - return "Network error: Host is down"; - case EHOSTUNREACH: - return "Network error: No route to host"; - case EINPROGRESS: - return "Network error: Operation now in progress"; - case EINTR: - return "Network error: Interrupted function call"; - case EINVAL: - return "Network error: Invalid argument"; - case EISCONN: - return "Network error: Socket is already connected"; - case EMFILE: - return "Network error: Too many open files"; - case EMSGSIZE: - return "Network error: Message too long"; - case ENETDOWN: - return "Network error: Network is down"; - case ENETRESET: - return "Network error: Network dropped connection on reset"; - case ENETUNREACH: - return "Network error: Network is unreachable"; - case ENOBUFS: - return "Network error: No buffer space available"; - case ENOPROTOOPT: - return "Network error: Bad protocol option"; - case ENOTCONN: - return "Network error: Socket is not connected"; - case ENOTSOCK: - return "Network error: Socket operation on non-socket"; - case EOPNOTSUPP: - return "Network error: Operation not supported"; - case EPFNOSUPPORT: - return "Network error: Protocol family not supported"; - case EPROTONOSUPPORT: - return "Network error: Protocol not supported"; - case EPROTOTYPE: - return "Network error: Protocol wrong type for socket"; - case ESHUTDOWN: - return "Network error: Cannot send after socket shutdown"; - case ESOCKTNOSUPPORT: - return "Network error: Socket type not supported"; - case ETIMEDOUT: - return "Network error: Connection timed out"; - case EWOULDBLOCK: - return "Network error: Resource temporarily unavailable"; - default: - return "Unknown network error"; - } -} - -SockAddr sk_namelookup(char *host, char **canonicalname) +SockAddr sk_namelookup(const char *host, char **canonicalname, int address_family) { - SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); + SockAddr ret = snew(struct SockAddr_tag); +#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. */ @@ -192,58 +142,57 @@ SockAddr sk_namelookup(char *host, char **canonicalname) *realhost = '\0'; ret->error = NULL; - if ((a = inet_addr(host)) == (unsigned long) INADDR_NONE) { -#ifdef IPV6 - if (getaddrinfo(host, NULL, NULL, &ret->ai) == 0) { - ret->family = ret->ai->ai_family; - } else -#endif - { - /* - * 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->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"); +#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; + err = getaddrinfo(host, NULL, &hints, &ret->ais); + ret->ai = ret->ais; + if (err != 0) { + ret->error = gai_strerror(err); + return ret; + } + ret->family = ret->ai->ai_family; + *realhost = '\0'; + if (ret->ai->ai_canonname != NULL) + strncat(realhost, ret->ai->ai_canonname, sizeof(realhost) - 1); + else + strncat(realhost, host, sizeof(realhost) - 1); +#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->family == 0) { + /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ + if ( (h = gethostbyname(host)) ) + ret->family = AF_INET; } - -#ifdef IPV6 - /* If we got an address info use that... */ - if (ret->ai) { - - /* Are we in IPv4 fallback mode? */ - /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ - if (ret->family == AF_INET) - memcpy(&a, - (char *) &((struct sockaddr_in *) ret->ai-> - ai_addr)->sin_addr, sizeof(a)); - - /* Now let's find that canonicalname... */ - if (getnameinfo((struct sockaddr *) ret->ai->ai_addr, - ret->family == - AF_INET ? sizeof(struct sockaddr_in) : - sizeof(struct sockaddr_in6), realhost, - sizeof(realhost), NULL, 0, 0) != 0) { - strncpy(realhost, host, sizeof(realhost)); - } + 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; } - /* We used the IPv4-only gethostbyname()... */ - else -#endif - { - 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)); + /* 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 { /* @@ -252,51 +201,162 @@ SockAddr sk_namelookup(char *host, char **canonicalname) */ ret->family = AF_INET; strncpy(realhost, host, sizeof(realhost)); + ret->addresses = snew(unsigned long); + ret->naddresses = 1; + ret->addresses[0] = ntohl(a); + ret->curraddr = 0; } - ret->address = ntohl(a); +#endif realhost[lenof(realhost)-1] = '\0'; - *canonicalname = smalloc(1+strlen(realhost)); + *canonicalname = snewn(1+strlen(realhost), char); strcpy(*canonicalname, realhost); return ret; } -void sk_getaddr(SockAddr addr, char *buf, int buflen) +SockAddr sk_nonamelookup(const char *host) { -#ifdef IPV6 - if (addr->family == AF_INET) { + SockAddr ret = snew(struct SockAddr_tag); + ret->error = NULL; + ret->family = AF_UNSPEC; + 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 - struct in_addr a; - a.s_addr = htonl(addr->address); - strncpy(buf, inet_ntoa(a), buflen); -#ifdef IPV6 + return ret; +} + +static int sk_nextaddr(SockAddr addr) +{ +#ifndef NO_IPV6 + if (addr->ai->ai_next) { + addr->ai = addr->ai->ai_next; + addr->family = addr->ai->ai_family; + return TRUE; + } else + return FALSE; +#else + if (addr->curraddr+1 < addr->naddresses) { + addr->curraddr++; + return TRUE; } else { - FIXME; /* I don't know how to get a text form of an IPv6 address. */ + return FALSE; } +#endif +} + +void sk_getaddr(SockAddr addr, char *buf, int buflen) +{ + + if (addr->family == AF_UNSPEC) { + strncpy(buf, addr->hostname, buflen); + buf[buflen-1] = '\0'; + } else { +#ifndef NO_IPV6 + if (getnameinfo(addr->ai->ai_addr, addr->ai->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->addresses[addr->curraddr]); + strncpy(buf, inet_ntoa(a), buflen); + buf[buflen-1] = '\0'; #endif + } } -int sk_addrtype(SockAddr addr) +int sk_hostname_is_local(char *name) { - return (addr->family == AF_INET ? ADDRTYPE_IPV4 : ADDRTYPE_IPV6); + return !strcmp(name, "localhost"); } -void sk_addrcopy(SockAddr addr, char *buf) +#define ipv4_is_loopback(addr) \ + (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000)) + +static int sockaddr_is_loopback(struct sockaddr *sa) { -#ifdef IPV6 - if (addr->family == AF_INET) { + struct sockaddr_in *sin; +#ifndef NO_IPV6 + struct sockaddr_in6 *sin6; +#endif + + switch (sa->sa_family) { + case AF_INET: + sin = (struct sockaddr_in *)sa; + return ipv4_is_loopback(sin->sin_addr); +#ifndef NO_IPV6 + case AF_INET6: + sin6 = (struct sockaddr_in6 *)sa; + return IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr); #endif + case AF_UNIX: + return TRUE; + default: + return FALSE; + } +} + +int sk_address_is_local(SockAddr addr) +{ + + if (addr->family == AF_UNSPEC) + return 0; /* we don't know; assume not */ + else { +#ifndef NO_IPV6 + return sockaddr_is_loopback(addr->ai->ai_addr); +#else struct in_addr a; - a.s_addr = htonl(addr->address); - memcpy(buf, (char*) &a.s_addr, 4); -#ifdef IPV6 - } else { - memcpy(buf, (char*) addr->ai, 16); + assert(addr->family == AF_INET); + a.s_addr = htonl(addr->addresses[addr->curraddr]); + return ipv4_is_loopback(a); +#endif } +} + +int sk_addrtype(SockAddr addr) +{ + return (addr->family == AF_INET ? ADDRTYPE_IPV4 : +#ifndef NO_IPV6 + addr->family == AF_INET6 ? ADDRTYPE_IPV6 : +#endif + ADDRTYPE_NAME); +} + +void sk_addrcopy(SockAddr addr, char *buf) +{ + +#ifndef NO_IPV6 + if (addr->family == AF_INET) + memcpy(buf, &((struct sockaddr_in *)addr->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, + sizeof(struct in6_addr)); + else + assert(FALSE); +#else + struct in_addr a; + + assert(addr->family == AF_INET); + a.s_addr = htonl(addr->addresses[addr->curraddr]); + memcpy(buf, (char*) &a.s_addr, 4); #endif } void sk_addr_free(SockAddr addr) { + +#ifndef NO_IPV6 + if (addr->ais != NULL) + freeaddrinfo(addr->ais); +#else + sfree(addr->addresses); +#endif sfree(addr); } @@ -318,34 +378,34 @@ static void sk_tcp_flush(Socket s) } static void sk_tcp_close(Socket s); -static int sk_tcp_write(Socket s, char *data, int len); -static int sk_tcp_write_oob(Socket s, char *data, int len); +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_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); -static char *sk_tcp_socket_error(Socket s); - -Socket sk_register(void *sock, Plug plug) -{ - static struct socket_function_table fn_table = { - sk_tcp_plug, - sk_tcp_close, - sk_tcp_write, - sk_tcp_write_oob, - sk_tcp_flush, - sk_tcp_set_private_ptr, - sk_tcp_get_private_ptr, - sk_tcp_set_frozen, - sk_tcp_socket_error - }; +static const char *sk_tcp_socket_error(Socket s); + +static struct socket_function_table tcp_fn_table = { + sk_tcp_plug, + sk_tcp_close, + sk_tcp_write, + sk_tcp_write_oob, + sk_tcp_flush, + sk_tcp_set_private_ptr, + sk_tcp_get_private_ptr, + sk_tcp_set_frozen, + sk_tcp_socket_error +}; +Socket sk_register(OSSocket sockfd, Plug plug) +{ Actual_Socket ret; /* * Create Socket structure. */ - ret = smalloc(sizeof(struct Socket_tag)); - ret->fn = &fn_table; + ret = snew(struct Socket_tag); + ret->fn = &tcp_fn_table; ret->error = NULL; ret->plug = plug; bufchain_init(&ret->output_data); @@ -357,211 +417,247 @@ Socket sk_register(void *sock, Plug plug) ret->pending_error = 0; ret->oobpending = FALSE; ret->listener = 0; + ret->addr = NULL; + ret->connected = 1; - ret->s = (int)sock; + ret->s = sockfd; if (ret->s < 0) { - ret->error = error_string(errno); + ret->error = strerror(errno); return (Socket) ret; } ret->oobinline = 0; + uxsel_tell(ret); add234(sktree, ret); return (Socket) ret; } -Socket sk_new(SockAddr addr, int port, int privport, int oobinline, - int nodelay, Plug plug) -{ - static struct socket_function_table fn_table = { - sk_tcp_plug, - sk_tcp_close, - sk_tcp_write, - sk_tcp_write_oob, - sk_tcp_flush, - sk_tcp_set_private_ptr, - sk_tcp_get_private_ptr, - sk_tcp_set_frozen, - sk_tcp_socket_error - }; - +static int try_connect(Actual_Socket sock) +{ int s; -#ifdef IPV6 +#ifndef NO_IPV6 struct sockaddr_in6 a6; #endif struct sockaddr_in a; - int err; - Actual_Socket ret; + struct sockaddr_un au; + const struct sockaddr *sa; + int err = 0; short localport; + int fl, salen; - /* - * Create Socket structure. - */ - ret = smalloc(sizeof(struct Socket_tag)); - ret->fn = &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; + if (sock->s >= 0) + close(sock->s); + + plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0); /* * Open socket. */ - s = socket(addr->family, SOCK_STREAM, 0); - ret->s = s; + assert(sock->addr->family != AF_UNSPEC); + s = socket(sock->addr->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) { + if (sock->oobinline) { int b = TRUE; setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); } - if (nodelay) { + if (sock->nodelay) { int b = TRUE; setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); } + if (sock->keepalive) { + int b = TRUE; + setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b)); + } + /* * 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) { - memset(&a6, 0, sizeof(a6)); - a6.sin6_family = AF_INET6; -/*a6.sin6_addr = in6addr_any; *//* == 0 */ - a6.sin6_port = htons(localport); - } else + /* BSD IP stacks need sockaddr_in zeroed before filling in */ + memset(&a,'\0',sizeof(struct sockaddr_in)); +#ifndef NO_IPV6 + memset(&a6,'\0',sizeof(struct sockaddr_in6)); #endif - { - a.sin_family = AF_INET; - a.sin_addr.s_addr = htonl(INADDR_ANY); - a.sin_port = htons(localport); - } -#ifdef IPV6 - retcode = bind(s, (addr->family == AF_INET6 ? - (struct sockaddr *) &a6 : - (struct sockaddr *) &a), - (addr->family == - AF_INET6 ? sizeof(a6) : sizeof(a))); -#else - retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); + + /* 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(sock->addr->family != AF_UNIX) { + /* Loop round trying to bind */ + while (1) { + int retcode; + +#ifndef NO_IPV6 + if (sock->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 #endif - if (retcode >= 0) { - err = 0; - break; /* done */ - } else { - err = errno; - if (err != EADDRINUSE) /* failed, for a bad reason */ - break; + { + assert(sock->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; + } + + 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 - if (addr->family == AF_INET6) { - memset(&a, 0, sizeof(a)); - a6.sin6_family = AF_INET6; - a6.sin6_port = htons((short) port); - a6.sin6_addr = - ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr; - } else -#endif - { + switch(sock->addr->family) { +#ifndef NO_IPV6 + case AF_INET: + /* XXX would be better to have got getaddrinfo() to fill in the port. */ + ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port = + htons(sock->port); + sa = (const struct sockaddr *)sock->addr->ai->ai_addr; + salen = sock->addr->ai->ai_addrlen; + break; + case AF_INET6: + ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port = + htons(sock->port); + sa = (const struct sockaddr *)sock->addr->ai->ai_addr; + salen = sock->addr->ai->ai_addrlen; + break; +#else + case AF_INET: a.sin_family = AF_INET; - a.sin_addr.s_addr = htonl(addr->address); - a.sin_port = htons((short) port); + a.sin_addr.s_addr = htonl(sock->addr->addresses[sock->addr->curraddr]); + a.sin_port = htons((short) sock->port); + sa = (const struct sockaddr *)&a; + salen = sizeof a; + break; +#endif + case AF_UNIX: + assert(sock->port == 0); /* to catch confused people */ + assert(strlen(sock->addr->hostname) < sizeof au.sun_path); + memset(&au, 0, sizeof au); + au.sun_family = AF_UNIX; + strcpy(au.sun_path, sock->addr->hostname); + sa = (const struct sockaddr *)&au; + salen = sizeof au; + break; + + default: + assert(0 && "unknown address family"); } - if (( -#ifdef IPV6 - connect(s, ((addr->family == AF_INET6) ? - (struct sockaddr *) &a6 : (struct sockaddr *) &a), - (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) -#else - connect(s, (struct sockaddr *) &a, sizeof(a)) -#endif - ) < 0) { - /* - * FIXME: We are prepared to receive EWOULDBLOCK here, - * because we might want the connection to be made - * asynchronously; but how do we actually arrange this in - * Unix? I forget. - */ - if ( errno != EWOULDBLOCK ) { - ret->error = error_string(errno); - return (Socket) ret; + fl = fcntl(s, F_GETFL); + if (fl != -1) + fcntl(s, F_SETFL, fl | O_NONBLOCK); + + if ((connect(s, 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. */ - ret->connected = 1; - ret->writable = 1; + sock->connected = 1; + sock->writable = 1; } - add234(sktree, ret); + uxsel_tell(sock); + add234(sktree, sock); - return (Socket) ret; + ret: + if (err) + plug_log(sock->plug, 1, sock->addr, sock->port, strerror(err), err); + return err; } -Socket sk_newlistener(int port, Plug plug, int local_host_only) +Socket sk_new(SockAddr addr, int port, int privport, int oobinline, + int nodelay, int keepalive, Plug plug) { - static struct socket_function_table fn_table = { - sk_tcp_plug, - sk_tcp_close, - sk_tcp_write, - sk_tcp_write_oob, - sk_tcp_flush, - sk_tcp_set_private_ptr, - sk_tcp_get_private_ptr, - sk_tcp_set_frozen, - sk_tcp_socket_error - }; + 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->frozen_readable = 0; + ret->localhost_only = 0; /* unused, but best init anyway */ + ret->pending_error = 0; + ret->oobpending = FALSE; + ret->listener = 0; + ret->addr = addr; + 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)); + + if (err) + ret->error = strerror(err); + + return (Socket) ret; +} + +Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int address_family) +{ int s; -#ifdef IPV6 +#ifndef NO_IPV6 + struct addrinfo hints, *ai; + char portstr[6]; struct sockaddr_in6 a6; #endif + struct sockaddr *addr; + int addrlen; struct sockaddr_in a; - int err; Actual_Socket ret; int retcode; int on = 1; @@ -569,8 +665,8 @@ Socket sk_newlistener(int port, Plug plug, int local_host_only) /* * Create Socket structure. */ - ret = smalloc(sizeof(struct Socket_tag)); - ret->fn = &fn_table; + ret = snew(struct Socket_tag); + ret->fn = &tcp_fn_table; ret->error = NULL; ret->plug = plug; bufchain_init(&ret->output_data); @@ -582,15 +678,37 @@ Socket sk_newlistener(int port, Plug plug, int local_host_only) ret->pending_error = 0; ret->oobpending = FALSE; ret->listener = 1; + ret->addr = NULL; + + /* + * Translate address_family from platform-independent constants + * into local reality. + */ + address_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : + address_family == ADDRTYPE_IPV6 ? AF_INET6 : 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); + + /* 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); + } if (s < 0) { - ret->error = error_string(errno); + ret->error = strerror(errno); return (Socket) ret; } @@ -598,52 +716,84 @@ Socket sk_newlistener(int port, Plug plug, int local_host_only) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); -#ifdef IPV6 - if (addr->family == AF_INET6) { - memset(&a6, 0, sizeof(a6)); - a6.sin6_family = AF_INET6; - if (local_host_only) - a6.sin6_addr = in6addr_loopback; - else - a6.sin6_addr = in6addr_any; - a6.sin6_port = htons(port); - } else + 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 = ai->ai_addr; + addrlen = ai->ai_addrlen; + } +#else + memset(&a,'\0',sizeof(struct sockaddr_in)); + a.sin_family = AF_INET; + a.sin_port = htons(port); + a.sin_addr.s_addr = inet_addr(srcaddr); + if (a.sin_addr.s_addr != (in_addr_t)(-1)) { + /* Override localhost_only with specified listen addr. */ + ret->localhost_only = ipv4_is_loopback(a.sin_addr); + } + addr = (struct sockaddr *)&a; + addrlen = sizeof(a); + retcode = 0; #endif - { - a.sin_family = AF_INET; - if (local_host_only) - a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); - else - a.sin_addr.s_addr = htonl(INADDR_ANY); - a.sin_port = htons((short)port); } -#ifdef IPV6 - retcode = bind(s, (addr->family == AF_INET6 ? - (struct sockaddr *) &a6 : - (struct sockaddr *) &a), - (addr->family == - AF_INET6 ? sizeof(a6) : sizeof(a))); -#else - retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); + + if (retcode != 0) { +#ifndef NO_IPV6 + if (address_family == AF_INET6) { + memset(&a6,'\0',sizeof(struct sockaddr_in6)); + a6.sin6_family = AF_INET6; + a6.sin6_port = htons(port); + if (local_host_only) + a6.sin6_addr = in6addr_loopback; + else + a6.sin6_addr = in6addr_any; + addr = (struct sockaddr *)&a6; + addrlen = sizeof(a6); + } else #endif - if (retcode >= 0) { - err = 0; - } else { - err = errno; + { + memset(&a,'\0',sizeof(struct sockaddr_in)); + a.sin_family = AF_INET; + a.sin_port = htons(port); + if (local_host_only) + a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); + else + a.sin_addr.s_addr = htonl(INADDR_ANY); + addr = (struct sockaddr *)&a; + addrlen = sizeof(a); + } } - if (err) { - ret->error = error_string(err); + retcode = bind(s, addr, 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; } + ret->s = s; + + uxsel_tell(ret); add234(sktree, ret); return (Socket) ret; @@ -653,11 +803,73 @@ static void sk_tcp_close(Socket sock) { Actual_Socket s = (Actual_Socket) sock; + uxsel_del(s->s); del234(sktree, s); close(s->s); + if (s->addr) + sk_addr_free(s->addr); sfree(s); } +void *sk_getxdmdata(void *sock, int *lenp) +{ + Actual_Socket s = (Actual_Socket) sock; +#ifdef NO_IPV6 + struct sockaddr_in addr; +#else + struct sockaddr_storage addr; + struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr; +#endif + struct sockaddr *sa = (struct sockaddr *)&addr; + struct sockaddr_in *sin = (struct sockaddr_in *)&addr; + 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 NULL; /* failure */ + + addrlen = sizeof(addr); + if (getsockname(s->s, sa, &addrlen) < 0) + return NULL; + switch(sa->sa_family) { + case AF_INET: + *lenp = 6; + buf = snewn(*lenp, char); + PUT_32BIT_MSB_FIRST(buf, ntohl(sin->sin_addr.s_addr)); + PUT_16BIT_MSB_FIRST(buf+4, ntohs(sin->sin_port)); + break; +#ifndef NO_IPV6 + case AF_INET6: + *lenp = 6; + buf = snewn(*lenp, char); + if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { + memcpy(buf, sin6->sin6_addr.s6_addr + 12, 4); + PUT_16BIT_MSB_FIRST(buf+4, ntohs(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; +} + /* * The function which tries to send on a socket once it's deemed * writable. @@ -688,11 +900,9 @@ 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 @@ -702,11 +912,6 @@ void try_send(Actual_Socket s) */ s->pending_error = err; 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) { @@ -721,9 +926,10 @@ void try_send(Actual_Socket s) } } } + uxsel_tell(s); } -static int sk_tcp_write(Socket sock, char *buf, int len) +static int sk_tcp_write(Socket sock, const char *buf, int len) { Actual_Socket s = (Actual_Socket) sock; @@ -738,10 +944,16 @@ static int sk_tcp_write(Socket sock, char *buf, int len) 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 int sk_tcp_write_oob(Socket sock, char *buf, int len) +static int sk_tcp_write_oob(Socket sock, const char *buf, int len) { Actual_Socket s = (Actual_Socket) sock; @@ -759,30 +971,30 @@ static int sk_tcp_write_oob(Socket sock, char *buf, int len) 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; } -int select_result(int fd, int event) +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; /* Find the Socket structure */ - s = find234(sktree, (void *) fd, cmpforsearch); + s = find234(sktree, &fd, cmpforsearch); if (!s) return 1; /* boggle */ noise_ultralight(event); switch (event) { -#ifdef FIXME_NONBLOCKING_CONNECTIONS - case FIXME: /* connected */ - s->connected = s->writable = 1; - break; -#endif case 4: /* exceptional */ if (!s->oobinline) { /* @@ -794,13 +1006,19 @@ int select_result(int fd, int event) ret = recv(s->s, buf, sizeof(buf), MSG_OOB); noise_ultralight(ret); if (ret <= 0) { - 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; @@ -808,31 +1026,36 @@ int select_result(int fd, int event) /* * If we reach here, this is an oobinline socket, which - * means we should set s->oobpending and then fall through - * to the read case. + * 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 1: /* readable; also acceptance */ if (s->listener) { /* * 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); +#ifdef NO_IPV6 + struct sockaddr_in ss; +#else + struct sockaddr_storage ss; +#endif + socklen_t addrlen = sizeof(ss); int t; /* socket of connection */ - memset(&isa, 0, sizeof(struct sockaddr_in)); - err = 0; - t = accept(s->s,(struct sockaddr *)&isa,&addrlen); + memset(&ss, 0, addrlen); + t = accept(s->s, (struct sockaddr *)&ss, &addrlen); if (t < 0) { break; } if (s->localhost_only && - ntohl(isa.sin_addr.s_addr) != INADDR_LOOPBACK) { + !sockaddr_is_loopback((struct sockaddr *)&ss)) { close(t); /* someone let nonlocal through?! */ - } else if (plug_accepting(s->plug, (void*)t)) { + } else if (plug_accepting(s->plug, t)) { close(t); /* denied or error */ } break; @@ -862,7 +1085,7 @@ int select_result(int fd, int event) } else atmark = 1; - ret = recv(s->s, buf, sizeof(buf), 0); + ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0); noise_ultralight(ret); if (ret < 0) { if (errno == EWOULDBLOCK) { @@ -870,15 +1093,46 @@ int 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)) { + err = try_connect(s); + } + } + if (err != 0) + return plug_closing(s->plug, strerror(err), err, 0); } else if (0 == ret) { 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; case 2: /* writable */ - { + if (!s->connected) { + /* + * select() reports a socket as _writable_ when an + * asynchronous connection is completed. + */ + s->connected = s->writable = 1; + uxsel_tell(s); + break; + } else { int bufsize_before, bufsize_after; s->writable = 1; bufsize_before = s->sending_oob + bufchain_size(&s->output_data); @@ -922,7 +1176,7 @@ 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; } @@ -951,11 +1205,11 @@ static void *sk_tcp_get_private_ptr(Socket sock) * if there's a problem. These functions extract an error message, * or return NULL if there's no problem. */ -char *sk_addr_error(SockAddr addr) +const char *sk_addr_error(SockAddr addr) { return addr->error; } -static char *sk_tcp_socket_error(Socket sock) +static const char *sk_tcp_socket_error(Socket sock) { Actual_Socket s = (Actual_Socket) sock; return s->error; @@ -972,42 +1226,23 @@ static void sk_tcp_set_frozen(Socket sock, int is_frozen) recv(s->s, &c, 1, MSG_PEEK); } s->frozen_readable = 0; + uxsel_tell(s); } -/* - * For Unix select()-based frontends: enumerate all sockets - * currently active, and state whether we currently wish to receive - * select events on them for reading, writing and exceptional - * status. - */ -static void set_rwx(Actual_Socket s, int *rwx) +static void uxsel_tell(Actual_Socket s) { - int val = 0; - if (s->connected && !s->frozen) - val |= 1 | 4; /* read, except */ - if (bufchain_size(&s->output_data)) - val |= 2; /* write */ - if (s->listener) - val |= 1; /* read == accept */ - *rwx = val; -} - -int first_socket(int *state, int *rwx) -{ - Actual_Socket s; - *state = 0; - s = index234(sktree, (*state)++); - if (s) - set_rwx(s, rwx); - return s ? s->s : -1; -} - -int next_socket(int *state, int *rwx) -{ - Actual_Socket s = index234(sktree, (*state)++); - if (s) - set_rwx(s, rwx); - return s ? s->s : -1; + int rwx = 0; + if (s->listener) { + rwx |= 1; /* read == accept */ + } else { + 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 */ + } + uxsel_set(s->s, rwx, net_select_result); } int net_service_lookup(char *service) @@ -1019,3 +1254,26 @@ int net_service_lookup(char *service) else return 0; } + +SockAddr platform_get_x11_unix_address(int displaynum, char **canonicalname) +{ + SockAddr ret = snew(struct SockAddr_tag); + int n; + + memset(ret, 0, sizeof *ret); + ret->family = AF_UNIX; + 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"; + else + *canonicalname = dupstr(ret->hostname); +#ifndef NO_IPV6 + ret->ais = NULL; +#else + ret->addresses = NULL; +#endif + return ret; +}