X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=unix%2Fuxnet.c;h=235d6fd97d039d3ed2f97167e68e4285935981ee;hb=f004bcca17a789356c32527a396b68b71a773db2;hp=d649e4c70a14a2e1ab44791935b5d60c1a54a1f8;hpb=9c1f81dd94245154e058ac5e21d6ee52e581ec94;p=PuTTY.git diff --git a/unix/uxnet.c b/unix/uxnet.c index d649e4c7..235d6fd9 100644 --- a/unix/uxnet.c +++ b/unix/uxnet.c @@ -75,18 +75,17 @@ struct Socket_tag { const char *error; int s; Plug plug; - void *private_ptr; bufchain output_data; 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 */ @@ -127,9 +126,12 @@ struct SockAddr_tag { (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 : AF_INET) + (addr)->superfamily == UNIX ? AF_UNIX : \ + (step).curraddr ? AF_INET : AF_INET) #endif /* @@ -222,7 +224,11 @@ SockAddr sk_namelookup(const char *host, char **canonicalname, int address_famil hints.ai_addr = NULL; hints.ai_canonname = NULL; hints.ai_next = NULL; - err = getaddrinfo(host, NULL, &hints, &ret->ais); + { + 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); return ret; @@ -316,10 +322,7 @@ static int sk_nextaddr(SockAddr addr, SockAddrStep *step) 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) { + if (addr->superfamily == UNRESOLVED || addr->superfamily == UNIX) { strncpy(buf, addr->hostname, buflen); buf[buflen-1] = '\0'; } else { @@ -341,7 +344,16 @@ void sk_getaddr(SockAddr addr, char *buf, int buflen) } } -int sk_hostname_is_local(char *name) +int sk_addr_needs_port(SockAddr addr) +{ + if (addr->superfamily == UNRESOLVED || addr->superfamily == UNIX) { + return FALSE; + } else { + return TRUE; + } +} + +int sk_hostname_is_local(const char *name) { return !strcmp(name, "localhost") || !strcmp(name, "::1") || @@ -388,6 +400,11 @@ int sk_address_is_local(SockAddr addr) } } +int sk_address_is_special_local(SockAddr addr) +{ + return addr->superfamily == UNIX; +} + int sk_addrtype(SockAddr addr) { SockAddrStep step; @@ -466,8 +483,7 @@ 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_set_private_ptr(Socket s, void *ptr); -static void *sk_tcp_get_private_ptr(Socket s); +static void sk_tcp_write_eof(Socket s); static void sk_tcp_set_frozen(Socket s, int is_frozen); static const char *sk_tcp_socket_error(Socket s); @@ -476,15 +492,15 @@ 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, sk_tcp_set_frozen, sk_tcp_socket_error }; -Socket sk_register(OSSocket sockfd, Plug plug) +static Socket sk_tcp_accept(accept_ctx_t ctx, Plug plug) { + int sockfd = ctx.i; Actual_Socket ret; /* @@ -498,10 +514,11 @@ 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; @@ -529,7 +546,7 @@ static int try_connect(Actual_Socket sock) const union sockaddr_union *sa; int err = 0; short localport; - int fl, salen, family; + int salen, family; /* * Remove the socket from the tree before we overwrite its @@ -561,17 +578,32 @@ static int try_connect(Actual_Socket sock) if (sock->oobinline) { int b = TRUE; - setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); + 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, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); + if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, + (void *) &b, sizeof(b)) < 0) { + err = errno; + close(s); + goto ret; + } } if (sock->keepalive) { int b = TRUE; - setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b)); + if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, + (void *) &b, sizeof(b)) < 0) { + err = errno; + close(s); + goto ret; + } } /* @@ -669,9 +701,7 @@ static int try_connect(Actual_Socket sock) exit(1); /* XXX: GCC doesn't understand assert() on some systems. */ } - fl = fcntl(s, F_GETFL); - if (fl != -1) - fcntl(s, F_SETFL, fl | O_NONBLOCK); + nonblock(s); if ((connect(s, &(sa->sa), salen)) < 0) { if ( errno != EINPROGRESS ) { @@ -719,11 +749,12 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, 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->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); @@ -749,7 +780,7 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, i { int s; #ifndef NO_IPV6 - struct addrinfo hints, *ai; + struct addrinfo hints, *ai = NULL; char portstr[6]; #endif union sockaddr_union u; @@ -771,13 +802,15 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, i 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; + ret->s = -1; /* * Translate address_family from platform-independent constants @@ -820,7 +853,12 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, i ret->oobinline = 0; - setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); + if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, + (const char *)&on, sizeof(on)) < 0) { + ret->error = strerror(errno); + close(s); + return (Socket) ret; + } retcode = -1; addr = NULL; addrlen = -1; /* placate optimiser */ @@ -837,7 +875,11 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, i hints.ai_next = NULL; assert(port >= 0 && port <= 99999); sprintf(portstr, "%d", port); - retcode = getaddrinfo(srcaddr, portstr, &hints, &ai); + { + 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; @@ -884,6 +926,12 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, i } retcode = bind(s, &addr->sa, addrlen); + +#ifndef NO_IPV6 + if (ai) + freeaddrinfo(ai); +#endif + if (retcode < 0) { close(s); ret->error = strerror(errno); @@ -997,6 +1045,26 @@ void *sk_getxdmdata(void *sock, int *lenp) return buf; } +/* + * Deal with socket errors detected in try_send(). + */ +static void socket_error_callback(void *vs) +{ + Actual_Socket s = (Actual_Socket)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. @@ -1038,6 +1106,17 @@ 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); + /* + * 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 { @@ -1053,6 +1132,20 @@ 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); } @@ -1060,6 +1153,8 @@ 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. */ @@ -1084,6 +1179,8 @@ 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. */ @@ -1107,6 +1204,30 @@ 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; @@ -1167,8 +1288,8 @@ static int net_select_result(int fd, int event) */ union sockaddr_union su; socklen_t addrlen = sizeof(su); + accept_ctx_t actx; int t; /* socket of connection */ - int fl; memset(&su, 0, addrlen); t = accept(s->s, &su.sa, &addrlen); @@ -1176,14 +1297,13 @@ static int net_select_result(int fd, int event) break; } - fl = fcntl(t, F_GETFL); - if (fl != -1) - fcntl(t, F_SETFL, fl | O_NONBLOCK); + nonblock(t); + actx.i = t; - if (s->localhost_only && - !sockaddr_is_loopback(&su.sa)) { + 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, t)) { + } else if (plug_accepting(s->plug, sk_tcp_accept, actx)) { close(t); /* denied or error */ } break; @@ -1195,10 +1315,8 @@ 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 @@ -1237,6 +1355,8 @@ static int net_select_result(int fd, int event) 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 { /* @@ -1275,59 +1395,6 @@ static int net_select_result(int fd, int event) return 1; } -/* - * Deal with socket errors detected in try_send(). - */ -void net_pending_errors(void) -{ - int i; - Actual_Socket s; - - /* - * This might be a fiddly business, because it's just possible - * that handling a pending error on one socket might cause - * others to be closed. (I can't think of any reason this might - * happen in current SSH implementation, but to maintain - * generality of this network layer I'll assume the worst.) - * - * So what we'll do is search the socket list for _one_ socket - * with a pending error, and then handle it, and then search - * the list again _from the beginning_. Repeat until we make a - * pass with no socket errors present. That way we are - * protected against the socket list changing under our feet. - */ - - do { - for (i = 0; (s = index234(sktree, i)) != NULL; i++) { - if (s->pending_error) { - /* - * An error has occurred on this socket. Pass it to the - * plug. - */ - plug_closing(s->plug, strerror(s->pending_error), - s->pending_error, 0); - break; - } - } - } while (s); -} - -/* - * Each socket abstraction contains a `void *' private field in - * which the client can keep state. - */ -static void sk_tcp_set_private_ptr(Socket sock, void *ptr) -{ - Actual_Socket s = (Actual_Socket) sock; - s->private_ptr = ptr; -} - -static void *sk_tcp_get_private_ptr(Socket sock) -{ - Actual_Socket s = (Actual_Socket) sock; - return s->private_ptr; -} - /* * Special error values are returned from sk_namelookup and sk_new * if there's a problem. These functions extract an error message, @@ -1349,26 +1416,23 @@ 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->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 */ + 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); } @@ -1433,3 +1497,105 @@ SockAddr platform_get_x11_unix_address(const char *sockpath, int displaynum) ret->refcount = 1; return ret; } + +SockAddr unix_sock_addr(const char *path) +{ + SockAddr ret = snew(struct SockAddr_tag); + 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) + 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; + Actual_Socket ret; + int retcode; + + /* + * 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->writable = 0; /* to start with */ + ret->sending_oob = 0; + ret->frozen = 0; + 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 = 1; + 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 (Socket) ret; + } + + cloexec(s); + + ret->oobinline = 0; + + memset(&u, '\0', sizeof(u)); + u.su.sun_family = AF_UNIX; + strncpy(u.su.sun_path, listenaddr->hostname, sizeof(u.su.sun_path)-1); + addr = &u; + addrlen = sizeof(u.su); + + if (unlink(u.su.sun_path) < 0 && errno != ENOENT) { + close(s); + ret->error = strerror(errno); + return (Socket) ret; + } + + 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 = strerror(errno); + return (Socket) ret; + } + + ret->s = s; + + uxsel_tell(ret); + add234(sktree, ret); + + return (Socket) ret; +}