X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/ab0873ab80d0c927315329be0cbeb96bb4ace89a..cbe2d68fd7c7c7bac692b3a2d200a5d2429ab201:/unix/uxnet.c diff --git a/unix/uxnet.c b/unix/uxnet.c index 82b413dc..77a4885b 100644 --- a/unix/uxnet.c +++ b/unix/uxnet.c @@ -26,7 +26,7 @@ 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; @@ -56,7 +56,7 @@ struct Socket_tag { typedef struct Socket_tag *Actual_Socket; struct SockAddr_tag { - char *error; + const char *error; /* * Which address family this address belongs to. AF_INET for * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name @@ -64,15 +64,18 @@ struct SockAddr_tag { * in this SockAddr structure. */ int family; - unsigned long address; /* Address IPv4 style. */ #ifdef IPV6 struct addrinfo *ai; /* Address IPv6 style. */ +#else + unsigned long address; /* Address IPv4 style. */ #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; @@ -112,16 +115,21 @@ void sk_cleanup(void) } } -char *error_string(int error) +const char *error_string(int error) { return strerror(error); } -SockAddr sk_namelookup(char *host, char **canonicalname) +SockAddr sk_namelookup(const char *host, char **canonicalname) { - SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); + SockAddr ret = snew(struct SockAddr_tag); +#ifdef IPV6 + struct addrinfo hints; + int err; +#else unsigned long a; struct hostent *h = NULL; +#endif char realhost[8192]; /* Clear the structure and default to IPv4. */ @@ -130,61 +138,49 @@ 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) { + hints.ai_flags = AI_CANONNAME; + 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; + err = getaddrinfo(host, NULL, NULL, &ret->ai); + 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) INADDR_NONE) { + /* + * 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->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"); + 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; - } - } - -#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)); - } - } - /* 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)); } + 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)); } else { /* * This must be a numeric IPv4 address because it caused a @@ -194,15 +190,16 @@ SockAddr sk_namelookup(char *host, char **canonicalname) strncpy(realhost, host, sizeof(realhost)); } 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; } -SockAddr sk_nonamelookup(char *host) +SockAddr sk_nonamelookup(const char *host) { - SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); + SockAddr ret = snew(struct SockAddr_tag); ret->error = NULL; ret->family = AF_UNSPEC; strncpy(ret->hostname, host, lenof(ret->hostname)); @@ -212,20 +209,24 @@ SockAddr sk_nonamelookup(char *host) void sk_getaddr(SockAddr addr, char *buf, int buflen) { + + if (addr->family == AF_UNSPEC) { + strncpy(buf, addr->hostname, buflen); + buf[buflen-1] = '\0'; + } else { #ifdef IPV6 - if (addr->family == AF_INET6) { - FIXME; /* I don't know how to get a text form of an IPv6 address. */ - } else -#endif - if (addr->family == AF_INET) { + 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->address); strncpy(buf, inet_ntoa(a), buflen); buf[buflen-1] = '\0'; - } else { - assert(addr->family == AF_UNSPEC); - strncpy(buf, addr->hostname, buflen); - buf[buflen-1] = '\0'; +#endif } } @@ -236,18 +237,25 @@ int sk_hostname_is_local(char *name) int sk_address_is_local(SockAddr addr) { + + if (addr->family == AF_UNSPEC) + return 0; /* we don't know; assume not */ + else { #ifdef IPV6 - if (addr->family == AF_INET6) { - FIXME; /* someone who can compile for IPV6 had better do this bit */ - } else -#endif - if (addr->family == AF_INET) { + 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; +#else struct in_addr a; + assert(addr->family == AF_INET); a.s_addr = htonl(addr->address); return ipv4_is_loopback(a); - } else { - assert(addr->family == AF_UNSPEC); - return 0; /* we don't know; assume not */ +#endif } } @@ -262,21 +270,32 @@ int sk_addrtype(SockAddr addr) void sk_addrcopy(SockAddr addr, char *buf) { - assert(addr->family != AF_UNSPEC); + #ifdef IPV6 - if (addr->family == AF_INET6) { - memcpy(buf, (char*) addr->ai, 16); - } else + 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->address); + memcpy(buf, (char*) &a.s_addr, 4); #endif - if (addr->family == AF_INET) { - struct in_addr a; - a.s_addr = htonl(addr->address); - memcpy(buf, (char*) &a.s_addr, 4); - } } void sk_addr_free(SockAddr addr) { + +#ifdef IPV6 + if (addr->ai != NULL) + freeaddrinfo(addr->ai); +#endif sfree(addr); } @@ -298,34 +317,34 @@ 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); +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(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 - }; - 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); @@ -347,6 +366,7 @@ Socket sk_register(void *sock, Plug plug) ret->oobinline = 0; + uxsel_tell(ret); add234(sktree, ret); return (Socket) ret; @@ -355,18 +375,6 @@ Socket sk_register(void *sock, Plug plug) 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 - }; - int s; #ifdef IPV6 struct sockaddr_in6 a6; @@ -375,12 +383,13 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, int err; Actual_Socket ret; short localport; + int fl; /* * 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); @@ -431,26 +440,20 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, #ifdef IPV6 if (addr->family == AF_INET6) { - memset(&a6, 0, sizeof(a6)); + /* XXX use getaddrinfo to get a local address? */ a6.sin6_family = AF_INET6; -/*a6.sin6_addr = in6addr_any; *//* == 0 */ + a6.sin6_addr = in6addr_any; a6.sin6_port = htons(localport); + retcode = bind(s, (struct sockaddr *) &a6, sizeof(a6)); } 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)); } -#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)); -#endif if (retcode >= 0) { err = 0; break; /* done */ @@ -476,36 +479,33 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, * 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 - { - a.sin_family = AF_INET; - a.sin_addr.s_addr = htonl(addr->address); - a.sin_port = htons((short) port); + /* 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); } +#else + a.sin_family = AF_INET; + a.sin_addr.s_addr = htonl(addr->address); + a.sin_port = htons((short) port); +#endif + + fl = fcntl(s, F_GETFL); + if (fl != -1) + fcntl(s, F_SETFL, fl | O_NONBLOCK); if (( #ifdef IPV6 - connect(s, ((addr->family == AF_INET6) ? - (struct sockaddr *) &a6 : (struct sockaddr *) &a), - (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) + connect(s, addr->ai->ai_addr, addr->ai->ai_addrlen) #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 ) { + if ( errno != EINPROGRESS ) { ret->error = error_string(errno); return (Socket) ret; } @@ -518,6 +518,7 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, ret->writable = 1; } + uxsel_tell(ret); add234(sktree, ret); return (Socket) ret; @@ -525,22 +526,14 @@ Socket sk_new(SockAddr addr, int port, int privport, int oobinline, Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) { - 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 - }; - int s; #ifdef IPV6 +#if 0 struct sockaddr_in6 a6; #endif + struct addrinfo hints, *ai; + char portstr[6]; +#endif struct sockaddr_in a; int err; Actual_Socket ret; @@ -550,8 +543,8 @@ Socket sk_newlistener(char *srcaddr, 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); @@ -580,11 +573,24 @@ Socket sk_newlistener(char *srcaddr, 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; - /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't - * know how to do it. :-) */ + 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 @@ -592,6 +598,7 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) a6.sin6_port = htons(port); } else #endif +#endif { int got_addr = 0; a.sin_family = AF_INET; @@ -620,16 +627,9 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) } a.sin_port = htons((short)port); + retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); } -#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)); -#endif + if (retcode >= 0) { err = 0; } else { @@ -648,6 +648,7 @@ Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) return (Socket) ret; } + uxsel_tell(ret); add234(sktree, ret); return (Socket) ret; @@ -657,11 +658,41 @@ static void sk_tcp_close(Socket sock) { Actual_Socket s = (Actual_Socket) sock; + uxsel_del(s->s); del234(sktree, s); close(s->s); sfree(s); } +int sk_getxdmdata(void *sock, unsigned long *ip, int *port) +{ + Actual_Socket s = (Actual_Socket) sock; + struct sockaddr_in addr; + socklen_t addrlen; + + /* + * 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. + */ + + addrlen = sizeof(addr); + if (getsockname(s->s, (struct sockaddr *)&addr, &addrlen) < 0 || + addr.sin_family != AF_INET) + return 0; + + *ip = ntohl(addr.sin_addr.s_addr); + *port = ntohs(addr.sin_port); + + return 1; +} + /* * The function which tries to send on a socket once it's deemed * writable. @@ -725,9 +756,10 @@ 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; @@ -742,10 +774,16 @@ 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; @@ -763,10 +801,16 @@ 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; @@ -782,11 +826,6 @@ int select_result(int fd, int event) 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) { /* @@ -798,8 +837,8 @@ 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)); + 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); @@ -883,7 +922,15 @@ int select_result(int fd, int event) } 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); @@ -956,11 +1003,11 @@ 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; @@ -977,42 +1024,21 @@ 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; + int rwx = 0; + if (!s->connected) + rwx |= 2; /* write == connect */ if (s->connected && !s->frozen) - val |= 1 | 4; /* read, except */ + rwx |= 1 | 4; /* read, except */ if (bufchain_size(&s->output_data)) - val |= 2; /* write */ + rwx |= 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; + rwx |= 1; /* read == accept */ + uxsel_set(s->s, rwx, net_select_result); } int net_service_lookup(char *service)