implement getsockname, getpeername, and getaddrinfo (#488)

This also includes stubs for `gethostbyname`, `gethostbyaddr`, etc. which were
necessary to get CPython to build.  I believe it will be possible to implement
them all properly at some point, but don't have the bandwidth at the moment.

Finally, this includes a few fixes for issues I missed in earlier PRs that
surfaced when running the CPython `asyncio` test suite.

Signed-off-by: Joel Dice <joel.dice@fermyon.com>
Co-authored-by: Dave Bakker <github@davebakker.io>

Author: dicej

Makefile

@@ -94,7 +94,9 @@ LIBC_BOTTOM_HALF_OMIT_SOURCES := \
 	$(LIBC_BOTTOM_HALF_SOURCES)/accept-wasip2.c \
 	$(LIBC_BOTTOM_HALF_SOURCES)/shutdown.c \
 	$(LIBC_BOTTOM_HALF_SOURCES)/sockopt.c \
-	$(LIBC_BOTTOM_HALF_SOURCES)/poll-wasip2.c
+	$(LIBC_BOTTOM_HALF_SOURCES)/poll-wasip2.c \
+	$(LIBC_BOTTOM_HALF_SOURCES)/getsockpeername.c \
+	$(LIBC_BOTTOM_HALF_SOURCES)/netdb.c
 LIBC_BOTTOM_HALF_ALL_SOURCES := $(filter-out $(LIBC_BOTTOM_HALF_OMIT_SOURCES),$(LIBC_BOTTOM_HALF_ALL_SOURCES))
 # Omit p2-specific headers from include-all.c test.
 # for exception-handling.
@@ -249,6 +251,13 @@ LIBC_TOP_HALF_MUSL_SOURCES = \
                  $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/complex/*.c)) \
     $(wildcard $(LIBC_TOP_HALF_MUSL_SRC_DIR)/crypt/*.c)
 
+ifeq ($(WASI_SNAPSHOT), p2)
+LIBC_TOP_HALF_MUSL_SOURCES += \
+    $(addprefix $(LIBC_TOP_HALF_MUSL_SRC_DIR)/, \
+       network/gai_strerror.c \
+    )
+endif
+
 ifeq ($(THREAD_MODEL), posix)
 LIBC_TOP_HALF_MUSL_SOURCES += \
     $(addprefix $(LIBC_TOP_HALF_MUSL_SRC_DIR)/, \
@@ -387,6 +396,10 @@ ASMFLAGS += -matomics
 CFLAGS += -I$(LIBC_BOTTOM_HALF_CLOUDLIBC_SRC)
 endif
 
+ifeq ($(WASI_SNAPSHOT), p2)
+EXTRA_CFLAGS += -D__wasilibc_use_wasip2
+endif
+
 # Expose the public headers to the implementation. We use `-isystem` for
 # purpose for two reasons:
 #
@@ -500,7 +513,6 @@ MUSL_OMIT_HEADERS += \
     "sys/auxv.h" \
     "pwd.h" "shadow.h" "grp.h" \
     "mntent.h" \
-    "netdb.h" \
     "resolv.h" \
     "pty.h" \
     "ulimit.h" \
@@ -523,6 +535,10 @@ MUSL_OMIT_HEADERS += \
     "sys/sysmacros.h" \
     "aio.h"
 
+ifeq ($(WASI_SNAPSHOT), p1)
+MUSL_OMIT_HEADERS += "netdb.h"
+endif
+
 ifeq ($(THREAD_MODEL), single)
 # Remove headers not supported in single-threaded mode.
 MUSL_OMIT_HEADERS += "pthread.h"

expected/wasm32-wasip2/defined-symbols.txt

@@ -535,6 +535,9 @@ dprintf
 drand48
 drem
 dremf
+drop_tcp_socket
+drop_udp_socket
+drop_udp_socket_streams
 duplocale
 ecvt
 encrypt
@@ -709,6 +712,7 @@ fputws_unlocked
 fread
 fread_unlocked
 free
+freeaddrinfo
 freelocale
 freopen
 freopen64
@@ -737,11 +741,13 @@ fwprintf
 fwrite
 fwrite_unlocked
 fwscanf
+gai_strerror
 gcvt
 get_avphys_pages
 get_nprocs
 get_nprocs_conf
 get_phys_pages
+getaddrinfo
 getc
 getc_unlocked
 getchar
@@ -753,14 +759,22 @@ getdelim
 getdomainname
 getentropy
 getenv
+gethostbyaddr
+gethostbyname
 gethostid
 getline
+getnameinfo
 getopt
 getopt_long
 getopt_long_only
 getpagesize
+getpeername
 getpid
+getprotobyname
 getrusage
+getservbyname
+getservbyport
+getsockname
 getsockopt
 getsubopt
 gettimeofday
@@ -775,12 +789,14 @@ globfree
 globfree64
 gmtime
 gmtime_r
+h_errno
 hcreate
 hcreate_r
 hdestroy
 hdestroy_r
 hsearch
 hsearch_r
+hstrerror
 htonl
 htons
 hypot
@@ -1246,6 +1262,8 @@ tcp_bind
 tcp_borrow_tcp_socket
 tcp_create_socket_create_tcp_socket
 tcp_create_socket_result_own_tcp_socket_error_code_free
+tcp_getpeername
+tcp_getsockname
 tcp_getsockopt
 tcp_ip_socket_address_free
 tcp_listen
@@ -1338,6 +1356,8 @@ udp_borrow_outgoing_datagram_stream
 udp_borrow_udp_socket
 udp_create_socket_create_udp_socket
 udp_create_socket_result_own_udp_socket_error_code_free
+udp_getpeername
+udp_getsockname
 udp_getsockopt
 udp_incoming_datagram_free
 udp_incoming_datagram_stream_drop_borrow

expected/wasm32-wasip2/include-all.c

@@ -102,6 +102,7 @@
 #include <memory.h>
 #include <monetary.h>
 #include <mqueue.h>
+#include <netdb.h>
 #include <netinet/icmp6.h>
 #include <netinet/igmp.h>
 #include <netinet/in.h>

expected/wasm32-wasip2/predefined-macros.txt

@@ -37,6 +37,13 @@
 #define AF_INET6 PF_INET6
 #define AF_UNIX 3
 #define AF_UNSPEC PF_UNSPEC
+#define AI_ADDRCONFIG 0x20
+#define AI_ALL 0x10
+#define AI_CANONNAME 0x02
+#define AI_NUMERICHOST 0x04
+#define AI_NUMERICSERV 0x400
+#define AI_PASSIVE 0x01
+#define AI_V4MAPPED 0x08
 #define ALT_DIGITS 0x2002F
 #define AM_STR 0x20026
 #define ANYMARK 0x01
@@ -192,6 +199,24 @@
 #define EADDRNOTAVAIL __WASI_ERRNO_ADDRNOTAVAIL
 #define EAFNOSUPPORT __WASI_ERRNO_AFNOSUPPORT
 #define EAGAIN __WASI_ERRNO_AGAIN
+#define EAI_ADDRFAMILY -9
+#define EAI_AGAIN -3
+#define EAI_ALLDONE -103
+#define EAI_BADFLAGS -1
+#define EAI_CANCELED -101
+#define EAI_FAIL -4
+#define EAI_FAMILY -6
+#define EAI_IDN_ENCODE -105
+#define EAI_INPROGRESS -100
+#define EAI_INTR -104
+#define EAI_MEMORY -10
+#define EAI_NODATA -5
+#define EAI_NONAME -2
+#define EAI_NOTCANCELED -102
+#define EAI_OVERFLOW -12
+#define EAI_SERVICE -8
+#define EAI_SOCKTYPE -7
+#define EAI_SYSTEM -11
 #define EALREADY __WASI_ERRNO_ALREADY
 #define EBADF __WASI_ERRNO_BADF
 #define EBADID 5
@@ -489,6 +514,7 @@
 #define HIBITL MINLONG
 #define HIBITS MINSHORT
 #define HOST_NAME_MAX 255
+#define HOST_NOT_FOUND 1
 #define HUGE 3.40282346638528859812e+38F
 #define HUGE_VAL ((double)INFINITY)
 #define HUGE_VALF INFINITY
@@ -1239,6 +1265,14 @@
 #define NEW_ENV_VAR 0
 #define NGROUPS 32
 #define NGROUPS_MAX 32
+#define NI_DGRAM 0x10
+#define NI_MAXHOST 255
+#define NI_MAXSERV 32
+#define NI_NAMEREQD 0x08
+#define NI_NOFQDN 0x04
+#define NI_NUMERICHOST 0x01
+#define NI_NUMERICSCOPE 0x100
+#define NI_NUMERICSERV 0x02
 #define NL_ARGMAX 9
 #define NL_CAT_LOCALE 1
 #define NL_LANGMAX 32
@@ -1257,6 +1291,9 @@
 #define NOTAUTH ns_r_notauth
 #define NOTIMP ns_r_notimpl
 #define NOTZONE ns_r_notzone
+#define NO_ADDRESS NO_DATA
+#define NO_DATA 4
+#define NO_RECOVERY 3
 #define NR_ICMP_TYPES 18
 #define NR_ICMP_UNREACH 15
 #define NSLC 18
@@ -1968,6 +2005,7 @@
 #define TOREAD 00004
 #define TOWRITE 00002
 #define TRANSIENT 4
+#define TRY_AGAIN 2
 #define TSGID 02000
 #define TSS_DTOR_ITERATIONS 4
 #define TSUID 04000
@@ -2173,6 +2211,7 @@
 #define _MATH_H 
 #define _MONETARY_H 
 #define _MQUEUE_H 
+#define _NETDB_H 
 #define _NETINET_ICMP6_H 
 #define _NETINET_IGMP_H 
 #define _NETINET_IN_H 
@@ -3194,7 +3233,7 @@
 #define __wasilibc___typedef_suseconds_t_h 
 #define __wasilibc___typedef_time_t_h 
 #define __wasilibc___typedef_uid_t_h 
-#define __wasilibc_use_wasip2 
+#define __wasilibc_use_wasip2 1
 #define __wasm 1
 #define __wasm32 1
 #define __wasm32__ 1
@@ -3281,6 +3320,8 @@
 #define glob64 glob
 #define glob64_t glob_t
 #define globfree64 globfree
+#define h_addr h_addr_list[0]
+#define h_errno h_errno
 #define howmany(n,d) (((n)+((d)-1))/(d))
 #define htobe16(x) __bswap16(x)
 #define htobe32(x) __bswap32(x)