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db_sockets.c
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db_sockets.c
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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/* Copyright (C) 2014 Stony Brook University */
/*
* This file contains operands for streams with URIs that start with "tcp:", "tcp.srv:", "udp:",
* "udp.srv:".
*/
#include <asm-generic/socket.h>
#include <asm/fcntl.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/poll.h>
#include <linux/types.h>
#include "api.h"
#include "pal.h"
#include "pal_error.h"
#include "pal_flags_conv.h"
#include "pal_internal.h"
#include "pal_linux.h"
#include "pal_linux_error.h"
#ifndef SOL_TCP
#define SOL_TCP 6
#endif
#ifndef TCP_NODELAY
#define TCP_NODELAY 1
#endif
#ifndef TCP_CORK
#define TCP_CORK 3
#endif
/* 96 bytes is the minimal size of buffer to store a IPv4/IPv6
address */
#define PAL_SOCKADDR_SIZE 96
static size_t addr_size(const struct sockaddr* addr) {
switch (addr->sa_family) {
case AF_INET:
return sizeof(struct sockaddr_in);
case AF_INET6:
return sizeof(struct sockaddr_in6);
default:
return 0;
}
}
/* parsing the string of uri, and fill in the socket address structure.
the latest pointer of uri, length of socket address are returned. */
static int inet_parse_uri(char** uri, struct sockaddr* addr, size_t* addrlen) {
char* tmp = *uri;
char* end;
char* addr_str = NULL;
char* port_str;
int af;
void* addr_buf;
int addr_len;
__be16* port_buf;
size_t slen;
assert(addrlen);
if (tmp[0] == '[') {
/* for IPv6, the address will be in the form of
"[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx]:port". */
struct sockaddr_in6* addr_in6 = (struct sockaddr_in6*)addr;
slen = sizeof(*addr_in6);
if (*addrlen < slen)
goto inval;
memset(addr, 0, slen);
end = strchr(tmp + 1, ']');
if (!end || *(end + 1) != ':')
goto inval;
addr_str = tmp + 1;
addr_len = end - tmp - 1;
port_str = end + 2;
for (end = port_str; *end >= '0' && *end <= '9'; end++)
;
addr_in6->sin6_family = af = AF_INET6;
addr_buf = &addr_in6->sin6_addr.s6_addr;
port_buf = &addr_in6->sin6_port;
} else {
/* for IP, the address will be in the form of "x.x.x.x:port". */
struct sockaddr_in* addr_in = (struct sockaddr_in*)addr;
slen = sizeof(*addr_in);
if (*addrlen < slen)
goto inval;
memset(addr, 0, slen);
end = strchr(tmp, ':');
if (!end)
goto inval;
addr_str = tmp;
addr_len = end - tmp;
port_str = end + 1;
for (end = port_str; *end >= '0' && *end <= '9'; end++)
;
addr_in->sin_family = af = AF_INET;
addr_buf = &addr_in->sin_addr.s_addr;
port_buf = &addr_in->sin_port;
}
if (af == AF_INET) {
if (!inet_pton4(addr_str, addr_len, addr_buf))
goto inval;
} else {
if (!inet_pton6(addr_str, addr_len, addr_buf))
goto inval;
}
*port_buf = __htons(atoi(port_str));
*uri = *end ? end + 1 : NULL;
*addrlen = slen;
return 0;
inval:
return -PAL_ERROR_INVAL;
}
/* create the string of uri from the given socket address */
static int inet_create_uri(char* buf, size_t buf_size, struct sockaddr* addr, size_t addrlen,
size_t* output_len) {
int len = 0; /* snprintf returns `int` */
if (addr->sa_family == AF_INET) {
if (addrlen < sizeof(struct sockaddr_in))
return -PAL_ERROR_INVAL;
struct sockaddr_in* addr_in = (struct sockaddr_in*)addr;
char* addr = (char*)&addr_in->sin_addr.s_addr;
/* for IP, the address will be in the form of "x.x.x.x:port". */
len = snprintf(buf, buf_size, "%u.%u.%u.%u:%u", (unsigned char)addr[0],
(unsigned char)addr[1], (unsigned char)addr[2], (unsigned char)addr[3],
__ntohs(addr_in->sin_port));
} else if (addr->sa_family == AF_INET6) {
if (addrlen < sizeof(struct sockaddr_in6))
return -PAL_ERROR_INVAL;
struct sockaddr_in6* addr_in6 = (struct sockaddr_in6*)addr;
unsigned short* addr = (unsigned short*)&addr_in6->sin6_addr.s6_addr;
/* for IPv6, the address will be in the form of
"[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx]:port". */
len = snprintf(buf, buf_size, "[%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]:%u",
__ntohs(addr[0]), __ntohs(addr[1]), __ntohs(addr[2]), __ntohs(addr[3]),
__ntohs(addr[4]), __ntohs(addr[5]), __ntohs(addr[6]), __ntohs(addr[7]),
__ntohs(addr_in6->sin6_port));
} else {
return -PAL_ERROR_INVAL;
}
if (len < 0)
return len;
if ((size_t)len >= buf_size)
return -PAL_ERROR_TOOLONG;
if (output_len)
*output_len = (size_t)len;
return 0;
}
/*
* Parse a URI for a socket stream. The URI might have both binding address and connecting
* address, or connecting address only. The form of URI will be either
* "bind-addr:bind-port:connect-addr:connect-port" or "addr:port".
*/
static int socket_parse_uri(char* uri, struct sockaddr** bind_addr, size_t* bind_addrlen,
struct sockaddr** dest_addr, size_t* dest_addrlen) {
int ret;
if (!bind_addr && !dest_addr)
return 0;
if (!uri || !(*uri)) {
if (bind_addr)
*bind_addr = NULL;
if (bind_addrlen)
*bind_addrlen = 0;
if (dest_addr)
*dest_addr = NULL;
if (dest_addrlen)
*dest_addrlen = 0;
return 0;
}
/* at least parse uri once */
if ((ret = inet_parse_uri(&uri, bind_addr ? *bind_addr : *dest_addr,
bind_addr ? bind_addrlen : dest_addrlen)) < 0)
return ret;
if (!(bind_addr && dest_addr))
return 0;
/* if you reach here, it can only be connection address */
if (!uri || (ret = inet_parse_uri(&uri, *dest_addr, dest_addrlen)) < 0) {
*dest_addr = *bind_addr;
*dest_addrlen = *bind_addrlen;
*bind_addr = NULL;
*bind_addrlen = 0;
}
return 0;
}
/* fill in the PAL handle based on the file descriptors and address given. */
static inline PAL_HANDLE socket_create_handle(int type, int fd, pal_stream_options_t options,
struct sockaddr* bind_addr, size_t bind_addrlen,
struct sockaddr* dest_addr, size_t dest_addrlen,
struct sockopt* sock_options) {
PAL_HANDLE hdl = calloc(1, HANDLE_SIZE(sock) + (bind_addr ? bind_addrlen : 0)
+ (dest_addr ? dest_addrlen : 0));
if (!hdl)
return NULL;
init_handle_hdr(hdl, type);
hdl->flags |= PAL_HANDLE_FD_READABLE;
if (type != PAL_TYPE_TCPSRV) {
hdl->flags |= PAL_HANDLE_FD_WRITABLE;
}
hdl->sock.fd = fd;
uint8_t* addr = (uint8_t*)hdl + HANDLE_SIZE(sock);
if (bind_addr) {
hdl->sock.bind = (struct sockaddr*)addr;
memcpy(addr, bind_addr, bind_addrlen);
addr += bind_addrlen;
} else {
hdl->sock.bind = NULL;
}
if (dest_addr) {
hdl->sock.conn = (struct sockaddr*)addr;
memcpy(addr, dest_addr, dest_addrlen);
addr += dest_addrlen;
} else {
hdl->sock.conn = NULL;
}
hdl->sock.nonblocking = !!(options & PAL_OPTION_NONBLOCK);
hdl->sock.linger = sock_options->linger;
hdl->sock.receivebuf = sock_options->receivebuf;
hdl->sock.sendbuf = sock_options->sendbuf;
hdl->sock.receivetimeout_us = sock_options->receivetimeout_us;
hdl->sock.sendtimeout_us = sock_options->sendtimeout_us;
hdl->sock.tcp_cork = sock_options->tcp_cork;
hdl->sock.tcp_keepalive = sock_options->tcp_keepalive;
hdl->sock.tcp_nodelay = sock_options->tcp_nodelay;
return hdl;
}
static inline int sock_type(int type, pal_stream_options_t options) {
if (options & PAL_OPTION_NONBLOCK)
type |= SOCK_NONBLOCK;
return type;
}
/* listen on a tcp socket */
static int tcp_listen(PAL_HANDLE* handle, char* uri, pal_stream_options_t options) {
struct sockaddr_storage buffer;
struct sockaddr* bind_addr = (struct sockaddr*)&buffer;
size_t bind_addrlen = sizeof(buffer);
int ret;
if ((ret = socket_parse_uri(uri, &bind_addr, &bind_addrlen, NULL, NULL)) < 0)
return ret;
if (!bind_addr)
return -PAL_ERROR_INVAL;
int ipv6_v6only = options & PAL_OPTION_DUALSTACK ? 0 : 1;
ret = ocall_listen(bind_addr->sa_family, sock_type(SOCK_STREAM, options), 0, ipv6_v6only,
bind_addr, &bind_addrlen);
if (ret < 0)
return unix_to_pal_error(ret);
struct sockopt sock_options = {
.reuseaddr = 1, /* sockets are always set as reusable in Gramine */
};
*handle = socket_create_handle(PAL_TYPE_TCPSRV, ret, options, bind_addr, bind_addrlen, NULL, 0,
&sock_options);
if (!(*handle)) {
ocall_close(ret);
return -PAL_ERROR_NOMEM;
}
return 0;
}
/* accept a tcp connection */
static int tcp_accept(PAL_HANDLE handle, PAL_HANDLE* client, pal_stream_options_t options) {
if (HANDLE_HDR(handle)->type != PAL_TYPE_TCPSRV || !handle->sock.bind || handle->sock.conn)
return -PAL_ERROR_NOTSERVER;
if (handle->sock.fd == PAL_IDX_POISON)
return -PAL_ERROR_BADHANDLE;
struct sockaddr* bind_addr = handle->sock.bind;
size_t bind_addrlen = addr_size(bind_addr);
struct sockaddr_storage dest_addr;
size_t dest_addrlen = sizeof(dest_addr);
int ret = 0;
static_assert(O_CLOEXEC == SOCK_CLOEXEC && O_NONBLOCK == SOCK_NONBLOCK, "assumed below");
int flags = PAL_OPTION_TO_LINUX_OPEN(options);
ret = ocall_accept(handle->sock.fd, (struct sockaddr*)&dest_addr, &dest_addrlen, flags);
if (ret < 0)
return unix_to_pal_error(ret);
struct sockopt sock_options = {
.reuseaddr = 1, /* sockets are always set as reusable in Gramine */
};
*client = socket_create_handle(PAL_TYPE_TCP, ret, options, bind_addr, bind_addrlen,
(struct sockaddr*)&dest_addr, dest_addrlen, &sock_options);
if (!(*client)) {
ocall_close(ret);
return -PAL_ERROR_NOMEM;
}
return 0;
}
/* connect on a tcp socket */
static int tcp_connect(PAL_HANDLE* handle, char* uri, pal_stream_options_t options) {
struct sockaddr_storage buffer[2];
struct sockaddr* bind_addr = (struct sockaddr*)&buffer[0];
size_t bind_addrlen = sizeof(buffer[0]);
struct sockaddr* dest_addr = (struct sockaddr*)&buffer[1];
size_t dest_addrlen = sizeof(buffer[1]);
int ret;
/* accepting two kind of different uri:
dest-ip:dest-port or bind-ip:bind-port:dest-ip:dest-port */
if ((ret = socket_parse_uri(uri, &bind_addr, &bind_addrlen, &dest_addr, &dest_addrlen)) < 0)
return ret;
if (!dest_addr)
return -PAL_ERROR_INVAL;
if (bind_addr && bind_addr->sa_family != dest_addr->sa_family)
return -PAL_ERROR_INVAL;
ret = ocall_connect(dest_addr->sa_family, sock_type(SOCK_STREAM, options), 0, /*ipv6_v6only=*/0,
dest_addr, dest_addrlen, bind_addr, &bind_addrlen);
if (ret < 0)
return unix_to_pal_error(ret);
struct sockopt sock_options = {
.reuseaddr = 1, /* sockets are always set as reusable in Gramine */
};
*handle = socket_create_handle(PAL_TYPE_TCP, ret, options, bind_addr, bind_addrlen, dest_addr,
dest_addrlen, &sock_options);
if (!(*handle)) {
ocall_close(ret);
return -PAL_ERROR_NOMEM;
}
return 0;
}
/* 'open' operation of tcp stream */
static int tcp_open(PAL_HANDLE* handle, const char* type, const char* uri, enum pal_access access,
pal_share_flags_t share, enum pal_create_mode create,
pal_stream_options_t options) {
__UNUSED(access);
__UNUSED(share);
__UNUSED(create);
assert(create == PAL_CREATE_IGNORED);
assert(WITHIN_MASK(share, PAL_SHARE_MASK));
assert(WITHIN_MASK(options, PAL_OPTION_MASK));
size_t uri_size = strlen(uri) + 1;
if (uri_size > PAL_SOCKADDR_SIZE)
return -PAL_ERROR_TOOLONG;
char uri_buf[PAL_SOCKADDR_SIZE];
memcpy(uri_buf, uri, uri_size);
if (!strcmp(type, URI_TYPE_TCP_SRV))
return tcp_listen(handle, uri_buf, options);
if (!strcmp(type, URI_TYPE_TCP))
return tcp_connect(handle, uri_buf, options);
return -PAL_ERROR_NOTSUPPORT;
}
/* 'read' operation of tcp stream */
static int64_t tcp_read(PAL_HANDLE handle, uint64_t offset, uint64_t len, void* buf) {
if (offset)
return -PAL_ERROR_INVAL;
if (HANDLE_HDR(handle)->type != PAL_TYPE_TCP || !handle->sock.conn)
return -PAL_ERROR_NOTCONNECTION;
if (handle->sock.fd == PAL_IDX_POISON)
return 0;
ssize_t bytes = ocall_recv(handle->sock.fd, buf, len, NULL, NULL, NULL, NULL);
if (bytes < 0)
return unix_to_pal_error(bytes);
return bytes;
}
/* write' operation of tcp stream */
static int64_t tcp_write(PAL_HANDLE handle, uint64_t offset, uint64_t len, const void* buf) {
if (offset)
return -PAL_ERROR_INVAL;
if (HANDLE_HDR(handle)->type != PAL_TYPE_TCP || !handle->sock.conn)
return -PAL_ERROR_NOTCONNECTION;
if (handle->sock.fd == PAL_IDX_POISON)
return -PAL_ERROR_CONNFAILED;
ssize_t bytes = ocall_send(handle->sock.fd, buf, len, NULL, 0, NULL, 0);
if (bytes < 0)
return unix_to_pal_error(bytes);
return bytes;
}
/* used by 'open' operation of tcp stream for bound socket */
static int udp_bind(PAL_HANDLE* handle, char* uri, pal_stream_options_t options) {
struct sockaddr_storage buffer;
struct sockaddr* bind_addr = (struct sockaddr*)&buffer;
size_t bind_addrlen = sizeof(buffer);
int ret = 0;
if ((ret = socket_parse_uri(uri, &bind_addr, &bind_addrlen, NULL, NULL)) < 0)
return ret;
if (!bind_addr)
return -PAL_ERROR_INVAL;
assert(bind_addrlen == addr_size(bind_addr));
int ipv6_v6only = options & PAL_OPTION_DUALSTACK ? 0 : 1;
ret = ocall_listen(bind_addr->sa_family, sock_type(SOCK_DGRAM, options), 0, ipv6_v6only,
bind_addr, &bind_addrlen);
if (ret < 0)
return unix_to_pal_error(ret);
struct sockopt sock_options = {
.reuseaddr = 1, /* sockets are always set as reusable in Gramine */
};
*handle = socket_create_handle(PAL_TYPE_UDPSRV, ret, options, bind_addr, bind_addrlen, NULL, 0,
&sock_options);
if (!(*handle)) {
ocall_close(ret);
return -PAL_ERROR_NOMEM;
}
return 0;
}
/* used by 'open' operation of tcp stream for connected socket */
static int udp_connect(PAL_HANDLE* handle, char* uri, pal_stream_options_t options) {
struct sockaddr_storage buffer[2];
struct sockaddr* bind_addr = (struct sockaddr*)&buffer[0];
size_t bind_addrlen = sizeof(buffer[0]);
struct sockaddr* dest_addr = (struct sockaddr*)&buffer[1];
size_t dest_addrlen = sizeof(buffer[1]);
int ret;
if ((ret = socket_parse_uri(uri, &bind_addr, &bind_addrlen, &dest_addr, &dest_addrlen)) < 0)
return ret;
int ipv6_v6only = options & PAL_OPTION_DUALSTACK ? 0 : 1;
ret = ocall_connect(dest_addr ? dest_addr->sa_family : AF_INET, sock_type(SOCK_DGRAM, options),
0, ipv6_v6only, dest_addr, dest_addrlen, bind_addr, &bind_addrlen);
if (ret < 0)
return unix_to_pal_error(ret);
struct sockopt sock_options = {
.reuseaddr = 1, /* sockets are always set as reusable in Gramine */
};
*handle = socket_create_handle(dest_addr ? PAL_TYPE_UDP : PAL_TYPE_UDPSRV, ret, options,
bind_addr, bind_addrlen, dest_addr, dest_addrlen, &sock_options);
if (!(*handle)) {
ocall_close(ret);
return -PAL_ERROR_NOMEM;
}
return 0;
}
static int udp_open(PAL_HANDLE* hdl, const char* type, const char* uri, enum pal_access access,
pal_share_flags_t share, enum pal_create_mode create,
pal_stream_options_t options) {
__UNUSED(access);
__UNUSED(share);
__UNUSED(create);
assert(create == PAL_CREATE_IGNORED);
assert(WITHIN_MASK(share, PAL_SHARE_MASK));
assert(WITHIN_MASK(options, PAL_OPTION_MASK));
char buf[PAL_SOCKADDR_SIZE];
size_t len = strlen(uri);
if (len >= PAL_SOCKADDR_SIZE)
return -PAL_ERROR_TOOLONG;
memcpy(buf, uri, len + 1);
if (!strcmp(type, URI_TYPE_UDP_SRV))
return udp_bind(hdl, buf, options);
if (!strcmp(type, URI_TYPE_UDP))
return udp_connect(hdl, buf, options);
return -PAL_ERROR_NOTSUPPORT;
}
static int64_t udp_receive(PAL_HANDLE handle, uint64_t offset, uint64_t len, void* buf) {
if (offset)
return -PAL_ERROR_INVAL;
if (HANDLE_HDR(handle)->type != PAL_TYPE_UDP)
return -PAL_ERROR_NOTCONNECTION;
if (handle->sock.fd == PAL_IDX_POISON)
return -PAL_ERROR_BADHANDLE;
ssize_t ret = ocall_recv(handle->sock.fd, buf, len, NULL, NULL, NULL, NULL);
return ret < 0 ? unix_to_pal_error(ret) : ret;
}
static int64_t udp_receivebyaddr(PAL_HANDLE handle, uint64_t offset, uint64_t len, void* buf,
char* addr, size_t addrlen) {
if (offset)
return -PAL_ERROR_INVAL;
if (HANDLE_HDR(handle)->type != PAL_TYPE_UDPSRV)
return -PAL_ERROR_NOTCONNECTION;
if (handle->sock.fd == PAL_IDX_POISON)
return -PAL_ERROR_BADHANDLE;
struct sockaddr_storage conn_addr;
size_t conn_addrlen = sizeof(conn_addr);
ssize_t bytes = ocall_recv(handle->sock.fd, buf, len, (struct sockaddr*)&conn_addr,
&conn_addrlen, NULL, NULL);
if (bytes < 0)
return unix_to_pal_error(bytes);
char* addr_uri = strcpy_static(addr, URI_PREFIX_UDP, addrlen);
if (!addr_uri)
return -PAL_ERROR_OVERFLOW;
int ret = inet_create_uri(addr_uri, addr + addrlen - addr_uri, (struct sockaddr*)&conn_addr,
conn_addrlen, NULL);
if (ret < 0)
return ret;
return bytes;
}
static int64_t udp_send(PAL_HANDLE handle, uint64_t offset, uint64_t len, const void* buf) {
if (offset)
return -PAL_ERROR_INVAL;
if (HANDLE_HDR(handle)->type != PAL_TYPE_UDP)
return -PAL_ERROR_NOTCONNECTION;
if (handle->sock.fd == PAL_IDX_POISON)
return -PAL_ERROR_BADHANDLE;
ssize_t bytes = ocall_send(handle->sock.fd, buf, len, NULL, 0, NULL, 0);
if (bytes < 0)
return unix_to_pal_error(bytes);
return bytes;
}
static int64_t udp_sendbyaddr(PAL_HANDLE handle, uint64_t offset, uint64_t len, const void* buf,
const char* addr, size_t addrlen) {
if (offset)
return -PAL_ERROR_INVAL;
if (HANDLE_HDR(handle)->type != PAL_TYPE_UDPSRV)
return -PAL_ERROR_NOTCONNECTION;
if (handle->sock.fd == PAL_IDX_POISON)
return -PAL_ERROR_BADHANDLE;
if (!strstartswith(addr, URI_PREFIX_UDP))
return -PAL_ERROR_INVAL;
addr += static_strlen(URI_PREFIX_UDP);
addrlen -= static_strlen(URI_PREFIX_UDP);
char* addrbuf = __alloca(addrlen + 1);
memcpy(addrbuf, addr, addrlen);
addrbuf[addrlen] = '\0';
struct sockaddr_storage conn_addr;
size_t conn_addrlen = sizeof(conn_addr);
int ret = inet_parse_uri(&addrbuf, (struct sockaddr*)&conn_addr, &conn_addrlen);
if (ret < 0)
return ret;
ssize_t bytes = ocall_send(handle->sock.fd, buf, len, (struct sockaddr*)&conn_addr,
conn_addrlen, NULL, 0);
if (bytes < 0)
return unix_to_pal_error(bytes);
return bytes;
}
static int socket_delete(PAL_HANDLE handle, enum pal_delete_mode delete_mode) {
if (handle->sock.fd == PAL_IDX_POISON)
return 0;
if (HANDLE_HDR(handle)->type != PAL_TYPE_TCP && delete_mode != PAL_DELETE_ALL)
return -PAL_ERROR_INVAL;
if (HANDLE_HDR(handle)->type == PAL_TYPE_TCP || HANDLE_HDR(handle)->type == PAL_TYPE_TCPSRV) {
int shutdown;
switch (delete_mode) {
case PAL_DELETE_ALL:
shutdown = SHUT_RDWR;
break;
case PAL_DELETE_READ:
shutdown = SHUT_RD;
break;
case PAL_DELETE_WRITE:
shutdown = SHUT_WR;
break;
default:
return -PAL_ERROR_INVAL;
}
ocall_shutdown(handle->sock.fd, shutdown);
}
return 0;
}
static int socket_close(PAL_HANDLE handle) {
if (handle->sock.fd != PAL_IDX_POISON) {
ocall_close(handle->sock.fd);
handle->sock.fd = PAL_IDX_POISON;
}
if (handle->sock.bind)
handle->sock.bind = NULL;
if (handle->sock.conn)
handle->sock.conn = NULL;
return 0;
}
static int socket_attrquerybyhdl(PAL_HANDLE handle, PAL_STREAM_ATTR* attr) {
int ret;
if (handle->sock.fd == PAL_IDX_POISON)
return -PAL_ERROR_BADHANDLE;
attr->handle_type = HANDLE_HDR(handle)->type;
attr->nonblocking = handle->sock.nonblocking;
attr->disconnected = handle->flags & PAL_HANDLE_FD_ERROR;
attr->socket.linger = handle->sock.linger;
attr->socket.receivebuf = handle->sock.receivebuf;
attr->socket.sendbuf = handle->sock.sendbuf;
attr->socket.receivetimeout_us = handle->sock.receivetimeout_us;
attr->socket.sendtimeout_us = handle->sock.sendtimeout_us;
attr->socket.tcp_cork = handle->sock.tcp_cork;
attr->socket.tcp_keepalive = handle->sock.tcp_keepalive;
attr->socket.tcp_nodelay = handle->sock.tcp_nodelay;
/* get number of bytes available for reading (doesn't make sense for listening sockets) */
attr->pending_size = 0;
if (HANDLE_HDR(handle)->type != PAL_TYPE_TCPSRV) {
ret = ocall_fionread(handle->sock.fd);
if (ret < 0)
return unix_to_pal_error(ret);
attr->pending_size = ret;
}
return 0;
}
static int socket_attrsetbyhdl(PAL_HANDLE handle, PAL_STREAM_ATTR* attr) {
if (handle->sock.fd == PAL_IDX_POISON)
return -PAL_ERROR_BADHANDLE;
int fd = handle->sock.fd, ret, val;
if (attr->nonblocking != handle->sock.nonblocking) {
ret = ocall_fsetnonblock(fd, attr->nonblocking);
if (ret < 0)
return unix_to_pal_error(ret);
handle->sock.nonblocking = attr->nonblocking;
}
struct __kernel_linger {
int l_onoff;
int l_linger;
};
if (attr->socket.linger != handle->sock.linger) {
struct __kernel_linger l;
l.l_onoff = attr->socket.linger ? 1 : 0;
l.l_linger = attr->socket.linger;
ret = ocall_setsockopt(fd, SOL_SOCKET, SO_LINGER, &l, sizeof(struct __kernel_linger));
if (ret < 0)
return unix_to_pal_error(ret);
handle->sock.linger = attr->socket.linger;
}
if (attr->socket.receivebuf != handle->sock.receivebuf) {
val = attr->socket.receivebuf;
ret = ocall_setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &val, sizeof(int));
if (ret < 0)
return unix_to_pal_error(ret);
handle->sock.receivebuf = attr->socket.receivebuf;
}
if (attr->socket.sendbuf != handle->sock.sendbuf) {
val = attr->socket.sendbuf;
ret = ocall_setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &val, sizeof(int));
if (ret < 0)
return unix_to_pal_error(ret);
handle->sock.sendbuf = attr->socket.sendbuf;
}
if (attr->socket.receivetimeout_us != handle->sock.receivetimeout_us) {
struct timeval tv;
tv.tv_sec = attr->socket.receivetimeout_us / TIME_US_IN_S;
tv.tv_usec = attr->socket.receivetimeout_us % TIME_US_IN_S;
ret = ocall_setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv));
if (ret < 0)
return unix_to_pal_error(ret);
handle->sock.receivetimeout_us = attr->socket.receivetimeout_us;
}
if (attr->socket.sendtimeout_us != handle->sock.sendtimeout_us) {
struct timeval tv;
tv.tv_sec = attr->socket.sendtimeout_us / TIME_US_IN_S;
tv.tv_usec = attr->socket.sendtimeout_us % TIME_US_IN_S;
ret = ocall_setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv));
if (ret < 0)
return unix_to_pal_error(ret);
handle->sock.sendtimeout_us = attr->socket.sendtimeout_us;
}
if (HANDLE_TYPE(handle) == PAL_TYPE_TCP || HANDLE_TYPE(handle) == PAL_TYPE_TCPSRV) {
if (attr->socket.tcp_cork != handle->sock.tcp_cork) {
val = attr->socket.tcp_cork ? 1 : 0;
ret = ocall_setsockopt(fd, SOL_TCP, TCP_CORK, &val, sizeof(int));
if (ret < 0)
return unix_to_pal_error(ret);
handle->sock.tcp_cork = attr->socket.tcp_cork;
}
if (attr->socket.tcp_keepalive != handle->sock.tcp_keepalive) {
val = attr->socket.tcp_keepalive ? 1 : 0;
ret = ocall_setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(int));
if (ret < 0)
return unix_to_pal_error(ret);
handle->sock.tcp_keepalive = attr->socket.tcp_keepalive;
}
if (attr->socket.tcp_nodelay != handle->sock.tcp_nodelay) {
val = attr->socket.tcp_nodelay ? 1 : 0;
ret = ocall_setsockopt(fd, SOL_TCP, TCP_NODELAY, &val, sizeof(int));
if (ret < 0)
return unix_to_pal_error(ret);
handle->sock.tcp_nodelay = attr->socket.tcp_nodelay;
}
}
return 0;
}
static int socket_getname(PAL_HANDLE handle, char* buffer, size_t count) {
size_t orig_count = count;
int ret;
const char* prefix = NULL;
size_t prefix_len = 0;
struct sockaddr* bind_addr = NULL;
struct sockaddr* dest_addr = NULL;
switch (PAL_GET_TYPE(handle)) {
case PAL_TYPE_TCPSRV:
prefix_len = static_strlen(URI_PREFIX_TCP_SRV);
prefix = URI_PREFIX_TCP_SRV;
bind_addr = handle->sock.bind;
break;
case PAL_TYPE_TCP:
prefix_len = static_strlen(URI_PREFIX_TCP);
prefix = URI_PREFIX_TCP;
bind_addr = handle->sock.bind;
dest_addr = handle->sock.conn;
break;
case PAL_TYPE_UDPSRV:
prefix_len = static_strlen(URI_PREFIX_UDP_SRV);
prefix = URI_PREFIX_UDP_SRV;
bind_addr = handle->sock.bind;
break;
case PAL_TYPE_UDP:
prefix_len = static_strlen(URI_PREFIX_UDP);
prefix = URI_PREFIX_UDP;
bind_addr = handle->sock.bind;
dest_addr = handle->sock.conn;
break;
default:
return -PAL_ERROR_INVAL;
}
if (count < prefix_len + 1) {
return -PAL_ERROR_OVERFLOW;
}
memcpy(buffer, prefix, prefix_len + 1);
buffer += prefix_len;
count -= prefix_len;
if (bind_addr) {
size_t uri_size;
ret = inet_create_uri(buffer, count, bind_addr, addr_size(bind_addr), &uri_size);
if (ret < 0) {
return ret;
}
buffer += uri_size;
count -= uri_size;
}
if (dest_addr) {
if (bind_addr) {
if (count < 2) {
return -PAL_ERROR_OVERFLOW;
}
*buffer++ = ':';
*buffer = '\0';
count--;
}
size_t uri_size;
ret = inet_create_uri(buffer, count, dest_addr, addr_size(dest_addr), &uri_size);
if (ret < 0) {
return ret;
}
buffer += uri_size;
count -= uri_size;
}
return orig_count - count;
}
struct handle_ops g_tcp_ops = {
.getname = &socket_getname,
.open = &tcp_open,
.waitforclient = &tcp_accept,
.read = &tcp_read,
.write = &tcp_write,
.delete = &socket_delete,
.close = &socket_close,
.attrquerybyhdl = &socket_attrquerybyhdl,
.attrsetbyhdl = &socket_attrsetbyhdl,
};
struct handle_ops g_udp_ops = {
.getname = &socket_getname,
.open = &udp_open,
.read = &udp_receive,
.write = &udp_send,
.delete = &socket_delete,
.close = &socket_close,
.attrquerybyhdl = &socket_attrquerybyhdl,
.attrsetbyhdl = &socket_attrsetbyhdl,
};
struct handle_ops g_udpsrv_ops = {
.getname = &socket_getname,
.open = &udp_open,
.readbyaddr = &udp_receivebyaddr,
.writebyaddr = &udp_sendbyaddr,
.delete = &socket_delete,
.close = &socket_close,
.attrquerybyhdl = &socket_attrquerybyhdl,
.attrsetbyhdl = &socket_attrsetbyhdl,
};