Vendor import of lldb trunk r256945:vendor/lldb/lldb-trunk-r256945

https://llvm.org/svn/llvm-project/lldb/trunk@256945

1 files changed, 421 insertions, 0 deletions

diff --git a/tools/debugserver/source/RNBSocket.cpp b/tools/debugserver/source/RNBSocket.cpp
new file mode 100644
index 000000000000..ce4886ab9df3
--- /dev/null
+++ b/tools/debugserver/source/RNBSocket.cpp
@@ -0,0 +1,421 @@
+//===-- RNBSocket.cpp -------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  Created by Greg Clayton on 12/12/07.
+//
+//===----------------------------------------------------------------------===//
+
+#include "RNBSocket.h"
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <termios.h>
+#include "DNBLog.h"
+#include "DNBError.h"
+
+#ifdef WITH_LOCKDOWN
+#include "lockdown.h"
+#endif
+
+/* Once we have a RNBSocket object with a port # specified,
+   this function is called to wait for an incoming connection.
+   This function blocks while waiting for that connection.  */
+
+bool
+ResolveIPV4HostName (const char *hostname, in_addr_t &addr)
+{
+    if (hostname == NULL ||
+        hostname[0] == '\0' ||
+        strcmp(hostname, "localhost") == 0 ||
+        strcmp(hostname, "127.0.0.1") == 0)
+    {
+        addr = htonl (INADDR_LOOPBACK);
+        return true;
+    }
+    else if (strcmp(hostname, "*") == 0)
+    {
+        addr = htonl (INADDR_ANY);
+        return true;
+    }
+    else
+    {
+        // See if an IP address was specified as numbers
+        int inet_pton_result = ::inet_pton (AF_INET, hostname, &addr);
+
+        if (inet_pton_result == 1)
+            return true;
+        
+        struct hostent *host_entry = gethostbyname (hostname);
+        if (host_entry)
+        {
+            std::string ip_str (::inet_ntoa (*(struct in_addr *)*host_entry->h_addr_list));
+            inet_pton_result = ::inet_pton (AF_INET, ip_str.c_str(), &addr);
+            if (inet_pton_result == 1)
+                return true;
+        }
+    }
+    return false;
+}
+
+rnb_err_t
+RNBSocket::Listen (const char *listen_host, uint16_t port, PortBoundCallback callback, const void *callback_baton)
+{
+    //DNBLogThreadedIf(LOG_RNB_COMM, "%8u RNBSocket::%s called", (uint32_t)m_timer.ElapsedMicroSeconds(true), __FUNCTION__);
+    // Disconnect without saving errno
+    Disconnect (false);
+
+    // Now figure out the hostname that will be attaching and palce it into
+    struct sockaddr_in listen_addr;
+    ::memset (&listen_addr, 0, sizeof listen_addr);
+    listen_addr.sin_len = sizeof listen_addr;
+    listen_addr.sin_family = AF_INET;
+    listen_addr.sin_port = htons (port);
+    listen_addr.sin_addr.s_addr = INADDR_ANY;
+    
+    if (!ResolveIPV4HostName(listen_host, listen_addr.sin_addr.s_addr))
+    {
+        DNBLogThreaded("error: failed to resolve connecting host '%s'", listen_host);
+        return rnb_err;
+    }
+    
+    DNBError err;
+    int listen_fd = ::socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
+    if (listen_fd == -1)
+        err.SetError(errno, DNBError::POSIX);
+
+    if (err.Fail() || DNBLogCheckLogBit(LOG_RNB_COMM))
+        err.LogThreaded("::socket ( domain = AF_INET, type = SOCK_STREAM, protocol = IPPROTO_TCP ) => socket = %i", listen_fd);
+
+    if (err.Fail())
+        return rnb_err;
+
+    // enable local address reuse
+    SetSocketOption (listen_fd, SOL_SOCKET, SO_REUSEADDR, 1);
+
+    struct sockaddr_in sa;
+    ::memset (&sa, 0, sizeof sa);
+    sa.sin_len = sizeof sa;
+    sa.sin_family = AF_INET;
+    sa.sin_port = htons (port);
+    sa.sin_addr.s_addr = INADDR_ANY; // Let incoming connections bind to any host network interface (this is NOT who can connect to us)
+    int error = ::bind (listen_fd, (struct sockaddr *) &sa, sizeof(sa));
+    if (error == -1)
+        err.SetError(errno, DNBError::POSIX);
+
+    if (err.Fail() || DNBLogCheckLogBit(LOG_RNB_COMM))
+        err.LogThreaded("::bind ( socket = %i, (struct sockaddr *) &sa, sizeof(sa)) )", listen_fd);
+
+    if (err.Fail())
+    {
+        ClosePort (listen_fd, false);
+        return rnb_err;
+    }
+
+    error = ::listen (listen_fd, 5);
+    if (error == -1)
+        err.SetError(errno, DNBError::POSIX);
+
+    if (err.Fail() || DNBLogCheckLogBit(LOG_RNB_COMM))
+        err.LogThreaded("::listen ( socket = %i, backlog = 1 )", listen_fd);
+
+    if (err.Fail())
+    {
+        ClosePort (listen_fd, false);
+        return rnb_err;
+    }
+    
+    if (callback)
+    {
+        // We were asked to listen on port zero which means we
+        // must now read the actual port that was given to us
+        // as port zero is a special code for "find an open port
+        // for me".
+        if (port == 0)
+        {
+            socklen_t sa_len = sizeof (sa);
+            if (getsockname(listen_fd, (struct sockaddr *)&sa, &sa_len) == 0)
+            {
+                port = ntohs (sa.sin_port);
+                callback (callback_baton, port);
+            }
+        }
+        else
+        {
+            callback (callback_baton, port);
+        }
+    }
+
+    struct sockaddr_in accept_addr;
+    ::memset (&accept_addr, 0, sizeof accept_addr);
+    accept_addr.sin_len = sizeof accept_addr;
+
+    bool accept_connection = false;
+
+    // Loop until we are happy with our connection
+    while (!accept_connection)
+    {
+        socklen_t accept_addr_len = sizeof accept_addr;
+        m_fd = ::accept (listen_fd, (struct sockaddr *)&accept_addr, &accept_addr_len);
+
+        if (m_fd == -1)
+            err.SetError(errno, DNBError::POSIX);
+        
+        if (err.Fail() || DNBLogCheckLogBit(LOG_RNB_COMM))
+            err.LogThreaded("::accept ( socket = %i, address = %p, address_len = %u )", listen_fd, &accept_addr, accept_addr_len);
+
+        if (err.Fail())
+            break;
+
+        if (listen_addr.sin_addr.s_addr == INADDR_ANY)
+            accept_connection = true;
+        else
+        {
+            if (accept_addr_len == listen_addr.sin_len &&
+                accept_addr.sin_addr.s_addr == listen_addr.sin_addr.s_addr)
+            {
+                accept_connection = true;
+            }
+            else
+            {
+                ::close (m_fd);
+                m_fd = -1;
+                const uint8_t *accept_ip = (const uint8_t *)&accept_addr.sin_addr.s_addr;
+                const uint8_t *listen_ip = (const uint8_t *)&listen_addr.sin_addr.s_addr;
+                ::fprintf (stderr,
+                           "error: rejecting incoming connection from %u.%u.%u.%u (expecting %u.%u.%u.%u)\n",
+                           accept_ip[0], accept_ip[1], accept_ip[2], accept_ip[3],
+                           listen_ip[0], listen_ip[1], listen_ip[2], listen_ip[3]);
+                DNBLogThreaded ("error: rejecting connection from %u.%u.%u.%u (expecting %u.%u.%u.%u)",
+                                accept_ip[0], accept_ip[1], accept_ip[2], accept_ip[3],
+                                listen_ip[0], listen_ip[1], listen_ip[2], listen_ip[3]);
+            }
+        }
+    }
+
+    ClosePort (listen_fd, false);
+
+    if (err.Fail())
+    {
+        return rnb_err;
+    }
+    else
+    {
+        // Keep our TCP packets coming without any delays.
+        SetSocketOption (m_fd, IPPROTO_TCP, TCP_NODELAY, 1);
+    }
+
+    return rnb_success;
+}
+
+rnb_err_t
+RNBSocket::Connect (const char *host, uint16_t port)
+{
+    Disconnect (false);
+
+    // Create the socket
+    m_fd = ::socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
+    if (m_fd == -1)
+        return rnb_err;
+    
+    // Enable local address reuse
+    SetSocketOption (m_fd, SOL_SOCKET, SO_REUSEADDR, 1);
+    
+    struct sockaddr_in sa;
+    ::memset (&sa, 0, sizeof (sa));
+    sa.sin_family = AF_INET;
+    sa.sin_port = htons (port);
+    
+    if (!ResolveIPV4HostName(host, sa.sin_addr.s_addr))
+    {
+        DNBLogThreaded("error: failed to resolve host '%s'", host);
+        Disconnect (false);
+        return rnb_err;
+    }
+    
+    if (-1 == ::connect (m_fd, (const struct sockaddr *)&sa, sizeof(sa)))
+    {
+        Disconnect (false);
+        return rnb_err;
+    }
+    
+    // Keep our TCP packets coming without any delays.
+    SetSocketOption (m_fd, IPPROTO_TCP, TCP_NODELAY, 1);
+    return rnb_success;
+}
+
+rnb_err_t
+RNBSocket::useFD(int fd)
+{
+       if (fd < 0) {
+               DNBLogThreadedIf(LOG_RNB_COMM, "Bad file descriptor passed in.");
+               return rnb_err;
+       }
+       
+       m_fd = fd;
+       return rnb_success;
+}
+
+#ifdef WITH_LOCKDOWN
+rnb_err_t
+RNBSocket::ConnectToService()
+{
+    DNBLog("Connecting to com.apple.%s service...", DEBUGSERVER_PROGRAM_NAME);
+    // Disconnect from any previous connections
+    Disconnect(false);
+    if (::secure_lockdown_checkin (&m_ld_conn, NULL, NULL) != kLDESuccess)
+    {
+        DNBLogThreadedIf(LOG_RNB_COMM, "::secure_lockdown_checkin(&m_fd, NULL, NULL) failed");
+        m_fd = -1;
+        return rnb_not_connected;
+    }
+    m_fd = ::lockdown_get_socket (m_ld_conn);
+    if (m_fd == -1)
+    {
+        DNBLogThreadedIf(LOG_RNB_COMM, "::lockdown_get_socket() failed");
+        return rnb_not_connected;
+    }
+    m_fd_from_lockdown = true;
+    return rnb_success;
+}
+#endif
+
+rnb_err_t
+RNBSocket::OpenFile (const char *path)
+{
+    DNBError err;
+    m_fd = open (path, O_RDWR);
+    if (m_fd == -1)
+    {
+        err.SetError(errno, DNBError::POSIX);
+        err.LogThreaded ("can't open file '%s'", path);
+        return rnb_not_connected;
+    }
+    else
+    {
+        struct termios stdin_termios;
+
+        if (::tcgetattr (m_fd, &stdin_termios) == 0)
+        {
+            stdin_termios.c_lflag &= ~ECHO;     // Turn off echoing
+            stdin_termios.c_lflag &= ~ICANON;   // Get one char at a time
+            ::tcsetattr (m_fd, TCSANOW, &stdin_termios);
+        }
+    }
+    return rnb_success;
+}
+
+int
+RNBSocket::SetSocketOption(int fd, int level, int option_name, int option_value)
+{
+    return ::setsockopt(fd, level, option_name, &option_value, sizeof(option_value));
+}
+
+rnb_err_t
+RNBSocket::Disconnect (bool save_errno)
+{
+#ifdef WITH_LOCKDOWN
+    if (m_fd_from_lockdown)
+    {
+        m_fd_from_lockdown = false;
+        m_fd = -1;
+        lockdown_disconnect (m_ld_conn);
+        return rnb_success;
+    }
+#endif
+    return ClosePort (m_fd, save_errno);
+}
+
+
+rnb_err_t
+RNBSocket::Read (std::string &p)
+{
+    char buf[1024];
+    p.clear();
+
+    // Note that BUF is on the stack so we must be careful to keep any
+    // writes to BUF from overflowing or we'll have security issues.
+
+    if (m_fd == -1)
+        return rnb_err;
+
+    //DNBLogThreadedIf(LOG_RNB_COMM, "%8u RNBSocket::%s calling read()", (uint32_t)m_timer.ElapsedMicroSeconds(true), __FUNCTION__);
+    DNBError err;
+    ssize_t bytesread = read (m_fd, buf, sizeof (buf));
+    if (bytesread <= 0)
+        err.SetError(errno, DNBError::POSIX);
+    else
+        p.append(buf, bytesread);
+
+    if (err.Fail() || DNBLogCheckLogBit(LOG_RNB_COMM))
+        err.LogThreaded("::read ( %i, %p, %llu ) => %i", m_fd, buf, sizeof (buf), (uint64_t)bytesread);
+
+    // Our port went away - we have to mark this so IsConnected will return the truth.
+    if (bytesread == 0)
+    {
+        m_fd = -1;
+        return rnb_not_connected;
+    }
+    else if (bytesread == -1)
+    {
+        m_fd = -1;
+        return rnb_err;
+    }
+    // Strip spaces from the end of the buffer
+    while (!p.empty() && isspace (p[p.size() - 1]))
+        p.erase (p.size () - 1);
+
+    // Most data in the debugserver packets valid printable characters...
+    DNBLogThreadedIf(LOG_RNB_COMM, "read: %s", p.c_str());
+    return rnb_success;
+}
+
+rnb_err_t
+RNBSocket::Write (const void *buffer, size_t length)
+{
+    if (m_fd == -1)
+        return rnb_err;
+
+    DNBError err;
+    ssize_t bytessent = write (m_fd, buffer, length);
+    if (bytessent < 0)
+        err.SetError(errno, DNBError::POSIX);
+
+    if (err.Fail() || DNBLogCheckLogBit(LOG_RNB_COMM))
+        err.LogThreaded("::write ( socket = %i, buffer = %p, length = %llu) => %i", m_fd, buffer, length, (uint64_t)bytessent);
+
+    if (bytessent < 0)
+        return rnb_err;
+
+    if ((size_t)bytessent != length)
+        return rnb_err;
+
+    DNBLogThreadedIf(LOG_RNB_PACKETS, "putpkt: %*s", (int)length, (char *)buffer);   // All data is string based in debugserver, so this is safe
+    DNBLogThreadedIf(LOG_RNB_COMM, "sent: %*s", (int)length, (char *)buffer);
+
+    return rnb_success;
+}
+
+
+rnb_err_t
+RNBSocket::ClosePort (int& fd, bool save_errno)
+{
+    int close_err = 0;
+    if (fd > 0)
+    {
+        errno = 0;
+        close_err = close (fd);
+        fd = -1;
+    }
+    return close_err != 0 ? rnb_err : rnb_success;
+}
+
+