Sockets, Shellcode, Porting, and Coding: Reverse Engineering Exploits and Tool Coding for Security Professionals

110

111

printf("listen() ok!\n");

112

113

cl = accept(sd, (struct sockaddr *) &sin, &len);

114 #ifdef WIN32

115 if(cl == SOCKET_ERROR)

116 #else

117 if(cl < 0)

118 #endif

119 {

120 printf("accept() failed.\n");

121 return(1);

122 }

123

124

printf("connection received.\n");

125

126

return(0);

127 }

Analysis

■

At line 113, the accept() function is called.

■

At lines 114 through 117, the return value from the accept() function is handled

in the same manner as that of the connect() function in Example 7.7.

select()

The UNIX select function signature and required header files are:

#include <sys/types.h>

#include <sys/socket.h>

int select(int nfds ,

fd_set *readfds ,

fd_set *writefds ,

fd_set *exceptfds,

const

struct timeval *timeout );

The Win32 select function signature and required ...