ReactOS  0.4.12-dev-51-ge94618b
net.c File Reference
#include "precomp.h"
Include dependency graph for net.c:

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Functions

void netfinger (char *name)
 

Function Documentation

◆ netfinger()

void netfinger ( char name)

Definition at line 40 of file net.c.

Referenced by userlist().

41 {
42  extern int lflag;
43  char c, lastc;
44  struct in_addr defaddr;
45  struct hostent *hp, def;
46  struct servent *sp;
47  struct sockaddr_in sin;
48  SOCKET s;
49  char *alist[1], *host;
50 
51  /* If this is a local request */
52  if (!(host = rindex(name, '@')))
53  return;
54 
55  *host++ = '\0';
56  if (isdigit(*host) && (defaddr.s_addr = inet_addr(host)) != (unsigned long)-1) {
57  def.h_name = host;
58  def.h_addr_list = alist;
59  def.h_addr = (char *)&defaddr;
60  def.h_length = sizeof(struct in_addr);
61  def.h_addrtype = AF_INET;
62  def.h_aliases = 0;
63  hp = &def;
64  } else if (!(hp = gethostbyname(host))) {
66  "finger: unknown host: %s\n", host);
67  return;
68  }
69  if (!(sp = getservbyname("finger", "tcp"))) {
70  (void)fprintf(stderr, "finger: tcp/finger: unknown service\n");
71  return;
72  }
73  sin.sin_family = hp->h_addrtype;
74  bcopy(hp->h_addr, (char *)&sin.sin_addr, hp->h_length);
75  sin.sin_port = sp->s_port;
76  if ((s = socket(hp->h_addrtype, SOCK_STREAM, 0)) == INVALID_SOCKET) {
77  perror("finger: socket");
78  return;
79  }
80 
81  /* have network connection; identify the host connected with */
82  (void)printf("[%s]\n", hp->h_name);
83  if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
84  fprintf(stderr, "finger: connect rc = %d", WSAGetLastError());
85  (void)closesocket(s);
86  return;
87  }
88 
89  /* -l flag for remote fingerd */
90  if (lflag)
91  send(s, "/W ", 3, 0);
92  /* send the name followed by <CR><LF> */
93  send(s, name, strlen(name), 0);
94  send(s, "\r\n", 2, 0);
95 
96  /*
97  * Read from the remote system; once we're connected, we assume some
98  * data. If none arrives, we hang until the user interrupts.
99  *
100  * If we see a <CR> or a <CR> with the high bit set, treat it as
101  * a newline; if followed by a newline character, only output one
102  * newline.
103  *
104  * Otherwise, all high bits are stripped; if it isn't printable and
105  * it isn't a space, we can simply set the 7th bit. Every ASCII
106  * character with bit 7 set is printable.
107  */
108  lastc = 0;
109  while (recv(s, &c, 1, 0) == 1) {
110  c &= 0x7f;
111  if (c == 0x0d) {
112  if (lastc == '\r') /* ^M^M - skip dupes */
113  continue;
114  c = '\n';
115  lastc = '\r';
116  } else {
117  if (!isprint(c) && !isspace(c))
118  c |= 0x40;
119  if (lastc != '\r' || c != '\n')
120  lastc = c;
121  else {
122  lastc = '\n';
123  continue;
124  }
125  }
126  putchar(c);
127  }
128  if (lastc != '\n')
129  putchar('\n');
130  putchar('\n');
131  (void)closesocket(s);
132 }
#define isspace(c)
Definition: acclib.h:69
char ** h_addr_list
Definition: winsock.h:138
struct png_info_def **typedef void(__cdecl typeof(png_destroy_read_struct))(struct png_struct_def **
Definition: typeof.h:47
SOCKET WSAAPI socket(IN INT af, IN INT type, IN INT protocol)
Definition: socklife.c:143
#define inet_addr(cp)
Definition: inet.h:98
ACPI_SIZE strlen(const char *String)
Definition: utclib.c:269
char * h_name
Definition: winsock.h:134
char * host
Definition: whois.c:55
char ** h_aliases
Definition: winsock.h:135
INT WSAAPI connect(IN SOCKET s, IN CONST struct sockaddr *name, IN INT namelen)
Definition: sockctrl.c:23
#define rindex(s, c)
Definition: various.h:30
#define closesocket
Definition: main.c:39
_CRTIMP void __cdecl perror(_In_opt_z_ const char *_ErrMsg)
_Check_return_opt_ _CRTIMP int __cdecl fprintf(_Inout_ FILE *_File, _In_z_ _Printf_format_string_ const char *_Format,...)
int putchar(int c)
Definition: crtsupp.c:12
short h_length
Definition: winsock.h:137
#define isdigit(c)
Definition: acclib.h:68
PHOSTENT WSAAPI gethostbyname(IN const char FAR *name)
Definition: getxbyxx.c:221
INT WSAAPI WSAGetLastError(VOID)
Definition: dllmain.c:112
PSERVENT WSAAPI getservbyname(IN const char FAR *name, IN const char FAR *proto)
Definition: getxbyxx.c:500
int lflag
Definition: finger.c:66
#define INVALID_SOCKET
Definition: winsock.h:332
#define bcopy(s1, s2, n)
Definition: various.h:25
INT WSAAPI send(IN SOCKET s, IN CONST CHAR FAR *buf, IN INT len, IN INT flags)
Definition: send.c:23
Definition: tcpip.h:125
GLdouble s
Definition: gl.h:2039
short h_addrtype
Definition: winsock.h:136
short s_port
Definition: winsock.h:165
#define isprint(c)
Definition: acclib.h:73
Definition: name.c:36
#define c
Definition: ke_i.h:80
FILE * stderr
#define AF_INET
Definition: tcpip.h:117
static const WCHAR sp[]
Definition: suminfo.c:288
UINT_PTR SOCKET
Definition: winsock.h:47
_STLP_DECLSPEC complex< float > _STLP_CALL sin(const complex< float > &)
#define SOCK_STREAM
Definition: tcpip.h:118
INT WSAAPI recv(IN SOCKET s, OUT CHAR FAR *buf, IN INT len, IN INT flags)
Definition: recv.c:23
#define printf
Definition: config.h:203