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glibc  2.9
Functions | Variables
rexec.c File Reference
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <alloca.h>
#include <stdio.h>
#include <netdb.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/uio.h>

Go to the source code of this file.

Functions

 libc_freeres_ptr (static char *ahostbuf)
int rexec_af (char **ahost, int rport, const char *name, const char *pass, const char *cmd, int *fd2p, sa_family_t af)
 libc_hidden_def (rexec_af)

Variables

int rexecoptions

Function Documentation

libc_freeres_ptr ( static char *  ahostbuf)

Definition at line 193 of file rexec.c.

{
       return rexec_af(ahost, rport, name, pass, cmd, fd2p, AF_INET);
}

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int rexec_af ( char **  ahost,
int  rport,
const char *  name,
const char *  pass,
const char *  cmd,
int fd2p,
sa_family_t  af 
)

Definition at line 52 of file rexec.c.

{
       struct sockaddr_storage sa2, from;
       struct addrinfo hints, *res0;
       const char *orig_name = name;
       const char *orig_pass = pass;
       u_short port = 0;
       int s, timo = 1, s3;
       char c;
       int gai;
       char servbuff[NI_MAXSERV];

       __snprintf(servbuff, sizeof(servbuff), "%d", ntohs(rport));
       servbuff[sizeof(servbuff) - 1] = '\0';

       memset(&hints, '\0', sizeof(hints));
       hints.ai_family = af;
       hints.ai_socktype = SOCK_STREAM;
       hints.ai_flags = AI_CANONNAME;
       gai = getaddrinfo(*ahost, servbuff, &hints, &res0);
       if (gai){
              /* XXX: set errno? */
              return -1;
       }

       if (res0->ai_canonname){
              free (ahostbuf);
              ahostbuf = strdup (res0->ai_canonname);
              if (ahostbuf == NULL) {
                     perror ("rexec: strdup");
                     return (-1);
              }
              *ahost = ahostbuf;
       } else {
              *ahost = NULL;
              __set_errno (ENOENT);
              return -1;
       }
       ruserpass(res0->ai_canonname, &name, &pass);
retry:
       s = __socket(res0->ai_family, res0->ai_socktype, 0);
       if (s < 0) {
              perror("rexec: socket");
              return (-1);
       }
       if (__connect(s, res0->ai_addr, res0->ai_addrlen) < 0) {
              if (errno == ECONNREFUSED && timo <= 16) {
                     (void) __close(s);
                     __sleep(timo);
                     timo *= 2;
                     goto retry;
              }
              perror(res0->ai_canonname);
              return (-1);
       }
       if (fd2p == 0) {
              (void) __write(s, "", 1);
              port = 0;
       } else {
              char num[32];
              int s2;
              socklen_t sa2len;

              s2 = __socket(res0->ai_family, res0->ai_socktype, 0);
              if (s2 < 0) {
                     (void) __close(s);
                     return (-1);
              }
              __listen(s2, 1);
              sa2len = sizeof (sa2);
              if (__getsockname(s2, (struct sockaddr *)&sa2, &sa2len) < 0) {
                     perror("getsockname");
                     (void) __close(s2);
                     goto bad;
              } else if (sa2len != SA_LEN((struct sockaddr *)&sa2)) {
                     __set_errno(EINVAL);
                     (void) __close(s2);
                     goto bad;
              }
              port = 0;
              if (!getnameinfo((struct sockaddr *)&sa2, sa2len,
                             NULL, 0, servbuff, sizeof(servbuff),
                             NI_NUMERICSERV))
                     port = atoi(servbuff);
              (void) sprintf(num, "%u", port);
              (void) __write(s, num, strlen(num)+1);
              { socklen_t len = sizeof (from);
                s3 = TEMP_FAILURE_RETRY (accept(s2, (struct sockaddr *)&from,
                                            &len));
                __close(s2);
                if (s3 < 0) {
                     perror("accept");
                     port = 0;
                     goto bad;
                }
              }
              *fd2p = s3;
       }

       struct iovec iov[3] =
         {
           [0] = { .iov_base = (void *) name, .iov_len = strlen (name) + 1 },
           /* should public key encypt the password here */
           [1] = { .iov_base = (void *) pass, .iov_len = strlen (pass) + 1 },
           [2] = { .iov_base = (void *) cmd, .iov_len = strlen (cmd) + 1 }
         };
       (void) TEMP_FAILURE_RETRY (__writev (s, iov, 3));

       /* We don't need the memory allocated for the name and the password
          in ruserpass anymore.  */
       if (name != orig_name)
         free ((char *) name);
       if (pass != orig_pass)
         free ((char *) pass);

       if (__read(s, &c, 1) != 1) {
              perror(*ahost);
              goto bad;
       }
       if (c != 0) {
              while (__read(s, &c, 1) == 1) {
                     (void) __write(2, &c, 1);
                     if (c == '\n')
                            break;
              }
              goto bad;
       }
       freeaddrinfo(res0);
       return (s);
bad:
       if (port)
              (void) __close(*fd2p);
       (void) __close(s);
       freeaddrinfo(res0);
       return (-1);
}

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Variable Documentation

Definition at line 48 of file rexec.c.