/*
* Read a line from the user. Call our buf_args() function to
* break it into an argv-style array, and call userfunc() to
* process the arguments.
*/
int
prompt_read(char *prompt, int (*userfunc)(int, char **))
{
int n;
char c, *ptr;
tty_reset(STDIN_FILENO); /* allow user's editing chars */
n = strlen(prompt);
if (write(STDOUT_FILENO, prompt, n) != n)
err_sys("write error");
ptr = cmdargs;
for ( ; ; ) {
if ((n = read(STDIN_FILENO, &c, 1)) < 0)
err_sys("read error");
else if (n == 0)
break;
if (c == '\n')
break;
if (ptr < &cmdargs[MAXLINE-2])
*ptr++ = c;
}
*ptr = 0; /* null terminate */
tty_raw(STDIN_FILENO); /* reset tty mode to raw */
/*
* Return whatever userfunc() returns.
*/
return(buf_args(cmdargs, userfunc));
}
void request(char *buf, int nread, int fd)
{
int newfd;
if (buf[nread-1] != 0)
{
sprintf(errmsg, "request not null terminated:%*.*s\n", nread, nread, buf);
send_err(fd, -1, errmsg);
return;
}
if (buf_args(buf, cli_args) < 0) {
send_err(fd, -1, errmsg);
return;
}
if ( (newfd = open(pathname, oflag)) < 0)
{
sprintf(errmsg, "can't open %s: %s\n", pathname, strerror(errno));
send_err(fd, -1, errmsg);
return;
}
if (send_fd(fd, newfd) < 0)
err_sys("send_fd error", errno);
close(newfd);
}
void
handle_request(char *buf, int nread, int fd)
{
int newfd;
if (buf[nread-1] != 0) {
snprintf(errmsg, MAXLINE-1,
"request not null terminated: %*.*s\n", nread, nread, buf);
send_err(fd, -1, errmsg);
return;
}
if (buf_args(buf, cli_args) < 0) { /* parse args & set options */
send_err(fd, -1, errmsg);
return;
}
if ((newfd = open(pathname, oflag)) < 0) {
snprintf(errmsg, MAXLINE-1, "can't open %s: %s\n", pathname,
strerror(errno));
send_err(fd, -1, errmsg);
return;
}
if (send_fd(fd, newfd) < 0) /* send the descriptor */
err_sys("send_fd error");
close(newfd); /* we're done with descriptor */
}
void handle_request(char *buf, int nread, int clifd, uid_t uid)
{
int newfd;
if (buf[nread - 1] != 0) {
snprintf(errmsg, MAXLINE - 1,
"request from uid %d not null terminated: %*.*s\n",
uid, nread, nread, buf);
send_err(clifd, -1, errmsg);
return;
}
log_msg("request: %s, from uid %d", buf, uid);
/* parse the arguments, set options */
if (buf_args(buf, cli_args) < 0) {
send_err(clifd, -1, errmsg);
log_msg(errmsg);
return;
}
if ((newfd = open(pathname, oflag)) < 0) {
snprintf(errmsg, MAXLINE - 1, "can't open %s: %s\n",
pathname, strerror(errno));
send_err(clifd, -1, errmsg);
log_msg(errmsg);
return;
}
/* send the desrciptor */
if (send_fd(clifd, newfd) < 0)
log_sys("send_fd error");
log_msg("send fd %d over fd %d for %s", newfd, clifd, pathname);
close(newfd); /* we're done with desrciptor */
}
void
handle_request(char *buf, int nread, int fd)
{
int newfd;
if (buf[nread-1] != 0) {
snprintf(errmsg, MAXLINE-1,
"request not null terminated: %*.*s\n", nread, nread, buf);
send_err(fd, -1, errmsg);
return;
}
if (buf_args(buf, cli_args) < 0) { /* 将客户进程请求分解成标准argv型的参数表，调用cli_args处理客户进程的参数*/
send_err(fd, -1, errmsg);
return;
}
if ((newfd = open(pathname, oflag)) < 0) { // 打开相应文件
snprintf(errmsg, MAXLINE-1, "can't open %s: %s\n", pathname,
strerror(errno));
send_err(fd, -1, errmsg);
return;
}
if (send_fd(fd, newfd) < 0) /* 经由fd管道将描述符回送给客户进程*/
err_sys("send_fd error");
close(newfd); /* we're done with descriptor */
}
void handle_request(char *buf, int nread, int fd)
{
int newfd;
if (buf[nread - 1] != 0) {
/*
* "%*.*s", m, n, "string"
* total field width is m
* precision is n.
* this manner can limit print max(m, n) chars up to
* max(n, m)
*/
snprintf(errmsg, MAXLINE - 1,
"request not null terminated: %*.*s\n",
nread, nread, buf);
send_err(fd, -1, errmsg);
return;
}
if (buf_args(buf, cli_args) < 0) { /* parse args & set options */
send_err(fd, -1, errmsg);
return;
}
if ((newfd = open(pathname, oflag)) < 0) {
snprintf(errmsg, MAXLINE - 1, "can't open %s: %s\n", pathname,
strerror(errno));
send_err(fd, -1, errmsg);
return;
}
if (send_fd(fd, newfd) < 0) /* send the descriptor */
err_sys("send_fd error");
close(newfd); /* we're done with descriptor */
}
static void msg_parse_arg(char *buf, int nread, int clifd, uid_t uid)
{
int newfd;
int res;
if (buf[nread-1] != 0) {
dlog(L_ERR, "request from uid %d not null terminated: %*.*s\n",
uid, nread, nread, buf);
serv_send_ack(clifd, -1);
return;
}
dlog(L_INFO, "request: %s, from uid %d\n", buf, uid);
/* parse the arguments, set options */
if ((res = buf_args(buf, clifd, msg_arg_handle)) < 0) {
serv_send_ack(clifd, res);
dlog(L_ERR, "parse arg from uid %d error\n", uid);
return;
}
serv_send_ack(clifd, 0);
}