/*
* Tests for mailcap defined command's sanity
*/
int
mc_sane_command(char *command)
{
/* First, test that a command string actually exists */
if(command && *command){
#ifdef LATER
/*
* NOTE: Maybe we'll do this later. The problem is when the
* mailcap's been misconfigured. We then end up supressing
* valuable output when the user actually tries to launch the
* spec'd viewer.
*/
/* Second, Make sure we can get at it */
if(can_access_in_path(getenv("PATH"), command, EXECUTE_ACCESS) >= 0)
#endif
return(1);
}
return(0); /* failed! */
}
/*----------------------------------------------------------------------
Spawn a child process and optionally connect read/write pipes to it
Args: command -- string to hand the shell
outfile -- address of pointer containing file to receive output
errfile -- address of pointer containing file to receive error output
mode -- mode for type of shell, signal protection etc...
Returns: pointer to alloc'd PIPE_S on success, NULL otherwise
The outfile is either NULL, a pointer to a NULL value, or a pointer
to the requested name for the output file. In the pointer-to-NULL case
the caller doesn't care about the name, but wants to see the pipe's
results so we make one up. It's up to the caller to make sure the
free storage containing the name is cleaned up.
Mode bits serve several purposes.
PIPE_WRITE tells us we need to open a pipe to write the child's
stdin.
PIPE_READ tells us we need to open a pipe to read from the child's
stdout/stderr. *NOTE* Having neither of the above set means
we're not setting up any pipes, just forking the child and exec'ing
the command. Also, this takes precedence over any named outfile.
PIPE_STDERR means we're to tie the childs stderr to the same place
stdout is going. *NOTE* This only makes sense then if PIPE_READ
or an outfile is provided. Also, this takes precedence over any
named errfile.
PIPE_RESET means we reset the terminal mode to what it was before
we started pine and then exec the command. In PC-Pine, _RESET
was a shortcut for just executing a command. We'll try to pay
attention to the above flags to make sure we do the right thing.
PIPE_PROT means to protect the child from the usual nasty signals
that might cause premature death. Otherwise, the default signals are
set so the child can deal with the nasty signals in its own way.
NOT USED UNDER WINDOWS
PIPE_NOSHELL means we're to exec the command without the aid of
a system shell. *NOTE* This negates the affect of PIPE_USER.
NOT USED UNDER WINDOWS
PIPE_USER means we're to try executing the command in the user's
shell. Right now we only look in the environment, but that may get
more sophisticated later.
NOT USED UNDER WINDOWS
PIPE_RUNNOW was added for WINDOWS for the case pipe is called to run
a shell program (like for url viewing). This is the only option
where we don't wait for child termination, and is only obeyed if
PIPE_WRITE and PIPE_READ aren't set
----*/
PIPE_S *
open_system_pipe(char *command, char **outfile, char **errfile, int mode,
int timeout, void (*pipecb_f)(PIPE_S *, int, void *),
void (*piperr_f)(char *))
{
PIPE_S *syspipe = NULL;
#ifdef _WINDOWS
int exit_code = 0;
char cmdbuf[1024];
unsigned flags = 0;
#else
char shellpath[MAXPATH+1], *shell;
int p[2], oparentd = -1, ochildd = -1, iparentd = -1, ichildd = -1;
#endif
#ifdef _WINDOWS
if(mode & PIPE_STDERR)
flags |= MSWIN_EAW_CAPT_STDERR;
/*
* It'll be a lot more difficult to support READing and WRITing.
* This was never supported, and there don't look to be any cases
* that set both of these flags anymore for win32.
*
* errfile could probably be supported pretty easily
*/
if(errfile){
if(piperr_f)
(*piperr_f)("Pipe arg not yet supported: Error File");
return(NULL);
}
if((mode & PIPE_RUNNOW)
&& !(mode & (PIPE_WRITE | PIPE_READ | PIPE_STDERR))){
if(mswin_shell_exec(command, NULL) == 0
&& (syspipe = (PIPE_S *) malloc(sizeof(PIPE_S))) != NULL){
memset(syspipe, 0, sizeof(PIPE_S));
return(syspipe);
}
return(NULL);
}
strncpy(cmdbuf, command, sizeof(cmdbuf));
cmdbuf[sizeof(cmdbuf)-1] = '\0';
if((syspipe = (PIPE_S *) malloc(sizeof(PIPE_S))) == NULL)
return(NULL);
memset(syspipe, 0, sizeof(PIPE_S));
syspipe->mode = mode;
if(!outfile){
syspipe->deloutfile = 1;
if(mode & PIPE_READ){
syspipe->outfile = temp_nam(NULL, "po");
our_unlink(syspipe->outfile);
}
}
else{
if(!*outfile) /* asked for, but not named? */
*outfile = temp_nam(NULL, "po");
our_unlink(*outfile);
syspipe->outfile = (char *) malloc((strlen(*outfile)+1)*sizeof(char));
snprintf(syspipe->outfile, strlen(*outfile)+1, "%s", *outfile);
}
if(mode & PIPE_WRITE){
/*
* Create tmp file to write, spawn child in close_pipe
* after tmp file's written...
*/
syspipe->infile = temp_nam(NULL, "pw");
syspipe->out.f = our_fopen(syspipe->infile, "wb");
syspipe->command = (char *) malloc((strlen(cmdbuf)+1)*sizeof(char));
snprintf(syspipe->command, strlen(cmdbuf)+1, "%s", cmdbuf);
dprint((1, "pipe write: %s", cmdbuf));
}
else if(mode & PIPE_READ){
/*
* Create a tmp file for command result, exec the command
* here into temp file, and return file pointer to it...
*/
syspipe->command = (char *) malloc((strlen(cmdbuf)+1)*sizeof(char));
snprintf(syspipe->command, strlen(cmdbuf)+1, "%s", cmdbuf);
dprint((1, "pipe read: %s", cmdbuf));
if(pipe_mswin_exec_wrapper("pipe command", syspipe,
flags, pipecb_f, piperr_f)){
if(syspipe->outfile){
free((void *) syspipe->outfile);
syspipe->outfile = NULL;
}
zot_pipe(&syspipe);
}
else{
syspipe->in.f = our_fopen(syspipe->outfile, "rb");
syspipe->exit_code = exit_code;
}
}
else{
/* we just run the command taking outfile into account */
syspipe->command = (char *) malloc((strlen(cmdbuf)+1)*sizeof(char));
snprintf(syspipe->command, strlen(cmdbuf)+1, "%s", cmdbuf);
if(pipe_mswin_exec_wrapper("pipe command", syspipe,
flags, pipecb_f, piperr_f)){
if(syspipe->outfile){
free((void *) syspipe->outfile);
syspipe->outfile = NULL;
}
zot_pipe(&syspipe);
}
else
syspipe->exit_code = exit_code;
}
#else /* !_WINDOWS */
if((syspipe = (PIPE_S *) malloc(sizeof(PIPE_S))) == NULL)
return(NULL);
memset(syspipe, 0, sizeof(PIPE_S));
syspipe->mode = mode;
/*
* If we're not using the shell's command parsing smarts, build
* argv by hand...
*/
if(mode & PIPE_NOSHELL){
char **ap, *p;
size_t n;
/* parse the arguments into argv */
for(p = command; *p && isspace((unsigned char)(*p)); p++)
; /* swallow leading ws */
if(*p){
int l = strlen(p);
if((syspipe->args = (char *) malloc((l + 1) * sizeof(char))) != NULL){
strncpy(syspipe->args, p, l);
syspipe->args[l] = '\0';
}
else{
if(piperr_f)
(*piperr_f)(pipe_error_msg("<null>", "execute",
"Can't allocate command string"));
zot_pipe(&syspipe);
return(NULL);
}
}
else{
if(piperr_f)
(*piperr_f)(pipe_error_msg("<null>", "execute",
"No command name found"));
zot_pipe(&syspipe);
return(NULL);
}
for(p = syspipe->args, n = 2; *p; p++) /* count the args */
if(isspace((unsigned char)(*p))
&& *(p+1) && !isspace((unsigned char)(*(p+1))))
n++;
if ((syspipe->argv = ap = (char **)malloc(n * sizeof(char *))) == NULL){
zot_pipe(&syspipe);
return(NULL);
}
memset(syspipe->argv, 0, n * sizeof(char *));
for(p = syspipe->args; *p; ){ /* collect args */
while(*p && isspace((unsigned char)(*p)))
*p++ = '\0';
*ap++ = (*p) ? p : NULL;
while(*p && !isspace((unsigned char)(*p)))
p++;
}
/* make sure argv[0] exists in $PATH */
if(can_access_in_path(getenv("PATH"), syspipe->argv[0],
EXECUTE_ACCESS) < 0){
if(piperr_f)
(*piperr_f)(pipe_error_msg(syspipe->argv[0], "access",
error_description(errno)));
zot_pipe(&syspipe);
return(NULL);
}
}
/* fill in any output filenames */
if(!(mode & PIPE_READ)){
if(outfile && !*outfile)
*outfile = temp_nam(NULL, "pine_p"); /* asked for, but not named? */
if(errfile && !*errfile)
*errfile = temp_nam(NULL, "pine_p"); /* ditto */
}
/* create pipes */
if(mode & (PIPE_WRITE | PIPE_READ)){
if(mode & PIPE_WRITE){
pipe(p); /* alloc pipe to write child */
oparentd = p[STDOUT_FILENO];
ichildd = p[STDIN_FILENO];
}
if(mode & PIPE_READ){
pipe(p); /* alloc pipe to read child */
iparentd = p[STDIN_FILENO];
ochildd = p[STDOUT_FILENO];
}
}
if(pipecb_f) /* let caller prep display */
(*pipecb_f)(syspipe, OSB_PRE_OPEN, NULL);
if((syspipe->pid = vfork()) == 0){
/* reset child's handlers in requested fashion... */
(void)signal(SIGINT, (mode & PIPE_PROT) ? SIG_IGN : SIG_DFL);
(void)signal(SIGQUIT, (mode & PIPE_PROT) ? SIG_IGN : SIG_DFL);
(void)signal(SIGHUP, (mode & PIPE_PROT) ? SIG_IGN : SIG_DFL);
#ifdef SIGCHLD
(void) signal(SIGCHLD, SIG_DFL);
#endif
/* if parent isn't reading, and we have a filename to write */
if(!(mode & PIPE_READ) && outfile){ /* connect output to file */
int output = our_creat(*outfile, 0600);
dup2(output, STDOUT_FILENO);
if(mode & PIPE_STDERR)
dup2(output, STDERR_FILENO);
else if(errfile)
dup2(our_creat(*errfile, 0600), STDERR_FILENO);
}
if(mode & PIPE_WRITE){ /* connect process input */
close(oparentd);
dup2(ichildd, STDIN_FILENO); /* tie stdin to pipe */
close(ichildd);
}
if(mode & PIPE_READ){ /* connect process output */
close(iparentd);
dup2(ochildd, STDOUT_FILENO); /* tie std{out,err} to pipe */
if(mode & PIPE_STDERR)
dup2(ochildd, STDERR_FILENO);
else if(errfile)
dup2(our_creat(*errfile, 0600), STDERR_FILENO);
close(ochildd);
}
if(mode & PIPE_NOSHELL){
execvp(syspipe->argv[0], syspipe->argv);
}
else{
if(mode & PIPE_USER){
char *env, *sh;
if((env = getenv("SHELL")) && (sh = strrchr(env, '/'))){
shell = sh + 1;
strncpy(shellpath, env, sizeof(shellpath)-1);
shellpath[sizeof(shellpath)-1] = '\0';
}
else{
shell = "csh";
strncpy(shellpath, "/bin/csh", sizeof(shellpath)-1);
shellpath[sizeof(shellpath)-1] = '\0';
}
}
else{
shell = "sh";
strncpy(shellpath, "/bin/sh", sizeof(shellpath)-1);
shellpath[sizeof(shellpath)-1] = '\0';
}
execl(shellpath, shell, command ? "-c" : (char *)NULL, fname_to_locale(command), (char *)NULL);
}
fprintf(stderr, "Can't exec %s\nReason: %s",
command, error_description(errno));
_exit(-1);
}
if((child_pid = syspipe->pid) > 0){
syspipe->isig = signal(SIGINT, SIG_IGN); /* Reset handlers to make */
syspipe->qsig = signal(SIGQUIT, SIG_IGN); /* sure we don't come to */
syspipe->hsig = signal(SIGHUP, SIG_IGN); /* a premature end... */
if((syspipe->timeout = timeout) != 0){
syspipe->alrm = signal(SIGALRM, pipe_alarm);
syspipe->old_timeo = alarm(timeout);
}
if(mode & PIPE_WRITE){
close(ichildd);
if(mode & PIPE_DESC)
syspipe->out.d = oparentd;
else
syspipe->out.f = fdopen(oparentd, "w");
}
if(mode & PIPE_READ){
close(ochildd);
if(mode & PIPE_DESC)
syspipe->in.d = iparentd;
else
syspipe->in.f = fdopen(iparentd, "r");
}
}
else{
if(mode & (PIPE_WRITE | PIPE_READ)){
if(mode & PIPE_WRITE){
close(oparentd);
close(ichildd);
}
if(mode & PIPE_READ){
close(iparentd);
close(ochildd);
}
}
if(pipecb_f) /* let caller fixup display */
(*pipecb_f)(syspipe, OSB_POST_OPEN, NULL);
if(outfile && *outfile){
our_unlink(*outfile);
free((void *) *outfile);
*outfile = NULL;
}
if(errfile && *errfile){
our_unlink(*errfile);
free((void *) *errfile);
*errfile = NULL;
}
if(piperr_f)
(*piperr_f)(pipe_error_msg(command, "fork",
error_description(errno)));
zot_pipe(&syspipe);
}
#endif /* UNIX */
return(syspipe);
}
