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Get rid of unsafe system(3) calls

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Arun Prakash Jana 2017-05-15 18:22:00 +05:30
parent 463c270caf
commit ba49beac79
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GPG key ID: A75979F35C080412
2 changed files with 67 additions and 53 deletions
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2
README.md
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@ -52,7 +52,7 @@ Have fun with it! PRs are welcome. Check out [#1](https://github.com/jarun/nnn/i
<p align="center">
<a href="https://saythanks.io/to/jarun"><img src="https://img.shields.io/badge/say-thanks!-ff69b4.svg" /></a>
<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=RMLTQ76JSXJ4Q"><img src="https://img.shields.io/badge/PayPal-donate-5DADE2.svg" alt="Donate via PayPal!" /></a>
<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=RMLTQ76JSXJ4Q"><img src="https://img.shields.io/badge/PayPal-donate-FC746D.svg" alt="Donate via PayPal!" /></a>
</p>
### Features

118
nnn.c
View file

@ -1027,11 +1027,16 @@ get_lsperms(mode_t mode, char *desc)
return(bits);
}
/* Gets only a single line, that's what we need for now */
/*
* Gets only a single line (that's what we need
* for now) or shows full command output in pager.
*
* If pager is valid, returns NULL
*/
static char *
get_output(char *buf, size_t bytes, char *file, char *arg1, char *arg2)
get_output(char *buf, size_t bytes, char *file, char *arg1, char *arg2, int pager)
{
pid_t pid = 0;
pid_t pid;
int pipefd[2];
FILE* pf;
int status;
@ -1041,7 +1046,6 @@ get_output(char *buf, size_t bytes, char *file, char *arg1, char *arg2)
printerr(1, "pipe(2)");
pid = fork();
if (pid == 0) {
/* In child */
close(pipefd[0]);
@ -1052,15 +1056,30 @@ get_output(char *buf, size_t bytes, char *file, char *arg1, char *arg2)
}
/* In parent */
waitpid(pid, &status, 0);
close(pipefd[1]);
if ((pf = fdopen(pipefd[0], "r"))) {
ret = fgets(buf, bytes, pf);
close(pipefd[0]);
if (!pager) {
if ((pf = fdopen(pipefd[0], "r"))) {
ret = fgets(buf, bytes, pf);
close(pipefd[0]);
}
return ret;
}
pid = fork();
if (pid == 0) {
/* Show in pager in child */
dup2(pipefd[0], STDIN_FILENO);
execlp("less", "less", NULL);
close(pipefd[0]);
_exit(1);
}
/* In parent */
waitpid(pid, &status, 0);
return ret;
return NULL;
}
/*
@ -1135,7 +1154,7 @@ show_stats(char* fpath, char* fname, struct stat *sb)
if (S_ISREG(sb->st_mode)) {
/* Show file(1) output */
p = get_output(g_buf, MAX_CMD_LEN, "file", "-b", fpath);
p = get_output(g_buf, MAX_CMD_LEN, "file", "-b", fpath, 0);
if (p) {
dprintf(fd, "\n\n ");
while (*p) {
@ -1149,32 +1168,29 @@ show_stats(char* fpath, char* fname, struct stat *sb)
}
dprintf(fd, " %s", begin);
}
}
dprintf(fd, "\n\n");
dprintf(fd, "\n\n");
} else
dprintf(fd, "\n\n\n");
close(fd);
sprintf(g_buf, "cat %s | less", tmp);
fd = system(g_buf);
get_output(NULL, 0, "cat", tmp, NULL, 1);
unlink(tmp);
return fd;
return 0;
}
static int
show_mediainfo(const char* fpath, int full)
show_mediainfo(char* fpath, char *arg)
{
strcpy(g_buf, "which mediainfo");
if (get_output(g_buf, MAX_CMD_LEN, "which", "mediainfo", NULL) == NULL)
if (get_output(g_buf, MAX_CMD_LEN, "which", "mediainfo", NULL, 0) == NULL)
return -1;
sprintf(g_buf, "mediainfo \'%s\' ", fpath);
if (full)
strcat(g_buf, "-f 2>&1 | less");
else
strcat(g_buf, "2>&1 | less");
exitcurses();
get_output(NULL, 0, "mediainfo", fpath, arg, 1);
initcurses();
return system(g_buf);
return 0;
}
static int
@ -1612,7 +1628,8 @@ nochange:
/* If nlay doesn't handle it, open plain text
files with vi, then try NNN_FALLBACK_OPENER */
if (get_output(g_buf, MAX_CMD_LEN, "file", "-bi", newpath) == NULL)
if (get_output(g_buf, MAX_CMD_LEN, "file", "-bi",
newpath, 0) == NULL)
continue;
if (strstr(g_buf, "text/") == g_buf) {
@ -1881,48 +1898,45 @@ nochange:
{
struct stat sb;
if (ndents > 0)
if (ndents > 0) {
mkpath(path, dents[cur].name, oldpath, PATH_MAX);
r = lstat(oldpath, &sb);
if (r == -1) {
if (dents)
dentfree(dents);
printerr(1, "lstat");
} else {
exitcurses();
r = show_stats(oldpath, dents[cur].name, &sb);
initcurses();
if (r < 0) {
printmsg(strerror(errno));
goto nochange;
r = lstat(oldpath, &sb);
if (r == -1) {
if (dents)
dentfree(dents);
printerr(1, "lstat");
} else {
exitcurses();
r = show_stats(oldpath, dents[cur].name, &sb);
initcurses();
if (r < 0) {
printmsg(strerror(errno));
goto nochange;
}
}
}
break;
}
case SEL_MEDIA:
if (ndents > 0)
if (ndents > 0) {
mkpath(path, dents[cur].name, oldpath, PATH_MAX);
exitcurses();
r = show_mediainfo(oldpath, FALSE);
initcurses();
if (r < 0) {
printmsg("mediainfo missing");
goto nochange;
if(show_mediainfo(oldpath, NULL) == -1) {
printmsg("mediainfo missing");
goto nochange;
}
}
break;
case SEL_FMEDIA:
if (ndents > 0)
if (ndents > 0) {
mkpath(path, dents[cur].name, oldpath, PATH_MAX);
exitcurses();
r = show_mediainfo(oldpath, TRUE);
initcurses();
if (r < 0) {
printmsg("mediainfo missing");
goto nochange;
if(show_mediainfo(oldpath, "-f") == -1) {
printmsg("mediainfo missing");
goto nochange;
}
}
break;
case SEL_DFB: