262 lines
4.4 KiB
C
262 lines
4.4 KiB
C
/**
|
|
* @file websh.c
|
|
* @date 2018-04-16
|
|
*
|
|
* @brief Formats program output for the web.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
|
|
#include <sys/wait.h>
|
|
|
|
#define MAX_LEN 256
|
|
#define MAX_LINES 1024
|
|
|
|
/**
|
|
* @details Global variable for the program name.
|
|
*/
|
|
static const char *pname;
|
|
|
|
/**
|
|
* @details Global variable for the e-Flag.
|
|
*/
|
|
static int eFlag = 0;
|
|
|
|
/**
|
|
* @details Global variable for the h-Flag.
|
|
*/
|
|
static int hFlag = 0;
|
|
|
|
/**
|
|
* @details Global variable for the s-Flag.
|
|
*/
|
|
static int sFlag = 0;
|
|
|
|
/**
|
|
* @details Global variable for the supplied word.
|
|
*/
|
|
static const char *word;
|
|
|
|
/**
|
|
* @details Global variable for the supplied tag.
|
|
*/
|
|
static const char *tag;
|
|
|
|
/**
|
|
* @details Global array which saves the supplied linux commands.
|
|
*/
|
|
static char *lines[MAX_LINES] = {NULL};
|
|
|
|
/**
|
|
* @detals Variable which gets set on signal received.
|
|
*/
|
|
volatile sig_atomic_t quit = 0;
|
|
|
|
static void handle_signal(int signal)
|
|
{
|
|
quit = 1;
|
|
}
|
|
|
|
void usage(void)
|
|
{
|
|
fprintf(stderr, "Usage: websh [-e] [-h] [-s WORD:TAG]\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
void parsesArg(char *sArg)
|
|
{
|
|
char *token;
|
|
int i = 0;
|
|
while ((token = strsep(&sArg, ":"))) {
|
|
if (strcmp(token, "") == 0)
|
|
usage();
|
|
if (i == 2)
|
|
usage();
|
|
if (i == 0) {
|
|
word = token;
|
|
} else {
|
|
tag = token;
|
|
}
|
|
i++;
|
|
}
|
|
}
|
|
|
|
void parse(int argc, char *argv[])
|
|
{
|
|
int optInd = 0;
|
|
char *sArg;
|
|
|
|
while ((optInd = getopt(argc, argv, "ehs:")) != -1) {
|
|
switch (optInd) {
|
|
case 'e':
|
|
if (eFlag != 0) {
|
|
usage();
|
|
} else {
|
|
eFlag = 1;
|
|
}
|
|
break;
|
|
case 'h':
|
|
if (hFlag != 0) {
|
|
usage();
|
|
} else {
|
|
hFlag = 1;
|
|
}
|
|
break;
|
|
case 's':
|
|
if (sFlag != 0) {
|
|
usage();
|
|
} else {
|
|
sFlag = 1;
|
|
sArg = optarg;
|
|
parsesArg(sArg);
|
|
}
|
|
break;
|
|
case '?':
|
|
usage();
|
|
default:
|
|
assert(0);
|
|
|
|
}
|
|
}
|
|
|
|
pname = argv[0];
|
|
}
|
|
|
|
void child2(int fd[], char *line)
|
|
{
|
|
/* CHILD TWO */
|
|
char readbuffer[MAX_LEN];
|
|
close(fd[1]);
|
|
int nbytes = read(fd[0], readbuffer, MAX_LEN);
|
|
if (nbytes == -1) {
|
|
perror(pname);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
readbuffer[nbytes-1] = '\0';
|
|
if (eFlag && (strcmp(line, lines[0]) == 0)) {
|
|
printf("<html><head></head><body>\n");
|
|
}
|
|
if (hFlag) {
|
|
char *pch = strstr(line, "\n");
|
|
if (pch != NULL)
|
|
strncpy(pch, "\0", 1);
|
|
printf("<h1>%s</h1>\n", line);
|
|
}
|
|
if (sFlag) {
|
|
if (strstr(readbuffer, word) != NULL) {
|
|
printf("<%s>%s</%s><br />\n", tag, readbuffer, tag);
|
|
} else {
|
|
printf("%s<br />\n", readbuffer);
|
|
}
|
|
} else {
|
|
printf("%s<br />\n", readbuffer);
|
|
}
|
|
int i = 0;
|
|
while (lines[i] != NULL) {
|
|
i++;
|
|
}
|
|
if (eFlag && (strcmp(line, lines[i-1]) == 0)) {
|
|
printf("</body></html>\n");
|
|
}
|
|
return;
|
|
}
|
|
|
|
void child1(int fd[], char *line)
|
|
{
|
|
/* CHILD ONE */
|
|
close(fd[0]);
|
|
dup2(fd[1], STDOUT_FILENO);
|
|
execl("/bin/bash", "/bin/bash", "-c", line, (char *) NULL);
|
|
fprintf(stderr, "[%s] exec failed\n", pname);
|
|
free(line);
|
|
exit(EXIT_FAILURE);
|
|
return;
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
parse(argc, argv);
|
|
|
|
struct sigaction sa;
|
|
memset(&sa, 0, sizeof(sa));
|
|
sa.sa_handler = handle_signal;
|
|
sigaction(SIGINT, &sa, NULL);
|
|
sigaction(SIGTERM, &sa, NULL);
|
|
|
|
while (quit == 0) {
|
|
char *line = NULL;
|
|
size_t len = 0;
|
|
ssize_t nread;
|
|
int status;
|
|
int w;
|
|
|
|
int fd[2];
|
|
pid_t childpid1;
|
|
pid_t childpid2;
|
|
pipe(fd);
|
|
|
|
int count = 0;
|
|
|
|
while ((nread = getline(&line, &len, stdin)) > 0) {
|
|
lines[count] = (char *) malloc (len);
|
|
strcpy(lines[count], line);
|
|
count++;
|
|
if (count == 1024)
|
|
break;
|
|
}
|
|
|
|
for (int i = 0; i < count; i++) {
|
|
switch (childpid1 = fork()) {
|
|
case -1:
|
|
perror(pname);
|
|
free(line);
|
|
exit(EXIT_FAILURE);
|
|
case 0:
|
|
child1(fd, lines[i]);
|
|
exit(EXIT_SUCCESS);
|
|
break;
|
|
default:
|
|
switch (childpid2 = fork()) {
|
|
case -1:
|
|
perror(pname);
|
|
free(line);
|
|
exit(EXIT_FAILURE);
|
|
case 0:
|
|
child2(fd, lines[i]);
|
|
exit(EXIT_SUCCESS);
|
|
break;
|
|
default:
|
|
do {
|
|
w = waitpid(-1, &status, WUNTRACED | WCONTINUED);
|
|
if (w == -1) {
|
|
perror(pname);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (WIFSIGNALED(status)) {
|
|
printf("Killed by signal %d\n", WTERMSIG(status));
|
|
} else if (WIFSTOPPED(status)) {
|
|
printf("Stopped by signal %d\n", WSTOPSIG(status));
|
|
} else if (WIFCONTINUED(status)) {
|
|
printf("Continued\n");
|
|
}
|
|
} while (!WIFEXITED(status) && !WIFSIGNALED(status));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
free(line);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|