commit e48827f963d8c3cabac5d4daf1fcbe4f509a73c8
Author: phoebos <ben@bvnf.space>
Date: Sat, 26 Feb 2022 18:25:34 +0000
init
Diffstat:
| A | .gitignore | | | 1 | + |
| A | Makefile | | | 9 | +++++++++ |
| A | finger | | | 13 | +++++++++++++ |
| A | nc.c | | | 148 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | spartan | | | 13 | +++++++++++++ |
5 files changed, 184 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+nc
diff --git a/Makefile b/Makefile
@@ -0,0 +1,9 @@
+.POSIX:
+
+XCFLAGS = $(CFLAGS) -Wall -Wextra -Wpedantic -g -Og -D_XOPEN_SOURCE=700
+
+nc: nc.c
+ $(CC) $(XCFLAGS) $(LDFLAGS) nc.c -o $@
+
+clean:
+ rm -f nc
diff --git a/finger b/finger
@@ -0,0 +1,13 @@
+#!/bin/sh -e
+
+[ "$#" -lt 1 ] && {
+ printf "usage: %s user@host...\n" "$0" >&2
+ exit 1
+}
+
+for u; do
+ user="${u%%@*}"
+ host="${u##*@}"
+ printf "[%s@%s]\n" "$user" "$host"
+ printf "%s\r\n" "$user" | ./nc "$host" 79
+done
diff --git a/nc.c b/nc.c
@@ -0,0 +1,148 @@
+/*
+ * This file is in the public domain.
+ * Author: Ben Fuller
+ *
+ * Basic netcat-like utility to create a connection on the specified
+ * address and port, using stdin and stdout.
+ *
+ */
+#include <stdio.h>
+#include <errno.h>
+#include <poll.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <netdb.h>
+
+#define BUF_LEN 1024
+
+void usage(const char *);
+int sock_write(int, char *, size_t);
+int sock_read(int);
+
+int main(int argc, char *argv[]) {
+ int s, sfd = -1;
+ struct addrinfo hints, *result, *rp;
+ if (argc < 3) {
+ usage(argv[0]);
+ }
+
+ memset(&hints, 0, sizeof hints);
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_PASSIVE;
+ hints.ai_protocol = 0;
+
+
+ s = getaddrinfo(argv[1], argv[2], &hints, &result);
+ if (s != 0) {
+ fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
+ return 1;
+ }
+
+ for (rp = result; rp != NULL; rp = rp->ai_next) {
+ sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+ if (sfd == -1)
+ continue;
+
+ if (connect(sfd, rp->ai_addr, rp->ai_addrlen) == 0)
+ break;
+
+ if (close(sfd) == -1) {
+ perror("close");
+ return 1;
+ }
+ }
+
+ freeaddrinfo(result);
+
+ if (rp == NULL) {
+ fprintf(stderr, "connection refused\n");
+ return 1;
+ }
+
+ int pollret;
+ struct pollfd fds[2];
+ fds[0].fd = 0;
+ fds[0].events = POLLIN;
+ fds[1].fd = sfd;
+ fds[1].events = POLLIN | POLLWRBAND;
+
+ char *line = NULL;
+ size_t linelen = 0;
+
+ while (1) {
+ pollret = poll(fds, 2, -1);
+ if (pollret <= 0) {
+ if (errno == EAGAIN)
+ continue;
+ /*if (pollret == 0)
+ fprintf(stderr, "timed out\n");*/
+ perror("poll");
+ free(line);
+ return 1;
+ }
+ if (fds[0].revents & POLLIN) {
+ ssize_t n;
+ if ((n = getline(&line, &linelen, stdin)) == -1) {
+ break;
+ }
+ if (sock_write(sfd, line, (size_t)n) != 0) {
+ free(line);
+ return 1;
+ }
+ }
+ if (fds[1].revents & POLLIN) {
+ int rec = sock_read(sfd);
+ if (rec < 0) {
+ free(line);
+ return 1;
+ } else if (rec == 0) {
+ break;
+ }
+ }
+ fds[0].revents = 0;
+ fds[1].revents = 0;
+ }
+
+ free(line);
+
+ if (close(sfd) == -1) {
+ perror("close");
+ return 1;
+ }
+ return 0;
+}
+
+void usage(const char *argv0){
+ fprintf(stderr, "usage: %s host port\n", argv0);
+ exit(1);
+}
+
+int sock_write(int sfd, char *msg, size_t len){
+ ssize_t ret;
+ ret = send(sfd, msg, len, 0);
+ if (ret != (ssize_t) len) {
+ perror("sock_write");
+ return 1;
+ }
+ return 0;
+}
+
+int sock_read(int sfd){
+ char buff[BUF_LEN];// = {'\0'};
+ memset(&buff, 0, BUF_LEN);
+
+ ssize_t ret = recv(sfd, buff, BUF_LEN, 0);
+
+ if (ret < 0) {
+ perror("sock_read");
+ return -1;
+ }
+ if (ret == 0)
+ return 0;
+ write(1, buff, ret);
+ return 1;
+}
diff --git a/spartan b/spartan
@@ -0,0 +1,13 @@
+#!/bin/sh -e
+
+[ "$#" -lt 1 ] && {
+ printf "usage: %s [spartan://]example.com/foo/bar\n" "$0" >&2
+ exit 1
+}
+
+
+nopref="${1##spartan://}"
+host="${nopref%%/*}"
+path="${nopref#"$host"}"
+path="${path:-/}"
+printf "%s %s 0\r\n" "$host" "${path}" | tee /dev/stderr | ./nc "$host" 300
