cgo

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commit 8a5c0cb3b0d59b9b6c3bb24fccfff837fdbc092d
Author: kieselsteini <s.steinhauer@yahoo.de>
Date:   Thu, 21 Jun 2012 19:21:06 +0200

Initial commit of cgo 0.1.0

Diffstat:
ACOPYING | 674+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
AMakefile | 20++++++++++++++++++++
AREADME.md | 85+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Acgo.c | 507+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 1286 insertions(+), 0 deletions(-)

diff --git a/COPYING b/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. 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Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +<http://www.gnu.org/licenses/>. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +<http://www.gnu.org/philosophy/why-not-lgpl.html>. diff --git a/Makefile b/Makefile @@ -0,0 +1,20 @@ +# see COPYING for copyright and license details +PREFIX = /usr/local +# to compile a very very small client using dietlibc +#CC = diet -Os gcc -Wall +CC = cc -O2 -Wall +OBJ = cgo.o +BIN = cgo + +default: $(OBJ) + $(CC) -o $(BIN) $(OBJ) + +clean: + rm -f $(OBJ) $(BIN) + +install: + @cp -f $(BIN) $(DESTDIR)$(PREFIX)/bin + +uninstall: + @rm -f $(DESTDIR)$(PREFIX)/bin/$(BIN) + diff --git a/README.md b/README.md @@ -0,0 +1,85 @@ +cgo - a terminal gopher client +============================== + +Summary +------- + +cgo is a UNIX/Linux terminal based gopher client. It has no other +dependencies than libc and some syscalls. It should run on every +VT100 compatible terminal. To show media like images, music or +webpages it relies on external programs you can specify. + + +What does cgo mean? +------------------- + +cgo means more or less, the "c go"pher client. And c could +stand for C (the programming language), colorful or console. +You may choose one of the meanings or propose other :) +(but please not crappy!) + + +How to install +-------------- + +Grab the source code, open cgo.c and adjust the external programs +to your needs. You can also change the default gopherhole where +cgo connects on startup without any parameters (e.g. you can +tell cgo to connect directly to some Veronica search engine). +And if you don't like the default colors, you're able to change +them also here. +If you're done with changing the defaults, just "make" the +final binary. + + +Parameters +---------- + +In case you omit all parameters cgo will show you the default +gopherhole specified in the source file. + + * -h [host] use this host to connect + * -p [port] use this port to connect + * -s [selector] use this selector on startup + * -H show usage + * -v print version + + +Usage +----- + + When "surfing" in the gopherspace cgo only present you + directory listings. Every selector is preceeded with two + ascii chars. By typing in both chars cgo will jump to + the given selector. Every time you jump to another + directory listing cgo generates a history entry (like every + browser). To show other media cgo uses external programs + to present it (e.g. less, display, mplayer, firefox). + Following commands are understood by cgo: + + * ? help + * < jump back in history + * * reload directory + * [xx] show / jump to selector + * .[xx] download selector + +[xx] stands for the two colored letters in front of selectors. + + +Todo +---- + + * write a man page or something like that + * configuration files (editing code is not that easy for everyone) + + +Bugs +---- + + * none I'm aware of :) + + +Feel free to use this small gopher client. I hope you'll +find it as useful as I do. Send me comments or patches it you +like. I would appreciate it. + diff --git a/cgo.c b/cgo.c @@ -0,0 +1,507 @@ +/* cgo - a simple terminal based gopher client + * Copyright (C) 2012 Sebastian Steinhauer <s.steinhauer@yahoo.de> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/wait.h> +#include <sys/socket.h> +#include <netdb.h> +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +/* some "configuration" */ +#define DEFAULT_HOST "gopher.floodgap.com" +#define DEFAULT_PORT "70" +#define DEFAULT_SELECTOR "/" +#define CMD_TEXT "less" +#define CMD_IMAGE "display" +#define CMD_BROWSER "firefox" +#define CMD_PLAYER "mplayer" +#define COLOR_PROMT "1;34" +#define COLOR_SELECTOR "1;32" + +/* some internal defines */ +#define KEY_RANGE ('z' - 'a') + +typedef struct link_s link_t; +struct link_s { + link_t *next; + char which; + short key; + char *host; + char *port; + char *selector; +}; + +char tmpfilename[256]; +link_t *links = NULL; +link_t *history = NULL; +int link_key; +char current_host[512], current_port[64], current_selector[1024]; + + +void usage() +{ + fputs("usage: cgo [-h host] [-p port] [-s selector] [-v] [-H]\n", + stderr); + exit(EXIT_SUCCESS); +} + +void banner(FILE *f) +{ + fputs("cgo 0.1.0 Copyright (C) 2012 Sebastian Steinhauer\n", f); +} + +int dial(const char *host, const char *port, const char *selector) +{ + struct addrinfo hints; + struct addrinfo *res, *r; + int srv = -1, l; + char request[512]; + + memset(&hints, 0, sizeof(hints)); + hints.ai_family = AF_UNSPEC; + hints.ai_socktype = SOCK_STREAM; + if (getaddrinfo(host, port, &hints, &res) != 0) { + fprintf(stderr, "error: cannot resolve hostname '%s:%s': %s\n", + host, port, strerror(errno)); + return -1; + } + for (r = res; r; r = r->ai_next) { + srv = socket(r->ai_family, r->ai_socktype, r->ai_protocol); + if (srv == -1) + continue; + if (connect(srv, r->ai_addr, r->ai_addrlen) == 0) + break; + close(srv); + } + freeaddrinfo(res); + if (! r) { + fprintf(stderr, "error: cannot connect to host '%s:%s'\n", + host, port); + return -1; + } + snprintf(request, sizeof(request), "%s\r\n", selector); + l = strlen(request); + if (write(srv, request, l) != l) { + fprintf(stderr, "error: cannot complete request\n"); + close(srv); + return -1; + } + return srv; +} + +int read_line(int fd, char *buf, size_t buf_len) +{ + size_t i = 0; + char c = 0; + + do { + if (read(fd, &c, sizeof(char)) != sizeof(char)) + return 0; + if (c != '\r') + buf[i++] = c; + } while (c != '\n' && i < buf_len); + buf[i - 1] = '\0'; + return 1; +} + +int download_file(const char *host, const char *port, + const char *selector, int fd) +{ + int srvfd, len; + char buffer[1024]; + + printf("downloading [%s]...\r", selector); + srvfd = dial(host, port, selector); + if (srvfd == -1) { + printf("\033[2Kerror: downloading [%s] failed\n", selector); + close(fd); + return 0; + } + while ((len = read(srvfd, buffer, sizeof(buffer))) > 0) { + write(fd, buffer, len); + } + close(fd); + close(srvfd); + printf("\033[2Kdownloading [%s] complete\n", selector); + return 1; +} + +int download_temp(const char *host, const char *port, const char *selector) +{ + int tmpfd; + + strcpy(tmpfilename, "/tmp/cgoXXXXXX"); + tmpfd = mkstemp(tmpfilename); + if (tmpfd == -1) { + fputs("error: unable to create tmp file\n", stderr); + return 0; + } + if (! download_file(host, port, selector, tmpfd)) { + unlink(tmpfilename); + return 0; + } + return 1; +} + +void add_link(char which, const char *name, + const char *host, const char *port, const char *selector) +{ + link_t *link; + char a = 0, b = 0; + + if (! host || ! port || ! selector) + return; /* ignore incomplete selectors */ + link = calloc(1, sizeof(link_t)); + link->which = which; + link->key = link_key; + link->host = strdup(host); + link->port = strdup(port); + link->selector = strdup(selector); + if (! links) + link->next = NULL; + else + link->next = links; + links = link; + + a = 'a' + (link_key / KEY_RANGE); + b = 'a' + (link_key % KEY_RANGE); + link_key++; + + printf("\033[%sm%c%c\033[0m \033[1m%s\033[0m\n", + COLOR_SELECTOR, a, b, name); +} + +void clear_links() +{ + link_t *link, *next; + + for (link = links; link; ) { + next = link->next; + free(link->host); + free(link->port); + free(link->selector); + free(link); + link = next; + } + links = NULL; + link_key = 0; +} + +void add_history() +{ + link_t *link; + + link = calloc(1, sizeof(link_t)); + link->host = strdup(current_host); + link->port = strdup(current_port); + link->selector = strdup(current_selector); + link->which = 0; /* not needed for history...just clear them */ + link->key = 0; + if (! history) + link->next = NULL; + else + link->next = history; + history = link; +} + +void view_directory(const char *host, const char *port, + const char *selector, int make_current) +{ + int srvfd, i; + char line[1024]; + char *lp, *last, *fields[4]; + + srvfd = dial(host, port, selector); + if (srvfd != -1) { /* only adapt current prompt when successful */ + /* make history entry */ + if (make_current) + add_history(); + /* don't overwrite the current_* things... */ + if (host != current_host) + snprintf(current_host, sizeof(current_host), "%s", host); + if (port != current_port) + snprintf(current_port, sizeof(current_port), "%s", port); + if (selector != current_selector) + snprintf(current_selector, sizeof(current_selector), + "%s", selector); + } + clear_links(); /* clear links *AFTER* dialing out!! */ + if (srvfd == -1) + return; /* quit if not successful */ + while (read_line(srvfd, line, sizeof(line))) { + /* tokenize */ + for (i = 0; i < 4; i++) + fields[i] = NULL; + last = &line[1]; + for (lp = last, i = 0; i < 4; lp++) { + if (*lp == '\t' || *lp == '\0') { + fields[i] = last; + last = lp + 1; + if (*lp == '\0') + break; + *lp = '\0'; + i++; + } + } + /* determine listing type */ + switch (line[0]) { + case 'i': + printf(" %s\n", fields[0]); + break; + case '.': /* some gopher servers use this */ + puts(""); + break; + case '0': + case '1': + case '5': + case '7': + case '9': + case 'g': + case 'I': + case 'h': + case 's': + add_link(line[0], fields[0], fields[2], fields[3], fields[1]); + break; + default: + printf("miss [%c]: %s\n", line[0], fields[0]); + break; + } + } + close(srvfd); +} + +void view_file(const char *cmd, const char *host, + const char *port, const char *selector) +{ + pid_t pid; + int status; + + if (! download_temp(host, port, selector)) + return; + printf("executing: %s %s\n", cmd, tmpfilename); + pid = fork(); + if (pid == 0) { + if (execlp(cmd, cmd, tmpfilename, NULL) == -1) + puts("error: execlp() failed!"); + } else if (pid == -1) { + puts("error: fork() failed"); + } + sleep(1); /* to wait for browsers etc. that return immediatly */ + waitpid(pid, &status, 0); + unlink(tmpfilename); +} + +void view_download(const char *host, const char *port, const char *selector) +{ + int fd; + char filename[1024], line[1024]; + + snprintf(filename, sizeof(filename), "%s", strrchr(selector, '/') + 1); + printf("enter filename for download [%s]: ", filename); + fflush(stdout); + if (! read_line(0, line, sizeof(line))) { + puts("download aborted"); + return; + } + if (strlen(line) > 0) + strcpy(filename, line); + fd = open(filename, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR); + if (fd == -1) { + printf("error: unable to create file [%s]: %s\n", + filename, strerror(errno)); + return; + } + if (! download_file(host, port, selector, fd)) { + printf("error: unable to download [%s]\n", selector); + unlink(filename); + return; + } +} + +void view_search(const char *host, const char *port, const char *selector) +{ + char search_selector[1024]; + char line[1024]; + + printf("enter search string: "); + fflush(stdout); + if (! read_line(0, line, sizeof(line))) { + puts("search aborted"); + return; + } + snprintf(search_selector, sizeof(search_selector), "%s\t%s", + selector, line); + view_directory(host, port, search_selector, 1); +} + +void pop_history() +{ + link_t *next; + + if (! history) { + puts("(empty history)"); + return; + } + /* reload page from history (and don't count as history) */ + view_directory(history->host, history->port, history->selector, 0); + /* history is history... :) */ + next = history->next; + free(history->host); + free(history->port); + free(history->selector); + free(history); + history = next; +} + +int make_key(char c1, char c2) +{ + if (! c1 || ! c2) + return -1; + return ((c1 - 'a') * KEY_RANGE) + (c2 - 'a'); +} + +int follow_link(int key) +{ + link_t *link; + + for (link = links; link; link = link->next) { + if (link->key != key) + continue; + switch (link->which) { + case '0': + view_file(CMD_TEXT, link->host, link->port, link->selector); + break; + case '1': + view_directory(link->host, link->port, link->selector, 1); + break; + case '7': + view_search(link->host, link->port, link->selector); + break; + case '5': + case '9': + view_download(link->host, link->port, link->selector); + break; + case 'g': + case 'I': + view_file(CMD_IMAGE, link->host, link->port, link->selector); + break; + case 'h': + view_file(CMD_BROWSER, link->host, link->port, + link->selector); + break; + case 's': + view_file(CMD_PLAYER, link->host, link->port, link->selector); + break; + default: + printf("mssing handler [%c]\n", link->which); + break; + } + return 1; /* return the array is broken after view! */ + } + return 0; +} + +void download_link(int key) +{ + link_t *link; + + for (link = links; link; link = link->next) { + if (link->key != key) + continue; + view_download(link->host, link->port, link->selector); + return; + } + puts("link not found"); +} + +int main(int argc, char *argv[]) +{ + int i; + char line[1024]; + char *host, *port, *selector; + + /* copy defaults */ + host = DEFAULT_HOST; + port = DEFAULT_PORT; + selector = DEFAULT_SELECTOR; + for (i = 1; i < argc; i++) { + if (argv[i][0] == '-') switch(argv[i][1]) { + case 'H': + usage(); + break; + case 'v': + banner(stderr); + exit(EXIT_FAILURE); + case 'h': + if (++i >= argc) usage(); + host = argv[i]; + break; + case 'p': + if (++i >= argc) usage(); + port = argv[i]; + break; + case 's': + if (++i >= argc) usage(); + selector = argv[i]; + break; + default: + usage(); + } + } + + banner(stdout); + view_directory(host, port, selector, 0); + for (;;) { /* main loop */ + printf("\033[%sm%s:%s%s\033[0m ", COLOR_PROMT, + current_host, current_port, current_selector); + fflush(stdout); /* to display the prompt */ + if (! read_line(0, line, sizeof(line))) { + puts("QUIT"); + return EXIT_SUCCESS; + } + switch (line[0]) { + case '?': + puts( + "? - help\n" + "* - reload directory\n" + "< - go back in history\n" + ".LINK - download the given link\n" + "C^d - quit"); + break; + case '<': + pop_history(); + break; + case '*': + view_directory(current_host, current_port, + current_selector, 0); + break; + case '.': + download_link(make_key(line[1], line[2])); + break; + default: + follow_link(make_key(line[0], line[1])); + break; + } + } + return EXIT_SUCCESS; /* never get's here but stops cc complaining */ +} +