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gplaces.c
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gplaces.c
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/*
================================================================================
gplaces - a simple terminal Gemini client
Copyright (C) 2022 - 2024 Dima Krasner
Copyright (C) 2019 Sebastian Steinhauer
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 <https://www.gnu.org/licenses/>.
================================================================================
*/
/*============================================================================*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <wchar.h>
#include <locale.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/stat.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <regex.h>
#include <sys/mman.h>
#include <dirent.h>
#include "queue.h"
#include <openssl/ssl.h>
#include <openssl/bio.h>
#include <openssl/x509.h>
#include <openssl/ec.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <curl/curl.h>
#ifdef GPLACES_USE_LIBIDN2
#include <idn2.h>
#elif defined(GPLACES_USE_LIBIDN)
#include <idna.h>
#endif
#ifdef GPLACES_USE_LIBMAGIC
#include <magic.h>
#endif
#include "bestline/bestline.h"
/*============================================================================*/
typedef struct Selector Selector;
typedef SIMPLEQ_HEAD(, Selector) SelectorList;
typedef struct URL URL;
typedef struct Page Page;
typedef TAILQ_HEAD(PageList, Page) PageList;
typedef void (*Parser)(char *, int *pre, Selector **, SelectorList *);
typedef struct Protocol {
const char *scheme, *port;
int (*read)(void *, void *, int);
int (*peek)(void *, void *, int);
int (*error)(const URL *, void *, int);
void (*close)(void *);
void *(*download)(const Selector *, URL *, char **mime, Parser *, unsigned int redirs, int ask);
int (*set_input)(URL *url, const char *input);
} Protocol;
struct Selector {
SIMPLEQ_ENTRY(Selector) next;
int level;
#if defined(GPLACES_WITH_SPARTAN)
char prompt;
#endif
char type, *repr, *rawurl;
CURLU *cu;
};
struct URL {
char *scheme, *host, *port, *path, *url;
CURLU *cu;
const Protocol *proto;
};
struct Page {
char prompt[256];
SelectorList menu;
time_t fetched;
char *url;
TAILQ_ENTRY(Page) next;
};
typedef struct Variable {
LIST_ENTRY(Variable) next;
char *name, *data;
} Variable;
typedef LIST_HEAD(, Variable) VariableList;
typedef struct Command {
const char *name;
void (*func)(char *line);
} Command;
/*============================================================================*/
const Protocol gemini;
#ifdef GPLACES_WITH_TITAN
const Protocol titan;
#endif
#ifdef GPLACES_WITH_GOPHERS
const Protocol gophers;
#endif
#ifdef GPLACES_WITH_GOPHER
const Protocol gopher;
#endif
#ifdef GPLACES_WITH_SPARTAN
const Protocol spartan;
#endif
#ifdef GPLACES_WITH_FINGER
const Protocol finger;
#endif
#ifdef GPLACES_WITH_GUPPY
const Protocol guppy;
#endif
/*============================================================================*/
static VariableList variables = LIST_HEAD_INITIALIZER(variables);
static SelectorList subscriptions = SIMPLEQ_HEAD_INITIALIZER(subscriptions);
static PageList history = TAILQ_HEAD_INITIALIZER(history);
static const Selector feed_sel = {.rawurl = "gplaces:https://sub/"};
SelectorList blank = SIMPLEQ_HEAD_INITIALIZER(blank);
#define currentmenu TAILQ_EMPTY(&history) ? blank : TAILQ_FIRST(&history)->menu
#define currenturl TAILQ_EMPTY(&history) ? NULL : TAILQ_FIRST(&history)->url
static int depth;
static int interactive;
static int color;
static int inshell;
/*============================================================================*/
__attribute__((format(printf, 2, 3)))
static void error(int fatal, const char *fmt, ...) {
va_list va;
if (color) fwrite("\33[31m\n", 1, 6, stderr);
else fputc('\n', stderr);
va_start(va, fmt);
vfprintf(stderr, fmt, va);
va_end(va);
if (color) fwrite("\33[0m\n", 1, 5, stderr);
else fputc('\n', stderr);
if (fatal) exit(EXIT_FAILURE);
}
/*============================================================================*/
static char *str_copy(const char *str) {
char *new;
if ((new = strdup(str)) == NULL) error(1, "cannot allocate new string");
return new;
}
/*============================================================================*/
static void free_variables(VariableList *vars) {
Variable *var, *tmp;
LIST_FOREACH_SAFE(var, vars, next, tmp) {
free(var->name);
free(var->data);
free(var);
}
}
static char *set_var(VariableList *list, const char *name, const char *value) {
Variable *var;
if (name == NULL) return NULL;
LIST_FOREACH(var, list, next) {
if (!strcasecmp(var->name, name)) break;
}
if (value) {
if (var == NULL) {
if ((var = malloc(sizeof(Variable))) == NULL) error(1, "cannot allocate new variable");
var->name = str_copy((char*)name);
var->data = str_copy(value);
LIST_INSERT_HEAD(list, var, next);
} else {
free(var->data);
var->data = str_copy(value);
}
}
return var ? var->data : NULL;
}
static int get_var_integer(const char *name, int def) {
int value;
char *data = set_var(&variables, name, NULL);
if (data == NULL || sscanf(data, "%d", &value) != 1) return def;
return value;
}
/*============================================================================*/
static void *map_file(const char *name, int *fd, size_t *size) {
static char path[1024];
struct stat stbuf;
const char *home;
void *p;
if ((home = getenv("XDG_DATA_HOME")) != NULL) snprintf(path, sizeof(path), "%s/gplaces_%s", home, name);
else if ((home = getenv("HOME")) != NULL) snprintf(path, sizeof(path), "%s/.gplaces_%s", home, name);
else return NULL;
if ((*fd = open(path, O_RDWR | O_CREAT | O_APPEND, 0600)) == -1) return NULL;
if (fstat(*fd, &stbuf) == -1) { close(*fd); return NULL; }
if ((*size = (size_t)stbuf.st_size) == 0) return NULL;
if ((p = mmap(NULL, stbuf.st_size % SIZE_MAX, PROT_READ | PROT_WRITE, MAP_SHARED, *fd, 0)) == MAP_FAILED) { close(*fd); return NULL; }
return p;
}
__attribute__((format(printf, 2, 3)))
static int append_line(int fd, const char *fmt, ...) {
va_list va;
FILE *fp;
int ret;
if ((fp = fdopen(fd, "a")) == NULL) return 0;
va_start(va, fmt);
ret = vfprintf(fp, fmt, va) > 0;
va_end(va);
fclose(fp);
return ret;
}
/*============================================================================*/
static Selector *new_selector(const char type) {
Selector *new = calloc(1, sizeof(Selector));
if (new == NULL) error(1, "cannot allocate new selector");
new->type = type;
return new;
}
static void free_selector(Selector *sel) {
free(sel->repr);
free(sel->rawurl);
free(sel);
}
static void free_url(URL *url) {
curl_free(url->scheme);
curl_free(url->host);
if (url->proto != NULL && url->port != url->proto->port) curl_free(url->port);
curl_free(url->path);
curl_free(url->url);
if (url->cu != NULL) curl_url_cleanup(url->cu);
}
static void free_selectors(SelectorList *list) {
Selector *sel, *tmp;
SIMPLEQ_FOREACH_SAFE(sel, list, next, tmp) free_selector(sel);
}
static int set_query(URL *url, const char *input) {
char *query, *tmp;
if ((query = curl_easy_escape(NULL, input, 0)) == NULL) return 0;
if (curl_url_set(url->cu, CURLUPART_QUERY, query, CURLU_NON_SUPPORT_SCHEME) != CURLUE_OK || curl_url_get(url->cu, CURLUPART_URL, &tmp, 0) != CURLUE_OK) { curl_free(query); return 0; }
curl_free(url->url); url->url = tmp;
curl_free(query);
return 1;
}
#if defined(GPLACES_WITH_TITAN) || defined(GPLACES_WITH_GOPHER) || defined(GPLACES_WITH_GOPHERS) || defined(GPLACSE_WITH_FINGER)
static int set_fragment(URL *url, const char *input) {
char *tmp;
if (curl_url_set(url->cu, CURLUPART_FRAGMENT, input, CURLU_NON_SUPPORT_SCHEME) != CURLUE_OK || curl_url_get(url->cu, CURLUPART_URL, &tmp, 0) != CURLUE_OK) return 0;
curl_free(url->url); url->url = tmp;
return 1;
}
#endif
static int parse_url(URL *url, const char *rawurl, const char *from, const char *input) {
static char buffer[1024];
#if defined(GPLACES_USE_LIBIDN2) || defined(GPLACES_USE_LIBIDN)
char *host;
#endif
int file;
if ((url->cu == NULL && (url->cu = curl_url()) == NULL) || (from != NULL && curl_url_set(url->cu, CURLUPART_URL, from, CURLU_NON_SUPPORT_SCHEME) != CURLUE_OK)) return 0;
/* TODO: why does curl_url_set() return CURLE_OUT_OF_MEMORY if the scheme is missing, but only inside the Flatpak sandbox? */
if (curl_url_set(url->cu, CURLUPART_URL, rawurl, CURLU_NON_SUPPORT_SCHEME) != CURLUE_OK) {
#if defined(GPLACES_WITH_GOPHER) && defined(CURLU_ALLOW_SPACE)
if (strncmp(rawurl, "gopher:https://", 9) == 0) {
if (curl_url_set(url->cu, CURLUPART_URL, rawurl, CURLU_NON_SUPPORT_SCHEME | CURLU_ALLOW_SPACE) == CURLUE_OK) goto valid;
return 0;
}
#endif
#if defined(GPLACES_WITH_GOPHERS) && defined(CURLU_ALLOW_SPACE)
if (strncmp(rawurl, "gophers:https://", 10) == 0) {
if (curl_url_set(url->cu, CURLUPART_URL, rawurl, CURLU_NON_SUPPORT_SCHEME | CURLU_ALLOW_SPACE) == CURLUE_OK) goto valid;
return 0;
}
#endif
snprintf(buffer, sizeof(buffer), "gemini:https://%s", rawurl);
if (curl_url_set(url->cu, CURLUPART_URL, buffer, CURLU_NON_SUPPORT_SCHEME) != CURLUE_OK) return 0;
}
#if (defined(GPLACES_WITH_GOPHER) || defined(GPLACES_WITH_GOPHERS)) && defined(CURLU_ALLOW_SPACE)
valid:
#endif
if (curl_url_get(url->cu, CURLUPART_SCHEME, &url->scheme, 0) != CURLUE_OK) return 0;
if (strcmp(url->scheme, "gemini") == 0) {
url->proto = &gemini;
#ifdef GPLACES_WITH_TITAN
} else if (strcmp(url->scheme, "titan") == 0) {
url->proto = &titan;
#endif
#ifdef GPLACES_WITH_GOPHER
} else if (strcmp(url->scheme, "gopher") == 0) {
url->proto = &gopher;
#endif
#ifdef GPLACES_WITH_GOPHERS
} else if (strcmp(url->scheme, "gophers") == 0) {
url->proto = &gophers;
#endif
#ifdef GPLACES_WITH_SPARTAN
} else if (strcmp(url->scheme, "spartan") == 0) {
url->proto = &spartan;
#endif
#ifdef GPLACES_WITH_FINGER
} else if (strcmp(url->scheme, "finger") == 0) {
url->proto = &finger;
#endif
#ifdef GPLACES_WITH_GUPPY
} else if (strcmp(url->scheme, "guppy") == 0) {
url->proto = &guppy;
#endif
}
if (input != NULL && input[0] != '\0' && !url->proto->set_input(url, input)) return 0;
else if ((input == NULL || input[0] == '\0') && curl_url_get(url->cu, CURLUPART_URL, &url->url, 0) != CURLUE_OK) return 0;
if (!(file = (strcmp(url->scheme, "file")) == 0) && curl_url_get(url->cu, CURLUPART_HOST, &url->host, 0) != CURLUE_OK) return 0;
#if defined(GPLACES_USE_LIBIDN2) || defined(GPLACES_USE_LIBIDN)
#ifdef GPLACES_USE_LIBIDN2
if (!file && (idn2_to_ascii_8z(url->host, &host, IDN2_NONTRANSITIONAL) == IDN2_OK || idn2_to_ascii_8z(url->host, &host, IDN2_TRANSITIONAL) == IDN2_OK)) {
#elif defined(GPLACES_USE_LIBIDN)
if (!file && idna_to_ascii_8z(url->host, &host, 0) == IDNA_SUCCESS) {
#endif
if (curl_url_set(url->cu, CURLUPART_HOST, host, 0) != CURLUE_OK) { free(host); return 0; }
free(host);
curl_free(url->host); url->host = NULL;
if (curl_url_get(url->cu, CURLUPART_HOST, &url->host, 0) != CURLUE_OK) return 0;
}
#endif
if (curl_url_get(url->cu, CURLUPART_PATH, &url->path, 0) != CURLUE_OK) return 0;
if (file) return 1;
switch (curl_url_get(url->cu, CURLUPART_PORT, &url->port, 0)) {
case CURLUE_OK: break;
case CURLUE_NO_PORT:
if (url->proto != NULL) url->port = str_copy(url->proto->port);
break;
/* fall through */
default: return 0;
}
return 1;
}
static int redirect(URL *url, const char *to, size_t len, int ask) {
URL tmp = {0};
char *rawurl;
if ((rawurl = len > 0 ? strndup(to, len) : strdup(to)) == NULL) error(1, "cannot allocate new string");
if (!parse_url(&tmp, rawurl, url->url, NULL)) { free(rawurl); return 40; }
free(rawurl);
free_url(url);
memcpy(url, &tmp, sizeof(URL));
fprintf(stderr, "redirected to `%s`\n", url->url);
if (ask) bestlineHistoryAdd(url->url);
return 31;
}
static int perm_redirect(URL *url, const char *to, int ask) {
size_t size = 1, len;
const char *p, *start, *end;
int fd, ret = 20, found = 0;
len = strlen(url->url);
if ((p = map_file("redirs", &fd, &size)) == NULL && size > 0) return 40;
else if (p != NULL) {
for (end = p; !found && (start = memmem(end, size - (end - p), url->url, len)) != NULL; end = start + len + 1) {
if (!(found = ((start == p || *(start - 1) == '\n') && size - (start - p) >= len + 2 && start[len] == ' ' && start[len + 1] != '\n'))) continue;
ret = redirect(url, &start[len + 1], strcspn(&start[len + 1], " \n"), ask);
}
munmap((void *)p, size);
}
if (to != NULL && !found) ret = append_line(fd, "%s %s\n", url->url, to) ? redirect(url, to, -1, ask) : 40;
close(fd);
return ret;
}
static const Selector *find_selector(const SelectorList list, int index) {
const Selector *sel;
long i = 0;
SIMPLEQ_FOREACH(sel, &list, next) if (sel->type == 'l' && ++i == index) return sel;
return NULL;
}
static int copy_url(Selector *sel, const char *url) {
if (url == NULL || *url == '\0') return 0;
sel->rawurl = str_copy(url);
return 1;
}
/*============================================================================*/
static void free_page(Page *page) {
free_selectors(&page->menu);
free(page->url);
free(page);
}
static void free_history(PageList *pages) {
Page *page, *tmp;
TAILQ_FOREACH_SAFE(page, pages, next, tmp) free_page(page);
}
static void history_pop(void) {
Page *page = TAILQ_LAST(&history, PageList);
TAILQ_REMOVE(&history, page, next);
free_selectors(&page->menu);
free(page->url);
free(page);
}
static void history_push(const char *url, SelectorList menu, const char *fmt, ...) {
va_list va;
Page *page;
int max;
if ((max = get_var_integer("HISTSIZE", 10)) < 1) max = 1;
if ((page = malloc(sizeof(Page))) == NULL) error(1, "cannot allocate new page");
page->url = url == NULL ? NULL : str_copy(url);
va_start(va, fmt);
vsnprintf(page->prompt, sizeof(page->prompt), fmt, va);
va_end(va);
page->menu = menu;
if (time(&page->fetched) == -1) page->fetched = 0;
for (; depth > 0 && depth >= max; --depth) history_pop();
TAILQ_INSERT_HEAD(&history, page, next);
++depth;
}
static Page *history_lookup(const char *url) {
Page *page, *tmp;
TAILQ_FOREACH_SAFE(page, &history, next, tmp) {
if (page->url == NULL || strcmp(page->url, url) != 0) continue;
TAILQ_REMOVE(&history, page, next);
TAILQ_INSERT_HEAD(&history, page, next);
return page;
}
return NULL;
}
/*============================================================================*/
static int socket_connect(const URL *url, int socktype) {
struct addrinfo hints = {.ai_family = AF_UNSPEC, .ai_socktype = socktype}, *result, *it;
struct timeval tv = {0};
int timeout, err, fd = -1;
if ((timeout = get_var_integer("TIMEOUT", 15)) < 1) timeout = 15;
tv.tv_sec = timeout;
if ((err = getaddrinfo(url->host, url->port, &hints, &result)) != 0) {
error(0, "cannot resolve hostname `%s`: %s", url->host, gai_strerror(err));
return -1;
}
for (it = result; it && err != EINTR; it = it->ai_next) {
if ((fd = socket(it->ai_family, it->ai_socktype, it->ai_protocol)) == -1) { err = errno; continue; }
if (fcntl(fd, F_SETFD, FD_CLOEXEC) == 0 && setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) == 0 && setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) == 0 && connect(fd, it->ai_addr, it->ai_addrlen) == 0) break;
err = errno;
close(fd); fd = -1;
}
freeaddrinfo(result);
if (fd == -1 && err == EINPROGRESS) error(0, "cannot connect to `%s`:`%s`: cancelled", url->host, url->port);
else if (fd == -1 && err != 0) error(0, "cannot connect to `%s`:`%s`: %s", url->host, url->port, strerror(err));
return fd;
}
static int tcp_connect(const URL *url) {
return socket_connect(url, SOCK_STREAM);
}
/*============================================================================*/
static void parse_plaintext_line(char *line, int *pre, Selector **sel, SelectorList *list) {
(void)pre;
(void)index;
*sel = new_selector('`');
(*sel)->repr = str_copy(line);
SIMPLEQ_INSERT_TAIL(list, *sel, next);
}
static void parse_gemtext_line(char *line, int *pre, Selector **sel, SelectorList *list) {
char *url;
int level;
*sel = NULL;
if (strncmp(line, "```", 3) == 0) {
*pre = !*pre;
return;
}
if (*pre) {
*sel = new_selector('`');
(*sel)->repr = str_copy(line);
} else if (line[0] == '=' && line[1] == '>') {
*sel = new_selector('l');
url = line + 2 + strspn(line + 2, " \t");
line = url + strcspn(url, " \t");
if (*line != '\0') {
*line = '\0';
line += 1 + strspn(line + 1, " \t");
}
if (!copy_url(*sel, url)) { free_selector(*sel); *sel = NULL; return; }
if (*line) (*sel)->repr = str_copy(line);
else (*sel)->repr = str_copy(url);
} else if (line[0] == '#' && (level = 1 + strspn(&line[1], "#")) <= 3) {
*sel = new_selector('#');
(*sel)->repr = str_copy(line + level + strspn(line + level, " \t"));
(*sel)->level = level;
} else if (*line == '>' || (line[0] == '*' && line[1] == ' ')) {
*sel = new_selector(*line);
(*sel)->repr = str_copy(line + 1 + strspn(line + 1, " \t"));
} else {
*sel = new_selector('i');
(*sel)->repr = str_copy(line);
}
SIMPLEQ_INSERT_TAIL(list, *sel, next);
}
static SelectorList parse_file(FILE *fp, const Parser parser) {
static char buffer[LINE_MAX];
char *line;
SelectorList list = SIMPLEQ_HEAD_INITIALIZER(list);
size_t len;
Selector *sel;
int pre = 0, start = 1;
for (sel = NULL; (line = fgets(buffer, sizeof(buffer), fp)) != NULL; sel = NULL, start = 0) {
if ((len = strlen(line)) > 1 && buffer[len - 2] == '\r') buffer[len - 2] = '\0';
else if (line[len - 1] == '\n') line[len - 1] = '\0';
parser((start && strncmp(line, "\xef\xbb\xbf", 3) == 0) ? line + 3: line, &pre, &sel, &list);
}
return list;
}
/*============================================================================*/
static char *next_token(char **str) {
char *begin;
if (*str == NULL) return NULL;
*str += strspn(*str, " \v\t");
switch (**str) {
case '\0': case '#': return NULL;
case '"': ++*str; return strtok_r(*str, "\"", str);
default:
begin = *str;
*str += strcspn(*str, " \v\t");
if (**str != '\0') { **str = '\0'; ++*str; }
return begin;
}
}
static int get_terminal_width() {
struct winsize wz;
ioctl(STDOUT_FILENO, TIOCGWINSZ, &wz);
return wz.ws_col > 20 ? wz.ws_col : 20;
}
/*============================================================================*/
static const char *find_mime_handler(const char *mime) {
Variable *var;
const char *handler = NULL;
size_t length, longest = 0;
LIST_FOREACH(var, &variables, next) {
if ((length = strlen(var->name)) > longest && !strncasecmp(mime, var->name, length)) {
longest = length;
handler = var->data;
}
}
if (!handler) fprintf(stderr, "no handler for `%s`\n", mime);
return handler;
}
static void reap(const char *command, pid_t pid, int silent) {
pid_t ret;
int status;
while ((ret = waitpid(pid, &status, 0)) < 0 && errno == EINTR);
if (!silent && ret == pid && WIFEXITED(status)) fprintf(stderr, "`%s` has exited with exit status %d\n", command, WEXITSTATUS(status));
else if (ret == pid && !WIFEXITED(status)) fprintf(stderr, "`%s` has exited abnormally\n", command);
}
static pid_t start_handler(const char *handler, const char *filename, char *command, size_t length, const Selector *sel, const URL *url, int stdin) {
static char buffer[sizeof("/proc/self/fd/2147483647")];
size_t i;
pid_t pid;
if (stdin != -1) {
sprintf(buffer, "/proc/self/fd/%d", stdin);
filename = buffer;
}
for (i = 0; *handler && i < length - 1; ) {
if (handler[0] == '%' && handler[1] != '\0') {
const char *append = "";
switch (handler[1]) {
case '%': append = "%"; break;
case 's': append = url->scheme; break;
case 'h': append = url->host; break;
case 'p': append = url->port; break;
case 'P': append = url->path; break;
case 'r': append = sel->repr; break;
case 'u': append = url->url; break;
case 'f': append = filename; break;
}
handler += 2;
while (*append && i < length - 1) command[i++] = *append++;
} else command[i++] = *handler++;
}
command[i] = '\0';
if ((pid = fork()) == 0) {
#ifdef GPLACES_USE_FLATPAK_SPAWN
if (stdin == -1) execl("/usr/bin/flatpak-spawn", "flatpak-spawn", "--host", "--", "sh", "-c", command, (char *)NULL);
else {
sprintf(buffer, "--forward-fd=%d", stdin);
execl("/usr/bin/flatpak-spawn", "flatpak-spawn", "--host", buffer, "--", "sh", "-c", command, (char *)NULL);
}
#else
execl("/bin/sh", "sh", "-c", command, (char *)NULL);
#endif
exit(EXIT_FAILURE);
} else if (pid < 0) error(0, "could not execute `%s`", command);
return pid;
}
static void execute_handler(const char *handler, const char *filename, const Selector *sel, const URL *url) {
static char command[1024];
pid_t pid;
if ((pid = start_handler(handler, filename, command, sizeof(command), sel, url, -1)) > 0) reap(command, pid, 0);
}
/*============================================================================*/
static int ndigits(int n) {
int digits = 0;
for ( ; n > 0; n /= 10, ++digits);
return digits;
}
static void print_line(FILE *fp, const Selector *sel, const regex_t *filter, int width, int *links) {
mbstate_t ps;
size_t size, mbs;
wchar_t wchar;
const char *p;
int w, wchars, out, extra, i = 0;
if (sel->type == 'l') ++*links;
if (filter && regexec(filter, sel->repr, 0, NULL, 0) != 0 && (sel->rawurl == NULL || regexec(filter, sel->rawurl, 0, NULL, 0) != 0)) return;
if (!interactive) { fprintf(fp, "%s\n", sel->repr); return; }
size = strlen(sel->repr);
do {
out = (int)size;
extra = 0;
switch (sel->type) {
case 'l': if (i == 0) extra = 3 + ndigits(*links); break;
case '`': goto print;
case '>':
case '*': extra = 2; break;
case '#': if (i == 0) extra = sel->level + 1;
}
memset(&ps, 0, sizeof(ps));
for (wchars = 0, out = 0, p = &sel->repr[i]; out < (int)size - i && wchars < width - extra; out += mbs, p = &sel->repr[i + out], wchars += w) {
if ((mbs = mbrtowc(&wchar, p, size - i - out, &ps)) == (size_t)-1 || mbs == (size_t)-2 || mbs == 0 || (w = wcwidth(wchar)) < 0) {
/* best-effort, we assume 1 character == 1 byte */
mbs = 1;
w = 1;
} else if (wchars + w > width - extra) break;
}
/* if it's a full line followed by a non-whitespace character, drop the cut word from the end */
if (wchars + extra == width && i + out < (int)size && sel->repr[i + out] != ' ' && sel->repr[i + out] != '\t') {
for (p = &sel->repr[i + out - 1]; p >= &sel->repr[i] && *p != ' ' && *p != '\t'; --p);
if (p > &sel->repr[i]) out = p - &sel->repr[i];
}
print:
switch (sel->type) {
case 'l':
if (i == 0) {
if (color) fprintf(fp, "\33[4;36m[%d]\33[0;39m %.*s\n", *links, out, &sel->repr[i]);
else fprintf(fp, "[%d] %.*s\n", *links, out, &sel->repr[i]);
break;
}
/* fall through */
case 'i': fprintf(fp, "%.*s\n", out, &sel->repr[i]); break;
case '#':
if (i == 0 && color) fprintf(fp, "\33[4m%.*s %.*s\33[0m\n", sel->level, "###", out, &sel->repr[i]);
else if (i == 0 && !color) fprintf(fp, "%.*s %.*s\n", sel->level, "###", out, &sel->repr[i]);
else if (color) fprintf(fp, "\33[4m%.*s\33[0m\n", out, &sel->repr[i]);
else fprintf(fp, "%.*s\n", out, &sel->repr[i]);
break;
case '`':
fprintf(fp, "%s\n", &sel->repr[i]);
break;
case '>':
fprintf(fp, "%c %.*s\n", sel->type, out, &sel->repr[i]);
break;
default:
if (i == 0) fprintf(fp, "%c %.*s\n", sel->type, out, &sel->repr[i]);
else fprintf(fp, " %.*s\n", out, &sel->repr[i]);
}
i += out + strspn(&sel->repr[i + out], " ");
} while (i < (int)size);
}
static void print_text(FILE *fp, const SelectorList list, const char *filter) {
regex_t re;
const Selector *sel;
int width, links = 0;
if (filter && regcomp(&re, filter, REG_NOSUB) != 0) filter = NULL;
width = get_terminal_width();
SIMPLEQ_FOREACH(sel, &list, next) print_line(fp, sel, filter ? &re : NULL, width, &links);
if (filter) regfree(&re);
}
/*============================================================================*/
static int tofu(X509 *cert, const URL *url, int ask) {
static char buffer[1024], hex[EVP_MAX_MD_SIZE * 2 + 1];
static unsigned char md[EVP_MAX_MD_SIZE];
size_t size = 1, hlen, plen;
const char *p, *end;
char *line, *start;
unsigned int mdlen, i;
int fd = -1, found = 0, trust = 0;
if (X509_digest(cert, EVP_sha512(), md, &mdlen) == 0) return 0;
for (i = 0; i < mdlen; ++i) {
hex[i * 2] = "0123456789ABCDEF"[md[i] >> 4];
hex[i * 2 + 1] = "0123456789ABCDEF"[md[i] & 0xf];
}
hex[mdlen * 2] = '\0';
hlen = strlen(url->host);
plen = strlen(url->port);
if ((p = map_file("hosts", &fd, &size)) == NULL && size > 0) return 0;
else if (p != NULL) {
for (end = p; !found && (start = memmem(end, size - (end - p), url->host, hlen)) != NULL; end = start + hlen + 1) {
if (!(found = ((start == p || *(start - 1) == '\n') && size - (start - p) >= hlen + 1 + plen + 1 + mdlen * 2 + 1 && start[hlen] == ':' && memcmp(&start[hlen + 1], url->port, plen) == 0 && start[hlen + 1 + plen] == ' ' && start[hlen + 1 + plen + 1 + mdlen * 2] == '\n'))) continue;
if ((trust = memcmp(&start[hlen + 1 + plen + 1], hex, mdlen * 2) == 0) || !ask) break;
if (color) snprintf(buffer, sizeof(buffer), "\33[35mTrust new certificate for `%s:%s`? (y/n)>\33[0m ", url->host, url->port);
else snprintf(buffer, sizeof(buffer), "Trust new certificate for `%s:%s`? (y/n)> ", url->host, url->port);
if ((line = bestline(buffer)) != NULL) {
if (*line == 'y' || *line == 'Y') {
memcpy(&start[hlen + 1 + plen + 1], hex, mdlen * 2);
trust = 1;
}
free(line);
}
munmap((void *)p, size);
}
}
if (!found) trust = append_line(fd, "%s:%s %s\n", url->host, url->port, hex);
close(fd);
return trust;
}
static SSL *ssl_connect(const URL *url, SSL_CTX *ctx, int ask) {
BIO *bio = NULL;
SSL *ssl = NULL;
X509 *cert = NULL;
int fd = -1, ok = 0, err;
if ((fd = tcp_connect(url)) == -1) goto out;
if ((ssl = SSL_new(ctx)) == NULL || (bio = BIO_new_socket(fd, BIO_CLOSE)) == NULL || SSL_set_tlsext_host_name(ssl, url->host) == 0) {
error(0, "cannot establish secure connection to `%s`:`%s`", url->host, url->port);
goto out;
}
SSL_set_bio(ssl, bio, bio);
SSL_set_connect_state(ssl);
if ((err = SSL_get_error(ssl, SSL_do_handshake(ssl))) != SSL_ERROR_NONE) {
if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) error(0, "cannot establish secure connection to `%s`:`%s`: cancelled", url->host, url->port);
else error(0, "cannot establish secure connection to `%s`:`%s`: error %d", url->host, url->port, err);
goto out;
}
if ((cert = SSL_get_peer_certificate(ssl)) == NULL) {
error(0, "cannot establish secure connection to `%s`:`%s`: no peer certificate", url->host, url->port);
goto out;
}
if (!(ok = tofu(cert, url, ask))) error(0, "cannot establish secure connection to `%s`:`%s`: bad certificate", url->host, url->port);
out:
if (cert) X509_free(cert);
if (!ok && ssl) SSL_free(ssl);
else if (!ok && bio) BIO_free(bio);
else if (!ok && fd != -1) close(fd);
return ok ? ssl : NULL;
}
static void mkcert(const char *crtpath, const char *keypath) {
EVP_PKEY *key = NULL;
#if OPENSSL_VERSION_NUMBER < 0x30000000L
EC_KEY *eckey = NULL;
#endif
X509 *cert = NULL;
X509_NAME *name;
const char *curve, *digest, *cn;
const EVP_MD *md;
FILE *crtf = NULL, *keyf = NULL;
long days;
int ok = 0;
#if OPENSSL_VERSION_NUMBER < 0x30000000L
int assigned = 0, nid;
#endif
if ((days = get_var_integer("DAYS", 1825)) <= 0) days = 1825;
if ((curve = set_var(&variables, "CURVE", NULL)) == NULL || *curve == '\0') curve = SN_X9_62_prime256v1;
if ((digest = set_var(&variables, "DIGEST", NULL)) == NULL || *digest == '\0') digest = LN_sha256;
#if OPENSSL_VERSION_NUMBER < 0x30000000L
ok = ((((cn = set_var(&variables, "CN", NULL)) != NULL && *cn != '\0') || ((cn = getenv("USER")) != NULL && *cn != '\0')) && (md = EVP_get_digestbyname(digest)) != NULL && (cert = X509_new()) != NULL && X509_set_version(cert, 2) == 1 && X509_gmtime_adj(X509_get_notBefore(cert), 0) != NULL && X509_gmtime_adj(X509_get_notAfter(cert), 60 * 60 * 24 * days) != NULL && (name = X509_get_subject_name(cert)) != NULL && X509_NAME_add_entry_by_txt(name, "CN", MBSTRING_ASC, (const unsigned char *)cn, -1, -1, 0) == 1 && (key = EVP_PKEY_new()) != NULL && (nid = OBJ_sn2nid(curve)) != NID_undef && (eckey = EC_KEY_new_by_curve_name(nid)) != NULL && EC_KEY_generate_key(eckey) == 1 && (assigned = EVP_PKEY_assign_EC_KEY(key, eckey)) == 1 && X509_set_pubkey(cert, key) == 1 && X509_sign(cert, key, md) != 0 && (crtf = fopen(crtpath, "w")) != NULL && (keyf = fopen(keypath, "w")) != NULL && PEM_write_X509(crtf, cert) != 0 && PEM_write_PrivateKey(keyf, key, NULL, NULL, 0, NULL, NULL) != 0);
#else
ok = ((((cn = set_var(&variables, "CN", NULL)) != NULL && *cn != '\0') || ((cn = getenv("USER")) != NULL && *cn != '\0')) && (md = EVP_get_digestbyname(digest)) != NULL && (cert = X509_new()) != NULL && X509_set_version(cert, X509_VERSION_3) == 1 && X509_gmtime_adj(X509_get_notBefore(cert), 0) != NULL && X509_gmtime_adj(X509_get_notAfter(cert), 60 * 60 * 24 * days) != NULL && (name = X509_get_subject_name(cert)) != NULL && X509_NAME_add_entry_by_txt(name, "CN", MBSTRING_ASC, (const unsigned char *)cn, -1, -1, 0) == 1 && (key = EVP_EC_gen(curve)) != NULL && X509_set_pubkey(cert, key) == 1 && X509_sign(cert, key, md) != 0 && (crtf = fopen(crtpath, "w")) != NULL && (keyf = fopen(keypath, "w")) != NULL && PEM_write_X509(crtf, cert) != 0 && PEM_write_PrivateKey(keyf, key, NULL, NULL, 0, NULL, NULL) != 0);
#endif
if (keyf) {
fclose(keyf);
if (ok == 0) unlink(keypath);
}
if (crtf) {
fclose(crtf);
if (ok == 0) unlink(crtpath);
}
#if OPENSSL_VERSION_NUMBER < 0x30000000L
if (!assigned && eckey) EC_KEY_free(eckey);
#endif
if (key) EVP_PKEY_free(key);
if (cert) X509_free(cert);
}
static int ssl_error(const URL *url, void *c, int err) {
if ((err = SSL_get_error((SSL *)c, err)) == SSL_ERROR_ZERO_RETURN) return 0;
if (err == SSL_ERROR_SSL) { error(0, "protocol error while downloading `%s`", url->url); return 0; }; /* some servers seem to ignore this part of the specification (v0.16.1): "As per RFCs 5246 and 8446, Gemini servers MUST send a TLS `close_notify`" */
if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) error(0, "failed to download `%s`: cancelled", url->url);
else error(0, "failed to download `%s`: error %d", url->url, err);
return 1;
}
static int ssl_read(void *c, void *buffer, int length) {
return SSL_read((SSL *)c, buffer, length);
}
static int ssl_peek(void *c, void *buffer, int length) {
return SSL_peek((SSL *)c, buffer, length);
}
static void ssl_close(void *c) {
SSL_free((SSL *)c);
}
static int save_body(const URL *url, void *c, FILE *fp) {
static char buffer[2048];
size_t total;
int received, prog = 0;
for (total = 0; total < SIZE_MAX - sizeof(buffer) && (received = url->proto->read(c, buffer, sizeof(buffer))) > 0 && fwrite(buffer, 1, received, fp) == (size_t)received; total += received) {
if ((total > 2048 && total - prog > total / 20)) { fputc('.', stderr); prog = total; }
}
if (prog > 0) fputc('\n', stderr);
if (ferror(fp)) { error(0, "failed to download `%s`: failed to write", url->url); return 0; }
return !url->proto->error(url, c, received);
}
static int ssl_download(URL *url, SSL **body, char **mime, int request(const URL *, SSL *, void *), void *p, int ask) {
static char crtpath[1024], keypath[1024], suffix[1024], buffer[1024], data[2 + 1 + 1024 + 2 + 1]; /* 99 meta\r\n\0 */
struct stat stbuf;
const char *home;
SSL_CTX *ctx = NULL;
char *crlf, *meta = &data[3], *line;
int redir, off, len, i, total, received, ret = 40, err = 0;
SSL *ssl = NULL;
if ((redir = perm_redirect(url, NULL, ask)) == 31) return 31;
else if (redir == 40) goto fail;
if ((home = getenv("XDG_DATA_HOME")) != NULL) {
if ((off = snprintf(crtpath, sizeof(crtpath), "%s/gplaces_%s_%s", home, url->host, url->port)) >= (int)sizeof(crtpath)) goto fail;;
} else if ((home = getenv("HOME")) == NULL || (off = snprintf(crtpath, sizeof(crtpath), "%s/.gplaces_%s_%s", home, url->host, url->port)) >= (int)sizeof(crtpath)) goto fail;
if ((ctx = SSL_CTX_new(TLS_client_method())) == NULL) goto fail;
SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1);
SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL);
/*
* If the user requests gemini:https://example.com/foo/bar/baz.gmi, try to load: