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gplaces.c
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/*
================================================================================
gplaces - a simple terminal Gemini client
Copyright (C) 2022 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 "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 {
SIMPLEQ_ENTRY(Selector) next;
int level;
char type, *repr, *scheme, *host, *port, *path, *url, *rawurl;
CURLU *cu;
} Selector;
typedef SIMPLEQ_HEAD(, Selector) SelectorList;
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;
typedef struct Help {
const char *name;
const char *text;
} Help;
/*============================================================================*/
static VariableList variables = LIST_HEAD_INITIALIZER(variables);
static SelectorList subscriptions = SIMPLEQ_HEAD_INITIALIZER(subscriptions);
static SelectorList menu = SIMPLEQ_HEAD_INITIALIZER(menu);
static char prompt[256] = "\33[35m>\33[0m ";
static const char defport[] = "1965";
static char *current;
static int interactive;
static int color;
/*============================================================================*/
__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 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);
curl_free(sel->scheme);
curl_free(sel->host);
if (sel->port != defport) curl_free(sel->port);
curl_free(sel->path);
curl_free(sel->url);
free(sel->rawurl);
if (sel->cu) curl_url_cleanup(sel->cu);
free(sel);
}
static void free_selectors(SelectorList *list) {
Selector *sel, *tmp;
SIMPLEQ_FOREACH_SAFE(sel, list, next, tmp) free_selector(sel);
}
static int set_input(Selector *sel, const char *input) {
char *query;
if ((query = curl_easy_escape(NULL, input, 0)) == NULL) return 0;
if (curl_url_set(sel->cu, CURLUPART_QUERY, query, CURLU_NON_SUPPORT_SCHEME) != CURLUE_OK) { curl_free(query); return 0; }
curl_free(query);
return 1;
}
static int parse_url(Selector *sel, 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 ((sel->cu == NULL && (sel->cu = curl_url()) == NULL) || (from != NULL && curl_url_set(sel->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(sel->cu, CURLUPART_URL, sel->rawurl, CURLU_NON_SUPPORT_SCHEME) != CURLUE_OK) {
snprintf(buffer, sizeof(buffer), "gemini://%s", sel->rawurl);
if (curl_url_set(sel->cu, CURLUPART_URL, buffer, CURLU_NON_SUPPORT_SCHEME) != CURLUE_OK) return 0;
}
if (input != NULL && input[0] != '\0' && !set_input(sel, input)) return 0;
if (curl_url_get(sel->cu, CURLUPART_SCHEME, &sel->scheme, 0) != CURLUE_OK || (!(file = (strcmp(sel->scheme, "file") == 0)) && curl_url_get(sel->cu, CURLUPART_HOST, &sel->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(sel->host, &host, IDN2_NONTRANSITIONAL) == IDN2_OK || idn2_to_ascii_8z(sel->host, &host, IDN2_TRANSITIONAL) == IDN2_OK)) {
#elif defined(GPLACES_USE_LIBIDN)
if (!file && idna_to_ascii_8z(sel->host, &host, 0) == IDNA_SUCCESS) {
#endif
if (curl_url_set(sel->cu, CURLUPART_HOST, host, 0) != CURLUE_OK) { free(host); return 0; }
free(host);
curl_free(sel->host); sel->host = NULL;
if (curl_url_get(sel->cu, CURLUPART_HOST, &sel->host, 0) != CURLUE_OK) return 0;
}
#endif
if (curl_url_get(sel->cu, CURLUPART_URL, &sel->url, 0) != CURLUE_OK || curl_url_get(sel->cu, CURLUPART_PATH, &sel->path, 0) != CURLUE_OK) return 0;
if (file) return 1;
switch (curl_url_get(sel->cu, CURLUPART_PORT, &sel->port, 0)) {
case CURLUE_OK: break;
case CURLUE_NO_PORT: sel->port = (char *)defport; break;
default: return 0;
}
return 1;
}
static Selector *find_selector(SelectorList *list, int index) {
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 parse_plaintext_line(char *line, int start, int *pre, Selector **sel, SelectorList *list) {
(void)start;
(void)pre;
(void)index;
line[strcspn(line, "\r\n")] = '\0';
*sel = new_selector('`');
(*sel)->repr = str_copy(line);
SIMPLEQ_INSERT_TAIL(list, *sel, next);
}
static void parse_gemtext_line(char *line, int start, int *pre, Selector **sel, SelectorList *list) {
char *url;
int level;
*sel = NULL;
if (start && strncmp(line, "\xef\xbb\xbf", 3) == 0) line += 3;
if (strncmp(line, "```", 3) == 0) {
*pre = !*pre;
return;
}
line[strcspn(line, "\r\n")] = '\0';
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, void (*parse_line)(char *, int, int *, Selector **, SelectorList *)) {
static char buffer[LINE_MAX];
char *line;
SelectorList list = SIMPLEQ_HEAD_INITIALIZER(list);
Selector *sel;
int pre = 0, start = 1;
for (sel = NULL; (line = fgets(buffer, sizeof(buffer), fp)) != NULL; sel = NULL, start = 0) {
parse_line(line, start, &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, Selector *to, int stdin) {
static char command[1024], buffer[sizeof("/proc/self/fd/2147483647")];
size_t l;
pid_t pid;
if (stdin != -1) {
sprintf(buffer, "/proc/self/fd/%d", stdin);
filename = buffer;
}
for (l = 0; *handler && l < sizeof(command) - 1; ) {
if (handler[0] == '%' && handler[1] != '\0') {
const char *append = "";
switch (handler[1]) {
case '%': append = "%"; break;
case 's': append = to->scheme; break;
case 'h': append = to->host; break;
case 'p': append = to->port; break;
case 'P': append = to->path; break;
case 'r': append = to->repr; break;
case 'u': append = to->url; break;
case 'f': append = filename; break;
}
handler += 2;
while (*append && l < sizeof(command) - 1) command[l++] = *append++;
} else command[l++] = *handler++;
}
command[l] = '\0';
if ((pid = fork()) == 0) {
execl("/bin/sh", "sh", "-c", command, (char *)NULL);
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, Selector *to) {
pid_t pid;
if ((pid = start_handler(handler, filename, to, -1)) > 0) reap(handler, pid, 0);
}
/*============================================================================*/
static int ndigits(int n) {
int digits = 0;
for ( ; n > 0; n /= 10, ++digits);
return digits;
}
static void print_gemtext_line(FILE *fp, 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;
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);
if (size == 0) { fputc('\n', fp); return; }
for (i = 0, out = (int)size; i < (int)size; i += out, i += strspn(&sel->repr[i], " "), 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) fprintf(fp, "%.*s %.*s\n", sel->level, "###", 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]);
}
}
}
static void print_gemtext(FILE *fp, SelectorList *list, const char *filter) {
regex_t re;
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_gemtext_line(fp, sel, filter ? &re : NULL, width, &links);
if (filter) regfree(&re);
}
/*============================================================================*/
static int tofu(X509 *cert, const char *host, int ask) {
static char hosts[1024], buffer[1024], hex[EVP_MAX_MD_SIZE * 2 + 1];
static unsigned char md[EVP_MAX_MD_SIZE];
struct stat stbuf;
size_t hlen;
FILE *fp = NULL;
const char *home, *end, *p = MAP_FAILED;
char *start, *line;
unsigned int mdlen, i;
int fd, 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(host);
if ((home = getenv("XDG_DATA_HOME")) != NULL) snprintf(hosts, sizeof(hosts), "%s/gplaces_hosts", home);
else if ((home = getenv("HOME")) != NULL) snprintf(hosts, sizeof(hosts), "%s/.gplaces_hosts", home);
else return 0;
if ((fd = open(hosts, O_RDWR | O_CREAT | O_APPEND, 0600)) != -1) {
if (fstat(fd, &stbuf) == -1) { close(fd); return 0; }
if (stbuf.st_size > 0) {
if ((p = mmap(NULL, stbuf.st_size % SIZE_MAX, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) { close(fd); return 0; }
for (end = (const char *)p; !found && (start = memmem(end, stbuf.st_size - (end - p), host, hlen)) != NULL; end = start + hlen + 1) {
if (!(found = ((start == p || *(start - 1) == '\n') && (size_t)stbuf.st_size - (start - p) >= hlen + 2 && start[hlen] == ' ' && start[hlen + 1] != '\n'))) continue;
if ((size_t)stbuf.st_size - (start - p) < hlen + 1 + mdlen * 2 + 1 || start[hlen + 1 + mdlen * 2] != '\n') break;
if ((trust = memcmp(&start[hlen + 1], hex, mdlen * 2) == 0) || !ask) break;
if (color) snprintf(buffer, sizeof(buffer), "\33[35mTrust new certificate for `%s`? (y/n)>\33[0m ", host);
else snprintf(buffer, sizeof(buffer), "Trust new certificate for `%s`? (y/n)> ", host);
if ((line = bestline(buffer)) != NULL) {
if (*line == 'y' || *line == 'Y') {
memcpy(&start[hlen + 1], hex, mdlen * 2);
trust = 1;
}
free(line);
}
}
munmap((void *)p, stbuf.st_size);
}
if (!found && (fp = fdopen(fd, "w")) != NULL) {
trust = fprintf(fp, "%s %s\n", host, hex) > 0;
fclose(fp);
} else close(fd);
} else return 0;
return trust;
}
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(Selector *sel, SSL *ssl, int err) {
if ((err = SSL_get_error(ssl, err)) == SSL_ERROR_ZERO_RETURN) return 0;
if (err == SSL_ERROR_SSL) { error(0, "protocol error while downloading `%s`", sel->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", sel->url);
else error(0, "failed to download `%s`: error %d", sel->url, err);
return 1;
}
static int save_body(Selector *sel, SSL *ssl, FILE *fp) {
static char buffer[2048];
size_t total;
int received, prog = 0;
for (total = 0; total < SIZE_MAX - sizeof(buffer) && (received = SSL_read(ssl, 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", sel->url); return 0; }
return !ssl_error(sel, ssl, received);
}
static int do_download(Selector *sel, SSL_CTX *ctx, const char *crtpath, const char *keypath, SSL **body, char **mime, int ask) {
static char buffer[1024], data[2 + 1 + 1024 + 2 + 1]; /* 99 meta\r\n\0 */
struct addrinfo hints = {.ai_family = AF_UNSPEC, .ai_socktype = SOCK_STREAM, .ai_protocol = IPPROTO_TCP}, *result, *it;
struct stat stbuf;
char *crlf, *meta = &data[3], *line, *url;
struct timeval tv = {0};
int timeout, fd = -1, len, total, received, ret = 40, err = 0;
BIO *bio = NULL;
SSL *ssl = NULL;
X509 *cert = NULL;
if ((timeout = get_var_integer("TIMEOUT", 15)) < 1) timeout = 15;
tv.tv_sec = timeout;
if ((err = getaddrinfo(sel->host, sel->port, &hints, &result)) != 0) {
error(0, "cannot resolve hostname `%s`: %s", sel->host, gai_strerror(err));
goto fail;
}
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) {
if (errno == EINPROGRESS) error(0, "cannot connect to `%s`:`%s`: cancelled", sel->host, sel->port);
else error(0, "cannot connect to `%s`:`%s`: %s", sel->host, sel->port, strerror(err));
goto fail;
}
if ((ssl = SSL_new(ctx)) == NULL || (bio = BIO_new_socket(fd, BIO_CLOSE)) == NULL || SSL_set_tlsext_host_name(ssl, sel->host) == 0) {
error(0, "cannot establish secure connection to `%s`:`%s`", sel->host, sel->port);
goto fail;
}
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", sel->host, sel->port);
else error(0, "cannot establish secure connection to `%s`:`%s`: error %d", sel->host, sel->port, err);
goto fail;
}
if ((cert = SSL_get_peer_certificate(ssl)) == NULL) {
error(0, "cannot establish secure connection to `%s`:`%s`: no peer certificate", sel->host, sel->port);
goto fail;
}
if (!tofu(cert, sel->host, ask)) {
error(0, "cannot establish secure connection to `%s`:`%s`: bad certificate", sel->host, sel->port);
goto fail;
}
len = snprintf(buffer, sizeof(buffer), "%s\r\n", sel->url);
if ((err = SSL_get_error(ssl, SSL_write(ssl, buffer, len >= (int)sizeof(buffer) ? (int)sizeof(buffer) - 1 : len))) != SSL_ERROR_NONE) {
if (err == SSL_ERROR_WANT_READ || err == SSL_ERROR_WANT_WRITE) error(0, "cannot send request to `%s`:`%s`: cancelled", sel->host, sel->port);
else error(0, "cannot send request to `%s`:`%s`: error %d", sel->host, sel->port, err);
goto fail;
}
for (total = 0; total < (int)sizeof(data) - 1 && (total < 4 || (data[total - 2] != '\r' && data[total - 1] != '\n')) && (received = SSL_read(ssl, &data[total], 1)) > 0; ++total);
if (received <= 0 && ssl_error(sel, ssl, received)) goto fail;
else if (total < 4 || data[0] < '1' || data[0] > '6' || data[1] < '0' || data[1] > '9' || (total > 4 && data[2] != ' ') || data[total - 2] != '\r' || data[total - 1] != '\n') { error(0, "failed to download `%s`: invalid status line", sel->url); goto fail; }
data[total] = '\0';
crlf = &data[total - 2];
*crlf = '\0';
if (meta >= crlf) meta = "";
switch (data[0]) {
case '2':
if (!*meta) goto fail;
*body = ssl;
ssl = NULL; bio = NULL; fd = -1;
*mime = meta;
break;
case '1':
if (!ask || !*meta) goto fail;
if (color) snprintf(buffer, sizeof(buffer), "\33[35m%.*s>\33[0m ", get_terminal_width() - 2, meta);
else snprintf(buffer, sizeof(buffer), "%.*s> ", get_terminal_width() - 2, meta);
if (data[1] == '1') bestlineMaskModeEnable();
if ((line = bestline(buffer)) == NULL) goto fail;
if (data[1] != '1' && interactive) bestlineHistoryAdd(line);
if (data[1] == '1') bestlineMaskModeDisable();
if (!set_input(sel, line)) { free(line); goto fail; }
free(line);
if (curl_url_get(sel->cu, CURLUPART_URL, &url, 0) != CURLUE_OK) goto fail;
curl_free(sel->url); sel->url = url;
if (data[1] != '1' && interactive) bestlineHistoryAdd(url);
break;
case '3':
if (!*meta || curl_url_set(sel->cu, CURLUPART_URL, meta, CURLU_NON_SUPPORT_SCHEME) != CURLUE_OK || curl_url_get(sel->cu, CURLUPART_URL, &url, 0) != CURLUE_OK) goto fail;
curl_free(sel->url); sel->url = url;
fprintf(stderr, "redirected to `%s`\n", sel->url);
break;
case '6':
if (*meta) error(0, "`%s`: %s", sel->host, meta);
else error(0, "client certificate is required for `%s`", sel->host);
if (ask && stat(crtpath, &stbuf) != 0 && errno == ENOENT && stat(keypath, &stbuf) != 0 && errno == ENOENT) {
if (color) snprintf(buffer, sizeof(buffer), "\33[35mGenerate client certificate for `%s`? (y/n)>\33[0m ", sel->host);
else snprintf(buffer, sizeof(buffer), "Generate client certificate for `%s`? (y/n)> ", sel->host);
if ((line = bestline(buffer)) != NULL) {
if (*line == 'y' || *line == 'Y') mkcert(crtpath, keypath);
free(line);
}
}
if (SSL_CTX_use_certificate_file(ctx, crtpath, SSL_FILETYPE_PEM) == 1 && SSL_CTX_use_PrivateKey_file(ctx, keypath, SSL_FILETYPE_PEM) == 1) break;
error(0, "failed to load client certificate for `%s`: %s", sel->host, ERR_reason_error_string(ERR_get_error()));
ret = 50;
goto fail;
default:
error(0, "cannot download `%s`: %s", sel->url, *meta ? meta : data);
}
ret = (data[0] - '0') * 10 + (data[1] - '0');
fail:
if (cert) X509_free(cert);
if (ssl) SSL_free(ssl);
else if (bio) BIO_free(bio);
else if (fd != -1) close(fd);
return ret;
}
static void sigint(int sig) {
(void)sig;
}
static SSL *download(Selector *sel, char **mime, int ask) {
static char crtpath[1024], keypath[1024], suffix[1024];
struct stat stbuf;
const char *home;
SSL_CTX *ctx = NULL;
SSL *ssl = NULL;
int status, redirs = 0, needcert = 0, len, i, off;
if ((home = getenv("XDG_DATA_HOME")) != NULL) {
if ((off = snprintf(crtpath, sizeof(crtpath), "%s/gplaces_%s", home, sel->host)) >= (int)sizeof(crtpath)) return NULL;
} else if ((home = getenv("HOME")) == NULL || (off = snprintf(crtpath, sizeof(crtpath), "%s/.gplaces_%s", home, sel->host)) >= (int)sizeof(crtpath)) return NULL;
if ((ctx = SSL_CTX_new(TLS_client_method())) == NULL) return NULL;
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://example.com/foo/bar/baz.gmi, try to load:
*
* 1) The certificate for gemini://example.com/foo/bar/baz.gmi
* 2) The certificate for gemini://example.com/foo/bar
* 3) The certificate for gemini://example.com/foo
* 4) The certificate for gemini://example.com
*
* If we found a certificate for one of these, stop even if loading fails.
*/
for (len = 0; len < (int)sizeof(suffix) - 1 && sel->path[len] != '\0'; ++len) suffix[len] = sel->path[len] == '/' ? '_' : sel->path[len];
suffix[len] = '\0';
memcpy(keypath, crtpath, off);
for (i = sel->path[len - 1] == '/' ? len - 1 : len; i >= 0; --i) {
if (i < len && sel->path[i] != '/') continue;
snprintf(&crtpath[off], sizeof(crtpath) - off, "%.*s.crt", i, suffix);
snprintf(&keypath[off], sizeof(keypath) - off, "%.*s.key", i, suffix);
if (stat(crtpath, &stbuf) == 0 && stat(keypath, &stbuf) == 0) {
SSL_CTX_use_certificate_file(ctx, crtpath, SSL_FILETYPE_PEM);
SSL_CTX_use_PrivateKey_file(ctx, keypath, SSL_FILETYPE_PEM);
goto loaded;
}
}
/*
* if we failed to find a matching certificate and a certificate is
* generated, we want to associate it with the full path
*/
snprintf(&crtpath[off], sizeof(crtpath) - off, "%s.crt", suffix);
snprintf(&keypath[off], sizeof(keypath) - off, "%s.key", suffix);
loaded:
do {
status = do_download(sel, ctx, crtpath, keypath, &ssl, mime, ask);
if (status >= 20 && status <= 29) break;
} while ((status >= 10 && status <= 19) || (status >= 60 && status <= 69 && ++needcert == 1) || (status >= 30 && status <= 39 && ++redirs < 5));
SSL_CTX_free(ctx);
if (redirs == 5) error(0, "too many redirects from `%s`", sel->url);
return ssl;
}
static const char *get_filename(Selector *sel, size_t *len) {
/*
* skip the leading /
* trim all trailing /
* if the path is /, use the hostname
* find the last / and skip it
* if there's no /, return the path
*/
const char *p;
*len = strlen(&sel->path[1]);
while (*len > 0 && sel->path[1 + *len - 1] == '/') --*len;
if (*len == 0) {
*len = strlen(sel->host);
return sel->host;
}
p = memrchr(&sel->path[1], '/', *len);
if (p == NULL) return &sel->path[1];
*len -= p + 1 - &sel->path[1];
return p + 1;
}
static void stream_to_handler(Selector *sel, const char *filename) {
int fds[2];
char *mime = NULL;
SSL *ssl = NULL;
const char *handler;
FILE *fp;
pid_t pid;
if (pipe(fds) == -1) return;
if (fcntl(fds[1], F_SETFD, FD_CLOEXEC) == 0 && (fp = fdopen(fds[1], "w")) != NULL) {
setbuf(fp, NULL);
if ((ssl = download(sel, &mime, 1)) != NULL) {
if ((handler = find_mime_handler(mime)) != NULL && (pid = start_handler(handler, filename, sel, fds[0])) > 0) {
close(fds[0]); fds[0] = -1;
save_body(sel, ssl, fp);
fclose(fp); fp = NULL;
reap(handler, pid, 0);
}
SSL_free(ssl);
}
if (fds[0] != -1) close(fds[0]);
if (fp != NULL) fclose(fp);
} else {
close(fds[0]);
close(fds[1]);
}
}
static void download_to_file(Selector *sel, const char *def) {
static char suggestion[256], buffer[1024];
FILE *fp;
char *mime = NULL, *input = NULL, *download_dir;
const char *filename = def;
SSL *ssl = NULL;
size_t len;
int ret = 0;
if (def != NULL && strcmp(def, "-") == 0) { stream_to_handler(sel, def); return; }
if (def == NULL) {
def = get_filename(sel, &len);
if (((download_dir = set_var(&variables, "DOWNLOAD_DIRECTORY", NULL)) != NULL && *download_dir != '\0') || (download_dir = getenv("XDG_DOWNLOAD_DIR")) != NULL) snprintf(suggestion, sizeof(suggestion), "%s/%.*s", download_dir, (int)len, def);
else if ((download_dir = getenv("HOME")) != NULL) {
snprintf(suggestion, sizeof(suggestion), "%s/Downloads", download_dir);
if (access(suggestion, F_OK) == 0) snprintf(suggestion, sizeof(suggestion), "%s/Downloads/%.*s", download_dir, (int)len, def);
else snprintf(suggestion, sizeof(suggestion), "%s/%.*s", download_dir, (int)len, def);
} else snprintf(suggestion, sizeof(suggestion), "./%.*s", (int)len, def);
snprintf(buffer, sizeof(buffer), "enter filename (press ENTER for `%s`): ", suggestion);
if ((input = bestline(buffer)) == NULL) return;
if (*input != '\0') filename = input;
else filename = suggestion;
}
if ((fp = fopen(filename, "wb")) == NULL) error(0, "cannot create file `%s`: %s", filename, strerror(errno));
else {
if ((ssl = download(sel, &mime, 1)) != NULL) {
ret = save_body(sel, ssl, fp);
SSL_free(ssl);
}
fclose(fp);
if (!ret) unlink(filename);
}
free(input);
}
static void save_and_handle(Selector *sel, SSL *ssl, const char *mime) {
static char filename[1024];
FILE *fp = NULL;
const char *tmpdir, *handler = NULL;
int fd = -1;
if ((handler = find_mime_handler(mime)) == NULL) return;
if ((tmpdir = getenv("TMPDIR")) == NULL) tmpdir = "/tmp/";
snprintf(filename, sizeof(filename), "%sgplaces.XXXXXXXX", tmpdir);
if ((fd = mkstemp(filename)) == -1 || (fp = fdopen(fd, "w")) == NULL) error(0, "cannot create temporary file: %s", strerror(errno));
else if (save_body(sel, ssl, fp) && fflush(fp) == 0) execute_handler(handler, filename, sel);
if (fp != NULL) fclose(fp);
if (fd != -1) {
if (fp == NULL) close(fd);
unlink(filename);
}
}
static SelectorList download_text(Selector *sel, int ask, int handle, int print) {
static char buffer[LINE_MAX];
SelectorList list = SIMPLEQ_HEAD_INITIALIZER(list);
Selector *it;
char *mime, *p = NULL, *start, *end;
SSL *ssl = NULL;
size_t parsed, length = 0, total = 0, prog = 0;
int plain, received, pre = 0, width, ok = 0, links = 0;
if ((ssl = download(sel, &mime, ask)) == NULL) goto out;
if (!(plain = strncmp(mime, "text/plain", 10) == 0) && strncmp(mime, "text/gemini", 11) != 0) {
if (handle) save_and_handle(sel, ssl, mime);
goto out;
}
width = get_terminal_width();
while ((received = SSL_read(ssl, &buffer[length], sizeof(buffer) - length)) > 0) {
for (length += received, parsed = 0, start = buffer; start < buffer + length; parsed += end - start + 1, start = end + 1) {
if ((end = memchr(start, '\n', length - parsed)) == NULL) {
if (parsed > 0 || length < sizeof(buffer)) break; /* if we still don't have the end of the line, receive more */
end = &buffer[sizeof(buffer) - 1]; /* if the buffer is full and we haven't found a \n, terminate the line */
}
*end = '\0';
if (plain || !interactive) parse_plaintext_line(start, parsed == 0, &pre, &it, &list);
else parse_gemtext_line(start, parsed == 0, &pre, &it, &list);
if (print && it) print_gemtext_line(stdout, it, NULL, width, &links);
}
length -= parsed;
memmove(buffer, &buffer[parsed], length);
buffer[length] = '\0';
total += received;
if (!print && total > 2048 && total - prog > total / 20) { fputc('.', stderr); prog = total; }
if (total > SIZE_MAX - sizeof(buffer)) break;
}
if (prog > 0) fputc('\n', stderr);
if (!(ok = (received <= 0 && !ssl_error(sel, ssl, received)))) goto out;
if (length > 0) {
if (plain || !interactive) parse_plaintext_line(buffer, parsed == 0, &pre, &it, &list);
else parse_gemtext_line(buffer, parsed == 0, &pre, &it, &list);
if (print && it) print_gemtext_line(stdout, it, NULL, width, &links);
}
out:
free(p);
if (ssl != NULL) SSL_free(ssl);
if (!ok) { free_selectors(&list); SIMPLEQ_INIT(&list); }