mirror of
https://github.com/omar-polo/gmid.git
synced 2024-08-28 15:17:19 +02:00
491 lines
9.4 KiB
C
491 lines
9.4 KiB
C
/*
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* Copyright (c) 2020 Omar Polo <op@omarpolo.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <netdb.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <string.h>
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#include "gmid.h"
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struct vhost hosts[HOSTSLEN];
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int goterror;
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int exfd;
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struct conf conf;
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void
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fatal(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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if (conf.foreground) {
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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} else
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vsyslog(LOG_DAEMON | LOG_CRIT, fmt, ap);
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va_end(ap);
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exit(1);
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}
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void
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logs(int priority, struct client *c,
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const char *fmt, ...)
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{
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char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
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char *fmted, *s;
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size_t len;
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int ec;
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va_list ap;
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va_start(ap, fmt);
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if (c == NULL) {
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strncpy(hbuf, "<internal>", sizeof(hbuf));
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sbuf[0] = '\0';
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} else {
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len = sizeof(c->addr);
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ec = getnameinfo((struct sockaddr*)&c->addr, len,
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hbuf, sizeof(hbuf),
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sbuf, sizeof(sbuf),
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NI_NUMERICHOST | NI_NUMERICSERV);
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if (ec != 0)
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fatal("getnameinfo: %s", gai_strerror(ec));
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}
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if (vasprintf(&fmted, fmt, ap) == -1)
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fatal("vasprintf: %s", strerror(errno));
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if (conf.foreground)
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fprintf(stderr, "%s:%s %s\n", hbuf, sbuf, fmted);
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else {
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if (asprintf(&s, "%s:%s %s", hbuf, sbuf, fmted) == -1)
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fatal("asprintf: %s", strerror(errno));
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syslog(priority | LOG_DAEMON, "%s", s);
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free(s);
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}
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free(fmted);
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va_end(ap);
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}
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/* strchr, but with a bound */
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static char *
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gmid_strnchr(char *s, int c, size_t len)
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{
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size_t i;
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for (i = 0; i < len; ++i)
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if (s[i] == c)
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return &s[i];
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return NULL;
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}
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void
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log_request(struct client *c, char *meta, size_t l)
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{
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char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV], b[GEMINI_URL_LEN];
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char *t;
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size_t len;
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int ec;
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len = sizeof(c->addr);
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ec = getnameinfo((struct sockaddr*)&c->addr, len,
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hbuf, sizeof(hbuf),
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sbuf, sizeof(sbuf),
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NI_NUMERICHOST | NI_NUMERICSERV);
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if (ec != 0)
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fatal("getnameinfo: %s", gai_strerror(ec));
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if (c->iri.schema != NULL) {
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/* serialize the IRI */
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strlcpy(b, c->iri.schema, sizeof(b));
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strlcat(b, "://", sizeof(b));
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strlcat(b, c->iri.host, sizeof(b));
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strlcat(b, "/", sizeof(b));
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strlcat(b, c->iri.path, sizeof(b)); /* TODO: sanitize UTF8 */
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if (*c->iri.query != '\0') { /* TODO: sanitize UTF8 */
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strlcat(b, "?", sizeof(b));
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strlcat(b, c->iri.query, sizeof(b));
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}
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} else {
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strlcpy(b, c->req, sizeof(b));
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}
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if ((t = gmid_strnchr(meta, '\r', l)) == NULL)
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t = meta + len;
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if (conf.foreground)
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fprintf(stderr, "%s:%s GET %s %.*s\n", hbuf, sbuf, b,
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(int)(t - meta), meta);
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else
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syslog(LOG_INFO | LOG_DAEMON, "%s:%s GET %s %.*s",
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hbuf, sbuf, b, (int)(t - meta), meta);
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}
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void
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sig_handler(int sig)
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{
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(void)sig;
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}
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int
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starts_with(const char *str, const char *prefix)
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{
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size_t i;
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for (i = 0; prefix[i] != '\0'; ++i)
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if (str[i] != prefix[i])
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return 0;
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return 1;
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}
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int
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ends_with(const char *str, const char *sufx)
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{
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size_t i, j;
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i = strlen(str);
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j = strlen(sufx);
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if (j > i)
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return 0;
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i -= j;
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for (j = 0; str[i] != '\0'; i++, j++)
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if (str[i] != sufx[j])
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return 0;
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return 1;
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}
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ssize_t
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filesize(int fd)
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{
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ssize_t len;
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if ((len = lseek(fd, 0, SEEK_END)) == -1)
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return -1;
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if (lseek(fd, 0, SEEK_SET) == -1)
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return -1;
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return len;
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}
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char *
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absolutify_path(const char *path)
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{
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char *wd, *r;
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if (*path == '/')
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return strdup(path);
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wd = getcwd(NULL, 0);
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if (asprintf(&r, "%s/%s", wd, path) == -1)
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fatal("asprintf: %s", strerror(errno));
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free(wd);
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return r;
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}
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void
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yyerror(const char *msg)
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{
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goterror = 1;
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fprintf(stderr, "%d: %s\n", yylineno, msg);
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}
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int
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parse_portno(const char *p)
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{
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const char *errstr;
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int n;
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n = strtonum(p, 0, UINT16_MAX, &errstr);
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if (errstr != NULL)
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errx(1, "port number is %s: %s", errstr, p);
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return n;
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}
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void
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parse_conf(const char *path)
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{
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if ((yyin = fopen(path, "r")) == NULL)
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fatal("cannot open config %s", path);
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yyparse();
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fclose(yyin);
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if (goterror)
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exit(1);
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}
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void
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load_vhosts(struct tls_config *tlsconf)
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{
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struct vhost *h;
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/* we need to set something, then we can add how many key we want */
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if (tls_config_set_keypair_file(tlsconf, hosts->cert, hosts->key))
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fatal("tls_config_set_keypair_file failed");
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for (h = hosts; h->domain != NULL; ++h) {
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if (tls_config_add_keypair_file(tlsconf, h->cert, h->key) == -1)
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fatal("failed to load the keypair (%s, %s)",
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h->cert, h->key);
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if ((h->dirfd = open(h->dir, O_RDONLY | O_DIRECTORY)) == -1)
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fatal("open %s for domain %s", h->dir, h->domain);
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}
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}
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int
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make_socket(int port, int family)
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{
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int sock, v;
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struct sockaddr_in addr4;
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struct sockaddr_in6 addr6;
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struct sockaddr *addr;
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socklen_t len;
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switch (family) {
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case AF_INET:
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bzero(&addr4, sizeof(addr4));
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addr4.sin_family = family;
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addr4.sin_port = htons(port);
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addr4.sin_addr.s_addr = INADDR_ANY;
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addr = (struct sockaddr*)&addr4;
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len = sizeof(addr4);
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break;
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case AF_INET6:
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bzero(&addr6, sizeof(addr6));
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addr6.sin6_family = AF_INET6;
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addr6.sin6_port = htons(port);
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addr6.sin6_addr = in6addr_any;
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addr = (struct sockaddr*)&addr6;
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len = sizeof(addr6);
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break;
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default:
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/* unreachable */
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abort();
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}
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if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
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fatal("socket: %s", strerror(errno));
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v = 1;
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
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fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
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v = 1;
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
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fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
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mark_nonblock(sock);
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if (bind(sock, addr, len) == -1)
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fatal("bind: %s", strerror(errno));
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if (listen(sock, 16) == -1)
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fatal("listen: %s", strerror(errno));
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return sock;
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}
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int
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listener_main()
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{
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int sock4, sock6;
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struct tls *ctx = NULL;
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struct tls_config *tlsconf;
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load_default_mime(&conf.mime);
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if ((tlsconf = tls_config_new()) == NULL)
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fatal("tls_config_new");
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/* optionally accept client certs, but don't try to verify them */
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tls_config_verify_client_optional(tlsconf);
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tls_config_insecure_noverifycert(tlsconf);
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if (tls_config_set_protocols(tlsconf, conf.protos) == -1)
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fatal("tls_config_set_protocols");
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if ((ctx = tls_server()) == NULL)
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fatal("tls_server failure");
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load_vhosts(tlsconf);
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if (tls_configure(ctx, tlsconf) == -1)
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fatal("tls_configure: %s", tls_error(ctx));
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if (!conf.foreground && daemon(0, 1) == -1)
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exit(1);
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sock4 = make_socket(conf.port, AF_INET);
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sock6 = -1;
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if (conf.ipv6)
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sock6 = make_socket(conf.port, AF_INET6);
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sandbox();
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loop(ctx, sock4, sock6);
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return 0;
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}
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void
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usage(const char *me)
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{
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fprintf(stderr,
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"USAGE: %s [-n] [-c config] | [-6fh] [-C cert] [-d root] [-K key] "
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"[-p port] [-x cgi-bin]\n",
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me);
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}
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void
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init_config(void)
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{
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size_t i;
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bzero(hosts, sizeof(hosts));
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for (i = 0; i < HOSTSLEN; ++i)
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hosts[i].dirfd = -1;
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conf.foreground = 1;
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conf.port = 1965;
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conf.ipv6 = 0;
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conf.protos = TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3;
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init_mime(&conf.mime);
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}
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int
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main(int argc, char **argv)
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{
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int ch, p[2];
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const char *config_path = NULL;
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int conftest = 0;
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while ((ch = getopt(argc, argv, "6C:c:d:fhK:np:x:")) != -1) {
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switch (ch) {
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case '6':
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conf.ipv6 = 1;
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break;
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case 'C':
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hosts[0].cert = optarg;
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break;
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case 'c':
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config_path = optarg;
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break;
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case 'd':
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free((char*)hosts[0].dir);
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if ((hosts[0].dir = absolutify_path(optarg)) == NULL)
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fatal("absolutify_path");
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break;
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case 'f':
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conf.foreground = 1;
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break;
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case 'h':
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usage(*argv);
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return 0;
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case 'K':
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hosts[0].key = optarg;
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break;
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case 'n':
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conftest = 1;
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break;
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case 'p':
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conf.port = parse_portno(optarg);
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break;
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case 'x':
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/* drop the starting / (if any) */
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if (*optarg == '/')
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optarg++;
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hosts[0].cgi = optarg;
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break;
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default:
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usage(*argv);
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return 1;
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}
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}
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if (config_path != NULL) {
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if (hosts[0].cert != NULL || hosts[0].key != NULL ||
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hosts[0].dir != NULL)
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fatal("can't specify options in conf mode");
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parse_conf(config_path);
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} else {
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if (hosts[0].cert == NULL || hosts[0].key == NULL ||
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hosts[0].dir == NULL)
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fatal("missing cert, key or root directory to serve");
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hosts[0].domain = "*";
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}
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if (conftest) {
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puts("config OK");
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return 0;
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}
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signal(SIGPIPE, SIG_IGN);
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signal(SIGCHLD, SIG_IGN);
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#ifdef SIGINFO
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signal(SIGINFO, sig_handler);
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#endif
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signal(SIGUSR2, sig_handler);
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if (!conf.foreground) {
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signal(SIGHUP, SIG_IGN);
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if (daemon(1, 1) == -1)
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fatal("daemon: %s", strerror(errno));
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}
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if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, p) == -1)
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fatal("socketpair: %s", strerror(errno));
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switch (fork()) {
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case -1:
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fatal("fork: %s", strerror(errno));
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case 0: /* child */
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close(p[0]);
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exfd = p[1];
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listener_main();
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_exit(0);
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default: /* parent */
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close(p[1]);
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return executor_main(p[0]);
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}
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}
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