diff options
Diffstat (limited to 'src/sockwrap.c')
| -rw-r--r-- | src/sockwrap.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/src/sockwrap.c b/src/sockwrap.c new file mode 100644 index 0000000..0d18fed --- /dev/null +++ b/src/sockwrap.c @@ -0,0 +1,224 @@ +/* $Id$ */ + +/*** + This file is part of libnewmail + + libnewmail 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 2 of the License, or + (at your option) any later version. + + libnewmail 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 libnewmail; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA +***/ + +#include <unistd.h> +#include <stdlib.h> +#include <sys/socket.h> +#include <netdb.h> +#include <netinet/in.h> +#include <gnutls/gnutls.h> +#include <string.h> +#include <stdio.h> + +#include "sockwrap.h" +#include "util.h" + +struct sockwrap { + int fd; + gnutls_session tls; + gnutls_certificate_credentials tls_cred; + int use_tls; +}; + +int _global_tls = 0; + +static void _atexit(void) { + if (_global_tls) + gnutls_global_deinit(); + + _global_tls = 0; +} + +int sockwrap_readln(struct sockwrap *s, char *ln, int max) { + char *p = ln; + + while (max > 1) { + ssize_t r; + + if (!s->use_tls) { + if ((r = read(s->fd, p, 1)) <= 0) + return -1; + } else { + if ((r = gnutls_record_recv(s->tls, p, 1)) < 0) + return -1; + } + + max -= r; + + if (*p == '\n') { + p += r; + break; + } + + p +=r; + } + + *p = 0; + + //ßfprintf(stderr, "Read %i bytes\n", p-ln); + + return 0; +} + +int sockwrap_writeln(struct sockwrap *s, char *ln) { + char *p; + ssize_t n; + + p = ln; + n = strlen(p); + while(n > 0) { + ssize_t r; + if (!s->use_tls) { + if ((r = write(s->fd, p, n)) <= 0) + return -1; + } else { + if ((r = gnutls_record_send(s->tls, ln, n)) <= 0) + return -1; + } + + n -= r; + p += r; + } + + return 0; +} + +struct sockwrap* sockwrap(char *host, int port, int use_tls) { + struct sockwrap* s = NULL; + struct hostent *he; + struct sockaddr_in sa; + + if (!(s = malloc(sizeof(struct sockwrap)))) { + nm_error(NM_ERROR_MEMORY, NULL); + goto finish; + } + + s->fd = -1; + s->tls = 0; + s->tls_cred = 0; + s->use_tls = use_tls; + + if ((s->fd = socket(PF_INET, SOCK_STREAM, 0)) < 0) + goto finish; + + if (!(he = gethostbyname(host))) { + nm_error(NM_ERROR_SERVNOTFOUND|NM_ERROR_SYSTEM, NULL); + goto finish; + } + + sa.sin_family = AF_INET; + sa.sin_port = htons(port); + sa.sin_addr = *((struct in_addr *) he->h_addr); + + if (connect(s->fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) { + nm_error(NM_ERROR_SERVFAIL|NM_ERROR_SYSTEM, NULL); + goto finish; + } + + if (use_tls) { + int ret; + + if (!_global_tls) { + if ((ret = gnutls_global_init()) != 0) { + nm_error(NM_ERROR_INTERNAL, gnutls_strerror(ret)); + goto finish; + } + + _global_tls = 1; + atexit(_atexit); + } + + if ((ret = gnutls_init(&s->tls, GNUTLS_CLIENT)) != 0) { + nm_error(NM_ERROR_INTERNAL, gnutls_strerror(ret)); + goto finish; + } + + if ((ret = gnutls_set_default_priority(s->tls)) != 0) { + nm_error(NM_ERROR_INTERNAL, gnutls_strerror(ret)); + goto finish; + } + + if ((ret = gnutls_certificate_allocate_sc(&s->tls_cred)) < 0) { + nm_error(NM_ERROR_INTERNAL, gnutls_strerror(ret)); + goto finish; + } + + if ((ret = gnutls_cred_set(s->tls, GNUTLS_CRD_CERTIFICATE, s->tls_cred)) < 0) { + nm_error(NM_ERROR_INTERNAL, gnutls_strerror(ret)); + goto finish; + } + + gnutls_transport_set_ptr(s->tls, (gnutls_transport_ptr) s->fd); + + if ((ret = gnutls_handshake(s->tls)) != 0) { + nm_error(NM_ERROR_INTERNAL, gnutls_strerror(ret)); + goto finish; + } + } + + return s; + +finish: + + if (s && s->use_tls) { + if (s->tls && s->tls_cred) + gnutls_bye(s->tls, GNUTLS_SHUT_RDWR); + if (s->tls_cred) + gnutls_certificate_free_credentials(s->tls_cred); + if (s->tls) + gnutls_deinit(s->tls); + + gnutls_global_deinit(); + } + + if (s && s->fd >= 0) { + shutdown(s->fd, SHUT_RDWR); + close(s->fd); + } + + free(s); + + + return NULL; +} + + +void sockwrap_close(struct sockwrap *s) { + if (!s) + return; + + if (s->use_tls) { + if (s->tls && s->tls_cred) + gnutls_bye(s->tls, GNUTLS_SHUT_RDWR); + if (s->tls_cred) + gnutls_certificate_free_credentials(s->tls_cred); + if (s->tls) + gnutls_deinit(s->tls); + + } + + if (s->fd >= 0) { + shutdown(s->fd, SHUT_RDWR); + close(s->fd); + } + + free(s); +} |