tTLS: use wrapper functions - sacc - sacc (saccomys): simple gopher client.
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---
(DIR) commit 5a5611b3293eaac0b26832a54b845c6822736b65
(DIR) parent e3535c1405eac56a658886023b057944b4b91bc0
(HTM) Author: Quentin Rameau <quinq@fifth.space>
Date: Sat, 10 Apr 2021 15:56:05 +0200
TLS: use wrapper functions
Diffstat:
M Makefile | 8 ++++----
M config.mk | 12 ++++++++----
A io.h | 17 +++++++++++++++++
A io_clr.c | 63 +++++++++++++++++++++++++++++++
A io_tls.c | 129 +++++++++++++++++++++++++++++++
M sacc.c | 173 ++++++++-----------------------
6 files changed, 264 insertions(+), 138 deletions(-)
---
(DIR) diff --git a/Makefile b/Makefile
t@@ -6,7 +6,7 @@ include config.mk
BIN = sacc
MAN = $(BIN).1
-OBJ = $(BIN:=.o) ui_$(UI).o
+OBJ = $(BIN:=.o) ui_$(UI).o io_$(IO).o
all: $(BIN)
t@@ -14,9 +14,9 @@ config.h:
cp config.def.h config.h
$(BIN): $(OBJ)
- $(CC) $(OBJ) $(LDFLAGS) $(LIBS) $(TLSLIBS) -o $@
+ $(CC) $(OBJ) $(LDFLAGS) $(IOLIBS) $(LIBS) -o $@
-$(OBJ): config.h config.mk common.h
+$(OBJ): config.h config.mk common.h io.h
clean:
rm -f $(BIN) $(OBJ)
t@@ -33,7 +33,7 @@ uninstall:
# Stock FLAGS
SACCCFLAGS = -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=700 -D_BSD_SOURCE -D_GNU_SOURCE \
- $(TLSCFLAGS) $(CFLAGS)
+ $(IOCFLAGS) $(CFLAGS)
.c.o:
$(CC) $(SACCCFLAGS) -c $<
(DIR) diff --git a/config.mk b/config.mk
t@@ -9,10 +9,14 @@ MANDIR = $(PREFIX)/share/man/man1
UI=ti
LIBS=-lcurses
+# IO type
+# clr (clear)
+#IO = clr
+# tls (Transport Layer Security)
+IO = tls
+IOLIBS = -ltls
+IOCFLAGS = -DUSE_TLS
+
# Define NEED_ASPRINTF and/or NEED_STRCASESTR in your cflags if your system does
# not provide asprintf() or strcasestr(), respectively.
#CFLAGS = -DNEED_ASPRINTF -DNEED_STRCASESTR
-
-# gophers (gopher over TLS) support
-TLSCFLAGS = -DUSE_TLS
-TLSLIBS = -ltls
(DIR) diff --git a/io.h b/io.h
t@@ -0,0 +1,17 @@
+#include <netdb.h>
+
+struct cnx {
+#ifdef USE_TLS
+ struct tls *tls;
+#endif
+ int sock;
+};
+
+extern int tls;
+
+extern int (*ioclose)(struct cnx *);
+extern int (*ioconnect)(struct cnx *, struct addrinfo *, const char *);
+extern void (*ioconnerr)(struct cnx *, const char *, const char *, int);
+extern char *(*ioparseurl)(char *);
+extern ssize_t (*ioread)(struct cnx *, void *, size_t);
+extern ssize_t (*iowrite)(struct cnx *, void *, size_t);
(DIR) diff --git a/io_clr.c b/io_clr.c
t@@ -0,0 +1,63 @@
+#include <string.h>
+#include <unistd.h>
+#include <netdb.h>
+
+#include <sys/socket.h>
+
+#include "common.h"
+#include "io.h"
+
+static int
+close_clr(struct cnx *c)
+{
+ return close(c->sock);
+}
+
+static int
+connect_clr(struct cnx *c, struct addrinfo *ai, const char *host)
+{
+ return connect(c->sock, ai->ai_addr, ai->ai_addrlen);
+}
+
+static void
+connerr_clr(struct cnx *c, const char *host, const char *port, int err)
+{
+ if (c->sock == -1)
+ diag("Can't open socket: %s", strerror(err));
+ else
+ diag("Can't connect to: %s:%s: %s", host, port, strerror(err));
+}
+
+static char *
+parseurl_clr(char *url)
+{
+ char *p;
+
+ if (p = strstr(url, "://")) {
+ if (strncmp(url, "gopher", p - url))
+ die("Protocol not supported: %.*s", p - url, url);
+
+ url = p + 3;
+ }
+
+ return url;
+}
+
+static ssize_t
+read_clr(struct cnx *c, void *buf, size_t bs)
+{
+ return read(c->sock, buf, bs);
+}
+
+static ssize_t
+write_clr(struct cnx *c, void *buf, size_t bs)
+{
+ return write(c->sock, buf, bs);
+}
+
+int (*ioclose)(struct cnx *) = close_clr;
+int (*ioconnect)(struct cnx *, struct addrinfo *, const char *) = connect_clr;
+void (*ioconnerr)(struct cnx *, const char *, const char *, int) = connerr_clr;
+char *(*ioparseurl)(char *) = parseurl_clr;
+ssize_t (*ioread)(struct cnx *, void *, size_t) = read_clr;
+ssize_t (*iowrite)(struct cnx *, void *, size_t) = write_clr;
(DIR) diff --git a/io_tls.c b/io_tls.c
t@@ -0,0 +1,129 @@
+#include <string.h>
+#include <unistd.h>
+#include <netdb.h>
+
+#include <sys/socket.h>
+
+#include <tls.h>
+
+#include "common.h"
+#include "io.h"
+
+int tls;
+
+static int
+close_tls(struct cnx *c)
+{
+ int r;
+
+ if (tls) {
+ if (c->tls) {
+ do {
+ r = tls_close(c->tls);
+ } while (r == TLS_WANT_POLLIN || r == TLS_WANT_POLLOUT);
+ }
+ tls_free(c->tls);
+ }
+
+ return close(c->sock);
+}
+
+static int
+connect_tls(struct cnx *c, struct addrinfo *ai, const char *host)
+{
+ struct tls *t;
+ int s;
+
+ c->tls = NULL;
+ s = c->sock;
+
+ if (connect(s, ai->ai_addr, ai->ai_addrlen) == -1)
+ return -1;
+
+ if (tls) {
+ if ((t = tls_client()) == NULL)
+ return -1;
+ if (tls_connect_socket(t, s, host) == -1)
+ return -1;
+
+ c->tls = t;
+ }
+
+ return 0;
+}
+
+static void
+connerr_tls(struct cnx *c, const char *host, const char *port, int err)
+{
+ if (c->sock == -1) {
+ diag("Can't open socket: %s", strerror(err));
+ } else {
+ if (tls && c->tls) {
+ diag("Can't establish TLS with \"%s\": %s",
+ host, tls_error(c->tls));
+ } else {
+ diag("Can't connect to: %s:%s: %s", host, port,
+ strerror(err));
+ }
+ }
+}
+
+static char *
+parseurl_tls(char *url)
+{
+ char *p;
+
+ if (p = strstr(url, "://")) {
+ if (!strncmp(url, "gopher", p - url)) {
+ if (tls)
+ diag("Switching from gophers to gopher");
+ tls = 0;
+ } else if (!strncmp(url, "gophers", p - url)) {
+ tls = 1;
+ } else {
+ die("Protocol not supported: %.*s", p - url, url);
+ }
+ url = p + 3;
+ }
+
+ return url;
+}
+
+static ssize_t
+read_tls(struct cnx *c, void *buf, size_t bs)
+{
+ ssize_t n;
+
+ if (tls && c->tls) {
+ do {
+ n = tls_read(c->tls, buf, bs);
+ } while (n == TLS_WANT_POLLIN || n == TLS_WANT_POLLOUT);
+ } else {
+ n = read(c->sock, buf, bs);
+ }
+
+ return n;
+}
+
+static ssize_t
+write_tls(struct cnx *c, void *buf, size_t bs)
+{
+ ssize_t n;
+
+ if (tls) {
+ do {
+ n = tls_write(c->tls, buf, bs);
+ } while (n == TLS_WANT_POLLIN || n == TLS_WANT_POLLOUT);
+ } else {
+ n = write(c->sock, buf, bs);
+ }
+
+ return n;
+}
+
+int (*ioclose)(struct cnx *) = close_tls;
+int (*ioconnect)(struct cnx *, struct addrinfo *, const char *) = connect_tls;
+void (*ioconnerr)(struct cnx *, const char *, const char *, int) = connerr_tls;
+char *(*ioparseurl)(char *) = parseurl_tls;
+ssize_t (*ioread)(struct cnx *, void *, size_t) = read_tls;
+ssize_t (*iowrite)(struct cnx *, void *, size_t) = write_tls;
(DIR) diff --git a/sacc.c b/sacc.c
t@@ -18,26 +18,15 @@
#include <sys/types.h>
#include <sys/wait.h>
-#ifdef USE_TLS
-#include <tls.h>
-#endif
-
#include "common.h"
+#include "io.h"
#include "config.h"
-struct cnx {
-#ifdef USE_TLS
- struct tls *tls;
-#endif
- int sock;
-};
-
static char *mainurl;
static Item *mainentry;
static int devnullfd;
static int parent = 1;
static int interactive;
-static int tls;
static void (*diag)(char *fmt, ...);
t@@ -429,7 +418,7 @@ molddiritem(char *raw)
}
static char *
-getrawitem(struct cnx *cnx)
+getrawitem(struct cnx *c)
{
char *raw, *buf;
size_t bn, bs;
t@@ -458,17 +447,7 @@ getrawitem(struct cnx *cnx)
bs = BUFSIZ;
}
-#ifdef USE_TLS
- if (tls) {
- do {
- n = tls_read(cnx->tls, buf, bs);
- } while (n == TLS_WANT_POLLIN || n == TLS_WANT_POLLOUT);
- } else
-#endif
- {
- n = read(cnx->sock, buf, bs);
- }
- } while (n > 0);
+ } while ((n = ioread(c, buf, bs)) > 0);
*buf = '\0';
t@@ -481,7 +460,7 @@ getrawitem(struct cnx *cnx)
}
static int
-sendselector(struct cnx *cnx, const char *selector)
+sendselector(struct cnx *c, const char *selector)
{
char *msg, *p;
size_t ln;
t@@ -491,21 +470,10 @@ sendselector(struct cnx *cnx, const char *selector)
msg = p = xmalloc(ln);
snprintf(msg, ln--, "%s\r\n", selector);
- do {
-#ifdef USE_TLS
- if (tls) {
- do {
- n = tls_write(cnx->tls, p, ln);
- } while (n == TLS_WANT_POLLIN || n == TLS_WANT_POLLOUT);
- } else
-#endif
- {
- n = write(cnx->sock, p, ln);
- }
-
+ while ((n = iowrite(c, p, ln)) > 0) {
ln -= n;
p += n;
- } while (n > 0);
+ };
free(msg);
if (n == -1)
t@@ -514,20 +482,8 @@ sendselector(struct cnx *cnx, const char *selector)
return n;
}
-static void
-closecnx(struct cnx *cnx)
-{
-#ifdef USE_TLS
- if (tls) {
- tls_close(cnx->tls);
- tls_free(cnx->tls);
- }
-#endif
- close(cnx->sock);
-}
-
static int
-connectto(const char *host, const char *port, struct cnx *cnx)
+connectto(const char *host, const char *port, struct cnx *c)
{
sigset_t set, oset;
static const struct addrinfo hints = {
t@@ -536,7 +492,7 @@ connectto(const char *host, const char *port, struct cnx *cnx)
.ai_protocol = IPPROTO_TCP,
};
struct addrinfo *addrs, *addr;
- int r, sock = -1;
+ int r, err;
sigemptyset(&set);
sigaddset(&set, SIGWINCH);
t@@ -548,86 +504,54 @@ connectto(const char *host, const char *port, struct cnx *cnx)
goto err;
}
+ r = -1;
for (addr = addrs; addr; addr = addr->ai_next) {
- if ((sock = socket(addr->ai_family, addr->ai_socktype,
- addr->ai_protocol)) == -1)
- continue;
-
- r = connect(sock, addr->ai_addr, addr->ai_addrlen);
- if (r == -1) {
- close(sock);
+ if ((c->sock = socket(addr->ai_family, addr->ai_socktype,
+ addr->ai_protocol)) == -1) {
+ err = errno;
continue;
}
-#ifdef USE_TLS
- if (tls) {
- if ((cnx->tls = tls_client()) == NULL) {
- diag("Can't establish TLS with \"%s\": %s",
- host, tls_error(cnx->tls));
- close(sock);
- continue;
- }
- r = tls_connect_socket(cnx->tls, sock, host);
- }
-#endif
- break;
- }
- freeaddrinfo(addrs);
+ if ((r = ioconnect(c, addr, host)) == 0)
+ break;
- if (sock == -1) {
- diag("Can't open socket: %s", strerror(errno));
- goto err;
- }
- if (r == -1) {
- diag("Can't connect to: %s:%s: %s",
- host, port, strerror(errno));
- goto err;
+ err = errno;
+ close(c->sock);
}
- sigprocmask(SIG_SETMASK, &oset, NULL);
-
- cnx->sock = sock;
+ freeaddrinfo(addrs);
- return 0;
+ if (r == -1)
+ ioconnerr(c, host, port, err);
err:
sigprocmask(SIG_SETMASK, &oset, NULL);
- return -1;
+
+ return r;
}
static int
download(Item *item, int dest)
{
char buf[BUFSIZ];
- struct cnx cnx;
+ struct cnx c;
ssize_t r, w;
- int src;
- if (!item->tag) {
- if (connectto(item->host, item->port, &cnx) == -1 ||
- sendselector(&cnx, item->selector) == -1)
+ if (item->tag == NULL) {
+ if (connectto(item->host, item->port, &c) == -1 ||
+ sendselector(&c, item->selector) == -1)
+ return 0;
+ } else {
+ if ((c.sock = open(item->tag, O_RDONLY)) == -1) {
+ printf("Can't open source file %s: %s",
+ item->tag, strerror(errno));
+ errno = 0;
return 0;
- src = cnx.sock;
- } else if ((src = open(item->tag, O_RDONLY)) == -1) {
- printf("Can't open source file %s: %s",
- item->tag, strerror(errno));
- errno = 0;
- return 0;
- }
-
- for (w = 0; w != -1;) {
-#ifdef USE_TLS
- if (tls) {
- do {
- r = tls_read(cnx.tls, buf, sizeof(buf));
- } while (r == TLS_WANT_POLLIN || r == TLS_WANT_POLLOUT);
- } else
-#endif
- {
- r = read(src, buf, sizeof(buf));
}
- if (r <= 0)
- break;
+ c.tls = NULL;
+ }
+ w = 0;
+ while ((r = ioread(&c, buf, BUFSIZ)) > 0) {
while ((w = write(dest, buf, r)) > 0)
r -= w;
}
t@@ -638,7 +562,8 @@ download(Item *item, int dest)
errno = 0;
}
- closecnx(&cnx);
+ close(dest);
+ ioclose(&c);
return (r == 0 && w == 0);
}
t@@ -693,15 +618,15 @@ cleanup:
static int
fetchitem(Item *item)
{
- struct cnx cnx;
+ struct cnx c;
char *raw;
- if (connectto(item->host, item->port, &cnx) == -1 ||
- sendselector(&cnx, item->selector) == -1)
+ if (connectto(item->host, item->port, &c) == -1 ||
+ sendselector(&c, item->selector) == -1)
return 0;
- raw = getrawitem(&cnx);
- closecnx(&cnx);
+ raw = getrawitem(&c);
+ ioclose(&c);
if (raw == NULL || !*raw) {
diag("Empty response from server");
t@@ -985,19 +910,7 @@ moldentry(char *url)
char *p, *host = url, *port = "70", *gopherpath = "1";
int parsed, ipv6;
- if (p = strstr(url, "://")) {
- if (strncmp(url, "gopher", p - url) == 0) {
- if (tls) {
- diag("Switching from gophers to gopher");
- tls = 0;
- }
- } else if (strncmp(url, "gophers", p - url) == 0) {
- tls = 1;
- } else {
- die("Protocol not supported: %.*s", p - url, url);
- }
- host = p + 3;
- }
+ host = ioparseurl(url);
if (*host == '[') {
ipv6 = 1;