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4b9eb19c68
We'll assert if we try: better to truncate, trace a warning, and let the recipient complain about a truncated message, This is particularly an issue when we're sending encapsulated messages; this avoids extra checks in the caller. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
#include "status.h"
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#include "utils.h"
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#include "wire/wire.h"
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#include "wire/wire_sync.h"
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#include <assert.h>
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#include <ccan/breakpoint/breakpoint.h>
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#include <ccan/endian/endian.h>
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#include <ccan/err/err.h>
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#include <ccan/fdpass/fdpass.h>
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#include <ccan/read_write_all/read_write_all.h>
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#include <ccan/tal/str/str.h>
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#include <stdarg.h>
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static int status_fd = -1;
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const void *trc;
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void status_setup(int fd)
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{
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status_fd = fd;
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trc = tal_tmpctx(NULL);
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}
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static bool too_large(size_t len, int type)
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{
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if (len > 65535) {
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status_trace("About to truncate msg %i from %zu bytes",
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type, len);
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return true;
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}
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return false;
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}
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void status_send(const u8 *p)
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{
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const u8 *msg = p;
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assert(status_fd >= 0);
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if (too_large(tal_count(p), fromwire_peektype(p)))
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msg = tal_dup_arr(p, u8, p, 65535, 0);
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if (!wire_sync_write(status_fd, msg))
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err(1, "Writing out status len %zu", tal_count(msg));
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tal_free(p);
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}
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void status_send_fd(int fd)
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{
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assert(status_fd >= 0);
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assert(fd >= 0);
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if (!fdpass_send(status_fd, fd))
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err(1, "Writing out status fd %i", fd);
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close(fd);
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}
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static void status_send_with_hdr(u16 type, const void *p, size_t len)
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{
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be16 be_type, be_len;
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if (too_large(len + sizeof(be_type), type))
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len = 65535 - sizeof(be_type);
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be_type = cpu_to_be16(type);
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be_len = cpu_to_be16(len + sizeof(be_type));
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assert(status_fd >= 0);
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assert(be16_to_cpu(be_len) == len + sizeof(be_type));
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if (!write_all(status_fd, &be_len, sizeof(be_len))
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|| !write_all(status_fd, &be_type, sizeof(be_type))
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|| !write_all(status_fd, p, len))
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err(1, "Writing out status %u len %zu", type, len);
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}
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void status_trace(const char *fmt, ...)
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{
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va_list ap;
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char *str;
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va_start(ap, fmt);
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str = tal_vfmt(NULL, fmt, ap);
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status_send_with_hdr(STATUS_TRACE, str, strlen(str));
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tal_free(str);
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va_end(ap);
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/* Free up any temporary children. */
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tal_free(trc);
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trc = tal_tmpctx(NULL);
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}
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void status_failed(u16 code, const char *fmt, ...)
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{
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va_list ap;
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char *str;
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breakpoint();
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assert(code & STATUS_FAIL);
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va_start(ap, fmt);
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str = tal_vfmt(NULL, fmt, ap);
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status_send_with_hdr(code, str, strlen(str));
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va_end(ap);
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exit(0x80 | (code & 0xFF));
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}
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