X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-crash%2Flttng-crash.cpp;fp=src%2Fbin%2Flttng-crash%2Flttng-crash.cpp;h=3f5ea3759a668a8dc5d6e43e58b19a8471c2766d;hp=0000000000000000000000000000000000000000;hb=aa4e4813f3410c866cf8dbc42f6eaa038d704a22;hpb=ac497a37018f3c253d2e50397294f58d33f7f24f diff --git a/src/bin/lttng-crash/lttng-crash.cpp b/src/bin/lttng-crash/lttng-crash.cpp new file mode 100644 index 000000000..3f5ea3759 --- /dev/null +++ b/src/bin/lttng-crash/lttng-crash.cpp @@ -0,0 +1,1269 @@ +/* + * Copyright (C) 2011 David Goulet + * Copyright (C) 2014 Mathieu Desnoyers + * + * SPDX-License-Identifier: GPL-2.0-only + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#define COPY_BUFLEN 4096 +#define RB_CRASH_DUMP_ABI_LEN 32 + +#define RB_CRASH_DUMP_ABI_MAGIC_LEN 16 + +/* + * The 128-bit magic number is xor'd in the process data so it does not + * cause a false positive when searching for buffers by scanning memory. + * The actual magic number is: + * 0x17, 0x7B, 0xF1, 0x77, 0xBF, 0x17, 0x7B, 0xF1, + * 0x77, 0xBF, 0x17, 0x7B, 0xF1, 0x77, 0xBF, 0x17, + */ +#define RB_CRASH_DUMP_ABI_MAGIC_XOR \ + { \ + 0x17 ^ 0xFF, 0x7B ^ 0xFF, 0xF1 ^ 0xFF, 0x77 ^ 0xFF, \ + 0xBF ^ 0xFF, 0x17 ^ 0xFF, 0x7B ^ 0xFF, 0xF1 ^ 0xFF, \ + 0x77 ^ 0xFF, 0xBF ^ 0xFF, 0x17 ^ 0xFF, 0x7B ^ 0xFF, \ + 0xF1 ^ 0xFF, 0x77 ^ 0xFF, 0xBF ^ 0xFF, 0x17 ^ 0xFF, \ + } + +static const char *help_msg = +#ifdef LTTNG_EMBED_HELP +#include +#else +NULL +#endif +; + +/* + * Non-static to ensure the compiler does not optimize away the xor. + */ +uint8_t lttng_crash_expected_magic_xor[] = RB_CRASH_DUMP_ABI_MAGIC_XOR; + +#define RB_CRASH_ENDIAN 0x1234 +#define RB_CRASH_ENDIAN_REVERSE 0x3412 + +enum lttng_crash_type { + LTTNG_CRASH_TYPE_UST = 0, + LTTNG_CRASH_TYPE_KERNEL = 1, +}; + +/* LTTng ring buffer defines (copied) */ + +#define HALF_ULONG_BITS(wl) (((wl) * CHAR_BIT) >> 1) + +#define SB_ID_OFFSET_SHIFT(wl) (HALF_ULONG_BITS(wl) + 1) +#define SB_ID_OFFSET_COUNT(wl) (1UL << SB_ID_OFFSET_SHIFT(wl)) +#define SB_ID_OFFSET_MASK(wl) (~(SB_ID_OFFSET_COUNT(wl) - 1)) +/* + * Lowest bit of top word half belongs to noref. Used only for overwrite mode. + */ +#define SB_ID_NOREF_SHIFT(wl) (SB_ID_OFFSET_SHIFT(wl) - 1) +#define SB_ID_NOREF_COUNT(wl) (1UL << SB_ID_NOREF_SHIFT(wl)) +#define SB_ID_NOREF_MASK(wl) SB_ID_NOREF_COUNT(wl) +/* + * In overwrite mode: lowest half of word is used for index. + * Limit of 2^16 subbuffers per buffer on 32-bit, 2^32 on 64-bit. + * In producer-consumer mode: whole word used for index. + */ +#define SB_ID_INDEX_SHIFT(wl) 0 +#define SB_ID_INDEX_COUNT(wl) (1UL << SB_ID_INDEX_SHIFT(wl)) +#define SB_ID_INDEX_MASK(wl) (SB_ID_NOREF_COUNT(wl) - 1) + +enum rb_modes { + RING_BUFFER_OVERWRITE = 0, /* Overwrite when buffer full */ + RING_BUFFER_DISCARD = 1, /* Discard when buffer full */ +}; + +struct crash_abi_unknown { + uint8_t magic[RB_CRASH_DUMP_ABI_MAGIC_LEN]; + uint64_t mmap_length; /* Overall length of crash record */ + uint16_t endian; /* + * { 0x12, 0x34 }: big endian + * { 0x34, 0x12 }: little endian + */ + uint16_t major; /* Major number. */ + uint16_t minor; /* Minor number. */ + uint8_t word_size; /* Word size (bytes). */ + uint8_t layout_type; /* enum lttng_crash_layout */ +} __attribute__((packed)); + +struct crash_abi_0_0 { + struct crash_abi_unknown parent; + + struct { + uint32_t prod_offset; + uint32_t consumed_offset; + uint32_t commit_hot_array; + uint32_t commit_hot_seq; + uint32_t buf_wsb_array; + uint32_t buf_wsb_id; + uint32_t sb_array; + uint32_t sb_array_shmp_offset; + uint32_t sb_backend_p_offset; + uint32_t content_size; + uint32_t packet_size; + } __attribute__((packed)) offset; + struct { + uint8_t prod_offset; + uint8_t consumed_offset; + uint8_t commit_hot_seq; + uint8_t buf_wsb_id; + uint8_t sb_array_shmp_offset; + uint8_t sb_backend_p_offset; + uint8_t content_size; + uint8_t packet_size; + } __attribute__((packed)) length; + struct { + uint32_t commit_hot_array; + uint32_t buf_wsb_array; + uint32_t sb_array; + } __attribute__((packed)) stride; + + uint64_t buf_size; /* Size of the buffer */ + uint64_t subbuf_size; /* Sub-buffer size */ + uint64_t num_subbuf; /* Number of sub-buffers for writer */ + uint32_t mode; /* Buffer mode: 0: overwrite, 1: discard */ +} __attribute__((packed)); + +struct lttng_crash_layout { + struct { + int prod_offset, consumed_offset, + commit_hot_array, commit_hot_seq, + buf_wsb_array, buf_wsb_id, + sb_array, sb_array_shmp_offset, + sb_backend_p_offset, content_size, + packet_size; + } offset; + struct { + int prod_offset, consumed_offset, + commit_hot_seq, buf_wsb_id, + sb_array_shmp_offset, sb_backend_p_offset, + content_size, packet_size; + } length; + struct { + int commit_hot_array, buf_wsb_array, sb_array; + } stride; + + int reverse_byte_order; + int word_size; + + uint64_t mmap_length; /* Length of crash record */ + uint64_t buf_size; /* Size of the buffer */ + uint64_t subbuf_size; /* Sub-buffer size */ + uint64_t num_subbuf; /* Number of sub-buffers for writer */ + uint32_t mode; /* Buffer mode: 0: overwrite, 1: discard */ +}; + +/* Variables */ +static const char *progname; +static char *opt_viewer_path = NULL; +static char *opt_output_path = NULL; + +static char *the_input_path; + +int lttng_opt_quiet, lttng_opt_verbose, lttng_opt_mi; + +enum { + OPT_DUMP_OPTIONS, +}; + +/* Getopt options. No first level command. */ +static struct option long_options[] = { + { "version", 0, NULL, 'V' }, + { "help", 0, NULL, 'h' }, + { "verbose", 0, NULL, 'v' }, + { "viewer", 1, NULL, 'e' }, + { "extract", 1, NULL, 'x' }, + { "list-options", 0, NULL, OPT_DUMP_OPTIONS }, + { NULL, 0, NULL, 0 }, +}; + +static void usage(void) +{ + int ret = utils_show_help(1, "lttng-crash", help_msg); + + if (ret) { + ERR("Cannot show --help for `lttng-crash`"); + perror("exec"); + exit(EXIT_FAILURE); + } +} + +static void version(FILE *ofp) +{ + fprintf(ofp, "%s (LTTng Crash Trace Viewer) " VERSION " - " VERSION_NAME + "%s%s\n", + progname, + GIT_VERSION[0] == '\0' ? "" : " - " GIT_VERSION, + EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " EXTRA_VERSION_NAME); +} + +/* + * list_options + * + * List options line by line. This is mostly for bash auto completion and to + * avoid difficult parsing. + */ +static void list_options(FILE *ofp) +{ + int i = 0; + struct option *option = NULL; + + option = &long_options[i]; + while (option->name != NULL) { + fprintf(ofp, "--%s\n", option->name); + + if (isprint(option->val)) { + fprintf(ofp, "-%c\n", option->val); + } + + i++; + option = &long_options[i]; + } +} + +/* + * Parse command line arguments. + * + * Return 0 if OK, else -1 + */ +static int parse_args(int argc, char **argv) +{ + int opt, ret = 0; + + if (argc < 2) { + usage(); + exit(EXIT_FAILURE); + } + + while ((opt = getopt_long(argc, argv, "+Vhve:x:", long_options, NULL)) != -1) { + switch (opt) { + case 'V': + version(stdout); + ret = 1; + goto end; + case 'h': + usage(); + ret = 1; + goto end; + case 'v': + /* There is only 3 possible level of verbosity. (-vvv) */ + if (lttng_opt_verbose < 3) { + lttng_opt_verbose += 1; + } + break; + case 'e': + free(opt_viewer_path); + opt_viewer_path = strdup(optarg); + break; + case 'x': + free(opt_output_path); + opt_output_path = strdup(optarg); + break; + case OPT_DUMP_OPTIONS: + list_options(stdout); + ret = 1; + goto end; + default: + ERR("Unknown command-line option"); + goto error; + } + } + + /* No leftovers, or more than one input path, print usage and quit */ + if (argc - optind != 1) { + ERR("Command-line error: Specify exactly one input path"); + goto error; + } + + the_input_path = argv[optind]; +end: + return ret; + +error: + return -1; +} + +static +int copy_file(const char *file_dest, const char *file_src) +{ + int fd_src = -1, fd_dest = -1; + ssize_t readlen, writelen; + char buf[COPY_BUFLEN]; + int ret; + + DBG("Copy metadata file '%s' into '%s'", file_src, file_dest); + + fd_src = open(file_src, O_RDONLY); + if (fd_src < 0) { + PERROR("Error opening %s for reading", file_src); + ret = -errno; + goto error; + } + fd_dest = open(file_dest, O_RDWR | O_CREAT | O_EXCL, + S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); + if (fd_dest < 0) { + PERROR("Error opening %s for writing", file_dest); + ret = -errno; + goto error; + } + + for (;;) { + readlen = lttng_read(fd_src, buf, COPY_BUFLEN); + if (readlen < 0) { + PERROR("Error reading input file"); + ret = -1; + goto error; + } + if (!readlen) { + break; + } + writelen = lttng_write(fd_dest, buf, readlen); + if (writelen < readlen) { + PERROR("Error writing to output file"); + ret = -1; + goto error; + } + } + + ret = 0; +error: + if (fd_src >= 0) { + if (close(fd_src) < 0) { + PERROR("Error closing %s", file_src); + } + } + + if (fd_dest >= 0) { + if (close(fd_dest) < 0) { + PERROR("Error closing %s", file_dest); + } + } + return ret; +} + +static +uint64_t _crash_get_field(const struct lttng_crash_layout *layout, + const char *ptr, size_t size) +{ + switch (size) { + case 1: return *(uint8_t *) ptr; + case 2: if (layout->reverse_byte_order) { + return bswap_16(*(uint16_t *) ptr); + } else { + return *(uint16_t *) ptr; + + } + case 4: if (layout->reverse_byte_order) { + return bswap_32(*(uint32_t *) ptr); + } else { + return *(uint32_t *) ptr; + + } + case 8: if (layout->reverse_byte_order) { + return bswap_64(*(uint64_t *) ptr); + } else { + return *(uint64_t *) ptr; + } + default: + abort(); + return -1; + } + +} + +#define crash_get_field(layout, map, name) \ + _crash_get_field(layout, (map) + (layout)->offset.name, \ + layout->length.name) + +#define crash_get_array_field(layout, map, array_name, idx, field_name) \ + _crash_get_field(layout, \ + (map) + (layout)->offset.array_name \ + + (idx * (layout)->stride.array_name) \ + + (layout)->offset.field_name, \ + (layout)->length.field_name) + +#define crash_get_hdr_raw_field(layout, hdr, name) ((hdr)->name) + +#define crash_get_hdr_field(layout, hdr, name) \ + _crash_get_field(layout, (const char *) &(hdr)->name, \ + sizeof((hdr)->name)) + +#define crash_get_layout(layout, hdr, name) \ + do { \ + (layout)->name = crash_get_hdr_field(layout, hdr, \ + name); \ + DBG("layout.%s = %" PRIu64, #name, \ + (uint64_t) (layout)->name); \ + } while (0) + +static +int get_crash_layout_0_0(struct lttng_crash_layout *layout, + char *map) +{ + const struct crash_abi_0_0 *abi = (const struct crash_abi_0_0 *) map; + + crash_get_layout(layout, abi, offset.prod_offset); + crash_get_layout(layout, abi, offset.consumed_offset); + crash_get_layout(layout, abi, offset.commit_hot_array); + crash_get_layout(layout, abi, offset.commit_hot_seq); + crash_get_layout(layout, abi, offset.buf_wsb_array); + crash_get_layout(layout, abi, offset.buf_wsb_id); + crash_get_layout(layout, abi, offset.sb_array); + crash_get_layout(layout, abi, offset.sb_array_shmp_offset); + crash_get_layout(layout, abi, offset.sb_backend_p_offset); + crash_get_layout(layout, abi, offset.content_size); + crash_get_layout(layout, abi, offset.packet_size); + + crash_get_layout(layout, abi, length.prod_offset); + crash_get_layout(layout, abi, length.consumed_offset); + crash_get_layout(layout, abi, length.commit_hot_seq); + crash_get_layout(layout, abi, length.buf_wsb_id); + crash_get_layout(layout, abi, length.sb_array_shmp_offset); + crash_get_layout(layout, abi, length.sb_backend_p_offset); + crash_get_layout(layout, abi, length.content_size); + crash_get_layout(layout, abi, length.packet_size); + + crash_get_layout(layout, abi, stride.commit_hot_array); + crash_get_layout(layout, abi, stride.buf_wsb_array); + crash_get_layout(layout, abi, stride.sb_array); + + crash_get_layout(layout, abi, buf_size); + crash_get_layout(layout, abi, subbuf_size); + crash_get_layout(layout, abi, num_subbuf); + crash_get_layout(layout, abi, mode); + + return 0; +} + +static +void print_dbg_magic(const uint8_t *magic) +{ + DBG("magic: 0x%X%X%X%X%X%X%X%X%X%X%X%X%X%X%X%X", + magic[0], magic[1], magic[2], magic[3], + magic[4], magic[5], magic[6], magic[7], + magic[8], magic[9], magic[10], magic[11], + magic[12], magic[13], magic[14], magic[15]); +} + +static +int check_magic(const uint8_t *magic) +{ + int i; + + for (i = 0; i < RB_CRASH_DUMP_ABI_MAGIC_LEN; i++) { + if ((magic[i] ^ 0xFF) != lttng_crash_expected_magic_xor[i]) { + return -1; + } + } + return 0; +} + +static +int get_crash_layout(struct lttng_crash_layout *layout, int fd, + const char *input_file) +{ + char *map; + int ret = 0, unmapret; + const uint8_t *magic; + uint64_t mmap_length; + uint16_t major, minor; + uint8_t word_size; + const struct crash_abi_unknown *abi; + uint16_t endian; + enum lttng_crash_type layout_type; + struct stat stat; + + ret = fstat(fd, &stat); + if (ret < 0) { + PERROR("Failed to fstat '%s'", input_file); + return -1; + } + if (stat.st_size < RB_CRASH_DUMP_ABI_LEN) { + ERR("File '%s' truncated: file length of %" PRIi64 + " bytes does not meet the minimal expected " + "length of %d bytes", + input_file, (int64_t) stat.st_size, + RB_CRASH_DUMP_ABI_LEN); + return -1; + } + map = (char *) mmap(NULL, RB_CRASH_DUMP_ABI_LEN, PROT_READ, MAP_PRIVATE, + fd, 0); + if (map == MAP_FAILED) { + PERROR("Mapping file"); + return -1; + } + abi = (const struct crash_abi_unknown *) map; + magic = crash_get_hdr_raw_field(layout, abi, magic); + print_dbg_magic(magic); + if (check_magic(magic)) { + DBG("Unknown magic number"); + ret = 1; /* positive return value, skip */ + goto end; + } + endian = crash_get_hdr_field(layout, abi, endian); + switch (endian) { + case RB_CRASH_ENDIAN: + break; + case RB_CRASH_ENDIAN_REVERSE: + layout->reverse_byte_order = 1; + break; + default: + DBG("Unknown endianness value: 0x%X", (unsigned int) endian); + ret = 1; /* positive return value, skip */ + goto end; + } + layout_type = (enum lttng_crash_type) crash_get_hdr_field(layout, abi, layout_type); + switch (layout_type) { + case LTTNG_CRASH_TYPE_UST: + break; + case LTTNG_CRASH_TYPE_KERNEL: + ERR("lttng-modules buffer layout support not implemented"); + ret = 1; /* positive return value, skip */ + goto end; + default: + ERR("Unknown layout type %u", (unsigned int) layout_type); + ret = 1; /* positive return value, skip */ + goto end; + } + mmap_length = crash_get_hdr_field(layout, abi, mmap_length); + DBG("mmap_length: %" PRIu64, mmap_length); + layout->mmap_length = mmap_length; + major = crash_get_hdr_field(layout, abi, major); + DBG("major: %u", major); + minor = crash_get_hdr_field(layout, abi, minor); + DBG("minor: %u", minor); + word_size = crash_get_hdr_field(layout, abi, word_size); + DBG("word_size: %u", word_size); + switch (major) { + case 0: + switch (minor) { + case 0: + ret = get_crash_layout_0_0(layout, map); + if (ret) + goto end; + break; + default: + ret = -1; + ERR("Unsupported crash ABI %u.%u\n", major, minor); + goto end; + } + break; + default: + ERR("Unsupported crash ABI %u.%u\n", major, minor); + ret = -1; + goto end; + } + layout->word_size = word_size; +end: + unmapret = munmap(map, RB_CRASH_DUMP_ABI_LEN); + if (unmapret) { + PERROR("munmap"); + } + return ret; +} + +/* buf_trunc mask selects only the buffer number. */ +static inline +uint64_t buf_trunc(uint64_t offset, uint64_t buf_size) +{ + return offset & ~(buf_size - 1); +} + +/* subbuf_trunc mask selects the subbuffer number. */ +static inline +uint64_t subbuf_trunc(uint64_t offset, uint64_t subbuf_size) +{ + return offset & ~(subbuf_size - 1); +} + +/* buf_offset mask selects only the offset within the current buffer. */ +static inline +uint64_t buf_offset(uint64_t offset, uint64_t buf_size) +{ + return offset & (buf_size - 1); +} + +/* subbuf_offset mask selects the offset within the current subbuffer. */ +static inline +uint64_t subbuf_offset(uint64_t offset, uint64_t subbuf_size) +{ + return offset & (subbuf_size - 1); +} + +/* subbuf_index returns the index of the current subbuffer within the buffer. */ +static inline +uint64_t subbuf_index(uint64_t offset, uint64_t buf_size, uint64_t subbuf_size) +{ + return buf_offset(offset, buf_size) / subbuf_size; +} + +static inline +uint64_t subbuffer_id_get_index(uint32_t mode, uint64_t id, + unsigned int wl) +{ + if (mode == RING_BUFFER_OVERWRITE) + return id & SB_ID_INDEX_MASK(wl); + else + return id; +} + +static +int copy_crash_subbuf(const struct lttng_crash_layout *layout, + int fd_dest, char *buf, uint64_t offset) +{ + uint64_t buf_size, subbuf_size, num_subbuf, sbidx, id, + sb_bindex, rpages_offset, p_offset, seq_cc, + committed, commit_count_mask, consumed_cur, + packet_size; + char *subbuf_ptr; + ssize_t writelen; + + /* + * Get the current subbuffer by applying the proper mask to + * "offset", and looking up the subbuf location within the + * source file buf. + */ + + buf_size = layout->buf_size; + subbuf_size = layout->subbuf_size; + num_subbuf = layout->num_subbuf; + + switch (layout->word_size) { + case 4: commit_count_mask = 0xFFFFFFFFULL / num_subbuf; + break; + case 8: commit_count_mask = 0xFFFFFFFFFFFFFFFFULL / num_subbuf; + break; + default: + ERR("Unsupported word size: %u", + (unsigned int) layout->word_size); + return -EINVAL; + } + + DBG("Copy crash subbuffer at offset %" PRIu64, offset); + sbidx = subbuf_index(offset, buf_size, subbuf_size); + + /* + * Find where the seq cc is located. Compute length of data to + * copy. + */ + seq_cc = crash_get_array_field(layout, buf, commit_hot_array, + sbidx, commit_hot_seq); + consumed_cur = crash_get_field(layout, buf, consumed_offset); + + /* + * Check that the buffer we are getting is after or at + * consumed_cur position. + */ + if ((long) subbuf_trunc(offset, subbuf_size) + - (long) subbuf_trunc(consumed_cur, subbuf_size) < 0) { + DBG("No data: position is before consumed_cur"); + goto nodata; + } + + /* + * Check if subbuffer has been fully committed. + */ + if (((seq_cc - subbuf_size) & commit_count_mask) + - (buf_trunc(offset, buf_size) / num_subbuf) + == 0) { + committed = subbuf_size; + } else { + committed = subbuf_offset(seq_cc, subbuf_size); + if (!committed) { + DBG("No data committed, seq_cc: %" PRIu64, seq_cc); + goto nodata; + } + } + + /* Find actual physical offset in subbuffer table */ + id = crash_get_array_field(layout, buf, buf_wsb_array, + sbidx, buf_wsb_id); + sb_bindex = subbuffer_id_get_index(layout->mode, id, + layout->word_size); + rpages_offset = crash_get_array_field(layout, buf, sb_array, + sb_bindex, sb_array_shmp_offset); + p_offset = crash_get_field(layout, buf + rpages_offset, + sb_backend_p_offset); + subbuf_ptr = buf + p_offset; + + if (committed == subbuf_size) { + /* + * Packet header can be used. + */ + if (layout->length.packet_size) { + memcpy(&packet_size, + subbuf_ptr + layout->offset.packet_size, + layout->length.packet_size); + if (layout->reverse_byte_order) { + packet_size = bswap_64(packet_size); + } + packet_size /= CHAR_BIT; + } else { + packet_size = subbuf_size; + } + } else { + uint64_t patch_size; + + /* + * Find where to patch the sub-buffer header with actual + * readable data len and packet len, derived from seq + * cc. Patch it in our in-memory copy. + */ + patch_size = committed * CHAR_BIT; + if (layout->reverse_byte_order) { + patch_size = bswap_64(patch_size); + } + if (layout->length.content_size) { + memcpy(subbuf_ptr + layout->offset.content_size, + &patch_size, layout->length.content_size); + } + if (layout->length.packet_size) { + memcpy(subbuf_ptr + layout->offset.packet_size, + &patch_size, layout->length.packet_size); + } + packet_size = committed; + } + + /* + * Copy packet into fd_dest. + */ + writelen = lttng_write(fd_dest, subbuf_ptr, packet_size); + if (writelen < packet_size) { + PERROR("Error writing to output file"); + return -1; + } + DBG("Copied %" PRIu64 " bytes of data", packet_size); + return 0; + +nodata: + return -ENODATA; +} + +static +int copy_crash_data(const struct lttng_crash_layout *layout, int fd_dest, + int fd_src) +{ + char *buf; + int ret = 0, has_data = 0; + struct stat statbuf; + size_t src_file_len; + uint64_t prod_offset, consumed_offset; + uint64_t offset, subbuf_size; + ssize_t readlen; + + ret = fstat(fd_src, &statbuf); + if (ret) { + return ret; + } + src_file_len = layout->mmap_length; + buf = (char *) zmalloc(src_file_len); + if (!buf) { + return -1; + } + readlen = lttng_read(fd_src, buf, src_file_len); + if (readlen < 0) { + PERROR("Error reading input file"); + ret = -1; + goto end; + } + + prod_offset = crash_get_field(layout, buf, prod_offset); + DBG("prod_offset: 0x%" PRIx64, prod_offset); + consumed_offset = crash_get_field(layout, buf, consumed_offset); + DBG("consumed_offset: 0x%" PRIx64, consumed_offset); + subbuf_size = layout->subbuf_size; + + for (offset = consumed_offset; offset < prod_offset; + offset += subbuf_size) { + ret = copy_crash_subbuf(layout, fd_dest, buf, offset); + if (!ret) { + has_data = 1; + } + if (ret) { + goto end; + } + } +end: + free(buf); + if (ret && ret != -ENODATA) { + return ret; + } + if (has_data) { + return 0; + } else { + return -ENODATA; + } +} + +static +int extract_file(int output_dir_fd, const char *output_file, + int input_dir_fd, const char *input_file) +{ + int fd_dest, fd_src, ret = 0, closeret; + struct lttng_crash_layout layout; + + layout.reverse_byte_order = 0; /* For reading magic number */ + + DBG("Extract file '%s'", input_file); + fd_src = openat(input_dir_fd, input_file, O_RDONLY); + if (fd_src < 0) { + PERROR("Error opening '%s' for reading", + input_file); + ret = -1; + goto end; + } + + /* Query the crash ABI layout */ + ret = get_crash_layout(&layout, fd_src, input_file); + if (ret) { + goto close_src; + } + + fd_dest = openat(output_dir_fd, output_file, + O_RDWR | O_CREAT | O_EXCL, + S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); + if (fd_dest < 0) { + PERROR("Error opening '%s' for writing", + output_file); + ret = -1; + goto close_src; + } + + ret = copy_crash_data(&layout, fd_dest, fd_src); + if (ret) { + goto close_dest; + } + +close_dest: + closeret = close(fd_dest); + if (closeret) { + PERROR("close"); + } + if (ret == -ENODATA) { + closeret = unlinkat(output_dir_fd, output_file, 0); + if (closeret) { + PERROR("unlinkat"); + } + } +close_src: + closeret = close(fd_src); + if (closeret) { + PERROR("close"); + } +end: + return ret; +} + +static +int extract_all_files(const char *output_path, + const char *input_path) +{ + DIR *input_dir, *output_dir; + int input_dir_fd, output_dir_fd, ret = 0, closeret; + struct dirent *entry; /* input */ + + /* Open input directory */ + input_dir = opendir(input_path); + if (!input_dir) { + PERROR("Cannot open '%s' path", input_path); + return -1; + } + input_dir_fd = dirfd(input_dir); + if (input_dir_fd < 0) { + PERROR("dirfd"); + return -1; + } + + /* Open output directory */ + output_dir = opendir(output_path); + if (!output_dir) { + PERROR("Cannot open '%s' path", output_path); + return -1; + } + output_dir_fd = dirfd(output_dir); + if (output_dir_fd < 0) { + PERROR("dirfd"); + return -1; + } + + while ((entry = readdir(input_dir))) { + if (!strcmp(entry->d_name, ".") + || !strcmp(entry->d_name, "..")) + continue; + ret = extract_file(output_dir_fd, entry->d_name, + input_dir_fd, entry->d_name); + if (ret == -ENODATA) { + DBG("No data in file '%s', skipping", entry->d_name); + ret = 0; + continue; + } else if (ret < 0) { + break; + } else if (ret > 0) { + DBG("Skipping file '%s'", entry->d_name); + ret = 0; + continue; + } + } + closeret = closedir(output_dir); + if (closeret) { + PERROR("closedir"); + } + closeret = closedir(input_dir); + if (closeret) { + PERROR("closedir"); + } + return ret; +} + +static +int extract_one_trace(const char *output_path, + const char *input_path) +{ + char dest[PATH_MAX], src[PATH_MAX]; + int ret; + + DBG("Extract crash trace '%s' into '%s'", input_path, output_path); + + /* Copy metadata */ + strncpy(dest, output_path, PATH_MAX); + dest[PATH_MAX - 1] = '\0'; + strncat(dest, "/metadata", PATH_MAX - strlen(dest) - 1); + + strncpy(src, input_path, PATH_MAX); + src[PATH_MAX - 1] = '\0'; + strncat(src, "/metadata", PATH_MAX - strlen(dest) - 1); + + ret = copy_file(dest, src); + if (ret) { + return ret; + } + + /* Extract each other file that has expected header */ + return extract_all_files(output_path, input_path); +} + +static +int extract_trace_recursive(const char *output_path, + const char *input_path) +{ + DIR *dir; + int dir_fd, ret = 0, closeret; + struct dirent *entry; + size_t path_len; + int has_warning = 0; + + /* Open directory */ + dir = opendir(input_path); + if (!dir) { + PERROR("Cannot open '%s' path", input_path); + return -1; + } + + path_len = strlen(input_path); + + dir_fd = dirfd(dir); + if (dir_fd < 0) { + PERROR("dirfd"); + return -1; + } + + while ((entry = readdir(dir))) { + struct stat st; + size_t name_len; + char filename[PATH_MAX]; + + if (!strcmp(entry->d_name, ".") + || !strcmp(entry->d_name, "..")) { + continue; + } + + name_len = strlen(entry->d_name); + if (path_len + name_len + 2 > sizeof(filename)) { + ERR("Failed to remove file: path name too long (%s/%s)", + input_path, entry->d_name); + continue; + } + + if (snprintf(filename, sizeof(filename), "%s/%s", + input_path, entry->d_name) < 0) { + ERR("Failed to format path."); + continue; + } + + if (stat(filename, &st)) { + PERROR("stat"); + continue; + } + + if (S_ISDIR(st.st_mode)) { + char output_subpath[PATH_MAX]; + char input_subpath[PATH_MAX]; + + strncpy(output_subpath, output_path, + sizeof(output_subpath)); + output_subpath[sizeof(output_subpath) - 1] = '\0'; + strncat(output_subpath, "/", + sizeof(output_subpath) - strlen(output_subpath) - 1); + strncat(output_subpath, entry->d_name, + sizeof(output_subpath) - strlen(output_subpath) - 1); + + ret = mkdir(output_subpath, S_IRWXU | S_IRWXG); + if (ret) { + PERROR("mkdir"); + has_warning = 1; + goto end; + } + + strncpy(input_subpath, input_path, + sizeof(input_subpath)); + input_subpath[sizeof(input_subpath) - 1] = '\0'; + strncat(input_subpath, "/", + sizeof(input_subpath) - strlen(input_subpath) - 1); + strncat(input_subpath, entry->d_name, + sizeof(input_subpath) - strlen(input_subpath) - 1); + + ret = extract_trace_recursive(output_subpath, + input_subpath); + if (ret) { + has_warning = 1; + } + } else if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) { + if (!strcmp(entry->d_name, "metadata")) { + ret = extract_one_trace(output_path, + input_path); + if (ret) { + WARN("Error extracting trace '%s', continuing anyway.", + input_path); + has_warning = 1; + } + } + } else { + has_warning = 1; + goto end; + } + } +end: + closeret = closedir(dir); + if (closeret) { + PERROR("closedir"); + } + return has_warning; +} + +static +int delete_dir_recursive(const char *path) +{ + DIR *dir; + int dir_fd, ret = 0, closeret; + size_t path_len; + struct dirent *entry; + + /* Open trace directory */ + dir = opendir(path); + if (!dir) { + PERROR("Cannot open '%s' path", path); + ret = -errno; + goto end_no_closedir; + } + + path_len = strlen(path); + + dir_fd = dirfd(dir); + if (dir_fd < 0) { + PERROR("dirfd"); + ret = -errno; + goto end; + } + + while ((entry = readdir(dir))) { + struct stat st; + size_t name_len; + char filename[PATH_MAX]; + + if (!strcmp(entry->d_name, ".") + || !strcmp(entry->d_name, "..")) { + continue; + } + + name_len = strlen(entry->d_name); + if (path_len + name_len + 2 > sizeof(filename)) { + ERR("Failed to remove file: path name too long (%s/%s)", + path, entry->d_name); + continue; + } + + if (snprintf(filename, sizeof(filename), "%s/%s", + path, entry->d_name) < 0) { + ERR("Failed to format path."); + continue; + } + + if (stat(filename, &st)) { + PERROR("stat"); + continue; + } + + if (S_ISDIR(st.st_mode)) { + char *subpath = (char *) zmalloc(PATH_MAX); + + if (!subpath) { + PERROR("zmalloc path"); + ret = -1; + goto end; + } + strncpy(subpath, path, PATH_MAX); + subpath[PATH_MAX - 1] = '\0'; + strncat(subpath, "/", + PATH_MAX - strlen(subpath) - 1); + strncat(subpath, entry->d_name, + PATH_MAX - strlen(subpath) - 1); + + ret = delete_dir_recursive(subpath); + free(subpath); + if (ret) { + /* Error occurred, abort traversal. */ + goto end; + } + } else if (S_ISREG(st.st_mode)) { + ret = unlinkat(dir_fd, entry->d_name, 0); + if (ret) { + PERROR("Unlinking '%s'", entry->d_name); + goto end; + } + } else { + ret = -EINVAL; + goto end; + } + } +end: + if (!ret) { + ret = rmdir(path); + if (ret) { + PERROR("rmdir '%s'", path); + } + } + closeret = closedir(dir); + if (closeret) { + PERROR("closedir"); + } +end_no_closedir: + return ret; +} + +static +int view_trace(const char *trace_path, char *viewer_path) +{ + pid_t pid; + + pid = fork(); + if (pid < 0) { + /* Error */ + PERROR("fork"); + return -1; + } else if (pid > 0) { + /* Parent */ + int status; + + pid = waitpid(pid, &status, 0); + if (pid < 0 || !WIFEXITED(status)) { + return -1; + } + } else { + /* Child */ + int ret; + + ret = spawn_viewer(trace_path, viewer_path, false); + if (ret) { + exit(EXIT_FAILURE); + } + /* Never reached */ + exit(EXIT_SUCCESS); + } + return 0; +} + +/* + * main + */ +int main(int argc, char *argv[]) +{ + int ret; + bool has_warning = false; + const char *output_path = NULL; + char tmppath[] = "/tmp/lttng-crash-XXXXXX"; + + progname = argv[0] ? argv[0] : "lttng-crash"; + + ret = parse_args(argc, argv); + if (ret > 0) { + goto end; + } else if (ret < 0) { + has_warning = true; + goto end; + } + + if (opt_output_path) { + output_path = opt_output_path; + ret = mkdir(output_path, S_IRWXU | S_IRWXG); + if (ret) { + PERROR("mkdir"); + has_warning = true; + goto end; + } + } else { + output_path = mkdtemp(tmppath); + if (!output_path) { + PERROR("mkdtemp"); + has_warning = true; + goto end; + } + } + + ret = extract_trace_recursive(output_path, the_input_path); + if (ret < 0) { + has_warning = true; + goto end; + } else if (ret > 0) { + /* extract_trace_recursive reported a warning. */ + has_warning = true; + } + if (!opt_output_path) { + /* View trace */ + ret = view_trace(output_path, opt_viewer_path); + if (ret) { + has_warning = true; + } + /* unlink temporary trace */ + ret = delete_dir_recursive(output_path); + if (ret) { + has_warning = true; + } + } +end: + exit(has_warning ? EXIT_FAILURE : EXIT_SUCCESS); +}