diff options
Diffstat (limited to 'pcap.c')
| -rw-r--r-- | pcap.c | 194 |
1 files changed, 193 insertions, 1 deletions
@@ -33,7 +33,7 @@ #ifndef lint static const char rcsid[] = - "@(#) $Header: /tcpdump/master/libpcap/pcap.c,v 1.41 2002-08-02 03:44:21 guy Exp $ (LBL)"; + "@(#) $Header: /tcpdump/master/libpcap/pcap.c,v 1.42 2002-12-19 09:05:48 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H @@ -129,6 +129,196 @@ pcap_datalink(pcap_t *p) } int +pcap_list_datalinks(pcap_t *p, int **dlt_buffer) +{ + if (p->dlt_count == 0) { + /* + * We couldn't fetch the list of DLTs, which means + * this platform doesn't support changing the + * DLT for an interface. Return a list of DLTs + * containing only the DLT this device supports. + */ + *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer)); + if (*dlt_buffer == NULL) { + (void)snprintf(p->errbuf, sizeof(p->errbuf), + "malloc: %s", pcap_strerror(errno)); + return (-1); + } + **dlt_buffer = p->linktype; + return (1); + } else { + *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer) * p->dlt_count); + if (*dlt_buffer == NULL) { + (void)snprintf(p->errbuf, sizeof(p->errbuf), + "malloc: %s", pcap_strerror(errno)); + return (-1); + } + (void)memcpy(*dlt_buffer, p->dlt_list, + sizeof(**dlt_buffer) * p->dlt_count); + return (p->dlt_count); + } +} + +int +pcap_set_datalink(pcap_t *p, int dlt) +{ + int i; + const char *dlt_name; + + if (p->dlt_count == 0) { + /* + * We couldn't fetch the list of DLTs, which means + * this platform doesn't support changing the + * DLT for an interface. Check whether the new + * DLT is the one this interface supports. + */ + if (p->linktype != dlt) + goto unsupported; + + /* + * It is, so there's nothing we need to do here. + */ + return (0); + } + for (i = 0; i < p->dlt_count; i++) + if (p->dlt_list[i] == dlt) + break; + if (i >= p->dlt_count) + goto unsupported; + if (pcap_set_datalink_platform(p, dlt) == -1) + return (-1); + p->linktype = dlt; + return (0); + +unsupported: + dlt_name = pcap_datalink_val_to_name(dlt); + if (dlt_name != NULL) { + (void) snprintf(p->errbuf, sizeof(p->errbuf), + "%s is not one of the DLTs supported by this device", + dlt_name); + } else { + (void) snprintf(p->errbuf, sizeof(p->errbuf), + "DLT %d is not one of the DLTs supported by this device", + dlt); + } + return (-1); +} + +struct dlt_choice { + const char *name; + int dlt; +}; + +#define DLT_CHOICE(code) { #code, code } +#define DLT_CHOICE_SENTINEL { NULL, 0 } + +static struct dlt_choice dlt_choices[] = { + DLT_CHOICE(DLT_ARCNET), + DLT_CHOICE(DLT_EN10MB), + DLT_CHOICE(DLT_SLIP), + DLT_CHOICE(DLT_SLIP_BSDOS), + DLT_CHOICE(DLT_NULL), + DLT_CHOICE(DLT_LOOP), + DLT_CHOICE(DLT_PPP), + DLT_CHOICE(DLT_C_HDLC), + DLT_CHOICE(DLT_PPP_SERIAL), + DLT_CHOICE(DLT_PPP_ETHER), + DLT_CHOICE(DLT_PPP_BSDOS), + DLT_CHOICE(DLT_FDDI), + DLT_CHOICE(DLT_IEEE802), + DLT_CHOICE(DLT_IEEE802_11), + DLT_CHOICE(DLT_PRISM_HEADER), + DLT_CHOICE(DLT_IEEE802_11_RADIO), + DLT_CHOICE(DLT_ATM_RFC1483), + DLT_CHOICE(DLT_ATM_CLIP), + DLT_CHOICE(DLT_SUNATM), + DLT_CHOICE(DLT_RAW), + DLT_CHOICE(DLT_LINUX_SLL), + DLT_CHOICE(DLT_LTALK), + DLT_CHOICE(DLT_IP_OVER_FC), + DLT_CHOICE(DLT_FRELAY), + DLT_CHOICE_SENTINEL +}; + +/* + * This array is designed for mapping upper and lower case letter + * together for a case independent comparison. The mappings are + * based upon ascii character sequences. + */ +static const u_char charmap[] = { + '\000', '\001', '\002', '\003', '\004', '\005', '\006', '\007', + '\010', '\011', '\012', '\013', '\014', '\015', '\016', '\017', + '\020', '\021', '\022', '\023', '\024', '\025', '\026', '\027', + '\030', '\031', '\032', '\033', '\034', '\035', '\036', '\037', + '\040', '\041', '\042', '\043', '\044', '\045', '\046', '\047', + '\050', '\051', '\052', '\053', '\054', '\055', '\056', '\057', + '\060', '\061', '\062', '\063', '\064', '\065', '\066', '\067', + '\070', '\071', '\072', '\073', '\074', '\075', '\076', '\077', + '\100', '\141', '\142', '\143', '\144', '\145', '\146', '\147', + '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', + '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', + '\170', '\171', '\172', '\133', '\134', '\135', '\136', '\137', + '\140', '\141', '\142', '\143', '\144', '\145', '\146', '\147', + '\150', '\151', '\152', '\153', '\154', '\155', '\156', '\157', + '\160', '\161', '\162', '\163', '\164', '\165', '\166', '\167', + '\170', '\171', '\172', '\173', '\174', '\175', '\176', '\177', + '\200', '\201', '\202', '\203', '\204', '\205', '\206', '\207', + '\210', '\211', '\212', '\213', '\214', '\215', '\216', '\217', + '\220', '\221', '\222', '\223', '\224', '\225', '\226', '\227', + '\230', '\231', '\232', '\233', '\234', '\235', '\236', '\237', + '\240', '\241', '\242', '\243', '\244', '\245', '\246', '\247', + '\250', '\251', '\252', '\253', '\254', '\255', '\256', '\257', + '\260', '\261', '\262', '\263', '\264', '\265', '\266', '\267', + '\270', '\271', '\272', '\273', '\274', '\275', '\276', '\277', + '\300', '\341', '\342', '\343', '\344', '\345', '\346', '\347', + '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', + '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', + '\370', '\371', '\372', '\333', '\334', '\335', '\336', '\337', + '\340', '\341', '\342', '\343', '\344', '\345', '\346', '\347', + '\350', '\351', '\352', '\353', '\354', '\355', '\356', '\357', + '\360', '\361', '\362', '\363', '\364', '\365', '\366', '\367', + '\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377', +}; + +static int +pcap_strcasecmp(const char *s1, const char *s2) +{ + register const u_char *cm = charmap, + *us1 = (u_char *)s1, + *us2 = (u_char *)s2; + + while (cm[*us1] == cm[*us2++]) + if (*us1++ == '\0') + return(0); + return (cm[*us1] - cm[*--us2]); +} + +int +pcap_datalink_name_to_val(const char *name) +{ + int i; + + for (i = 0; dlt_choices[i].name != NULL; i++) { + if (pcap_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1, + name) == 0) + return (dlt_choices[i].dlt); + } + return (-1); +} + +const char * +pcap_datalink_val_to_name(int dlt) +{ + int i; + + for (i = 0; dlt_choices[i].name != NULL; i++) { + if (dlt_choices[i].dlt == dlt) + return (dlt_choices[i].name + sizeof("DLT_") - 1); + } + return (NULL); +} + +int pcap_snapshot(pcap_t *p) { return (p->snapshot); @@ -226,6 +416,8 @@ pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf) #else int newtimeout; #endif + if (p->dlt_list != NULL) + free(p->dlt_list); if (p->sf.rfile != NULL) { /* |